/* EDIT: Explain what this source file does
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Copyright (C) 2019 Samo Penic.
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This file is part of Sizif.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include <leptonica/allheaders.h>
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#define DESKEW_REDUCTION 4
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PIX *loadimage(char *filename){
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PIX *pix, *pixt;
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int format, bpp;
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/* format=fileformat(filename);
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// In later versions of leptonica you will have to do this
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// pixReadHeader(filename, format,NULL,NULL,NULL,bpp,NULL);
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if(format!=IFF_PNG && format!=IFF_JFIF_JPEG && format!=IFF_TIFF && format!=
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IFF_GIF && format!=7 && format!=8){
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dfprintf(stderr,"Not recognised file format %i", format);
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return NULL;
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} */
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if ((pix = pixRead(filename)) == NULL) return NULL;
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/* TODO: convert image to 1-bpp 300dpi regardless of scan */
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bpp=pixGetDepth(pix);
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if(bpp>1){
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/*
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printf("Bits per pixel=%i",bpp);
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exit(1); */
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//pixThresholdForFgBg(pix,5,100,NULL,NULL);
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//pixContrastTRC(pix, pix, 1000);
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pixt = pixContrastNorm(NULL, pix, 10, 10, 40, 2, 2);
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pixDestroy(&pix);
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pix = pixGammaTRC(NULL, pixt, 1.5, 50, 235);
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pixt=pixThresholdToBinary(pix, 200);
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//pixt=pixThreshold8(pix,1,1,0);
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pixDestroy(&pix);
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pix=pixt;
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}
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return pix;
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}
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PIX *lineremoval(PIX *pixs){
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PIX *pixd = pixMorphCompSequence(pixs, "o2.2", 0); /* Odstranimo pikice o2.2*/
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return pixd;
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}
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float deskew(PIX *pix){
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float angle;
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PIX *pixd1;
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pixd1=pixFindSkewAndDeskew(pix, DESKEW_REDUCTION, &angle, NULL);
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return angle;
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}
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float repair_scanned_image(PIX *pixs){
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PIX *pixd= lineremoval(pixs);
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float angle=deskew(pixd);
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return angle;
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}
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float get_scan_angle(char *filename){
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PIX *pix=loadimage(filename);
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if (pix==NULL) return 0.0;
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return repair_scanned_image(pix);
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}
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