153 lines
3.6 KiB
C
153 lines
3.6 KiB
C
// Objectif : utiliser du multithreading pour améliorer la rapidité
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <math.h>
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int COLONNES;
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int LIGNES;
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int DISTANCE;
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// taille du fichier. update global variables
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int* taille(char* filepath){
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FILE* ptr;
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char ch;
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ptr = fopen(filepath, "r");
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if (NULL == ptr) {
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printf("file can't be opened \n");
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}
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int lignes = 0;
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int colonnes = 1;
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int end = 1;
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while (!feof(ptr)) {
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ch = fgetc(ptr);
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if (ch == '\n'){
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lignes ++;
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end = 0;
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}
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else if(ch == ',' && end) {
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colonnes ++;
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}
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}
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LIGNES = lignes;
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COLONNES = colonnes;
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DISTANCE = (int)round(sqrt(COLONNES *COLONNES + LIGNES *LIGNES));
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}
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//retourne la matrice
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int* read_img(char* filepath){
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int* matrice = malloc((COLONNES * LIGNES) * sizeof(int));
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FILE* ptr;
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char ch;
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ptr = fopen(filepath, "r");
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if (NULL == ptr) {
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printf("file can't be opened \n");
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}
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int c = 0;
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while (!feof(ptr)) {
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ch = fgetc(ptr);
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if (feof(ptr)){
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fclose(ptr);
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return matrice;
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}
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if (ch == '\n'){
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c++;
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}
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else if(ch == ',') {
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c++;
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}
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else if (ch == ' '){}
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else {
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//printf("%c\n", ch);
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matrice[c] *= 10;
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matrice[c] += (int)ch - 48;
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}
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}
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}
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void print_matrice(int* mat){
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for (int i = 0; i<LIGNES; i++){
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for (int j = 0; j < COLONNES; j++){
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printf("%d | ", mat[i*COLONNES + j]);
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}
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printf("\n");
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}
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}
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double rho(int x, int y, double theta){
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return(x * cos(theta) + y * sin(theta));
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}
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int* espace_hough(int* image, int precision){
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int* mat_hough = malloc(360 * precision * DISTANCE * sizeof(int));
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int v_rho;
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double theta_rad;
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for (int i = 0; i< 360 * DISTANCE * precision; i++){
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mat_hough[i] = 0;
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}
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for (int y = 0; y < LIGNES; y++){
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for (int x = 0; x < COLONNES; x++){
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if (image[y*COLONNES + x] > 250){
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for (int theta_deg = 0; theta_deg < 360 * precision ;theta_deg ++){
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theta_rad = theta_deg /(180.0 * precision) * M_PI;
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v_rho = rho(x, y, theta_rad);
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if (v_rho > 0){
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mat_hough[v_rho * 360 * precision + theta_deg] += 1;
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}
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}
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}
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}
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}
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return(mat_hough);
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}
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void print_hough(int* mat){
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for (int i = 0; i<360; i++){
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for (int j = 0; j < DISTANCE; j++){
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printf("%d | ", mat[j*360 + i]);
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}
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printf("\n");
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}
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}
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void save_file(int* mat, int precision){
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FILE *ptr;
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ptr = fopen("./out.txt","w");
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for (int j = 0; j < DISTANCE; j++){
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for (int i = 0; i<360 * precision; i++){
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fprintf(ptr, "%d", mat[j*360 * precision + i]);
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if (i != 360 * precision - 1){
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fprintf(ptr, "%s",",");
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}
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}
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fprintf(ptr, "%s","\n");
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}
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fclose(ptr);
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}
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int main()
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{
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int precision = 100;
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printf("precision : %d\n", precision);
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char* filepath = "./in.txt";
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taille(filepath);
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printf("Lignes : %d\nColonnes : %d\nnombre de pixels : %d\nDistance : %d\n", LIGNES, COLONNES,(LIGNES)*(COLONNES), DISTANCE);
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int* image = read_img(filepath);
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//print_matrice(image);
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int* espace = espace_hough(image, precision);
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//print_hough(espace);
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save_file(espace, precision);
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return 0;
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}
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