| commit | author | age | ||
| 5d5578 | 1 | /* EDIT: Explain what this source file does |
| SP | 2 | Copyright (C) 2019 Samo Penic. |
| 3 | ||
| 4 | This file is part of Sizif. | |
| 5 | ||
| 6 | This program is free software: you can redistribute it and/or modify | |
| 7 | it under the terms of the GNU General Public License as published by | |
| 8 | the Free Software Foundation, either version 3 of the License, or | |
| 9 | (at your option) any later version. | |
| 10 | ||
| 11 | This program is distributed in the hope that it will be useful, | |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 14 | GNU General Public License for more details. | |
| 15 | ||
| 16 | You should have received a copy of the GNU General Public License | |
| 17 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
| 18 | ||
| 19 | #include <leptonica/allheaders.h> | |
| 20 | #define DESKEW_REDUCTION 4 | |
| 21 | ||
| 22 | PIX *loadimage(char *filename){ | |
| 23 | PIX *pix, *pixt; | |
| 24 | int format, bpp; | |
| 25 | /* format=fileformat(filename); | |
| 26 | // In later versions of leptonica you will have to do this | |
| 27 | // pixReadHeader(filename, format,NULL,NULL,NULL,bpp,NULL); | |
| 28 | if(format!=IFF_PNG && format!=IFF_JFIF_JPEG && format!=IFF_TIFF && format!= | |
| 29 | IFF_GIF && format!=7 && format!=8){ | |
| 30 | dfprintf(stderr,"Not recognised file format %i", format); | |
| 31 | return NULL; | |
| 32 | } */ | |
| 33 | if ((pix = pixRead(filename)) == NULL) return NULL; | |
| 34 | ||
| 35 | /* TODO: convert image to 1-bpp 300dpi regardless of scan */ | |
| 36 | bpp=pixGetDepth(pix); | |
| 37 | if(bpp>1){ | |
| 38 | /* | |
| 39 | printf("Bits per pixel=%i",bpp); | |
| 40 | exit(1); */ | |
| 41 | //pixThresholdForFgBg(pix,5,100,NULL,NULL); | |
| 42 | //pixContrastTRC(pix, pix, 1000); | |
| 43 | pixt = pixContrastNorm(NULL, pix, 10, 10, 40, 2, 2); | |
| 44 | pixDestroy(&pix); | |
| 45 | pix = pixGammaTRC(NULL, pixt, 1.5, 50, 235); | |
| 46 | pixt=pixThresholdToBinary(pix, 200); | |
| 47 | //pixt=pixThreshold8(pix,1,1,0); | |
| 48 | pixDestroy(&pix); | |
| 49 | pix=pixt; | |
| 50 | } | |
| 51 | return pix; | |
| 52 | } | |
| 53 | ||
| 54 | PIX *lineremoval(PIX *pixs){ | |
| 55 | PIX *pixd = pixMorphCompSequence(pixs, "o2.2", 0); /* Odstranimo pikice o2.2*/ | |
| 56 | return pixd; | |
| 57 | } | |
| 58 | ||
| 59 | float deskew(PIX *pix){ | |
| 60 | float angle; | |
| 61 | PIX *pixd1; | |
| 62 | pixd1=pixFindSkewAndDeskew(pix, DESKEW_REDUCTION, &angle, NULL); | |
| 63 | return angle; | |
| 64 | } | |
| 65 | ||
| 66 | ||
| 67 | float repair_scanned_image(PIX *pixs){ | |
| 68 | PIX *pixd= lineremoval(pixs); | |
| 69 | float angle=deskew(pixd); | |
| 70 | return angle; | |
| 71 | } | |
| 72 | ||
| 73 | float get_scan_angle(char *filename){ | |
| 74 | PIX *pix=loadimage(filename); | |
| 75 | if (pix==NULL) return 0.0; | |
| 76 | return repair_scanned_image(pix); | |
| 77 | } | |
| 78 | ||
