I have some code to try to run a sobel edge detection program for images. I am confusded on how to use an image as input with the argc and argv arguments in main for the code. Here is the code: #include #include #include #define ROWS 100 #define COLS 100 // Sobel kernels int sobel_x[3][3] = { {-1, 0, 1}, {-2, 0, 2}, {-1, 0, 1} }; int sobel_y[3][3] = { {-1, -2, -1}, { 0, 0, 0}, { 1, 2, 1} }; // Function to apply Sobel edge detection void sobel_edge_detection(int image[ROWS][COLS], int output[ROWS][COLS]) { int i, j, x, y; int Gx, Gy, gradient; for (i = 1; i < ROWS - 1; i++) { for (j = 1; j < COLS - 1; j++) { Gx = Gy = 0; // Convolve image with Sobel kernels for (x = -1; x <= 1; x++) { for (y = -1; y <= 1; y++) { Gx += image[i + x][j + y] * sobel_x[x + 1][y + 1]; Gy += image[i + x][j + y] * sobel_y[x + 1][y + 1]; } } // Compute gradient magnitude gradient = abs(Gx) + abs(Gy); // Thresholding output[i][j] = (gradient > 100) ? 255 : 0; } } } // Function to read image from a file void read_image(const char* filename, int image[ROWS][COLS]) { FILE *file = fopen(filename, "rb"); if (file == NULL) { printf("Error: Unable to open file\n"); exit(1); } // Read pixel data fread(image, sizeof(int), ROWS * COLS, file); fclose(file); } // Function to write image to a file void write_image(const char* filename, int image[ROWS][COLS]) { FILE *file = fopen(filename, "wb"); for (int i = 0; i < ROWS; i++) { for (int j = 0; j < COLS; j++) { fprintf("%d ", output_image[i][j]); } fprintf("\n"); } fclose(file); } int main(int argc, char *argv[]) { if (argc != 2) { printf("Usage: %s \n", argv[0]); return 1; } int input_image[ROWS][COLS]; int output_image[ROWS][COLS]; // Read image from file read_image(argv[1], input_image); // Apply Sobel edge detection sobel_edge_detection(input_image, output_image); write_image("edge_output.png", output_image); return 0; }
I have some code to try to run a sobel edge detection program for images. I am confusded on how to use an image as input with the argc and argv arguments in main for the code.
Here is the code:
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#define ROWS 100
#define COLS 100
// Sobel kernels
int sobel_x[3][3] = { {-1, 0, 1},
{-2, 0, 2},
{-1, 0, 1} };
int sobel_y[3][3] = { {-1, -2, -1},
{ 0, 0, 0},
{ 1, 2, 1} };
// Function to apply Sobel edge detection
void sobel_edge_detection(int image[ROWS][COLS], int output[ROWS][COLS]) {
int i, j, x, y;
int Gx, Gy, gradient;
for (i = 1; i < ROWS - 1; i++) {
for (j = 1; j < COLS - 1; j++) {
Gx = Gy = 0;
// Convolve image with Sobel kernels
for (x = -1; x <= 1; x++) {
for (y = -1; y <= 1; y++) {
Gx += image[i + x][j + y] * sobel_x[x + 1][y + 1];
Gy += image[i + x][j + y] * sobel_y[x + 1][y + 1];
}
}
// Compute gradient magnitude
gradient = abs(Gx) + abs(Gy);
// Thresholding
output[i][j] = (gradient > 100) ? 255 : 0;
}
}
}
// Function to read image from a file
void read_image(const char* filename, int image[ROWS][COLS]) {
FILE *file = fopen(filename, "rb");
if (file == NULL) {
printf("Error: Unable to open file\n");
exit(1);
}
// Read pixel data
fread(image, sizeof(int), ROWS * COLS, file);
fclose(file);
}
// Function to write image to a file
void write_image(const char* filename, int image[ROWS][COLS]) {
FILE *file = fopen(filename, "wb");
for (int i = 0; i < ROWS; i++) {
for (int j = 0; j < COLS; j++) {
fprintf("%d ", output_image[i][j]);
}
fprintf("\n");
}
fclose(file);
}
int main(int argc, char *argv[]) {
if (argc != 2) {
printf("Usage: %s <image_file>\n", argv[0]);
return 1;
}
int input_image[ROWS][COLS];
int output_image[ROWS][COLS];
// Read image from file
read_image(argv[1], input_image);
// Apply Sobel edge detection
sobel_edge_detection(input_image, output_image);
write_image("edge_output.png", output_image);
return 0;
}
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