Image-binarization/image_binarization.c at main · Pichitek/Image-binarization · GitHub

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#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include "my_timers.h"

#define NUM_OF_THREADS 8

/*
* image parameters
*/
#define IMG_N_SHAPE 662
#define IMG_M_SHAPE 1178

void main()
{
    uint8_t* img;

    int img_dim  = IMG_N_SHAPE * IMG_M_SHAPE;
    int img_size = img_dim * sizeof(uint8_t);

    img = (uint8_t*)malloc(img_size);

    // Read values of image from file
    FILE* input_file;
    input_file = fopen("input.txt", "r");

    if (input_file == NULL)
    {
        printf("Error Reading File\n");
        exit (0);
    }

    for (int i = 0; i < IMG_N_SHAPE * IMG_M_SHAPE; i++)
    {
        fscanf(input_file, "%d\n", &img[i]);
    }

    fclose(input_file);

    // sanity check
    // for (int i = 0; i < 16; i++)
    // {
    //     printf("%d\n", img[i]);
    // }

    // Threshold definition
    uint8_t binarize_threshold = 11;

    long i = 0;

        omp_set_num_threads(4);

        // start_time();

        #pragma omp parallel sections private(i)
        {
            #pragma omp section
            for(i = 0; i < IMG_N_SHAPE * IMG_M_SHAPE; i+=4)
            {
                if (img[i] > binarize_threshold)
                {
                    img[i] = 255;
                }
                else
                {
                    img[i] = 0;
                }
            }

            #pragma omp section
            for( i=1; i<IMG_N_SHAPE * IMG_M_SHAPE; i+=4)
            {
                if (img[i] > binarize_threshold)
                {
                    img[i] = 255;
                }
                else
                {
                    img[i] = 0;
                }
            }

            #pragma omp section
            for( i=2; i<IMG_N_SHAPE * IMG_M_SHAPE; i+=4)
            {
                if (img[i] > binarize_threshold)
                {
                    img[i] = 255;
                }
                else
                {
                    img[i] = 0;
                }
            }

            #pragma omp section
            for( i=3; i<IMG_N_SHAPE * IMG_M_SHAPE; i+=4)
            {
                if (img[i] > binarize_threshold)
                {
                    img[i] = 255;
                }
                else
                {
                    img[i] = 0;
                }
            }
        }//end parallel

        // stop_time();

        // print_time("Elapsed:");

    // Save to txt file
    FILE* output_file;
    output_file = fopen("output_bin_omp.txt", "w");

    if (output_file == NULL)
    {
        printf("Error Reading File\n");
        exit (0);
    }

    for (int i = 0; i < IMG_N_SHAPE * IMG_M_SHAPE; i++)
    {
        fprintf(output_file, "%d\n", img[i]);
    }

    fclose(output_file);
}