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alg1.c
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alg1.c
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/* ############################################################################
Name : alg1.c
Company : S. Vagionitis
Project : Finding Clones
Programmer : S. Vagionitis
Revisor : S. Vagionitis
Description : Functions for Algorithm 1. Implementation of the algorithm
described in
Jiang J.-A., Chang H.-Y., Wu K.-H., Ouyang C.-S., Yang M.-M.,
Yang E.-C., Chen T.-W., Lin T.-T. An adaptive image
segmentation algorithm for X-ray quarantine inspection of
selected fruits (2008) Computers and Electronics in Agriculture,
60 (2), pp. 190-200.
Procedure Description
========================================= =====================================
create_sub_images
free_mem_subimages
export_ppm_subimages
calculate_histogram
free_mem_histogram
calculate_threshold
calculate_min_max_hist_threshold
basic_global_thresholding_algorithm
calculate_threshold_with_interpolation
bilinear_interpolation_with_weights_...
propotional_to_square_of_distance
bilinear_interpolation_with_weights_...
propotional_to_distance
linear_interpolation_in_2d_data
Globals Type Description
===================== =================== =====================================
subimage_data unsigned char ***** Subimages data.
[Width-coodinate of subimage]
[Height-Coordinate of subimage]
[x-coordinate in subimage]
[y-cooddinate in subimage]
[0: Red from RGB value
1: Green from RGB value
2: Blue from RGB value
3: Grey value
4: Threshold value]
hist_data histogram *** Histogram from subimages.
Ts unsigned char ** Calculate one threshold per subimage.
Programmer Date Action
============== ============== =================================================
S. Vagionitis 10/06/2010 Creation
############################################################################ */
#define __ALG1_C__
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <time.h>
#include <limits.h>/*UINT_MAX*/
#include "alg1.h"
#include "alcon2009.h"/*For save_ppm function*/
#include "morphological_operations.h"
unsigned char *****subimage_data;
histogram ***hist_data;
unsigned char **Ts;
int Calculate_Block_Size(unsigned int HeightBlockIndex, unsigned int WidthBlockIndex, int height, int width, unsigned int *HeightBlockSize, unsigned int *WidthBlockSize)
{
unsigned int HeightBlockStart = HeightBlockIndex * SHIFT;
unsigned int WidthBlockStart = WidthBlockIndex * SHIFT;
if ((HeightBlockStart + M) <= height)
(*HeightBlockSize) = M;
else
(*HeightBlockSize) = height - HeightBlockStart;
if ((WidthBlockStart + M) <= width)
(*WidthBlockSize) = M;
else
(*WidthBlockSize) = width - WidthBlockStart;
return TRUE;
}
/* ############################################################################
Name : create_sub_images
Description : Take as input the original image and create the subimages
according to the algorithm of the paper. The subimages are
colored.
Arguments Type Description
===================== =================== =====================================
image_data(IN) unsigned char * Image data.
width(IN) int Width of image.
height(IN) int Height of image.
width_subimages(OUT) unsigned int* Width coordinate of subimage.
height_subimages(OUT) unsigned int* Height coordinate of subimage.
Return Values Description
========================================= =====================================
TRUE If all goes well.
FALSE If memory allocation fails.
Globals Type Description
===================== =================== =====================================
subimage_data(IN) unsigned char ***** Subimages data.
[Width-coodinate of subimage]
[Height-Coordinate of subimage]
[x-coordinate in subimage]
[y-cooddinate in subimage]
[0: Red from RGB value
1: Green from RGB value
2: Blue from RGB value
3: Grey value
4: Threshold value]
Locals Type Description
===================== =================== =====================================
i, j, k, l, m unsigned int General purpose indexes.
r, g, b unsigned char RGB values.
h_mem_alloc unsigned int The maximum height of the subimage.
w_mem_alloc unsigned int The maximum width of the subimage.
