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/*====================================================================*
- Copyright (C) 2001 Leptonica. All rights reserved.
-
- Redistribution and use in source and binary forms, with or without
- modification, are permitted provided that the following conditions
- are met:
- 1. Redistributions of source code must retain the above copyright
- notice, this list of conditions and the following disclaimer.
- 2. Redistributions in binary form must reproduce the above
- copyright notice, this list of conditions and the following
- disclaimer in the documentation and/or other materials
- provided with the distribution.
-
- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL ANY
- CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
- OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*====================================================================*/
/*!
* \file convertfiles.c
* <pre>
*
* Conversion to 1 bpp
* l_int32 convertFilesTo1bpp()
*
* These are utility functions that will perform depth conversion
* on selected files, writing the results to a specified directory.
* We start with conversion to 1 bpp.
* </pre>
*/
#ifdef HAVE_CONFIG_H
#include <config_auto.h>
#endif /* HAVE_CONFIG_H */
#include <string.h>
#include "allheaders.h"
/*------------------------------------------------------------------*
* Conversion to 1 bpp *
*------------------------------------------------------------------*/
/*!
* \brief convertFilesTo1bpp()
*
* \param[in] dirin
* \param[in] substr [optional] substring filter on filenames;
8 can be NULL
* \param[in] upscaling 1, 2 or 4; only for input color or grayscale
* \param[in] thresh global threshold for binarization; 0 for default
* \param[in] firstpage
* \param[in] npages use 0 to do all from %firstpage to the end
* \param[in] dirout
* \param[in] outformat IFF_PNG, IFF_TIFF_G4
* \return 0 if OK, 1 on error
*
* <pre>
* Notes:
* (1) Images are sorted lexicographically, and the names in the
* output directory are retained except for the extension.
* </pre>
*/
l_ok
convertFilesTo1bpp(const char *dirin,
const char *substr,
l_int32 upscaling,
l_int32 thresh,
l_int32 firstpage,
l_int32 npages,
const char *dirout,
l_int32 outformat)
{
l_int32 i, nfiles;
char buf[512];
char *fname, *tail, *basename;
PIX *pixs, *pixg1, *pixg2, *pixb;
SARRAY *safiles;
PROCNAME("convertFilesTo1bpp");
if (!dirin)
return ERROR_INT("dirin", procName, 1);
if (!dirout)
return ERROR_INT("dirout", procName, 1);
if (upscaling != 1 && upscaling != 2 && upscaling != 4)
return ERROR_INT("invalid upscaling factor", procName, 1);
if (thresh <= 0) thresh = 180;
if (firstpage < 0) firstpage = 0;
if (npages < 0) npages = 0;
if (outformat != IFF_TIFF_G4)
outformat = IFF_PNG;
safiles = getSortedPathnamesInDirectory(dirin, substr, firstpage, npages);
if (!safiles)
return ERROR_INT("safiles not made", procName, 1);
if ((nfiles = sarrayGetCount(safiles)) == 0) {
sarrayDestroy(&safiles);
return ERROR_INT("no matching files in the directory", procName, 1);
}
for (i = 0; i < nfiles; i++) {
fname = sarrayGetString(safiles, i, L_NOCOPY);
if ((pixs = pixRead(fname)) == NULL) {
L_WARNING("Couldn't read file %s\n", procName, fname);
continue;
}
if (pixGetDepth(pixs) == 32)
pixg1 = pixConvertRGBToLuminance(pixs);
else
pixg1 = pixClone(pixs);
pixg2 = pixRemoveColormap(pixg1, REMOVE_CMAP_TO_GRAYSCALE);
if (pixGetDepth(pixg2) == 1) {
pixb = pixClone(pixg2);
} else {
if (upscaling == 1)
pixb = pixThresholdToBinary(pixg2, thresh);
else if (upscaling == 2)
pixb = pixScaleGray2xLIThresh(pixg2, thresh);
else /* upscaling == 4 */
pixb = pixScaleGray4xLIThresh(pixg2, thresh);
}
pixDestroy(&pixs);
pixDestroy(&pixg1);
pixDestroy(&pixg2);
splitPathAtDirectory(fname, NULL, &tail);
splitPathAtExtension(tail, &basename, NULL);
if (outformat == IFF_TIFF_G4) {
snprintf(buf, sizeof(buf), "%s/%s.tif", dirout, basename);
pixWrite(buf, pixb, IFF_TIFF_G4);
} else {
snprintf(buf, sizeof(buf), "%s/%s.png", dirout, basename);
pixWrite(buf, pixb, IFF_PNG);
}
pixDestroy(&pixb);
LEPT_FREE(tail);
LEPT_FREE(basename);
}
sarrayDestroy(&safiles);
return 0;
}
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