diff options
author | scuri <scuri> | 2008-10-17 06:10:15 +0000 |
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committer | scuri <scuri> | 2008-10-17 06:10:15 +0000 |
commit | 5a422aba704c375a307a902bafe658342e209906 (patch) | |
tree | 5005011e086bb863d8fb587ad3319bbec59b2447 /src/process/im_analyze.cpp |
First commit - moving from LuaForge to SourceForge
Diffstat (limited to 'src/process/im_analyze.cpp')
-rw-r--r-- | src/process/im_analyze.cpp | 1262 |
1 files changed, 1262 insertions, 0 deletions
diff --git a/src/process/im_analyze.cpp b/src/process/im_analyze.cpp new file mode 100644 index 0000000..50bcbcd --- /dev/null +++ b/src/process/im_analyze.cpp @@ -0,0 +1,1262 @@ +/** \file + * \brief Image Analysis + * + * See Copyright Notice in im_lib.h + * $Id: im_analyze.cpp,v 1.1 2008/10/17 06:16:33 scuri Exp $ + */ + + +#include <im.h> +#include <im_util.h> +#include <im_math.h> + +#include "im_process_ana.h" +#include "im_process_pon.h" + +#include <stdlib.h> +#include <stdio.h> +#include <memory.h> +#include <string.h> + +#define MAX_COUNT 65536 // maximum number of regions + +/* ajust the alias table to be a remap table (final step) */ +static void alias_update(imushort* alias_table, int ®ion_count) +{ + int i, real_count = region_count; + + for (i = 0; i < region_count; i++) + { + if (alias_table[i]) + { + // search for the first alias + imushort prev = alias_table[i]; + while (alias_table[prev]) + prev = alias_table[prev]; + + alias_table[i] = prev; + real_count--; // decrement aliases from the region count + } + } + + // now all the aliases in the same group point to only one alias + // transform the alias table into a remap table + + alias_table[0] = 0; + alias_table[1] = 0; // border is mapped to background + + int r = 1; + for (i = 2; i < region_count; i++) + { + if (!alias_table[i]) + { + alias_table[i] = (imushort)r; // only non alias get real values + r++; + } + else + alias_table[i] = (imushort)(alias_table[alias_table[i]]); + } + + region_count = real_count-2; // remove the regions (background,border) from the count +} + +/* find the smallest region number to be set as alias. */ +static void alias_getmin(imushort* alias_table, imushort region, imushort &min) +{ + while (alias_table[region]) + { + if (min > alias_table[region]) + min = alias_table[region]; + + region = alias_table[region]; + } +} + +/* replace all the aliases of a region by its smallest value. */ +static void alias_setmin(imushort* alias_table, imushort region, imushort min) +{ + while (alias_table[region]) + { + imushort next_region = alias_table[region]; + alias_table[region] = min; + region = next_region; + } + + if (region != min) + alias_table[region] = min; +} + +/* set a region number to be an alias of another */ +static void alias_set(imushort* alias_table, imushort region1, imushort region2) +{ + if (region1 == region2) + return; + + imushort min = region1<region2? region1: region2; + + alias_getmin(alias_table, region1, min); + alias_getmin(alias_table, region2, min); + + if (region1 != min && alias_table[region1] != min) + alias_setmin(alias_table, region1, min); + if (region2 != min && alias_table[region2] != min) + alias_setmin(alias_table, region2, min); +} + +static int DoAnalyzeFindRegions(int width, int height, imbyte* map, imushort* new_map, int connect) +{ + int i, j; + + // mark the pixels that touch the border + // if a region touch the border, is the invalid region 1 + + imbyte* pmap = map; + imushort* new_pmap = new_map; + for (j = 0; j < width; j++) // first line + { + if (pmap[j]) + new_pmap[j] = 1; + } + pmap += width; + new_pmap += width; + + for (i = 1; i < height-1; i++) // first column + { + if (pmap[0]) + new_pmap[0] = 1; + + pmap += width; + new_pmap += width; + } + + // find and connect the regions + + imbyte* pmap1 = map; // previous line (line 0) + imushort* new_pmap1 = new_map; + + pmap = map + width; // current line (line 1) + new_pmap = new_map + width; + + int region_count = 2; // 0- background, 1-border + imushort* alias_table = new imushort [MAX_COUNT]; + memset(alias_table, 0, MAX_COUNT); // aliases are all zero at start (not used) + + for (i = 1; i < height; i++) + { + for (j = 1; j < width; j++) + { + int has_j1 = j < width-1? 