Pix Pix::ThresholdToValue(int threshval, int setval)
{
if(IsEmpty())
return Pix();
PIX *dPix = pixThresholdToValue(NULL, pix, threshval, setval);
if(!dPix)
return Pix();
return Pix(&dPix);
} // END Pix::ThresholdToValue()
int main(int argc,
char **argv) {
char *filein;
l_float32 angle, conf, deg2rad;
PIX *pixs, *pix1, *pix2, *pix3, *pix4, *pix5;
PIX *pix6, *pix7, *pix8, *pix9;
static char mainName[] = "lineremoval";
if (argc != 2)
return ERROR_INT(" Syntax: lineremoval filein", mainName, 1);
filein = argv[1];
deg2rad = 3.14159 / 180.;
if ((pixs = pixRead(filein)) == NULL)
return ERROR_INT("pix not made", mainName, 1);
/* threshold to binary, extracting much of the lines */
pix1 = pixThresholdToBinary(pixs, 170);
pixWrite("/tmp/dave-proc1.png", pix1, IFF_PNG);
pixDisplayWrite(pix1, 1);
/* find the skew angle and deskew using an interpolated
* rotator for anti-aliasing (to avoid jaggies) */
pixFindSkew(pix1, &angle, &conf);
pix2 = pixRotateAMGray(pixs, deg2rad * angle, 255);
pixWrite("/tmp/dave-proc2.png", pix2, IFF_PNG);
pixDisplayWrite(pix2, 1);
/* extract the lines to be removed */
pix3 = pixCloseGray(pix2, 51, 1);
pixWrite("/tmp/dave-proc3.png", pix3, IFF_PNG);
pixDisplayWrite(pix3, 1);
/* solidify the lines to be removed */
pix4 = pixErodeGray(pix3, 1, 5);
pixWrite("/tmp/dave-proc4.png", pix4, IFF_PNG);
pixDisplayWrite(pix4, 1);
/* clean the background of those lines */
pix5 = pixThresholdToValue(NULL, pix4, 210, 255);
pixWrite("/tmp/dave-proc5.png", pix5, IFF_PNG);
pixDisplayWrite(pix5, 1);
pix6 = pixThresholdToValue(NULL, pix5, 200, 0);
pixWrite("/tmp/dave-proc6.png", pix6, IFF_PNG);
pixDisplayWrite(pix6, 1);
/* get paint-through mask for changed pixels */
pix7 = pixThresholdToBinary(pix6, 210);
pixWrite("/tmp/dave-proc7.png", pix7, IFF_PNG);
pixDisplayWrite(pix7, 1);
/* add the inverted, cleaned lines to orig. Because
* the background was cleaned, the inversion is 0,
* so when you add, it doesn't lighten those pixels.
* It only lightens (to white) the pixels in the lines! */
pixInvert(pix6, pix6);
pix8 = pixAddGray(NULL, pix2, pix6);
pixWrite("/tmp/dave-proc8.png", pix8, IFF_PNG);
pixDisplayWrite(pix8, 1);
pix9 = pixOpenGray(pix8, 1, 9);
pixWrite("/tmp/dave-proc9.png", pix9, IFF_PNG);
pixDisplayWrite(pix9, 1);
pixCombineMasked(pix8, pix9, pix7);
pixWrite("/tmp/dave-result.png", pix8, IFF_PNG);
pixDisplayWrite(pix8, 1);
pixDisplayMultiple("/tmp/display/file*");
return 0;
}
int main_line_removal() {
PIX* pixs_source = pixRead("dave-start.png");
if (!pixs_source) {
printf("Error opening file");
return 1;
}
double deg2rad = 3.1415926535 / 180.;
l_float32 angle, conf, score;
PIX *pix1, *pix2, *pix3, *pix4, *pix5, *pix6, *pix7, *pix8, *pix9;
pix1 = pixThresholdToBinary(pixs_source, 160);
printf("Create line removal image\n");
pixWrite("line-removal/result.line-removal-1.tif", pix1, IFF_TIFF_G4);
pixFindSkew(pix1, &angle, &conf);
pix2 = pixRotateAMGray(pixs_source, deg2rad * angle, 160);
printf("Create line removal image\n");
pixWrite("line-removal/result.line-removal-2.tif", pix2, IFF_TIFF_G4);
l_int32 HORIZ = 1;
l_int32 VERT = 3;
pix3 = pixCloseGray(pix2, 51, HORIZ); //k?p?c 51?
printf("Create line removal image\n");
pixWrite("line-removal/result.line-removal-3.tif", pix3, IFF_TIFF_G4);
pix4 = pixErodeGray(pix3, 5, VERT); //k?p?c 5?
printf("Create line removal image\n");
pixWrite("line-removal/result.line-removal-4.tif", pix4, IFF_TIFF_G4);
pix5 = pix4;
pix5 = pixThresholdToValue(pix5, pix4, 230, 255);
printf("Create line removal image\n");
pixWrite("line-removal/result.line-removal-5.tif", pix5, IFF_TIFF_G4);
pix6 = pix5;
pix6 = pixThresholdToValue(pix5, pix5, 210, 0);
printf("Create line removal image\n");
pixWrite("line-removal/result.line-removal-6.tif", pix6, IFF_TIFF_G4);
pix7 = pixThresholdToBinary(pix6, 230);
printf("Create line removal image\n");
pixWrite("line-removal/result.line-removal-7.tif", pix7, IFF_TIFF_G4);
pixInvert(pix6, pix6);
pix8 = pixAddGray(NULL, pix2, pix6);
printf("Create line removal image\n");
pixWrite("line-removal/result.line-removal-8.tif", pix8, IFF_TIFF_G4);
VERT = 7;
pix9 = pixOpenGray(pix8, 3, VERT);
printf("Create line removal image\n");
pixWrite("line-removal/result.line-removal-9.tif", pix9, IFF_TIFF_G4);
if (pixCombineMasked(pix8, pix9, pix7)) {
printf("!!!Error while combining pixs!!!\n");
}
printf("Create line removal image\n");
pixWrite("line-removal/result.line-removal-final.tif", pix8, IFF_TIFF_G4);
printf("\n---\nEnd\n");
getchar();
return 0;
}