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twain3.0/3rdparty/hgOCR/leptonica/sel2.c

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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 sel2.c
* <pre>
*
* Contains definitions of simple structuring elements
*
* Basic brick structuring elements
* SELA *selaAddBasic()
* Linear horizontal and vertical
* Square
* Diagonals
*
* Simple hit-miss structuring elements
* SELA *selaAddHitMiss()
* Isolated foreground pixel
* Horizontal and vertical edges
* Slanted edge
* Corners
*
* Structuring elements for comparing with DWA operations
* SELA *selaAddDwaLinear()
* SELA *selaAddDwaCombs()
*
* Structuring elements for the intersection of lines
* SELA *selaAddCrossJunctions()
* SELA *selaAddTJunctions()
*
* Structuring elements for connectivity-preserving thinning operations
* SELA *sela4ccThin()
* SELA *sela8ccThin()
* SELA *sela4and8ccThin()
* </pre>
*/
#include <math.h>
#include "allheaders.h"
//static const l_int32 L_BUF_SIZE = 512;
#define L_BUF_SIZE 512
/* Linear brick sel sizes, including all those that are required
* for decomposable sels up to size 63. */
static const l_int32 num_linear = 25;
static const l_int32 basic_linear[] = {2, 3, 4, 5, 6, 7, 8, 9, 10, 11,
12, 13, 14, 15, 20, 21, 25, 30, 31, 35, 40, 41, 45, 50, 51};
/* ------------------------------------------------------------------- *
* Basic brick structuring elements *
* ------------------------------------------------------------------- */
/*!
* \brief selaAddBasic()
*
* \param[in] sela [optional]
* \return sela with additional sels, or NULL on error
*
* <pre>
* Notes:
* (1) Adds the following sels:
* ~ all linear (horiz, vert) brick sels that are
* necessary for decomposable sels up to size 63
* ~ square brick sels up to size 10
* ~ 4 diagonal sels
* </pre>
*/
SELA *
selaAddBasic(SELA *sela)
{
char name[L_BUF_SIZE];
l_int32 i, size;
SEL *sel;
PROCNAME("selaAddBasic");
if (!sela) {
if ((sela = selaCreate(0)) == NULL)
return (SELA *)ERROR_PTR("sela not made", procName, NULL);
}
/*--------------------------------------------------------------*
* Linear horizontal and vertical sels *
*--------------------------------------------------------------*/
for (i = 0; i < num_linear; i++) {
size = basic_linear[i];
sel = selCreateBrick(1, size, 0, size / 2, 1);
snprintf(name, L_BUF_SIZE, "sel_%dh", size);
selaAddSel(sela, sel, name, 0);
}
for (i = 0; i < num_linear; i++) {
size = basic_linear[i];
sel = selCreateBrick(size, 1, size / 2, 0, 1);
snprintf(name, L_BUF_SIZE, "sel_%dv", size);
selaAddSel(sela, sel, name, 0);
}
/*-----------------------------------------------------------*
* 2-d Bricks *
*-----------------------------------------------------------*/
for (i = 2; i <= 5; i++) {
sel = selCreateBrick(i, i, i / 2, i / 2, 1);
snprintf(name, L_BUF_SIZE, "sel_%d", i);
selaAddSel(sela, sel, name, 0);
}
/*-----------------------------------------------------------*
* Diagonals *
*-----------------------------------------------------------*/
/* 0c 1
1 0 */
sel = selCreateBrick(2, 2, 0, 0, 1);
selSetElement(sel, 0, 0, 0);
selSetElement(sel, 1, 1, 0);
selaAddSel(sela, sel, "sel_2dp", 0);
/* 1c 0
0 1 */
sel = selCreateBrick(2, 2, 0, 0, 1);
selSetElement(sel, 0, 1, 0);
selSetElement(sel, 1, 0, 0);
selaAddSel(sela, sel, "sel_2dm", 0);
/* Diagonal, slope +, size 5 */
sel = selCreate(5, 5, "sel_5dp");
selSetOrigin(sel, 2, 2);
selSetElement(sel, 0, 4, 1);
selSetElement(sel, 1, 3, 1);
selSetElement(sel, 2, 2, 1);
selSetElement(sel, 3, 1, 1);
selSetElement(sel, 4, 0, 1);
selaAddSel(sela, sel, "sel_5dp", 0);
/* Diagonal, slope -, size 5 */
sel = selCreate(5, 5, "sel_5dm");
selSetOrigin(sel, 2, 2);
selSetElement(sel, 0, 0, 1);
selSetElement(sel, 1, 1, 1);
selSetElement(sel, 2, 2, 1);
selSetElement(sel, 3, 3, 1);
selSetElement(sel, 4, 4, 1);
selaAddSel(sela, sel, "sel_5dm", 0);
return sela;
}
/* ------------------------------------------------------------------- *
* Simple hit-miss structuring elements *
* ------------------------------------------------------------------- */
/*!
