实验一代码

2026-03-24 19:32:48 +08:00
parent 183ff2d8dc
commit d8aa483712
6 changed files with 324 additions and 0 deletions
@@ -0,0 +1,58 @@
+#include<iostream>
+#include<cstdio>
+#include<cmath>
+#define H 1210
+#define W 1240
+
+using namespace std;
+
+int main()
+{
+	unsigned char* grey;
+	// 存灰度值的数组
+	grey = new unsigned char[H * W];
+	FILE* filetest;
+	//读取文件
+	fopen_s(&filetest, "E:\\Digital image process\\lab-1\\第一次上机实验数据\\test.raw", "rb");
+	fread(grey, sizeof(unsigned char), H * W, filetest);
+
+	int i, j;
+	int* Pi_number = new int[256];
+	for (i = 0; i < 256; i++) {
+		Pi_number[i] = 0;
+	}
+	for (i = 0; i < H; i++) {
+		for (j = 0; j < W; j++) {
+			Pi_number[grey[i * W + j]]++;
+		}
+	}
+	float* Pi = new float[256];
+	for (i = 0; i < 256; i++) {
+		Pi[i] = (float)Pi_number[i] / (H * W);
+	}
+
+	//计算均值和标准差
+	float mean = 0;
+	for (i = 0; i < 256; i++) {
+		mean += (float)i * Pi[i];
+	}
+
+	float variance = 0;
+	for (i = 0; i < 256; i++) {
+		variance += Pi[i] * (i - mean) * (i - mean);
+	}
+	float stdvar = sqrt(variance);
+
+	FILE* fileout;
+
+	fopen_s(&fileout, "E:\\Digital image process\\lab-1\\第一次上机实验数据\\result.txt", "w");
+
+	fprintf(fileout, "完成人：测绘2401 24110901003 毕爽爽 \n");
+	fprintf(fileout, "均值：%f，标准差：%f\n", mean, stdvar);
+	for (i = 0; i < 256; i++) {
+		fprintf(fileout, "灰度值为%d的像素个数：%d,频率：%f\n", i, Pi_number[i], Pi[i]);
+	}
+
+	fclose(filetest);
+	fclose(fileout);
+}