############################################################################ */
int create_sub_images(unsigned char *image_data, int width, int height, unsigned int *width_subimages, unsigned int *height_subimages)
{
unsigned int i = 0, j = 0, k = 0, l = 0, m = 0;
unsigned int HeightBlockSize = 0;
unsigned int WidthBlockSize = 0;
unsigned int SdM = (SHIFT / M);
if (WIDTH_MOD_SHIFT(width, SHIFT))
(*width_subimages) = WIDTH_DIV_SHIFT(width, SHIFT) + SdM;
else
(*width_subimages) = WIDTH_DIV_SHIFT(width, SHIFT);
if (HEIGHT_MOD_SHIFT(height, SHIFT))
(*height_subimages) = HEIGHT_DIV_SHIFT(height, SHIFT) + SdM;
else
(*height_subimages) = HEIGHT_DIV_SHIFT(height, SHIFT);
unsigned int sub_hei = (*height_subimages);
unsigned int sub_wid = (*width_subimages);
#if ALLOW_PRINTF == TRUE
printf("SHIFT= %d, Width= %d, Height= %d, Width_Sub= %d, Height_Sub= %d Width_Mod= %d Height_Mod= %d\n", SHIFT, width, height, sub_wid, sub_hei, WIDTH_MOD_SHIFT(width, SHIFT), HEIGHT_MOD_SHIFT(height, SHIFT));
#endif
/* Allocate memory for subimage data*/
subimage_data = (unsigned char *****)malloc(sub_hei * sizeof(unsigned char ****));
if (subimage_data == NULL){
printf("Could not allocate %d bytes.\n", (sub_hei * sizeof(unsigned char ****)));
return FALSE;
}
else{
for (i=0;i<sub_hei;i++){
subimage_data[i] = (unsigned char ****)malloc(sub_wid * sizeof(unsigned char ***));
if (subimage_data[i] == NULL){
printf("Could not allocate %d bytes for i=%d index.\n", (sub_wid * sizeof(unsigned char ***)), i);
return FALSE;
}
else{
for (j=0;j<sub_wid;j++){
/*------------------------------------------------*/
Calculate_Block_Size(i, j, height, width, &HeightBlockSize, &WidthBlockSize);
/*------------------------------------------------*/
subimage_data[i][j] = (unsigned char ***)malloc(HeightBlockSize * sizeof(unsigned char **));
if (subimage_data[i][j] == NULL){
printf("Could not allocate %d bytes for j=%d index.\n", (HeightBlockSize * sizeof(unsigned char **)), j);
return FALSE;
}
else{
for(k=0;k<HeightBlockSize;k++){
subimage_data[i][j][k] = (unsigned char **)malloc(WidthBlockSize * sizeof(unsigned char *));
if (subimage_data[i][j][k] == NULL){
printf("Could not allocate %d bytes for k=%d index.\n", (WidthBlockSize * sizeof(unsigned char)), k);
return FALSE;
}
else{
for(l=0;l<WidthBlockSize;l++){
subimage_data[i][j][k][l] = (unsigned char *)malloc(5 * sizeof(unsigned char));
if (subimage_data[i][j][k][l] == NULL){
printf("Could not allocate %d bytes for l=%d index.\n", (5 * sizeof(unsigned char)), l);
return FALSE;
}
else{
/*Initialize subimage data.*/
for(m=0;m<5;m++){
subimage_data[i][j][k][l][m] = 0;
}
}
}/*for l*/
}/*else subimage_data[i][j][k]*/
}/*for k*/
}/*else subimage_data[i][j]*/
}/*for j*/
}/*else subimage_data[i]*/
}/*for i*/
}/*else subimage_data*/
/* Populate subimage data*/
for(i=0;i<sub_hei;i++){/*Height coordinate of subimage*/
unsigned int HeightBlockStart = i * SHIFT;
for (j=0;j<sub_wid;j++){/*Width coordinate of subimage*/
unsigned int WidthBlockStart = j * SHIFT;
/*------------------------------------------------*/
Calculate_Block_Size(i, j, height, width, &HeightBlockSize, &WidthBlockSize);
/*------------------------------------------------*/
for(k=0;k<HeightBlockSize;k++){
unsigned int x = (k + HeightBlockStart);
for(l=0;l<WidthBlockSize;l++){
unsigned char r = 0, g = 0, b = 0;
unsigned int y = (l + WidthBlockStart);
register unsigned int xyM = (y + x * (width)) * 3;
r = subimage_data[i][j][k][l][0] = image_data[xyM + 0];
g = subimage_data[i][j][k][l][1] = image_data[xyM + 1];
b = subimage_data[i][j][k][l][2] = image_data[xyM + 2];
subimage_data[i][j][k][l][3] = GREYSCALE1(r, g, b);
}/*l*/
}/*k*/
}/*j*/
}/*i*/
return TRUE;
}
/* ############################################################################
Name : free_mem_subimages
Description : Free memory from subimages.
