mirror of
https://github.com/moparisthebest/Simba
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577 lines
16 KiB
ObjectPascal
577 lines
16 KiB
ObjectPascal
unit ocrutil;
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{$mode objfpc}{$H+}
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interface
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uses
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Classes, SysUtils, MufasaTypes,bitmaps;
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type
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TNormArray = array of integer;
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TocrGlyphMask = record
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ascii: char;
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width,height: integer;
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l,r,t,b: integer;
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mask: TNormArray;
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end;
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TocrGlyphMaskArray = array of TocrGlyphMask;
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TocrGlyphMetric = record
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xoff,yoff: integer;
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width,height: integer;
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index: integer; //stores the internal TocrData index for this char
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end;
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TocrData = record
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ascii: array[0..255] of TocrGlyphMetric;
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pos: array of array of integer;
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pos_adj: array of real;
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neg: array of array of integer;
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neg_adj: array of real;
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map: array of char;
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width,height, max_width, max_height: integer;
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inputs,outputs: integer;
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end;
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TocrDataArray = array of TocrData;
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tLab = record
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L,a,b: real;
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end;
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procedure findBounds(glyphs: TocrGlyphMaskArray; out width,height,maxwidth,maxheight: integer);
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function LoadGlyphMask(const bmp : TMufasaBitmap; shadow: boolean; const ascii : char): TocrGlyphMask;
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function LoadGlyphMasks(const path: string; shadow: boolean): TocrGlyphMaskArray;
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function InitOCR(const Masks : TocrGlyphMaskArray): TocrData;
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function GuessGlyph(glyph: TNormArray; ocrdata: TocrData): char;
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function PointsToNorm(points: TpointArray; out w,h: integer): TNormArray;
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function ImageToNorm(src: TRGB32Array; w,h: integer): TNormArray;
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function ocrDetect(txt: TNormArray; w,h: integer; var ocrdata: TocrData): string;
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function ExtractText(colors: PRGB32;{colors: tRGBArray;} w,h: integer): TNormArray;
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implementation
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uses
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math,
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{Begin To-Remove units. Replace ReadBmp with TMufasaBitmap stuff later.}
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graphtype, intfgraphics,graphics;
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{End To-Remove unit}
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{initalizes the remaining fields from a TocrGlyphMask and finds the global bounds}
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procedure findBounds(glyphs: TocrGlyphMaskArray; out width,height,maxwidth,maxheight: integer);
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var
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i,x,y,c,w,h: integer;
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minx,miny,maxx,maxy : integer;
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l,r,t,b: integer;
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dat: TNormArray;
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begin
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width:= 0;
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height:= 0;
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MaxWidth := 0;
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MaxHeight := 0;
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minx := 9000;
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miny := 9000;
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maxx := 0;
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maxy := 0;
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for c:= 0 to length(glyphs) - 1 do
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begin
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dat:= glyphs[c].mask;
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w:= glyphs[c].width;
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h:= glyphs[c].height;
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l:= w;
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r:= 0;
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t:= h;
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b:= 0;
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for i:= 0 to w*h-1 do
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begin
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if dat[i] = 1 then
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begin
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x:= i mod w;
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y:= i div w;
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if x > maxx then maxx := x;
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if x < minx then minx := x;
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if x > r then r:= x;
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if x < l then l:= x;
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if y > maxy then maxy := y;
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if y < miny then miny := y;
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if y > b then b:= y;
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if y < t then t:= y;
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end;
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end;
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if l = w then l:= 0;
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if t = h then t:= 0;
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glyphs[c].r:= r;
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glyphs[c].l:= l;
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glyphs[c].b:= b;
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glyphs[c].t:= t;
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if (r - l + 1) > width then width:= r - l + 1;