* \brief selaAddHitMiss()
*
* \param[in] sela [optional]
* \return sela with additional sels, or NULL on error
*/
SELA *
selaAddHitMiss(SELA *sela)
{
SEL *sel;
PROCNAME("selaAddHitMiss");
if (!sela) {
if ((sela = selaCreate(0)) == NULL)
return (SELA *)ERROR_PTR("sela not made", procName, NULL);
}
#if 0 /* use just for testing */
sel = selCreateBrick(3, 3, 1, 1, 2);
selaAddSel(sela, sel, "sel_bad", 0);
#endif
/*--------------------------------------------------------------*
* Isolated foreground pixel *
*--------------------------------------------------------------*/
sel = selCreateBrick(3, 3, 1, 1, SEL_MISS);
selSetElement(sel, 1, 1, SEL_HIT);
selaAddSel(sela, sel, "sel_3hm", 0);
/*--------------------------------------------------------------*
* Horizontal and vertical edges *
*--------------------------------------------------------------*/
sel = selCreateBrick(2, 3, 0, 1, SEL_HIT);
selSetElement(sel, 1, 0, SEL_MISS);
selSetElement(sel, 1, 1, SEL_MISS);
selSetElement(sel, 1, 2, SEL_MISS);
selaAddSel(sela, sel, "sel_3de", 0);
sel = selCreateBrick(2, 3, 1, 1, SEL_HIT);
selSetElement(sel, 0, 0, SEL_MISS);
selSetElement(sel, 0, 1, SEL_MISS);
selSetElement(sel, 0, 2, SEL_MISS);
selaAddSel(sela, sel, "sel_3ue", 0);
sel = selCreateBrick(3, 2, 1, 0, SEL_HIT);
selSetElement(sel, 0, 1, SEL_MISS);
selSetElement(sel, 1, 1, SEL_MISS);
selSetElement(sel, 2, 1, SEL_MISS);
selaAddSel(sela, sel, "sel_3re", 0);
sel = selCreateBrick(3, 2, 1, 1, SEL_HIT);
selSetElement(sel, 0, 0, SEL_MISS);
selSetElement(sel, 1, 0, SEL_MISS);
selSetElement(sel, 2, 0, SEL_MISS);
selaAddSel(sela, sel, "sel_3le", 0);
/*--------------------------------------------------------------*
* Slanted edge *
*--------------------------------------------------------------*/
sel = selCreateBrick(13, 6, 6, 2, SEL_DONT_CARE);
selSetElement(sel, 0, 3, SEL_MISS);
selSetElement(sel, 0, 5, SEL_HIT);
selSetElement(sel, 4, 2, SEL_MISS);
selSetElement(sel, 4, 4, SEL_HIT);
selSetElement(sel, 8, 1, SEL_MISS);
selSetElement(sel, 8, 3, SEL_HIT);
selSetElement(sel, 12, 0, SEL_MISS);
selSetElement(sel, 12, 2, SEL_HIT);
selaAddSel(sela, sel, "sel_sl1", 0);
/*--------------------------------------------------------------*
* Corners *
* This allows for up to 3 missing edge pixels at the corner *
*--------------------------------------------------------------*/
sel = selCreateBrick(4, 4, 1, 1, SEL_MISS);
selSetElement(sel, 1, 1, SEL_DONT_CARE);
selSetElement(sel, 1, 2, SEL_DONT_CARE);
selSetElement(sel, 2, 1, SEL_DONT_CARE);
selSetElement(sel, 1, 3, SEL_HIT);
selSetElement(sel, 2, 2, SEL_HIT);
selSetElement(sel, 2, 3, SEL_HIT);
selSetElement(sel, 3, 1, SEL_HIT);
selSetElement(sel, 3, 2, SEL_HIT);