Arguments Type Description
===================== =================== =====================================
width(IN) int Width of image.
height(IN) int Height of image.
width_subimages(IN) unsigned int Width coordinate of subimage.
height_subimages(IN) unsigned int Height coordinate of subimage.
Return Values Description
========================================= =====================================
TRUE If all goes well.
Globals Type Description
===================== =================== =====================================
subimage_data(IN) unsigned char ***** Subimages data.
[Width-coodinate of subimage]
[Height-Coordinate of subimage]
[x-coordinate in subimage]
[y-cooddinate in subimage]
[0: Red from RGB value
1: Green from RGB value
2: Blue from RGB value
3: Grey value
4: Threshold value]
Locals Type Description
===================== =================== =====================================
i, j, k, l, m unsigned int General purpose indexes.
HeightBlockSize unsigned int The maximum height of the subimage.
WidthBlockSize unsigned int The maximum width of the subimage.
############################################################################ */
int free_mem_subimages(int width, int height, unsigned int width_subimages, unsigned int height_subimages)
{
unsigned int i = 0, j = 0, k = 0, l = 0;
unsigned int HeightBlockSize = 0;
unsigned int WidthBlockSize = 0;
for (i=0;i<height_subimages;i++){
for (j=0;j<width_subimages;j++){
/*------------------------------------------------*/
Calculate_Block_Size(i, j, height, width, &HeightBlockSize, &WidthBlockSize);
/*------------------------------------------------*/
for(k=0;k<HeightBlockSize;k++){
for(l=0;l<WidthBlockSize;l++){
free(subimage_data[i][j][k][l]);
}
free(subimage_data[i][j][k]);
}
free(subimage_data[i][j]);
}
free(subimage_data[i]);
}
free(subimage_data);
return TRUE;
}
/* ############################################################################
Name : export_ppm_subimages
Description : Take as input the original image and create the subimages
according to the algorithm of the paper. The subimages are
colored.
Arguments Type Description
===================== =================== =====================================
type(IN) unsigned char 0 for red value pixels
1 for green value pixels
2 for blue value pixels
3 for grey value pixels
4 for RGB value pixels
5 for threshold values
width(IN) int Width of image.
height(IN) int Height of image.
width_subimages(IN) unsigned int* Width coordinate of subimage.
height_subimages(IN) unsigned int* Height coordinate of subimage.
Return Values Description
========================================= =====================================
TRUE If all goes well.
FALSE If memory allocation fails.
Globals Type Description
===================== =================== =====================================
subimage_data(IN) unsigned char ***** Subimages data.
[Width-coodinate of subimage]
[Height-Coordinate of subimage]
[x-coordinate in subimage]
[y-cooddinate in subimage]
[0: Red from RGB value
1: Green from RGB value
2: Blue from RGB value
3: Grey value
4: Threshold value]
Locals Type Description
===================== =================== =====================================
i, j, k, l, m unsigned int General purpose indexes.
HeightBlockSize unsigned int The maximum height of the subimage.
WidthBlockSize unsigned int The maximum width of the subimage.
############################################################################ */
int export_ppm_subimages(unsigned char type, int width, int height, unsigned int width_subimages, unsigned int height_subimages)
{
unsigned int i = 0, j = 0, k = 0, l = 0;
unsigned int HeightBlockSize = 0;
unsigned int WidthBlockSize = 0;
unsigned int data_mem_alloc = 0;
char filename[128];
memset(filename, '\0', sizeof(filename));
unsigned char *data_buffer=NULL;
data_mem_alloc = (3 * M * M);
data_buffer = (unsigned char *)malloc(data_mem_alloc * sizeof(unsigned char));
if (data_buffer == NULL){