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if (b - t + 1) > height then height:= b - t + 1;
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end;
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maxwidth:= (maxx-minx) + 1;
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maxheight := (maxy - miny) + 1;
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end;
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{Use whatever you want if you don't like this}
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function GetFiles(Path, Ext: string): TstringArray;
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var
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SearchRec : TSearchRec;
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c : integer;
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begin
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c := 0;
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if FindFirst(Path + '*.' + ext, faAnyFile, SearchRec) = 0 then
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begin
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repeat
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inc(c);
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SetLength(Result,c);
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Result[c-1] := SearchRec.Name;
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until FindNext(SearchRec) <> 0;
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SysUtils.FindClose(SearchRec);
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end;
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end;
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function LoadGlyphMask(const bmp: TMufasaBitmap; shadow: boolean; const ascii : char): TocrGlyphMask;
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var
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size,j: integer;
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color: TRGB32;
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shadow_i: byte;
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begin
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if shadow then
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shadow_i := 0
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else
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shadow_i := 255;
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size:= bmp.Width * bmp.Height;
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SetLength(result.mask,size);
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for j := 0 to size-1 do
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begin
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color := bmp.FData[j];
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{ if (color.r = 255) and (color.g = 255 and not shadow_i) and
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(color.b = 255 and not shadow_i) then}
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if (color.r = 255) and (color.g = shadow_i) and (color.b = shadow_i) then
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result.mask[j]:= 1
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else
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result.mask[j]:= 0;
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end;
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result.width:= bmp.width;
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result.height:= bmp.height;
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result.ascii:= ascii;
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end;
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{This Loads the actual data from the .bmp, but does not init all fields}
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function LoadGlyphMasks(const path: string; shadow: boolean): TocrGlyphMaskArray;
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var
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strs: array of string;
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bmp : TMufasaBitmap;
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len,i: integer;
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begin
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strs:= GetFiles(path,'bmp');
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len:= length(strs);
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SetLength(result,len);
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bmp := TMufasaBitmap.Create;
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for i:= 0 to len-1 do
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begin
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bmp.LoadFromFile(path + strs[i]);
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SetLength(strs[i],Length(strs[i])-4);
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Result[i] := LoadGlyphMask(bmp,shadow,chr(strtoint(strs[i])));
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end;
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Bmp.free;
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end;
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{Fully initalizes a TocrData structure, this is LoadFont or whatever, call it first}
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function InitOCR(const masks : TocrGlyphMaskArray): TocrData;
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var
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t,b,l,r,w,h,mw: integer;
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x,y: integer;
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maxw,maxh : integer;
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c,i,len,size: integer;
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pos: integer;
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ascii: char;
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begin
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w:= 0;
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h:= 0;
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findBounds(masks,w,h,maxw,maxh);
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len:= Length(masks);
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result.width:= w;
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result.height:= h;
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result.max_width := maxw;
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result.max_height := maxh;
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size:= w * h;
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SetLength(result.pos,len,size);
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SetLength(result.pos_adj,len);
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SetLength(result.neg,len,size);
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SetLength(result.neg_adj,len);
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SetLength(result.map,len);
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for i:= 0 to len - 1 do
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begin
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ascii:= masks[i].ascii;
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pos:= 0;
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l:= masks[i].l;
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r:= masks[i].r;
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b:= masks[i].b;
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t:= masks[i].t;
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mw:= masks[i].width;
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for y:= t to b do
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begin