selSetElement(sel, 3, 3, SEL_HIT);
selaAddSel(sela, sel, "sel_ulc", 0);
sel = selCreateBrick(4, 4, 1, 2, SEL_MISS);
selSetElement(sel, 1, 1, SEL_DONT_CARE);
selSetElement(sel, 1, 2, SEL_DONT_CARE);
selSetElement(sel, 2, 2, SEL_DONT_CARE);
selSetElement(sel, 1, 0, SEL_HIT);
selSetElement(sel, 2, 0, SEL_HIT);
selSetElement(sel, 2, 1, SEL_HIT);
selSetElement(sel, 3, 0, SEL_HIT);
selSetElement(sel, 3, 1, SEL_HIT);
selSetElement(sel, 3, 2, SEL_HIT);
selaAddSel(sela, sel, "sel_urc", 0);
sel = selCreateBrick(4, 4, 2, 1, SEL_MISS);
selSetElement(sel, 1, 1, SEL_DONT_CARE);
selSetElement(sel, 2, 1, SEL_DONT_CARE);
selSetElement(sel, 2, 2, SEL_DONT_CARE);
selSetElement(sel, 0, 1, SEL_HIT);
selSetElement(sel, 0, 2, SEL_HIT);
selSetElement(sel, 0, 3, SEL_HIT);
selSetElement(sel, 1, 2, SEL_HIT);
selSetElement(sel, 1, 3, SEL_HIT);
selSetElement(sel, 2, 3, SEL_HIT);
selaAddSel(sela, sel, "sel_llc", 0);
sel = selCreateBrick(4, 4, 2, 2, SEL_MISS);
selSetElement(sel, 1, 2, SEL_DONT_CARE);
selSetElement(sel, 2, 1, SEL_DONT_CARE);
selSetElement(sel, 2, 2, SEL_DONT_CARE);
selSetElement(sel, 0, 0, SEL_HIT);
selSetElement(sel, 0, 1, SEL_HIT);
selSetElement(sel, 0, 2, SEL_HIT);
selSetElement(sel, 1, 0, SEL_HIT);
selSetElement(sel, 1, 1, SEL_HIT);
selSetElement(sel, 2, 0, SEL_HIT);
selaAddSel(sela, sel, "sel_lrc", 0);
return sela;
}
/* ------------------------------------------------------------------- *
* Structuring elements for comparing with DWA operations *
* ------------------------------------------------------------------- */
/*!
* \brief selaAddDwaLinear()
*
* \param[in] sela [optional]
* \return sela with additional sels, or NULL on error
*
* <pre>
* Notes:
* (1) Adds all linear (horizontal, vertical) sels from
* 2 to 63 pixels in length, which are the sizes over
* which dwa code can be generated.
* </pre>
*/
SELA *
selaAddDwaLinear(SELA *sela)
{
char name[L_BUF_SIZE];
l_int32 i;
SEL *sel;
PROCNAME("selaAddDwaLinear");
if (!sela) {
if ((sela = selaCreate(0)) == NULL)
return (SELA *)ERROR_PTR("sela not made", procName, NULL);
}
for (i = 2; i < 64; i++) {
sel = selCreateBrick(1, i, 0, i / 2, 1);
snprintf(name, L_BUF_SIZE, "sel_%dh", i);
selaAddSel(sela, sel, name, 0);
}
for (i = 2; i < 64; i++) {
sel = selCreateBrick(i, 1, i / 2, 0, 1);
snprintf(name, L_BUF_SIZE, "sel_%dv", i);
selaAddSel(sela, sel, name, 0);
}
return sela;
}
/*!
* \brief selaAddDwaCombs()
*
* \param[in] sela [optional]
* \return sela with additional sels, or NULL on error
*
* <pre>
* Notes:
* (1) Adds all comb (horizontal, vertical) Sels that are
* used in composite linear morphological operations
* up to 63 pixels in length, which are the sizes over
* which dwa code can be generated.