printf("Could not allocate %d bytes.\n", (data_mem_alloc * sizeof(unsigned char)));
return FALSE;
}
else{/*Initialize data buffer*/
for(i=0;i<data_mem_alloc;i++)
data_buffer[i] = 0;
}
for(i=0;i<height_subimages;i++){/*Height coordinate of subimage*/
for (j=0;j<width_subimages;j++){/*Width coordinate of subimage*/
/*------------------------------------------------*/
Calculate_Block_Size(i, j, height, width, &HeightBlockSize, &WidthBlockSize);
/*------------------------------------------------*/
for(k=0;k<HeightBlockSize;k++){
for(l=0;l<WidthBlockSize;l++){
register unsigned int lkwma = (l + k*WidthBlockSize)*3;
switch(type){
case 0:/*Red values*/
data_buffer[lkwma + 0] = subimage_data[i][j][k][l][0];
data_buffer[lkwma + 1] = 0;
data_buffer[lkwma + 2] = 0;
sprintf(filename,"%s_%03u_%03u_RedSubimage[%02ux%02u].ppm",output_fn, i, j, HeightBlockSize, WidthBlockSize);
break;
case 1:/*Green values*/
data_buffer[lkwma + 0] = 0;
data_buffer[lkwma + 1] = subimage_data[i][j][k][l][1];
data_buffer[lkwma + 2] = 0;
sprintf(filename,"%s_%03u_%03u_GreenSubimage[%02ux%02u].ppm",output_fn, i, j, HeightBlockSize, WidthBlockSize);
break;
case 2:/*Blue values*/
data_buffer[lkwma + 0] = 0;
data_buffer[lkwma + 1] = 0;
data_buffer[lkwma + 2] = subimage_data[i][j][k][l][2];
sprintf(filename,"%s_%03u_%03u_BlueSubimage[%02ux%02u].ppm",output_fn, i, j, HeightBlockSize, WidthBlockSize);
break;
case 3:/*Grey values*/
data_buffer[lkwma + 0] = subimage_data[i][j][k][l][3];
data_buffer[lkwma + 1] = subimage_data[i][j][k][l][3];
data_buffer[lkwma + 2] = subimage_data[i][j][k][l][3];
sprintf(filename,"%s_%03u_%03u_GreySubimage[%02ux%02u].ppm",output_fn, i, j, HeightBlockSize, WidthBlockSize);
break;
case 4:/*RGB values*/
data_buffer[lkwma + 0] = subimage_data[i][j][k][l][0];
data_buffer[lkwma + 1] = subimage_data[i][j][k][l][1];
data_buffer[lkwma + 2] = subimage_data[i][j][k][l][2];
sprintf(filename,"%s_%03u_%03u_Subimage[%02ux%02u].ppm",output_fn, i, j, HeightBlockSize, WidthBlockSize);
break;
case 5:/*Threshold values*/
data_buffer[lkwma + 0] = subimage_data[i][j][k][l][4];
data_buffer[lkwma + 1] = subimage_data[i][j][k][l][4];
data_buffer[lkwma + 2] = subimage_data[i][j][k][l][4];
sprintf(filename,"%s_%03u_%03u_ThresholdSubimage[%02ux%02u].ppm",output_fn, i, j, HeightBlockSize, WidthBlockSize);
break;
}
}/*l*/
}/*k*/
save_ppm(filename, WidthBlockSize, HeightBlockSize, data_buffer);
}/*j*/
}/*i*/
free(data_buffer);
return TRUE;
}
/* ############################################################################
Name : calculate_histogram
Description : Calculate the histogram for each subimage.
Arguments Type Description
===================== =================== =====================================
type(IN) unsigned char 0 for red value pixels
1 for green value pixels
2 for blue value pixels
3 for grey value pixels
width(IN) int Width of image.
height(IN) int Height of image.
width_subimages(IN) unsigned int Width coordinate of subimage.
height_subimages(IN) unsigned int Height coordinate of subimage.
Return Values Description
========================================= =====================================
TRUE If all goes well.
FALSE If memory allocation fails.
Globals Type Description
===================== =================== =====================================
subimage_data(IN) unsigned char ***** Subimages data.
[Width-coodinate of subimage]
[Height-Coordinate of subimage]
[x-coordinate in subimage]
[y-cooddinate in subimage]
[0: Red from RGB value
1: Green from RGB value
2: Blue from RGB value
3: Grey value
4: Threshold value]
hist_data(OUT) histogram *** Histogram from subimages.
Locals Type Description
===================== =================== =====================================
i, j, k, l unsigned int General purpose indexes.
HeightBlockSize unsigned int The maximum height of the subimage.
WidthBlockSize unsigned int The maximum width of the subimage.
r, g, b unsigned char RGB values.
gry unsigned char Grey value.
