OpenCV学习之路（九） 图像对比度、亮度

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官方文档

通常图像操作有两种：

点操作

邻域操作

对比度、亮度调整就是典型的点操作。

简单操作实例如下：

#include<opencv2/opencv.hpp>

using namespace cv;

void on_BrightnessAndContrast(int, void*);

int g_nContrast, g_nBrightness;
int g_nMaxContrast = 300;
int g_nMaxBrightness = 200;
Mat srcImage, dstImage;

int main()
{
	srcImage = imread("cat.jpg");

	dstImage = Mat::zeros(srcImage.size(), srcImage.type());

	namedWindow("【效果图窗口】", 1);
	createTrackbar("对比度", "【效果图窗口】", &g_nContrast, g_nMaxContrast, on_BrightnessAndContrast);
	createTrackbar("亮度", "【效果图窗口】", &g_nBrightness, g_nMaxBrightness, on_BrightnessAndContrast);

	on_BrightnessAndContrast(g_nContrast, 0);
	on_BrightnessAndContrast(g_nBrightness, 0);

	waitKey(0);
	return 0;
}

void on_BrightnessAndContrast(int, void*)
{
	for (int i = 0; i < srcImage.rows; i++)
		for (int j = 0; j < srcImage.cols; j++)
			for (int c = 0; c < srcImage.channels(); c++)
			{
				dstImage.at<Vec3b>(i, j)[c] = saturate_cast<uchar>((g_nContrast * 0.01) * (srcImage.at<Vec3b>(i, j)[c]) + g_nBrightness);
			}

	
	imshow("原图", srcImage);
	imshow("【效果图窗口】", dstImage);
}

 代码运行结果如下图：