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for x:= l to r do
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begin
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c:= (x-l) + (y-t)*w;
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if masks[i].mask[x+y*mw] <> 0 then
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begin
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result.pos[i][c]:= 1;
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inc(pos);
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end else
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result.pos[i][c] := 0;
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end;
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end;
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for c:= 0 to size-1 do
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result.neg[i][c]:= 1 - result.pos[i][c];
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if pos = 0 then result.neg_adj[i]:= 1 else result.neg_adj[i]:= 1 / pos;
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if pos = 0 then result.pos_adj[i]:= 0 else result.pos_adj[i]:= 1 / pos;
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result.map[i]:= ascii;
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result.ascii[ord(ascii)].index:= i;
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result.ascii[ord(ascii)].xoff:= masks[i].l;
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result.ascii[ord(ascii)].yoff:= masks[i].t;
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result.ascii[ord(ascii)].width:= masks[i].width;
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result.ascii[ord(ascii)].height:= masks[i].height;
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end;
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result.inputs:= size;
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result.outputs:= len;
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end;
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{guesses a glyph stored in glyph (which is an 1-0 image of the size specified by width and height in ocrdata}
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function GuessGlyph(glyph: TNormArray; ocrdata: TocrData): char;
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var
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i,c,inputs,outputs,val: integer;
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pos_weights: array of real;
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neg_weights: array of real;
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max, weight: real;
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begin
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SetLength(pos_weights,ocrdata.outputs);
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SetLength(neg_weights,ocrdata.outputs);
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inputs:= ocrdata.inputs - 1;
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outputs:= ocrdata.outputs - 1;
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for i:= 0 to inputs do
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begin
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val:= glyph[i];
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for c:= 0 to outputs do
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begin
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pos_weights[c]:= pos_weights[c] + ocrdata.pos[c][i] * val;
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neg_weights[c]:= neg_weights[c] + ocrdata.neg[c][i] * val;
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end
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end;
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max:= 0;
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for i:= 0 to outputs do
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begin
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weight:= pos_weights[i] * ocrdata.pos_adj[i] - neg_weights[i] * ocrdata.neg_adj[i];
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if (weight > max) then
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begin
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max:= weight;
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result:= ocrdata.map[i];
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end;
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end;
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end;
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{converts a TPA into a 1-0 image of the smallest possible size}
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function PointsToNorm(points: TpointArray; out w,h: integer): TNormArray;
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var
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l,r,t,b: integer;
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i,len,size: integer;
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norm: TNormArray;
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begin
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len:= length(points);
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l:= points[0].x;
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r:= points[0].x;
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t:= points[0].y;
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b:= points[0].y;
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for i:= 1 to len-1 do
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begin
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if points[i].x < l then l:= points[i].x;
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if points[i].x > r then r:= points[i].x;
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if points[i].y < t then t:= points[i].y;
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if points[i].y > b then b:= points[i].y;
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end;
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w:= r - l + 1;
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h:= b - t + 1;
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size:= w * h;
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SetLength(norm,size);
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for i:= 0 to len-1 do
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norm[(points[i].x - l) + (points[i].y - t) * w]:= 1;
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result:= norm;
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end;
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function ImageToNorm(src: TRGB32Array; w,h: integer): TNormArray;
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var
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norm: TNormArray;
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i: integer;
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begin
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SetLength(norm,w*h);
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for i:= 0 to w*h-1 do
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if (src[i].r = 255) and (src[i].g = 255) and (src[i].b = 255) then
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norm[i]:= 1 else norm[i]:= 0;
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result:= norm;
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end;
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{takes a mask of only one line of text, a TocrData, and returns the string in it}
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function ocrDetect(txt: TNormArray; w,h: integer; var ocrdata: TocrData): string;
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var