############################################################################ */
int calculate_histogram(unsigned char type, int width, int height, unsigned int width_subimages, unsigned int height_subimages)
{
unsigned int i = 0, j = 0, k = 0, l = 0, m = 0;
unsigned int HeightBlockSize = 0;
unsigned int WidthBlockSize = 0;
unsigned int pixel_value_counter[COLORS], max_pixels = 0;
memset(pixel_value_counter, 0, sizeof(pixel_value_counter));
/* Allocate memory for histogram data*/
hist_data = (histogram ***)malloc(height_subimages * sizeof(histogram **));
if (hist_data == NULL){
printf("Could not allocate %d bytes.\n", (height_subimages * sizeof(histogram **)));
return FALSE;
}
else{
for (i=0;i<height_subimages;i++){
hist_data[i] = (histogram **)malloc(width_subimages * sizeof(histogram *));
if (hist_data[i] == NULL){
printf("Could not allocate %d bytes for i=%d index.\n", (width_subimages * sizeof(histogram *)), i);
return FALSE;
}
else{
for (j=0;j<width_subimages;j++){
hist_data[i][j] = (histogram *)malloc(COLORS * sizeof(histogram));
if (hist_data[i][j] == NULL){
printf("Could not allocate %d bytes for j=%d index.\n", (COLORS * sizeof(histogram)), j);
return FALSE;
}
else{
for(k=0;k<COLORS;k++){
hist_data[i][j][k].num_pixels = 0;
hist_data[i][j][k].freq = 0.0;
}/*for k*/
}/*else hist_data[i][j]*/
}/*for j*/
}/*else hist_data[i]*/
}/*for i*/
}/*else hist_data*/
for (i=0;i<height_subimages;i++){
for (j=0;j<width_subimages;j++){
/*------------------------------------------------*/
Calculate_Block_Size(i, j, height, width, &HeightBlockSize, &WidthBlockSize);
/*------------------------------------------------*/
memset(pixel_value_counter, 0, sizeof(pixel_value_counter));
for(k=0;k<HeightBlockSize;k++){
max_pixels = (HeightBlockSize*WidthBlockSize);
for(l=0;l<WidthBlockSize;l++){
switch(type){
unsigned char r = 0, g = 0, b = 0, gry = 0;
case 0:/*Red Histogram*/
r = subimage_data[i][j][k][l][0];
pixel_value_counter[r]++;
break;
case 1:/*Green Histogram*/
g = subimage_data[i][j][k][l][1];
pixel_value_counter[g]++;
break;
case 2:/*Blue Histogram*/
b = subimage_data[i][j][k][l][2];
pixel_value_counter[b]++;
break;
case 3:/*Grey Histogram*/
gry = subimage_data[i][j][k][l][3];
pixel_value_counter[gry]++;
break;
}/*switch*/
}/*for l*/
}/*for k*/
for (m=0;m<COLORS;m++){
hist_data[i][j][m].num_pixels = pixel_value_counter[m];
hist_data[i][j][m].freq = ((float)pixel_value_counter[m] / max_pixels);
}/*for m*/
}/*for j*/
}/*for i*/
return TRUE;
}
/* ############################################################################
Name : free_mem_histogram
Description : Free memory from histogram.
Arguments Type Description
===================== =================== =====================================
width_subimages(IN) unsigned int Width coordinate of subimage.
height_subimages(IN) unsigned int Height coordinate of subimage.
Return Values Description
========================================= =====================================
TRUE If all goes well.
Globals Type Description
===================== =================== =====================================
hist_data(IN) histogram *** Histogram from subimages.
Locals Type Description
===================== =================== =====================================
i, j unsigned int General purpose indexes.
############################################################################ */
int free_mem_histogram(unsigned int width_subimages, unsigned int height_subimages)
{
unsigned int i = 0, j = 0;
for (i=0;i<height_subimages;i++){
for (j=0;j<width_subimages;j++){
free(hist_data[i][j]);
}/*for j*/
free(hist_data[i]);
}/*for i*/
free(hist_data);
return TRUE;
}
/* ############################################################################
Name : calculate_threshold
Description : Calculate threshold values according to the algorithm
from Gonzales, R.C, Woods, R.E., 2002. Digital Image
ProceHeightBlockStartng, 2nd ed Prentice Hall, Upper Saddle River, NJ,
pp. 598-600(10.3.3 Basic Global Thresholding).
Arguments Type Description
===================== =================== =====================================
width(IN) int Width of image.
height(IN) int Height of image.
width_subimages(IN) unsigned int Width coordinate of subimage.
height_subimages(IN) unsigned int Height coordinate of subimage.
Return Values Description
========================================= =====================================
TRUE If all goes well.
FALSE If memory allocation fails.
Globals Type Description
===================== =================== =====================================
hist_data(IN) histogram *** Histogram from subimages.
Ts(OUT) unsigned char ** Calculate one threshold per subimage.
Locals Type Description
===================== =================== =====================================
i, j, k, l unsigned int General purpose indexes.