1: 0; + if (pmap[j]) + { + if (pmap[j-1] || pmap1[j] || + (connect == 8 && (pmap1[j-1] || (has_j1&&pmap1[j+1])))) // 4 or 8 connected to the previous neighbors + { + imushort region = 0; + if (i == height-1 || j == width-1) + { + region = new_pmap[j] = 1; + } + + if (pmap[j-1]) + { + if (!region) + region = new_pmap[j-1]; // horizontal neighbor -00 + else // X1 + { + // this is a right border pixel that connects to an horizontal neighbor + + // this pixel can connect two different regions + alias_set(alias_table, region, new_pmap[j-1]); + } + } + + if (pmap1[j]) // vertical neighbor + { + if (!region) + region = new_pmap1[j]; // isolated vertical neighbor -X- + else // 01 + { + // an horizontal neighbor connects to a vertical neighbor -X- + // X1 + + // this pixel can connect two different regions + alias_set(alias_table, region, new_pmap1[j]); + } + } + else if (region && connect==8 && (has_j1&&pmap1[j+1])) + { + // an horizontal neighbor connects to a right corner neighbor 00X + // X1 + + // this pixel can connect two different regions + alias_set(alias_table, region, new_pmap1[j+1]); + } + + if (connect == 8 && (pmap1[j-1] || (has_j1&&pmap1[j+1])) && !region) // isolated corner + { + // a left corner neighbor or a right corner neighbor X0X + // 01 + + if (pmap1[j-1]) // left corner + region = new_pmap1[j-1]; + + if (pmap1[j+1]) // right corner + { + if (!region) // isolated right corner + region = new_pmap1[j+1]; + else + { + // this pixel can connect two different regions + alias_set(alias_table, new_pmap1[j-1], new_pmap1[j+1]); + } + } + } + + new_pmap[j] = region; + } + else + { + // this pixel touches no pixels + + if (i == height-1 || j == width-1) + new_pmap[j] = 1; + else + { + // create a new region 000 + // 01 + new_pmap[j] = (imushort)region_count; + region_count++; + + if (region_count > MAX_COUNT) + { + delete [] alias_table; + return -1; + } + } + } + } + } + + pmap1 = pmap; + new_pmap1 = new_pmap; + pmap += width; + new_pmap += width; + } + + // now all pixels are marked, + // but some marks are aliases to others + + // ajust the alias table to be a remap table + // and return the real region count + alias_update(alias_table, region_count); + + int count = width*height; + for (i = 0; i < count; i++) + { + new_map[i] = alias_table[new_map[i]]; + } + + delete [] alias_table; + + return region_count; +} + +static int DoAnalyzeFindRegionsBorder(int width, int height, imbyte* map, imushort* new_map, int connect) +{ + int i, j; + + imbyte* pmap1 = map - width; // previous line (line -1 = invalid) + imushort* new_pmap1 = new_map - width; + + imbyte* pmap = map; // current line (line 0) + imushort* new_pmap = new_map; + + int region_count = 2; // still consider: 0- background, 1-border + imushort* alias_table = new imushort [MAX_COUNT]; + memset(alias_table, 0, MAX_COUNT); // aliases are all zero at start (not used) + + for (i = 0; i < height; i++) + { + for (j = 0; j < width; j++) + { + if (pmap[j]) + { + int b01 = j > 0? 1: 0; // valid for pmap[j-1] + int b10 = i > 0? 1: 0; // valid for pmap1[j] + int b11 = i > 0 && j > 0? 1: 0; // valid for pmap1[j-1] + int b12 = i > 0 && j < width-1? 