编写一个程序,可以在命令行输入参数,完成指定文件的直方图均衡,并存储到新文件,命令行参数如下 hist file1.bmp file2.bmp 第一个参数为可执行程序名称,第二个参数为原始图像文件名,第三个参数为新文件名(c语言代码)
时间: 2024-02-13 16:02:36 浏览: 22
好的,以下是一个简单的 C 语言程序,可以实现命令行输入参数,完成指定文件的直方图均衡,并存储到新文件。
```c
#include <stdio.h>
#include <stdlib.h>
#define MAX_FILENAME_LENGTH 256
#define MAX_PIXEL_VALUE 255
void histogram_equalization(unsigned char *image_data, int image_size);
int main(int argc, char *argv[]) {
char input_filename[MAX_FILENAME_LENGTH], output_filename[MAX_FILENAME_LENGTH];
FILE *input_file, *output_file;
unsigned char *image_data;
int image_size, i;
if (argc != 3) {
printf("Usage: %s input_file output_file\n", argv[0]);
exit(1);
}
sprintf(input_filename, "%s", argv[1]);
sprintf(output_filename, "%s", argv[2]);
input_file = fopen(input_filename, "rb");
if (input_file == NULL) {
printf("Error: cannot open input file %s\n", input_filename);
exit(1);
}
// Get the size of the input file
fseek(input_file, 0, SEEK_END);
image_size = ftell(input_file);
fseek(input_file, 0, SEEK_SET);
// Allocate memory for the image data
image_data = (unsigned char*) malloc(image_size);
if (image_data == NULL) {
printf("Error: cannot allocate memory for the image data\n");
exit(1);
}
// Read the image data from the input file
fread(image_data, 1, image_size, input_file);
fclose(input_file);
// Perform histogram equalization on the image data
histogram_equalization(image_data, image_size);
// Write the result to the output file
output_file = fopen(output_filename, "wb");
if (output_file == NULL) {
printf("Error: cannot open output file %s\n", output_filename);
exit(1);
}
fwrite(image_data, 1, image_size, output_file);
fclose(output_file);
free(image_data);
return 0;
}
void histogram_equalization(unsigned char *image_data, int image_size) {
int histogram[MAX_PIXEL_VALUE + 1] = {0};
int cumulative_histogram[MAX_PIXEL_VALUE + 1] = {0};
int i, pixel_value, new_pixel_value;
// Calculate the histogram of the image
for (i = 0; i < image_size; i++) {
pixel_value = (int) image_data[i];
histogram[pixel_value]++;
}
// Calculate the cumulative histogram of the image
cumulative_histogram[0] = histogram[0];
for (i = 1; i <= MAX_PIXEL_VALUE; i++) {
cumulative_histogram[i] = cumulative_histogram[i - 1] + histogram[i];
}
// Calculate the transformation function and perform histogram equalization
for (i = 0; i < image_size; i++) {
pixel_value = (int) image_data[i];
new_pixel_value = (int) ((cumulative_histogram[pixel_value] - 1) * MAX_PIXEL_VALUE / (image_size - 1));
image_data[i] = (unsigned char) new_pixel_value;
}
}
```
该程序可以通过命令行参数指定输入文件和输出文件,例如:
```shell
./hist file1.bmp file2.bmp
```
可执行程序名称为 hist,第二个参数为原始图像文件名 file1.bmp,第三个参数为新文件名 file2.bmp。程序会读取 file1.bmp 文件中的图像数据,进行直方图均衡处理,并将结果存储到 file2.bmp 文件中。