############################################################################ */
int calculate_threshold(int width, int height, unsigned int width_subimages, unsigned int height_subimages)
{
unsigned int i = 0, j = 0;
/* Allocate memory for threshold data*/
Ts = (unsigned char **)malloc(height_subimages * sizeof(unsigned char *));
if (Ts == NULL){
printf("Could not allocate %d bytes.\n", (height_subimages * sizeof(unsigned char *)));
return FALSE;
}
else{
for (i=0;i<height_subimages;i++){
Ts[i] = (unsigned char *)malloc(width_subimages * sizeof(unsigned char));
if (Ts[i] == NULL){
printf("Could not allocate %d bytes for i=%d index.\n", (width_subimages * sizeof(unsigned char)), i);
return FALSE;
}
else{
for (j=0;j<width_subimages;j++){
Ts[i][j] = 0;
}/*for j*/
}
}/*for i*/
}
/* initialize random seed: */
srand (time(NULL));
for (i=0;i<height_subimages;i++){
for (j=0;j<width_subimages;j++){
/*********************Begin Step 1*********************/
/*Find min and max value of histogram*/
unsigned char max_gry_lvl = 0, min_gry_lvl = 0;
calculate_min_max_hist_threshold(i, j, &max_gry_lvl, &min_gry_lvl);
/*printf("[%d %d] [max_level:%d min_level:%d]\n", i, j, max_gry_lvl, min_gry_lvl);*/
/*Initial value of T is the mean value of min and max of grey levels*/
float Tstart = ((float)(max_gry_lvl + min_gry_lvl) / 2);
/*Initial value of T is a random value between 0 and COLORS-1*/
/*float Tstart = rand()/(float)(((float)RAND_MAX + 1) / COLORS);*/
/*Initial value of T is a 0*/
/*float Tstart = 0.0;*/
/*printf("Tstart:%f\n", Tstart);*/
/*********************End Step 1*********************/
basic_global_thresholding_algorithm(i, j, Tstart, &Ts[i][j]);
}/*for j*/
}/*for i*/
return TRUE;
}
/* ############################################################################
Name : calculate_min_max_hist_threshold
Description : Calculate the minimum and maximum grey
level value of the histogram.
Arguments Type Description
===================== =================== =====================================
h_subim_index(IN) unsigned int Index for height coordinate of
subimage.
w_subim_index(IN) unsigned int Index for width coordinate of
subimage.
max_lvl_hist(OUT) unsigned char * The level of histogram that has the
maximum value.
min_lvl_hist(OUT) unsigned char * The level of histogram that has the
minimum value.
Return Values Description
========================================= =====================================
TRUE If all goes well.
Globals Type Description
===================== =================== =====================================
hist_data histogram *** The histogram of the subimages.
Locals Type Description
===================== =================== =====================================
i unsigned int General purpose index.
max_pix_hist unsigned int The maximum value of histogram.
min_pix_hist unsigned int The minimum value of histogram
max_lvl unsigned char The level of histogram that has the
maximum value.
min_lvl unsigned char The level of histogram that has the
minimum value.
############################################################################ */
int calculate_min_max_hist_threshold(unsigned int h_subim_index, unsigned int w_subim_index, unsigned char *max_lvl_hist, unsigned char *min_lvl_hist)
{
unsigned int i = 0;
/*Number of pixels for each level*/
unsigned int max_pix_hist = 0, min_pix_hist = UINT_MAX;
unsigned char max_lvl = 0, min_lvl = 0;
for (i=0;i<COLORS;i++){
if (hist_data[h_subim_index][w_subim_index][i].num_pixels > max_pix_hist){
max_pix_hist = hist_data[h_subim_index][w_subim_index][i].num_pixels;
max_lvl = i;
}
if (hist_data[h_subim_index][w_subim_index][i].num_pixels <= min_pix_hist){
min_pix_hist = hist_data[h_subim_index][w_subim_index][i].num_pixels;
min_lvl = i;
}
}
(*max_lvl_hist) = max_lvl;
(*min_lvl_hist) = min_lvl;
return TRUE;
}
/* ############################################################################
Name : basic_global_thresholding_algorithm
Description : Calculate threshold values according to the algorithm
from Gonzales, R.C, Woods, R.E., 2002. Digital Image
ProceHeightBlockStartng, 2nd ed Prentice Hall, Upper Saddle River, NJ,
pp. 598-600(10.3.3 Basic Global Thresholding).
