写一个图像二值化的C语言代码

当然可以为您提供一个简单的图像二值化C语言代码：

#include <stdio.h>
#include <stdlib.h>

#define THRESHOLD 128

int main()
{
  FILE *fp_in, *fp_out;
  char *infile = "input.bmp";
  char *outfile = "output.bmp";

  unsigned char header[54];
  unsigned char colorTable[1024];
  unsigned char buf[3];

  int i, j, offset;
  int width, height;
  int padding;
  unsigned char gray;

  fp_in = fopen(infile, "rb");
  fp_out = fopen(outfile, "wb");

  if(fp_in == NULL || fp_out == NULL)
  {
    printf("Error: file open.\n");
    exit(0);
  }

  // Read header and color table
  fread(header, sizeof(unsigned char), 54, fp_in);
  fwrite(header, sizeof(unsigned char), 54, fp_out);

  // Extract image parameters
  width = *(int*)&header[18];
  height = *(int*)&header[22];
  padding = (4 - (width * 3) % 4) % 4;

  // Read image pixel by pixel
  for(i = 0; i < height; i++)
  {
    for(j = 0; j < width; j++)
    {
      fread(buf, sizeof(unsigned char), 3, fp_in);

      // Calculate grayscale value
      gray = buf[2] * 0.299 + buf[1] * 0.587 + buf[0] * 0.114;

      // Apply thresholding
      if(gray > THRESHOLD)
      {
        buf[0] = 255;
        buf[1] = 255;
        buf[2] = 255;
      }
      else
      {
        buf[0] = 0;
        buf[1] = 0;
        buf[2] = 0;
      }

      fwrite(buf, sizeof(unsigned char), 3, fp_out);
    }

    // Add padding
    for(j = 0; j < padding; j++)
    {
      fputc(0x00, fp_out);
    }
  }

  fclose(fp_in);
  fclose(fp_out);

  return 0;
}

这个代码可以将一个 input.bmp 的图像进行二值化处理，输出到 output.bmp 中。代码将图像转换为灰度值后，根据阈值将灰度值进行二分类，分别用黑色和白色表示，从而实现了二值化。如果您有其它问题，请随时问我吧！