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l,r,t,b,x,y,xx,yy: integer;
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upper,left,last,spaces: integer;
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glyph: TNormArray;
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empty: boolean;
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ascii: char;
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begin
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result:= '';
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l:= -1;
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r:= -1;
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upper:= -9001; //large negative
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left:= -9001; //large negative
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x:= 0;
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while x < w do
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begin
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empty:= true;
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for y:= 0 to h-1 do
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begin
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if txt[x+y*w] = 1 then
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begin
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empty:= false;
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break;
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end;
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end;
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if (l = -1) and (not empty) then
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begin
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l:= x
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end else if (l <> -1) then
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begin
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if empty then
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r:= x - 1
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else if x = w-1 then
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r:= x;
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end;
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if (r <> -1) and (l <> -1) then
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begin
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t:= -1;
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b:= -1;
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SetLength(glyph,0);
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SetLength(glyph,ocrdata.width*ocrdata.height);
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for yy:= 0 to h-1 do
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begin
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for xx:= l to r do
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if txt[xx+yy*w] = 1 then begin t:= yy; break; end;
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if t <> -1 then break;
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end;
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for yy:= h-1 downto 0 do
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begin
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for xx:= l to r do
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if txt[xx+yy*w] = 1 then begin b:= yy; break; end;
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if b <> -1 then break;
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end;
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if b - t + 1 > ocrdata.height then b:= b - (b-t+1-ocrdata.height);
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if r - l + 1 > ocrdata.width then r:= r - (r-l+1-ocrdata.width);
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for yy:= t to b do
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for xx:= l to r do
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glyph[(xx-l) + (yy-t)*ocrdata.width]:= txt[xx+yy*w];
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ascii:= GuessGlyph(glyph,ocrdata);
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if (upper = -9001) or (left = -9001) then
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begin
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upper:= t - ocrdata.ascii[ord(ascii)].yoff;
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left:= l - ocrdata.ascii[ord(ascii)].xoff + ocrdata.ascii[ord(ascii)].width;
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x:= left;
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end else
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begin
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last:= left;
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left:= l - ocrdata.ascii[ord(ascii)].xoff;
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if last <> left then
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begin
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for spaces:= 1 to (left - last) div ocrdata.ascii[32].width do
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result:= result + ' ';
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end;
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left:= left + ocrdata.ascii[ord(ascii)].width;
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x:= left;
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end;
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result:= result + ascii;
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l:= -1;
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r:= -1;
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end;
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inc(x);
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end;
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end;
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function AvgColors(color1:TRGB32; weight1: integer; color2: TRGB32; weight2: integer): TRGB32;
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begin
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result.r:= (color1.r * weight1 + color2.r * weight2) div (weight1 + weight2);
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result.g:= (color1.g * weight1 + color2.g * weight2) div (weight1 + weight2);
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result.b:= (color1.b * weight1 + color2.b * weight2) div (weight1 + weight2);
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end;
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procedure RGBtoXYZ(color: TRGB32; out X, Y, Z: real); inline;
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var
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nr,ng,nb: real;
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begin
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nr:= color.r / 255.0;
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ng:= color.g / 255.0;
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nb:= color.b / 255.0;
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if nr <= 0.04045 then nr:= nr / 12.92 else nr:= power((nr + 0.055)/1.055,2.4);
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if ng <= 0.04045 then ng:= ng / 12.92 else ng:= power((ng + 0.055)/1.055,2.4);
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if nb <= 0.04045 then nr:= nb / 12.92 else nb:= power((nb + 0.055)/1.055,2.4);
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X:= 0.4124*nr + 0.3576*ng + 0.1805*nb;
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Y:= 0.2126*nr + 0.7152*ng + 0.0722*nb;
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Z:= 0.0193*nr + 0.1192*ng + 0.9505*nb;