Arguments Type Description
===================== =================== =====================================
h_subim_index(IN) unsigned int Index for height coordinate of
subimage.
w_subim_index(IN) unsigned int Index for width coordinate of
subimage.
Tstart(IN) float The initial value for threshold.
Ts(OUT) unsigned char * The output value for threshold.
Return Values Description
========================================= =====================================
TRUE If all goes well.
Globals Type Description
===================== =================== =====================================
hist_data histogram *** The histogram of the subimages.
Locals Type Description
===================== =================== =====================================
i unsigned int General purpose index.
Tend float The output value of threshold.
first_run_flag unsigned char A flag for getting into the loop for
first time.
mi1_values unsigned int Sum of pixel values in G1.
mi2_values unsigned int Sum of pixel values in G2.
count_mi1 unsigned int Total number of pixels that are
located in G1 region.
count_mi2 unsigned int Total number of pixels that are
located in G2 region.
mi1 float Average grey level value for
region G1.
mi2 float Average grey level value for
region G2.
############################################################################ */
int basic_global_thresholding_algorithm(unsigned int h_subim_index, unsigned int w_subim_index, float Tstart, unsigned char *Ts)
{
unsigned int i = 0;
float Tend = 0.0;
unsigned char first_run_flag = TRUE;
while(fabs(Tstart - Tend) > DIFF_T){/*Step 5*/
if (!first_run_flag)
memcpy(&Tstart, &Tend, sizeof(Tend));
/*printf("Tstart:%f Tend:%f\n", Tstart, Tend);*/
/*********************Begin Step 2 & 3*********************/
/*
* Calculate the average grey level values mi1 and mi2 for the pixels
* in regions G1 and G2.
*/
unsigned int mi1_values = 0, mi2_values = 0;
unsigned int count_mi1 = 0, count_mi2 = 0;
float mi1 = 0, mi2 = 0;
for (i=0;i<COLORS;i++){
if (i > (unsigned int)Tstart){/*G1 region*/
mi1_values += (i*hist_data[h_subim_index][w_subim_index][i].num_pixels);
count_mi1 += hist_data[h_subim_index][w_subim_index][i].num_pixels;
}
else if (i <= (unsigned int)Tstart){/*G2 region*/
mi2_values += (i*hist_data[h_subim_index][w_subim_index][i].num_pixels);
count_mi2 += hist_data[h_subim_index][w_subim_index][i].num_pixels;
}
}
if (!count_mi1)/*if count_mi1 == 0*/
count_mi1 = 1;
if (!count_mi2)/*if count_mi2 == 0*/
count_mi2 = 1;
mi1 = ((float)mi1_values / count_mi1);
mi2 = ((float)mi2_values / count_mi2);
/*printf("[mi1:%f mi2:%f][mi1_values:%u mi2_values:%u] [count_mi1:%u count_mi2:%u]\n", mi1, mi2, mi1_values, mi2_values, count_mi1, count_mi2);*/
/*********************End Step 2 & 3*********************/
/*********************Begin Step 4*********************/
Tend = ((float)(mi1 + mi2) / 2);
/*printf("Tend:%f\n", Tend);*/
/*********************End Step 4*********************/
first_run_flag = FALSE;
}/*while Step 5*/
/*printf("[%u %u] Tend:%f\n", h_subim_index, w_subim_index, Tend);*/
(*Ts) = (unsigned char)Tend;
return TRUE;
}
/* ############################################################################
Name : calculate_threshold_with_interpolation
Description : Calculate thresholds using interpolation.
Arguments Type Description
===================== =================== =====================================
type(IN) unsigned char 0 bilinear interpolation with weights
propotional to square of distance.
1 bilinear interpolation with weights
propotional to distance.
width(IN) int Width of image.
height(IN) int Height of image.
width_subimages(IN) unsigned int Width coordinate of subimage.
height_subimages(IN) unsigned int Height coordinate of subimage.
Return Values Description
========================================= =====================================
TRUE If all goes well.
Globals Type Description
===================== =================== =====================================
subimage_data(OUT) unsigned char ***** Subimages data.
[Width-coodinate of subimage]
[Height-Coordinate of subimage]
[x-coordinate in subimage]
[y-cooddinate in subimage]
[0: Red from RGB value
1: Green from RGB value
2: Blue from RGB value
3: Grey value
4: Threshold value]
Locals Type Description
===================== =================== =====================================
i, j, k, l unsigned int General purpose indexes.
HeightBlockSize unsigned int The maximum height of the subimage.