* </pre>
*/
SELA *
selaAddDwaCombs(SELA *sela)
{
char name[L_BUF_SIZE];
l_int32 i, f1, f2, prevsize, size;
SEL *selh, *selv;
PROCNAME("selaAddDwaCombs");
if (!sela) {
if ((sela = selaCreate(0)) == NULL)
return (SELA *)ERROR_PTR("sela not made", procName, NULL);
}
prevsize = 0;
for (i = 4; i < 64; i++) {
selectComposableSizes(i, &f1, &f2);
size = f1 * f2;
if (size == prevsize)
continue;
selectComposableSels(i, L_HORIZ, NULL, &selh);
selectComposableSels(i, L_VERT, NULL, &selv);
snprintf(name, L_BUF_SIZE, "sel_comb_%dh", size);
selaAddSel(sela, selh, name, 0);
snprintf(name, L_BUF_SIZE, "sel_comb_%dv", size);
selaAddSel(sela, selv, name, 0);
prevsize = size;
}
return sela;
}
/* ------------------------------------------------------------------- *
* Structuring elements for the intersection of lines *
* ------------------------------------------------------------------- */
/*!
* \brief selaAddCrossJunctions()
*
* \param[in] sela [optional]
* \param[in] hlsize length of each line of hits from origin
* \param[in] mdist distance of misses from the origin
* \param[in] norient number of orientations; max of 8
* \param[in] debugflag 1 for debug output
* \return sela with additional sels, or NULL on error
*
* <pre>
* Notes:
* (1) Adds hitmiss Sels for the intersection of two lines.
* If the lines are very thin, they must be nearly orthogonal
* to register.
* (2) The number of Sels generated is equal to %norient.
* (3) If %norient == 2, this generates 2 Sels of crosses, each with
* two perpendicular lines of hits. One Sel has horizontal and
* vertical hits; the other has hits along lines at +-45 degrees.
* Likewise, if %norient == 3, this generates 3 Sels of crosses
* oriented at 30 degrees with each other.
* (4) It is suggested that %hlsize be chosen at least 1 greater
* than %mdist. Try values of (%hlsize, %mdist) such as
* (6,5), (7,6), (8,7), (9,7), etc.
* </pre>
*/
SELA *
selaAddCrossJunctions(SELA *sela,
l_float32 hlsize,
l_float32 mdist,
l_int32 norient,
l_int32 debugflag)
{
char name[L_BUF_SIZE];
l_int32 i, j, w, xc, yc;
l_float64 pi, halfpi, radincr, radang;
l_float64 angle;
PIX *pixc, *pixm, *pixt;
PIXA *pixa;
PTA *pta1, *pta2, *pta3, *pta4;
SEL *sel;
PROCNAME("selaAddCrossJunctions");
if (hlsize <= 0)
return (SELA *)ERROR_PTR("hlsize not > 0", procName, NULL);
if (norient < 1 || norient > 8)
return (SELA *)ERROR_PTR("norient not in [1, ... 8]", procName, NULL);
if (!sela) {
if ((sela = selaCreate(0)) == NULL)
return (SELA *)ERROR_PTR("sela not made", procName, NULL);
}
pi = 3.1415926535;
halfpi = 3.1415926535 / 2.0;
radincr = halfpi / (l_float64)norient;
w = (l_int32)(2.2 * (L_MAX(hlsize, mdist) + 0.5));
if (w % 2 == 0)
w++;
xc = w / 2;
yc = w / 2;
pixa = pixaCreate(norient);
for (i = 0; i < norient; i++) {
/* Set the don't cares */
pixc = pixCreate(w, w, 32);
pixSetAll(pixc);
/* Add the green lines of hits */
pixm = pixCreate(w, w, 1);
radang = (l_float32)i * radincr;
pta1 = generatePtaLineFromPt(xc, yc, hlsize + 1, radang);
pta2 = generatePtaLineFromPt(xc, yc, hlsize + 1, radang + halfpi);
pta3 = generatePtaLineFromPt(xc, yc, hlsize + 1, radang + pi);
pta4 = generatePtaLineFromPt(xc, yc, hlsize + 1, radang + pi + halfpi);
ptaJoin(pta1, pta2, 0, -1);