1: 0; // valid for pmap1[j+1] + + if ((b01&&pmap[j-1]) || (b10&&pmap1[j]) || + (connect == 8 && ((b11&&pmap1[j-1]) || (b12&&pmap1[j+1])))) // 4 or 8 connected to the previous neighbors + { + imushort region = 0; + + if (b01&&pmap[j-1]) + { + if (!region) + region = new_pmap[j-1]; // horizontal neighbor -00 + else // X1 + { + // this is a right border pixel that connects to an horizontal neighbor + + // this pixel can connect two different regions + alias_set(alias_table, region, new_pmap[j-1]); + } + } + + if (b10&&pmap1[j]) // vertical neighbor + { + if (!region) + region = new_pmap1[j]; // isolated vertical neighbor -X- + else // 01 + { + // an horizontal neighbor connects to a vertical neighbor -X- + // X1 + + // this pixel can connect two different regions + alias_set(alias_table, region, new_pmap1[j]); + } + } + else if (region && connect == 8 && (b12&&pmap1[j+1])) + { + // an horizontal neighbor connects to a right corner neighbor 00X + // X1 + + // this pixel can connect two different regions + alias_set(alias_table, region, new_pmap1[j+1]); + } + + if (connect == 8 && ((b11&&pmap1[j-1]) || (b12&&pmap1[j+1])) && !region) // isolated corner + { + // a left corner neighbor or a right corner neighbor X0X + // 01 + + if (b11&&pmap1[j-1]) // left corner + region = new_pmap1[j-1]; + + if (b12&&pmap1[j+1]) // right corner + { + if (!region) // isolated right corner + region = new_pmap1[j+1]; + else + { + // this pixel can connect two different regions + alias_set(alias_table, new_pmap1[j-1], new_pmap1[j+1]); + } + } + } + + new_pmap[j] = region; + } + else + { + // this pixel touches no pixels + + // create a new region 000 + // 01 + new_pmap[j] = (imushort)region_count; + region_count++; + + if (region_count > MAX_COUNT) + { + delete [] alias_table; + return -1; + } + } + } + } + + pmap1 = pmap; + new_pmap1 = new_pmap; + pmap += width; + new_pmap += width; + } + + // now all pixels are marked, + // but some marks are aliases to others + + // ajust the alias table to be a remap table + // and return the real region count + alias_update(alias_table, region_count); + + int count = width*height; + for (i = 0; i < count; i++) + { + new_map[i] = alias_table[new_map[i]]; + } + + delete [] alias_table; + + return region_count; +} + +int imAnalyzeFindRegions(const imImage* image, imImage* NewImage, int connect, int touch_border) +{ + imImageSetAttribute(NewImage, "REGION_CONNECT", IM_BYTE, 1, connect==4?"4":"8"); + if (touch_border) + return DoAnalyzeFindRegionsBorder(image->width, image->height, (imbyte*)image->data[0], (imushort*)NewImage->data[0], connect); + else + return DoAnalyzeFindRegions(image->width, image->height, (imbyte*)image->data[0], (imushort*)NewImage->data[0], connect); +} + +void imAnalyzeMeasureArea(const imImage* image, int* data_area, int region_count) +{ + imushort* img_data = (imushort*)image->data[0]; + + memset(data_area, 0, region_count*sizeof(int)); + + for (int i = 0; i < image->count; i++) + { + if (*img_data) + data_area[(*img_data) - 1]++; + img_data++; + } +} + +void imAnalyzeMeasureCentroid(const imImage* image, const int* data_area, int region_count, float* data_cx, float* data_cy) +{ + imushort* img_data = (imushort*)image->data[0]; + int* local_data_area = 0; + + if (!data_area) + { + local_data_area = (int*)malloc(region_count*sizeof(int)); + imAnalyzeMeasureArea(image, local_data_area, region_count); + data_area = (const int*)local_data_area; + } + + if (data_cx) memset(data_cx, 0, region_count*sizeof(float)); + if (data_cy) memset(data_cy, 0, region_count*sizeof(float)); + + for (int y = 0; y < image->height; y++) + { + int offset = y*image->width; + + for (int x = 0; x < image->width; x++) + { + int region_index = img_data[offset+x]; + if (region_index) + { + if (data_cx) data_cx[region_index-1] += (float)x; + if (data_cy) data_cy[region_index-1] += (float)y; + } + } + } + + for (int i = 0; i < region_count; i++) + { + if (data_cx) data_cx[i] /= (float)data_area[i]; + if (data_cy) data_cy[i] /= (float)data_area[i]; + } + + if (local_data_area) + free(local_data_area); +} + +static inline double ipow(double x, int j) +{ + double r = 1.0; + for (int i = 0; i < j; i++) + r *= x; + return r; +} + +static void iCalcMoment(double* cm, int px, int py, const imImage* image, const float* cx, const float* cy, int region_count) +{ + imushort* img_data = (imushort*)image->data[0]; + + memset(cm, 0, region_count*sizeof(double)); + + for (int y = 0; y < image->height; y++) + { + int offset = y*image->width; + + for (int x = 0; x < image->width; x++) + { + int region_index = img_data[offset+x]; + if (region_index) + { + int i = region_index-1; + + if (px == 0) + cm[i] += ipow(y-cy[i],py); + else if (py == 0) + cm[i] += ipow(x-cx[i],px); + else + cm[i] += ipow(x-cx[i],px)*ipow(y-cy[i],py); + } + } + } +} + +template<class T> +static inline int IsPerimeterPoint(T* map, int width, int height, int x, int y) +{ + // map here points to the start of the line, even if its an invalid line. + + // if outside the image, then is not a perimeter line. + if (x == -1 || x == width || + y == -1 || y == height) + return 0; + + T v = map[x]; // here v is image(x,y) + if (!v) + return 0; + + // if touches the border, then is a perimeter line. + if (x == 0 || x == width-1 || + y == 0 || y == height-1) + return 1; + + // if has 4 connected neighbors, then is a perimeter line. + if (map[width+x] != v || + map[x+1] != v || + map[x-1] != v || + map[-width+x] != v) + return 1; + + return 0; +} + +void imAnalyzeMeasurePrincipalAxis(const imImage* image, const int* data_area, const float* data_cx, const float* data_cy, + const int region_count, float* major_slope, float* major_length, + float* minor_slope, float* minor_length) +{ + int i; + int *local_data_area = 0; + float *local_data_cx = 0, *local_data_cy = 0; + + if (!data_area) + { + local_data_area = (int*)malloc(region_count*sizeof(int)); + imAnalyzeMeasureArea(image, local_data_area, region_count); + data_area = (const int*)local_data_area; + } + + if (!data_cx || !data_cy) + { + if (!data_cx) + { + local_data_cx = (float*)malloc(region_count*sizeof(float)); + data_cx = (const float*)local_data_cx; + } + + if (!data_cy) + { + local_data_cy = (float*)malloc(region_count*sizeof(float)); + data_cy = (const float*)local_data_cy; + } + + if (local_data_cx && local_data_cy) + imAnalyzeMeasureCentroid(image, data_area, region_count, local_data_cx, local_data_cy); + else if (local_data_cx) + imAnalyzeMeasureCentroid(image, data_area, region_count, local_data_cx, NULL); + else if (local_data_cy) + imAnalyzeMeasureCentroid(image, data_area, region_count, NULL, local_data_cy); + } + + // additional moments + double* cm20 = (double*)malloc(region_count*sizeof(double)); + double* cm02 = (double*)malloc(region_count*sizeof(double)); + double* cm11 = (double*)malloc(region_count*sizeof(double)); + + iCalcMoment(cm20, 2, 0, image, data_cx, data_cy, region_count); + iCalcMoment(cm02, 0, 2, image, data_cx, data_cy, region_count); + iCalcMoment(cm11, 1, 1, image, data_cx, data_cy, region_count); + + float *local_major_slope = 0, *local_minor_slope = 0; + if (!major_slope) + { + local_major_slope = (float*)malloc(region_count*sizeof(float)); + major_slope = local_major_slope; + } + if (!minor_slope) + { + local_minor_slope = (float*)malloc(region_count*sizeof(float)); + minor_slope = local_minor_slope; + } + +#define RAD2DEG 57.296 + + // We are going to find 2 axis parameters. + // Axis 1 are located in quadrants 1-3 + // Axis 2 are located in quadrants 2-4 + + // Quadrants + // 2 | 1 + // ----- + // 3 | 4 + + // line coeficients for lines that belongs to axis 1 and 2 + float* A1 = (float*)malloc(region_count*sizeof(float)); + float* A2 = (float*)malloc(region_count*sizeof(float)); + float* C1 = (float*)malloc(region_count*sizeof(float)); + float* C2 = (float*)malloc(region_count*sizeof(float)); + + float *slope1 = major_slope; // Use major_slope as a storage place, + float *slope2 = minor_slope; // and create an alias to make code clear. + + for (i = 0; i < region_count; i++) + { + if (cm11[i] == 0) + { + slope1[i] = 0; + slope2[i] = 90; + + // These should not be used + A1[i] = 0; + A2[i] = 0; // infinite + C1[i] = 0; // data_cy[i] + C2[i] = 0; + } + else + { + double b = (cm20[i] - cm02[i])/cm11[i]; + double delta = sqrt(b*b + 4.0); + double r1 = (-b-delta)/2.0; + double r2 = (-b+delta)/2.0; + float a1 = (float)(atan(r1)*RAD2DEG + 90); // to avoid negative results + float a2 = (float)(atan(r2)*RAD2DEG + 90); + + if (a1 == 180) a1 = 0; + if (a2 == 180) a2 = 0; + + if (a1 < 90) // a1 is quadrants q1-q3 + { + slope1[i] = a1; + slope2[i] = a2; + A1[i] = (float)r1; + A2[i] = (float)r2; + } + else // a2 is quadrants q1-q3 + { + slope1[i] = a2; + slope2[i] = a1; + A1[i] = (float)r2; + A2[i] = (float)r1; + } + + C1[i] = data_cy[i] - A1[i] * data_cx[i]; + C2[i] = data_cy[i] - A2[i] * data_cx[i]; + } + } + + // moments are not necessary anymore + free(cm20); free(cm02); free(cm11); + cm20 = 0; cm02 = 0; cm11 = 0; + + // maximum distance from a point in the perimeter to an axis in each side of the axis + // D1 is distance to axis 1, a and b are sides + float* D1a = (float*)malloc(region_count*sizeof(float)); + float* D1b = (float*)malloc(region_count*sizeof(float)); + float* D2a = (float*)malloc(region_count*sizeof(float)); + float* D2b = (float*)malloc(region_count*sizeof(float)); + memset(D1a, 0, region_count*sizeof(float)); + memset(D1b, 0, region_count*sizeof(float)); + memset(D2a, 0, region_count*sizeof(float)); + memset(D2b, 0, region_count*sizeof(float)); + + imushort* img_data = (imushort*)image->data[0]; + int width = image->width; + int height = image->height; + for (int y = 0; y < height; y++) + { + int offset = y*width; + + for (int x = 0; x < width; x++) + { + if (IsPerimeterPoint(img_data+offset, width, height, x, y)) + { + i = img_data[offset+x] - 1; + + float d1, d2; + if (slope2[i] == 90) + { + d2 = y - data_cy[i]; // I ckecked this many times, looks odd but it is correct. + d1 = x - data_cx[i]; + } + else + { + d1 = A1[i]*x - y + C1[i]; + d2 = A2[i]*x - y + C2[i]; + } + + if (d1 < 0) + { + d1 = (float)fabs(d1); + if (d1 > D1a[i]) + D1a[i] = d1; + } + else + { + if (d1 > D1b[i]) + D1b[i] = d1; + } + + if (d2 < 0) + { + d2 = (float)fabs(d2); + if (d2 > D2a[i]) + D2a[i] = d2; + } + else + { + if (d2 > D2b[i]) + D2b[i] = d2; + } + } + } + } + + for (i = 0; i < region_count; i++) + { + float AB1 = (float)sqrt(A1[i]*A1[i] + 1); + float AB2 = (float)sqrt(A2[i]*A2[i] + 1); + + float D1 = (D1a[i] + D1b[i]) / AB1; + float D2 = (D2a[i] + D2b[i]) / AB2; + + if (D1 < D2) // Major Axis in 2-4 quadrants + { + // now remember that we did an alias before + // slope1 -> major_slope + // slope2 -> minor_slope + + float tmp = major_slope[i]; + major_slope[i] = minor_slope[i]; + minor_slope[i] = tmp; + + if (minor_length) minor_length[i] = D1; + if (major_length) major_length[i] = D2; + } + else + { + if (minor_length) minor_length[i] = D2; + if (major_length) major_length[i] = D1; + } + } + + if (local_major_slope) free(local_major_slope); + if (local_minor_slope) free(local_minor_slope); + if (local_data_area) free(local_data_area); + if (local_data_cx) free(local_data_cx); + if (local_data_cy) free(local_data_cy); + + free(A1); + free(A2); + free(C1); + free(C2); + + free(D1b); + free(D2b); + free(D1a); + free(D2a); +} + +void imAnalyzeMeasureHoles(const imImage* image, int connect, int* count_data, int* area_data, float* perim_data) +{ + int i; + imImage *inv_image = imImageCreate(image->width, image->height, IM_BINARY, IM_BYTE); + imbyte* inv_data = (imbyte*)inv_image->data[0]; + imushort* img_data = (imushort*)image->data[0]; + + // finds the holes in the inverted image + for (i = 0; i < image->count; i++) + { + if (*img_data) + *inv_data = 0; + else + *inv_data = 1; + + img_data++; + inv_data++; + } + + imImage *holes_image = imImageClone(image); + if (!holes_image) + return; + + int holes_count = imAnalyzeFindRegions(inv_image, holes_image, connect, 0); + imImageDestroy(inv_image); + + if (!holes_count) + { + imImageDestroy(holes_image); + return; + } + + // measure the holes area + int* holes_area = (int*)malloc(holes_count*sizeof(int)); + imAnalyzeMeasureArea(holes_image, holes_area, holes_count); + + float* holes_perim = 0; + if (perim_data) + { + holes_perim = (float*)malloc(holes_count*sizeof(int)); + imAnalyzeMeasurePerimeter(holes_image, holes_perim, holes_count); + } + + imushort* holes_data = (imushort*)holes_image->data[0]; + img_data = (imushort*)image->data[0]; + + // holes do not touch the border + for (int y = 1; y < image->height-1; y++) + { + int offset_up = (y+1)*image->width; + int offset = y*image->width; + int offset_dw = (y-1)*image->width; + + for (int x = 1; x < image->width-1; x++) + { + int hole_index = holes_data[offset+x]; + + if (hole_index && holes_area[hole_index-1]) // a hole not yet used + { + // if the hole has not been used, + // it is the first time we encounter a pixel of this hole. + // then it is a pixel from the hole border. + // now find which region this hole is inside. + // a 4 connected neighbour is necessarilly a valid region or 0. + + int region_index = 0; + if (img_data[offset_up + x]) region_index = img_data[offset_up + x]; + else if (img_data[offset + x+1]) region_index = img_data[offset + x+1]; + else if (img_data[offset + x-1]) region_index = img_data[offset + x-1]; + else if (img_data[offset_dw+x]) region_index = img_data[offset_dw+x]; + + if (!region_index) continue; + + if (count_data) count_data[region_index-1]++; + if (area_data) area_data[region_index-1] += holes_area[hole_index-1]; + if (perim_data) perim_data[region_index-1] += holes_perim[hole_index-1]; + holes_area[hole_index-1] = 0; // mark hole as used + } + } + } + + if (holes_perim) free(holes_perim); + free(holes_area); + imImageDestroy(holes_image); +} + +template<class T> +static void DoPerimeterLine(T* map, T* new_map, int width, int height) +{ + int x, y, offset; + + for (y = 0; y < height; y++) + { + offset = y*width; + + for (x = 0; x < width; x++) + { + if (IsPerimeterPoint(map+offset, width, height, x, y)) + new_map[offset+x] = map[offset+x]; + else + new_map[offset+x] = 0; + } + } +} + +void imProcessPerimeterLine(const imImage* src_image, imImage* dst_image) +{ + switch(src_image->data_type) + { + case IM_BYTE: + DoPerimeterLine((imbyte*)src_image->data[0], (imbyte*)dst_image->data[0], src_image->width, src_image->height); + break; + case IM_USHORT: + DoPerimeterLine((imushort*)src_image->data[0], (imushort*)dst_image->data[0], src_image->width, src_image->height); + break; + case IM_INT: + DoPerimeterLine((int*)src_image->data[0], (int*)dst_image->data[0], src_image->width, src_image->height); + break; + } +} + +/* Perimeter Templates idea based in + Parker, Pratical Computer Vision Using C + +For 1.414 (sqrt(2)/2 + sqrt(2)/2) [1]: + 1 0 0 0 0 1 1 0 0 0 0 1 0 0 0 1 0 1 + 0 x 0 0 x 0 0 x 0 0 x 0 0 x 0 0 x 0 + 0 0 1 1 0 0 1 0 0 0 0 1 1 0 1 0 0 0 + 129 36 132 33 5 160 + +For 1.207 (sqrt(2)/2 + 1.0/2) [2]: + 0 0 0 0 0 1 0 1 0 0 1 0 1 0 0 0 0 1 0 0 0 1 0 0 + 1 x 0 1 x 0 0 x 0 0 x 0 0 x 0 0 x 0 0 x 1 0 x 1 + 0 0 1 0 0 0 1 0 0 0 0 1 0 1 0 0 1 0 1 0 0 0 0 0 + 17 48 68 65 130 34 12 136 + + 0 0 0 1 0 0 1 1 0 0 1 1 0 0 1 0 0 0 0 0 0 0 0 0 + 1 x 0 1 x 0 0 x 0 0 x 0 0 x 1 0 x 1 0 x 0 0 x 0 + 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 1 1 1 0 + 20 144 192 96 40 9 3 6 + +For 1.0 (1.0/2 + 1.0/2) [0]: + 0 0 0 0 1 0 0 0 0 0 0 0 0 1 0 0 1 0 + 1 x 1 0 x 0 1 x 0 0 x 1 1 x 0 0 x 1 + 0 0 0 0 1 0 0 1 0 0 1 0 0 0 0 0 0 0 + 24 66 18 10 80 72 + +For 0.707 (sqrt(2)/2) [3]: + 1 0 0 0 0 1 0 0 0 0 0 0 + 0 x 0 0 x 0 0 x 0 0 x 0 (For Line Length) + 0 0 0 0 0 0 0 0 1 1 0 0 + 128 32 1 4 + +For 0.5 (1.0/2) [4]: + 0 1 0 0 0 0 0 0 0 0 0 0 + 0 x 0 0 x 1 0 x 0 1 x 0 (For Line Length) + 0 0 0 0 0 0 0 1 0 0 0 0 + 64 8 2 16 + +*/ +static void iInitPerimTemplate(imbyte *templ, float *v) +{ + memset(templ, 0, 256); + + templ[129] = 1; + templ[36] = 1; + templ[132] = 1; + templ[33] = 1; + templ[5] = 1; + templ[160] = 1; + + templ[17] = 2; + templ[48] = 2; + templ[68] = 2; + templ[65] = 2; + templ[130] = 2; + templ[34] = 2; + templ[12] = 2; + templ[136] = 2; + templ[20] = 2; + templ[144] = 2; + templ[192] = 2; + templ[96] = 2; + templ[40] = 2; + templ[9] = 2; + templ[3] = 2; + templ[6] = 2; + + templ[24] = 0; + templ[66] = 0; + templ[18] = 0; + templ[10] = 0; + templ[80] = 0; + templ[72] = 0; + + templ[128] = 3; + templ[32] = 3; + templ[1] = 3; + templ[4] = 3; + + templ[64] = 4; + templ[8] = 4; + templ[2] = 4; + templ[16] = 4; + +const float DT_SQRT2 = 1.414213562373f; +const float DT_SQRT2D2 = 0.707106781187f; + + v[1] = DT_SQRT2; + v[2] = DT_SQRT2D2 + 0.5f; + v[0] = 1.0f; + v[3] = DT_SQRT2D2; + v[4] = 0.5f; +} + +void imAnalyzeMeasurePerimeter(const imImage* image, float* perim_data, int region_count) +{ + static imbyte templ[256]; + static float vt[5]; + static int first = 1; + if (first) + { + iInitPerimTemplate(templ, vt); + first = 0; + } + + imushort* map = (imushort*)image->data[0]; + + memset(perim_data, 0, region_count*sizeof(int)); + + int width = image->width; + int height = image->height; + for (int y = 0; y < height; y++) + { + int offset = y*image->width; + + for (int x = 0; x < width; x++) + { + if (IsPerimeterPoint(map+offset, width, height, x, y)) + { + int T = 0; + + // check the 8 neighboors if they belong to the perimeter + if (IsPerimeterPoint(map+offset+width, width, height, x-1, y+1)) + T |= 0x01; + if (IsPerimeterPoint(map+offset+width, width, height, x, y+1)) + T |= 0x02; + if (IsPerimeterPoint(map+offset+width, width, height, x+1, y+1)) + T |= 0x04; + + if (IsPerimeterPoint(map+offset, width, height, x-1, y)) + T |= 0x08; + if (IsPerimeterPoint(map+offset, width, height, x+1, y)) + T |= 0x10; + + if (IsPerimeterPoint(map+offset-width, width, height, x-1, y-1)) + T |= 0x20; + if (IsPerimeterPoint(map+offset-width, width, height, x, y-1)) + T |= 0x40; + if (IsPerimeterPoint(map+offset-width, width, height, x+1, y-1)) + T |= 0x80; + + if (T) + perim_data[map[offset+x] - 1] += vt[templ[T]]; + } + } + } +} + +/* Perimeter Area Templates + +For "1.0" (0): + + 1 1 1 + 1 x 1 + 1 1 1 + 255 + +For "0.75" (1): + + 1 1 1 1 1 1 0 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 0 1 + 1 x 1 1 x 1 1 x 1 1 x 1 0 x 1 1 x 0 1 x 1 1 x 1 + 0 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 1 1 1 + 251 254 127 223 239 247 253 191 + +For "0.625" (2): + + 1 1 1 0 0 1 0 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 0 0 + 1 x 1 1 x 1 0 x 1 1 x 0 0 x 1 1 x 0 1 x 1 1 x 1 + 0 0 1 1 1 1 1 1 1 1 1 1 0 1 1 1 1 0 1 0 0 1 1 1 + 249 63 111 215 235 246 252 159 + +For "0.5" (3): + + 0 0 0 0 1 1 1 1 1 1 1 0 1 1 1 0 0 1 1 0 0 1 1 1 + 1 x 1 0 x 1 1 x 1 1 x 0 0 x 1 0 x 1 1 x 0 1 x 0 + 1 1 1 0 1 1 0 0 0 1 1 0 0 0 1 1 1 1 1 1 1 1 0 0 + 31 107 248 214 233 47 151 244 + +For "0.375" (4): + + 0 0 0 1 1 1 1 1 0 0 1 1 1 0 0 0 0 1 0 0 0 1 1 1 + 1 x 0 1 x 0 1 x 0 0 x 1 1 x 0 0 x 1 0 x 1 0 x 1 + 1 1 1 0 0 0 1 0 0 0 0 1 1 1 0 0 1 1 1 1 1 0 0 0 + 23 240 212 105 150 43 15 232 + +For "0.25" (5): + + 0 0 0 0 0 0 1 1 0 0 1 1 1 0 0 0 0 1 0 0 0 1 1 1 + 1 x 0 0 x 1 1 x 0 0 x 1 1 x 0 0 x 1 0 x 0 0 x 0 + 1 1 0 0 1 1 0 0 0 0 0 0 1 0 0 0 0 1 1 1 1 0 0 0 + 22 11 208 104 148 41 7 224 + +For "0.125" (6): + + 0 0 0 0 0 0 1 1 0 0 0 1 1 0 0 0 0 0 0 0 0 0 1 1 + 1 x 0 0 x 0 0 x 0 0 x 1 1 x 0 0 x 1 0 x 0 0 x 0 + 1 0 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 1 1 1 0 0 0 0 + 20 3 192 40 144 9 6 96 + +*/ +static void iInitPerimAreaTemplate(imbyte *templ, float *v) +{ + memset(templ, 0, 256); + + templ[255] = 