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Simba/Units/MMLCore/ocrutil.pas

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