ptaJoin(pta1, pta3, 0, -1);
ptaJoin(pta1, pta4, 0, -1);
pixRenderPta(pixm, pta1, L_SET_PIXELS);
pixPaintThroughMask(pixc, pixm, 0, 0, 0x00ff0000);
ptaDestroy(&pta1);
ptaDestroy(&pta2);
ptaDestroy(&pta3);
ptaDestroy(&pta4);
/* Add red misses between the lines */
for (j = 0; j < 4; j++) {
angle = radang + (j - 0.5) * halfpi;
pixSetPixel(pixc, xc + (l_int32)(mdist * cos(angle)),
yc + (l_int32)(mdist * sin(angle)), 0xff000000);
}
/* Add dark green for origin */
pixSetPixel(pixc, xc, yc, 0x00550000);
/* Generate the sel */
sel = selCreateFromColorPix(pixc, NULL);
snprintf(name, sizeof(name), "sel_cross_%d", i);
selaAddSel(sela, sel, name, 0);
if (debugflag) {
pixt = pixScaleBySampling(pixc, 10.0, 10.0);
pixaAddPix(pixa, pixt, L_INSERT);
}
pixDestroy(&pixm);
pixDestroy(&pixc);
}
if (debugflag) {
l_int32 w;
lept_mkdir("lept/sel");
pixaGetPixDimensions(pixa, 0, &w, NULL, NULL);
pixt = pixaDisplayTiledAndScaled(pixa, 32, w, 1, 0, 10, 2);
pixWriteDebug("/tmp/lept/sel/xsel1.png", pixt, IFF_PNG);
pixDisplay(pixt, 0, 100);
pixDestroy(&pixt);
pixt = selaDisplayInPix(sela, 15, 2, 20, 1);
pixWriteDebug("/tmp/lept/sel/xsel2.png", pixt, IFF_PNG);
pixDisplay(pixt, 500, 100);
pixDestroy(&pixt);
selaWriteStream(stderr, sela);
}
pixaDestroy(&pixa);
return sela;
}
/*!
* \brief selaAddTJunctions()
*
* \param[in] sela [optional]
* \param[in] hlsize length of each line of hits from origin
* \param[in] mdist distance of misses from the origin
* \param[in] norient number of orientations; max of 8
* \param[in] debugflag 1 for debug output
* \return sela with additional sels, or NULL on error
*
* <pre>
* Notes:
* (1) Adds hitmiss Sels for the T-junction of two lines.
* If the lines are very thin, they must be nearly orthogonal
* to register.
* (2) The number of Sels generated is 4 * %norient.
* (3) It is suggested that %hlsize be chosen at least 1 greater
* than %mdist. Try values of (%hlsize, %mdist) such as
* (6,5), (7,6), (8,7), (9,7), etc.
* </pre>
*/
SELA *
selaAddTJunctions(SELA *sela,
l_float32 hlsize,
l_float32 mdist,
l_int32 norient,
l_int32 debugflag)
{
char name[L_BUF_SIZE];
l_int32 i, j, k, w, xc, yc;
l_float64 pi, halfpi, radincr, jang, radang;
l_float64 angle[3], dist[3];
PIX *pixc, *pixm, *pixt;
PIXA *pixa;
PTA *pta1, *pta2, *pta3;
SEL *sel;
PROCNAME("selaAddTJunctions");
if (hlsize <= 2)
return (SELA *)ERROR_PTR("hlsizel not > 1", procName, NULL);
if (norient < 1 || norient > 8)
return (SELA *)ERROR_PTR("norient not in [1, ... 8]", procName, NULL);
if (!sela) {
if ((sela = selaCreate(0)) == NULL)
return (SELA *)ERROR_PTR("sela not made", procName, NULL);
}
pi = 3.1415926535;
halfpi = 3.1415926535 / 2.0;
radincr = halfpi / (l_float32)norient;
w = (l_int32)(2.4 * (L_MAX(hlsize, mdist) + 0.5));
if (w % 2 == 0)
w++;
xc = w / 2;
yc = w / 2;
pixa = pixaCreate(4 * norient);
for (i = 0; i < norient; i++) {
for (j = 0; j < 4; j++) { /* 4 orthogonal orientations */
jang = (l_float32)j * halfpi;
/* Set the don't cares */
pixc = pixCreate(w, w, 32);
pixSetAll(pixc);
/* Add the green lines of hits */
pixm = pixCreate(w, w, 1);
radang = (l_float32)i * radincr;
pta1 = generatePtaLineFromPt(xc, yc, hlsize + 1, jang + radang);
pta2 = generatePtaLineFromPt(xc, yc, hlsize + 1,