0; + + templ[251] = 1; + templ[254] = 1; + templ[127] = 1; + templ[223] = 1; + templ[239] = 1; + templ[247] = 1; + templ[253] = 1; + templ[191] = 1; + + templ[249] = 2; + templ[63] = 2; + templ[111] = 2; + templ[215] = 2; + templ[235] = 2; + templ[246] = 2; + templ[252] = 2; + templ[159] = 2; + + templ[31] = 3; + templ[107] = 3; + templ[248] = 3; + templ[214] = 3; + templ[233] = 3; + templ[47] = 3; + templ[151] = 3; + templ[244] = 3; + + templ[23] = 4; + templ[240] = 4; + templ[212] = 4; + templ[105] = 4; + templ[150] = 4; + templ[43] = 4; + templ[15] = 4; + templ[232] = 4; + + templ[22] = 5; + templ[11] = 5; + templ[208] = 5; + templ[104] = 5; + templ[148] = 5; + templ[41] = 5; + templ[7] = 5; + templ[224] = 5; + + templ[20] = 6; + templ[3] = 6; + templ[192] = 6; + templ[40] = 6; + templ[144] = 6; + templ[9] = 6; + templ[6] = 6; + templ[96] = 6; + + v[0] = 1.0f; + v[1] = 0.75f; + v[2] = 0.625f; + v[3] = 0.5f; + v[4] = 0.375f; + v[5] = 0.25f; + v[6] = 0.125f; +} + +void imAnalyzeMeasurePerimArea(const imImage* image, float* area_data) +{ + static imbyte templ[256]; + static float vt[7]; + static int first = 1; + if (first) + { + iInitPerimAreaTemplate(templ, vt); + first = 0; + } + + imushort* map = (imushort*)image->data[0]; + + int width = image->width; + int height = image->height; + for (int y = 0; y < height; y++) + { + int offset_up = (y+1)*width; + int offset = y*width; + int offset_dw = (y-1)*width; + + for (int x = 0; x < width; x++) + { + imushort v = map[offset+x]; + if (v) + { + int T = 0; + if (x>0 && y<height-1 && map[offset_up + x-1] == v) T |= 0x01; + if (y<height-1 && map[offset_up + x ] == v) T |= 0x02; + if (x<width-1 && y<height-1 && map[offset_up + x+1] == v) T |= 0x04; + if (x>0 && map[offset + x-1] == v) T |= 0x08; + if (x<width-1 && map[offset + x+1] == v) T |= 0x10; + if (x>0 && y>0 && map[offset_dw + x-1] == v) T |= 0x20; + if (y>0 && map[offset_dw + x ] == v) T |= 0x40; + if (x<width-1 && y>0 && map[offset_dw + x+1] == v) T |= 0x80; + + if (T) + area_data[v-1] += vt[templ[T]]; + } + } + } +} + +void imProcessPrune(const imImage* image, imImage* NewImage, int connect, int start_size, int end_size) +{ + imImage *region_image = imImageCreate(image->width, image->height, IM_GRAY, IM_USHORT); + if (!region_image) + return; + + int region_count = imAnalyzeFindRegions(image, region_image, connect, 1); + if (!region_count) + { + imImageClear(NewImage); + imImageDestroy(region_image); + return; + } + + int* area_data = (int*)malloc(region_count*sizeof(int)); + imAnalyzeMeasureArea(region_image, area_data, region_count); + + imushort* region_data = (imushort*)region_image->data[0]; + imbyte* img_data = (imbyte*)NewImage->data[0]; + + for (int i = 0; i < image->count; i++) + { + if (*region_data) + { + int area = area_data[(*region_data) - 1]; + if (area < start_size || (end_size && area > end_size)) + *img_data = 0; + else + *img_data = 1; + } + else + *img_data = 0; + + region_data++; + img_data++; + } + + free(area_data); + imImageDestroy(region_image); +} + +void imProcessFillHoles(const imImage* image, imImage* NewImage, int connect) +{ + // finding regions in the inverted image will isolate only the holes. + imProcessNegative(image, NewImage); + + imImage *region_image = imImageCreate(image->width, image->height, IM_GRAY, IM_USHORT); + if (!region_image) + return; + + int holes_count = imAnalyzeFindRegions(NewImage, region_image, connect, 0); + if (!holes_count) + { + imImageCopy(image, NewImage); + imImageDestroy(region_image); + return; + } + + imushort* region_data = (imushort*)region_image->data[0]; + imbyte* dst_data = (imbyte*)NewImage->data[0]; + + for (int i = 0; i < image->count; i++) + { + if (*region_data) + *dst_data = 1; + else + *dst_data = !(*dst_data); // Fix negative data. + + region_data++; + dst_data++; + } + + imImageDestroy(region_image); +} |