WidthBlockSize unsigned int The maximum width of the subimage.
############################################################################ */
int calculate_threshold_with_interpolation(unsigned char type, int width, int height, unsigned int width_subimages, unsigned int height_subimages)
{
unsigned int i = 0, j = 0, k = 0, l = 0;
unsigned int HeightBlockSize = 0;
unsigned int WidthBlockSize = 0;
/*
* AHeightBlockStartgn in (0,0) position in a subimage the
* Threshold value that it was calculated before.
* The others values will be calculated using interpolation.
*/
for (i=0;i<height_subimages;i++){
for (j=0;j<width_subimages;j++){
/*------------------------------------------------*/
Calculate_Block_Size(i, j, height, width, &HeightBlockSize, &WidthBlockSize);
/*------------------------------------------------*/
for(k=0;k<HeightBlockSize;k++){
for(l=0;l<WidthBlockSize;l++){
unsigned int TsHeightPos = 0;
unsigned int TsWidthPos = 0;
subimage_data[i][j][TsHeightPos][TsWidthPos][4] = Ts[i][j];
}/*for l*/
}/*for k*/
}/*for j*/
}/*for i*/
for (i=0;i<height_subimages;i++){
for (j=0;j<width_subimages;j++){
/*------------------------------------------------*/
Calculate_Block_Size(i, j, height, width, &HeightBlockSize, &WidthBlockSize);
/*------------------------------------------------*/
for(k=0;k<HeightBlockSize;k++){
for(l=0;l<WidthBlockSize;l++){
unsigned int TsHeightPos = 0;
unsigned int TsWidthPos = 0;
if (!k && !l)/*Don't compute the position (0,0)*/
continue;
switch(type){
case 0:
if ((i < (height_subimages - 1)) && (j < (width_subimages - 1))){
bilinear_interpolation_with_weights_propotional_to_square_of_distance(i, j, k, l, HeightBlockSize, WidthBlockSize, TsHeightPos, TsWidthPos, &subimage_data[i][j][k][l][4]);
}
else{
linear_interpolation_in_2d_data(i, j, height_subimages, width_subimages, k, l, HeightBlockSize, WidthBlockSize, TsHeightPos, TsWidthPos, &subimage_data[i][j][k][l][4]);
}
break;
case 1:
if ((i < (height_subimages - 1)) && (j < (width_subimages - 1))){
bilinear_interpolation_with_weights_propotional_to_distance(i, j, k, l, HeightBlockSize, WidthBlockSize, TsHeightPos, TsWidthPos, &subimage_data[i][j][k][l][4]);
}
else{
linear_interpolation_in_2d_data(i, j, height_subimages, width_subimages, k, l, HeightBlockSize, WidthBlockSize, TsHeightPos, TsWidthPos, &subimage_data[i][j][k][l][4]);
}
break;
}
}/*for l*/
}/*for k*/
}/*for j*/
}/*for i*/
return TRUE;
}
/* ############################################################################
Name : bilinear_interpolation_with_weights_propotional_to_square_of_distance
Description : Bilinear interpolation with weights propotional to square of distance
Arguments Type Description
===================== =================== =====================================
h_subim_index(IN) unsigned int Index of subimage in height
coordinate.
w_subim_index(IN) unsigned int Index of subimage in width
coordinate.
x(IN) unsigned int Height coordinate in the subimage.
y(IN) unsigned int width coordinate in the subimage.
Max_x(IN) unsigned int Height of the subimage.
Max_y(IN) unsigned int Width of the subimage.
Ti(OUT) unsigned char * The interpolated threshold.
Return Values Description
========================================= =====================================
TRUE If all goes well.
Globals Type Description
===================== =================== =====================================
subimage_data(IN) unsigned char ***** Subimages data.
[Width-coodinate of subimage]
[Height-Coordinate of subimage]
[x-coordinate in subimage]
[y-cooddinate in subimage]
[0: Red from RGB value
1: Green from RGB value
2: Blue from RGB value
3: Grey value
4: Threshold value]
Locals Type Description
===================== =================== =====================================
i, j, k, l unsigned int General purpose indexes.
############################################################################ */
int bilinear_interpolation_with_weights_propotional_to_square_of_distance(unsigned int h_subim_index, unsigned int w_subim_index, unsigned int x, unsigned int y, unsigned int Max_x, unsigned int Max_y, unsigned int TsHeightPos, unsigned int TsWidthPos, unsigned char *Ti)
{