jang + radang + halfpi);
pta3 = generatePtaLineFromPt(xc, yc, hlsize + 1,
jang + radang + pi);
ptaJoin(pta1, pta2, 0, -1);
ptaJoin(pta1, pta3, 0, -1);
pixRenderPta(pixm, pta1, L_SET_PIXELS);
pixPaintThroughMask(pixc, pixm, 0, 0, 0x00ff0000);
ptaDestroy(&pta1);
ptaDestroy(&pta2);
ptaDestroy(&pta3);
/* Add red misses between the lines */
angle[0] = radang + jang - halfpi;
angle[1] = radang + jang + 0.5 * halfpi;
angle[2] = radang + jang + 1.5 * halfpi;
dist[0] = 0.8 * mdist;
dist[1] = dist[2] = mdist;
for (k = 0; k < 3; k++) {
pixSetPixel(pixc, xc + (l_int32)(dist[k] * cos(angle[k])),
yc + (l_int32)(dist[k] * sin(angle[k])),
0xff000000);
}
/* Add dark green for origin */
pixSetPixel(pixc, xc, yc, 0x00550000);
/* Generate the sel */
sel = selCreateFromColorPix(pixc, NULL);
snprintf(name, sizeof(name), "sel_cross_%d", 4 * i + j);
selaAddSel(sela, sel, name, 0);
if (debugflag) {
pixt = pixScaleBySampling(pixc, 10.0, 10.0);
pixaAddPix(pixa, pixt, L_INSERT);
}
pixDestroy(&pixm);
pixDestroy(&pixc);
}
}
if (debugflag) {
l_int32 w;
lept_mkdir("lept/sel");
pixaGetPixDimensions(pixa, 0, &w, NULL, NULL);
pixt = pixaDisplayTiledAndScaled(pixa, 32, w, 4, 0, 10, 2);
pixWriteDebug("/tmp/lept/sel/tsel1.png", pixt, IFF_PNG);
pixDisplay(pixt, 0, 100);
pixDestroy(&pixt);
pixt = selaDisplayInPix(sela, 15, 2, 20, 4);
pixWriteDebug("/tmp/lept/sel/tsel2.png", pixt, IFF_PNG);
pixDisplay(pixt, 500, 100);
pixDestroy(&pixt);
selaWriteStream(stderr, sela);
}
pixaDestroy(&pixa);
return sela;
}
/* -------------------------------------------------------------------------- *
* Structuring elements for connectivity-preserving thinning operations *
* -------------------------------------------------------------------------- */
/* ------------------------------------------------------------
* These sels (and their rotated counterparts) are the useful
* 3x3 Sels for thinning. The notation is based on
* "Connectivity-preserving morphological image transformations,"
* a version of which can be found at
* http://www.leptonica.com/papers/conn.pdf
* ------------------------------------------------------------ */
/* Sels for 4-connected thinning */
static const char *sel_4_1 = " x"
"oCx"
" x";
static const char *sel_4_2 = " x"
"oCx"
" o ";
static const char *sel_4_3 = " o "
"oCx"
" x";
static const char *sel_4_4 = " o "
"oCx"
" o ";
static const char *sel_4_5 = " ox"
"oCx"
" o ";
static const char *sel_4_6 = " o "
"oCx"
" ox";
static const char *sel_4_7 = " xx"
"oCx"
" o ";
static const char *sel_4_8 = " x"
"oCx"
"o x";
static const char *sel_4_9 = "o x"
"oCx"
" x";
/* Sels for 8-connected thinning */
static const char *sel_8_1 = " x "
"oCx"
" x ";
static const char *sel_8_2 = " x "
"oCx"
"o ";
static const char *sel_8_3 = "o "
"oCx"
" x ";
static const char *sel_8_4 = "o "
"oCx"
"o ";
static const char *sel_8_5 = "o x"
"oCx"
"o ";
static const char *sel_8_6 = "o "
"oCx"
"o x";
static const char *sel_8_7 = " x "
"oCx"
"oo ";
static const char *sel_8_8 = " x "
"oCx"
"ox ";
static const char *sel_8_9 = "ox "
"oCx"
" x ";
/* Sels for both 4 and 8-connected thinning */
static const char *sel_48_1 = " xx"
"oCx"
"oo ";
static const char *sel_48_2 = "o x"
"oCx"
"o x";
/*!
