实验三

Co-authored-by: Copilot <copilot@github.com>
2026-04-27 19:00:59 +08:00
parent a4d57ddbea
commit ab8ac63ad0
9 changed files with 231 additions and 0 deletions
@@ -0,0 +1,79 @@
+#include<iostream>
+#include<cmath>
+#include<cstdio>
+
+#define H 265
+#define W 272
+
+using namespace std;
+
+int main()
+{
+    unsigned char *grey;
+    grey = new unsigned char[H * W];
+    FILE *f;
+    fopen_s(&f, "./数据/blood.raw", "rb");
+    if (f)
+    {
+        fread(grey, sizeof(unsigned char), H * W, f);
+        fclose(f);
+    }
+    else
+    {
+        cout << "无法打开文件" << endl;
+        return 0;
+    }
+
+    int tw = 3;
+    int th = 3;
+    int sobel_x[9]={-1,0,1,-2,0,2,-1,0,1};
+    int sobel_y[9]={-1,-2,-1,0,0,0,1,2,1};
+
+    int i,j,k,l;
+    unsigned char *result_grey;
+    result_grey = new unsigned char[H * W];
+
+    for (i = 0; i < H * W; i++)
+    {
+        result_grey[i] = 255;
+    }
+    for (i = th / 2; i < H - th / 2; i++)
+    {
+        for (j = tw / 2; j < W - tw / 2; j++)
+        {
+            int gx = 0;
+            int gy = 0;
+            for (k = -th / 2; k <= th / 2; k++)
+            {
+                for (l = -tw / 2; l <= tw / 2; l++)
+                {
+                    int pixel = grey[(i + k) * W + (j + l)];
+                    int index = (k + th / 2) * tw + (l + tw / 2);
+                    gx += pixel * sobel_x[index];
+                    gy += pixel * sobel_y[index];
+                }
+            }
+            int sum = (int)sqrt(gx * gx + gy * gy);
+            if (sum > 100)
+            {
+                result_grey[i * W + j] = 0;
+            }
+            else
+            {
+                result_grey[i * W + j] = 255;
+            }
+        }
+    }
+    FILE *fnew;
+    fopen_s(&fnew, "./数据/sobel.raw", "wb");
+    if (fnew)
+    {
+        fwrite(result_grey, sizeof(unsigned char), H * W, fnew);
+        fclose(fnew);
+    }
+    else
+    {
+        cout << "创建文件失败" << endl;
+        return 0;
+    }
+}