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end;
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function labmod(i: real): real; inline;
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begin
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if i > power(0.206896552,3) then
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result:= power(i,0.333333333)
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else
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result:= 7.787037037*i + 0.137931034;
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end;
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function ColortoLab(c: TRGB32): tLab; inline;
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var
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X,Y,Z,sum,Xn,Yn,Zn: real;
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begin
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RGBtoXYZ(c,X,Y,Z);
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sum:= X + Y + Z;
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if(sum = 0) then
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begin
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result.l := 0.0;
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result.a := 0.0;
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result.b := 0.0;
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end;
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Xn:= X / sum;
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Yn:= Y / sum;
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Zn:= Z / sum;
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result.L:= 116.0*labmod(y/yn) - 16.0;
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result.a:= 500.0*(labmod(x/xn)-labmod(y/yn));
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result.b:= 500.0*(labmod(y/yn)-labmod(z/zn));
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end;
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function colorDistSqr(a,b:TRGB32): integer; inline;
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begin
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result:= (a.r-b.r)*(a.r-b.r)+(a.b-b.b)*(a.b-b.b)+(a.g-b.g)*(a.g-b.g);
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end;
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function ExtractText(colors: PRGB32;{colors: tRGBArray;} w,h: integer): TNormArray;
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const
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GradientMax = 2.0;
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white: TRGB32= ( b: $FF; g: $FF; r: $FF; a: $00 );
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cyan: TRGB32= ( b: $FF; g: $FF; r: $00; a: $00 );
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yellow: TRGB32= ( b: $00; g: $EF; r: $FF; a: $00 );
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red: TRGB32= ( b: $00; g: $00; r: $FF; a: $00 );
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green: TRGB32= ( b: $00; g: $FF; r: $00; a: $00 );
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var
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up, left: boolean;
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len,numblobs,thisblob,lastblob,i,j,used: integer;
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blobbed,blobcount,stack: array of integer;
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labs: array of tLab;
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a,b: tLab;
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blobcolor: TRGB32Array;
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newcolors: array of integer;
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c: TRGB32;
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norm: TNormArray;
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begin
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len:= w*h;
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SetLength(blobbed,len);
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SetLength(blobcount,len);
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SetLength(blobcolor,len);
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SetLength(stack,len);
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SetLength(labs,len);
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for i:= 0 to len-1 do
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labs[i]:= ColorToLab( TRGB32(colors[i]));
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numblobs:= 0;
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for i:= 0 to len-1 do
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begin
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a:= labs[i];
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if i >= w then
|
|
begin
|
|
b:= labs[i-w];
|
|
up:= abs(a.L-b.L)+abs(a.a-b.a)+abs(a.b-b.b) <= GradientMax;
|
|
end else
|
|
up:= false;
|
|
if i mod w <> 0 then
|
|
begin
|
|
b:= labs[i-1];
|
|
left:= abs(a.L-b.L)+abs(a.a-b.a)+abs(a.b-b.b) <= GradientMax;
|
|
end else
|
|
left:= false;
|
|
if left and up then
|
|
begin
|
|
thisblob:= blobbed[i-w];
|
|
blobbed[i]:= thisblob;
|
|
blobcolor[thisblob]:= AvgColors(blobcolor[thisblob],blobcount[thisblob],tRGB32(colors[i]),1);
|
|
blobcount[thisblob]:= blobcount[thisblob] + 1;
|
|
lastblob:= blobbed[i-1];
|
|
if lastblob <> thisblob then
|
|
begin
|
|
used:= 1;
|
|
stack[0]:= i-1;
|
|
while used > 0 do
|
|
begin
|
|
used:= used - 1;
|
|
j:= stack[used];
|
|
if blobbed[j] = lastblob then
|
|
begin
|
|
blobbed[j]:= thisblob;
|
|
if j >= w then if blobbed[j-w] = lastblob then begin stack[used]:= j-w; used:= used + 1; end;
|
|
if j mod w <> 0 then if blobbed[j-1] = lastblob then begin stack[used]:= j-1; used:= used + 1; end;
|
|
if (j+1) mod w <> 0 then if blobbed[j+1] = lastblob then begin stack[used]:= j+1; used:= used + 1; end;
|
|
if j < w*h-w then if blobbed[j+w] = lastblob then begin stack[used]:= j+w; used:= used + 1; end;
|
|
end;
|
|
end;
|
|
blobcolor[thisblob]:= AvgColors(blobcolor[thisblob],blobcount[thisblob],blobcolor[lastblob],blobcount[lastblob]);
|
|
blobcount[thisblob]:= blobcount[thisblob] + blobcount[lastblob];
|
|
blobcount[lastblob]:= 0;
|
|
end;
|
|
end else if left then
|
|
begin
|
|
thisblob:= blobbed[i-1];
|
|
blobbed[i]:= thisblob;
|
|
blobcolor[thisblob]:= AvgColors(blobcolor[thisblob],blobcount[thisblob],tRGB32(colors[i]),1);
|
|
blobcount[thisblob]:= blobcount[thisblob] + 1;
|
|
end else if up then
|
|
begin
|
|
thisblob:= blobbed[i-w];
|
|
blobbed[i]:= thisblob;
|
|
blobcolor[thisblob]:= AvgColors(blobcolor[thisblob],blobcount[thisblob],tRGB32(colors[i]),1);
|
|
blobcount[thisblob]:= blobcount[thisblob] + 1;
|
|
end else
|
|
begin
|
|
blobbed[i]:= numblobs;
|
|
blobcount[numblobs]:= 1;
|
|
blobcolor[numblobs]:= tRGB32(colors[i]);
|
|
numblobs:= numblobs + 1;
|
|
end;
|
|
end;
|
|
SetLength(blobcount,numblobs);
|
|
SetLength(blobcolor,numblobs);
|
|
//Done blobfinding, extract char masks
|
|
SetLength(newcolors,numblobs);
|
|
for i:= 0 to numblobs-1 do
|
|
begin
|
|
j:= blobcount[i];
|
|
if j > 0 then
|
|
begin
|
|
c:= blobcolor[i];
|
|
if (j > 50) or (j < 2) then
|
|
newcolors[i]:= 0
|
|
else if colorDistSqr(white,c) <= 10000 then
|
|
newcolors[i]:= 1
|
|
else if colorDistSqr(cyan,c) <= 10000 then
|
|
newcolors[i]:= 1
|
|
else if colorDistSqr(yellow,c) <= 10000 then
|
|
newcolors[i]:= 1
|
|
else if colorDistSqr(red,c) <= 10000 then
|
|
newcolors[i]:= 1
|
|
else if colorDistSqr(green,c) <= 10000 then
|
|
newcolors[i]:= 1
|
|
else
|
|
newcolors[i]:= 0;
|
|
end;
|
|
end;
|
|
SetLength(norm,len);
|
|
for i:= 0 to len-1 do
|
|
norm[i]:= newcolors[blobbed[i]];
|
|
result:= norm;
|
|
end;
|
|
|
|
end.
|
|
|