* \brief sela4ccThin()
*
* \param[in] sela [optional]
* \return sela with additional sels, or NULL on error
*
* <pre>
* Notes:
* (1) Adds the 9 basic sels for 4-cc thinning.
* </pre>
*/
SELA *
sela4ccThin(SELA *sela)
{
SEL *sel;
if (!sela) sela = selaCreate(9);
sel = selCreateFromString(sel_4_1, 3, 3, "sel_4_1");
selaAddSel(sela, sel, NULL, 0);
sel = selCreateFromString(sel_4_2, 3, 3, "sel_4_2");
selaAddSel(sela, sel, NULL, 0);
sel = selCreateFromString(sel_4_3, 3, 3, "sel_4_3");
selaAddSel(sela, sel, NULL, 0);
sel = selCreateFromString(sel_4_4, 3, 3, "sel_4_4");
selaAddSel(sela, sel, NULL, 0);
sel = selCreateFromString(sel_4_5, 3, 3, "sel_4_5");
selaAddSel(sela, sel, NULL, 0);
sel = selCreateFromString(sel_4_6, 3, 3, "sel_4_6");
selaAddSel(sela, sel, NULL, 0);
sel = selCreateFromString(sel_4_7, 3, 3, "sel_4_7");
selaAddSel(sela, sel, NULL, 0);
sel = selCreateFromString(sel_4_8, 3, 3, "sel_4_8");
selaAddSel(sela, sel, NULL, 0);
sel = selCreateFromString(sel_4_9, 3, 3, "sel_4_9");
selaAddSel(sela, sel, NULL, 0);
return sela;
}
/*!
* \brief sela8ccThin()
*
* \param[in] sela [optional]
* \return sela with additional sels, or NULL on error
*
* <pre>
* Notes:
* (1) Adds the 9 basic sels for 8-cc thinning.
* </pre>
*/
SELA *
sela8ccThin(SELA *sela)
{
SEL *sel;
if (!sela) sela = selaCreate(9);
sel = selCreateFromString(sel_8_1, 3, 3, "sel_8_1");
selaAddSel(sela, sel, NULL, 0);
sel = selCreateFromString(sel_8_2, 3, 3, "sel_8_2");
selaAddSel(sela, sel, NULL, 0);
sel = selCreateFromString(sel_8_3, 3, 3, "sel_8_3");
selaAddSel(sela, sel, NULL, 0);
sel = selCreateFromString(sel_8_4, 3, 3, "sel_8_4");
selaAddSel(sela, sel, NULL, 0);
sel = selCreateFromString(sel_8_5, 3, 3, "sel_8_5");
selaAddSel(sela, sel, NULL, 0);
sel = selCreateFromString(sel_8_6, 3, 3, "sel_8_6");
selaAddSel(sela, sel, NULL, 0);
sel = selCreateFromString(sel_8_7, 3, 3, "sel_8_7");
selaAddSel(sela, sel, NULL, 0);
sel = selCreateFromString(sel_8_8, 3, 3, "sel_8_8");
selaAddSel(sela, sel, NULL, 0);
sel = selCreateFromString(sel_8_9, 3, 3, "sel_8_9");
selaAddSel(sela, sel, NULL, 0);
return sela;
}
/*!
* \brief sela4and8ccThin()
*
* \param[in] sela [optional]
* \return sela with additional sels, or NULL on error
*
* <pre>
* Notes:
* (1) Adds the 2 basic sels for either 4-cc or 8-cc thinning.
* </pre>
*/
SELA *
sela4and8ccThin(SELA *sela)
{
SEL *sel;
if (!sela) sela = selaCreate(2);
sel = selCreateFromString(sel_48_1, 3, 3, "sel_48_1");
selaAddSel(sela, sel, NULL, 0);
sel = selCreateFromString(sel_48_2, 3, 3, "sel_48_2");
selaAddSel(sela, sel, NULL, 0);
return sela;
}
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