图像对比度、亮度值调整

 1 #include<opencv2/opencv.hpp>
 2 #include<iostream>
 3 
 4 using namespace std;
 5 using namespace cv;
 6 
 7 static void on_ContrastAndBright(int, void *);
 8 static void ShowHelpText();
 9 
10 int g_nContrastValue;   //对比度值
11 int g_nBrightValue;    //亮度值
12 Mat g_srcImage, g_dstImage;
13 
14 int main() {
15     //读取输入图像
16     g_srcImage = imread("C:\\Users\\Nelsoner\\Desktop\\Camera Roll\\05.jpg");
17     g_dstImage = Mat::zeros(g_srcImage.size(), g_srcImage.type());
18 
19     //设定对比度和亮的初值
20     g_nContrastValue = 80;
21     g_nBrightValue = 80;
22 
23 
24 
25     //窗口
26     namedWindow("【效果图】", 1);
27 
28     //创建滑块
29     createTrackbar("对比度：", "【效果图】", &g_nContrastValue, 300, on_ContrastAndBright);
30     createTrackbar("亮  度：", "【效果图】", &g_nBrightValue, 200, on_ContrastAndBright);
31 
32     //进行回调函数的初始化
33     on_ContrastAndBright(g_nContrastValue, 0);
34     on_ContrastAndBright(g_nBrightValue, 0);
35 
36     waitKey();
37     return  0;
38 }
39 
40 static void on_ContrastAndBright(int, void *) {
41     //创建窗口
42     namedWindow("【原始图窗口】", 1);
43     //三个for循环，执行运算g_dstImage(i,j) = a*g_srcImage(i,j) +b
44     for (int y = 0; y < g_srcImage.rows; y++) {
45         for (int x = 0; x < g_srcImage.cols; x++) {
46             for (int c = 0; c < 3; c++) {
47                 g_dstImage.at<Vec3b>(y, x)[c] = saturate_cast<uchar>((g_nContrastValue*0.01)*(g_srcImage.at<Vec3b>(y, x)[c]) + g_nBrightValue);
48             }
49         }
50     }
51 
52     //显示图像
53     imshow("【原始图窗口】", g_srcImage);
54     imshow("【效果图】", g_dstImage);
55 }