opencv c++ 调整亮度与对比度

kill bert

于 2019-09-22 19:51:15 发布

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分类专栏： opencv c++ 文章标签： opencv c++

本文链接：https://blog.youkuaiyun.com/Sweeping_Robot/article/details/101030696

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本文介绍了一个使用OpenCV库调整图像亮度和对比度的C++代码示例。通过读取图像，应用alpha和beta参数来改变图像的对比度和亮度，并展示调整前后的图像效果。

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#include<opencv2\opencv.hpp>
#include
#include<math.h>

using namespace cv;
int main()
{
Mat dst,m1;
Mat src = imread(“C:/Users/asus/Desktop/tupian/1.jpg”);
if (!src.data)
{
printf(“could not load image…\n”);
return -1;
}
char input_image[] = “input_image”;
namedWindow(input_image, 1);
imshow(input_image, src);
int height = src.rows;
int width = src.cols;
dst = Mat::zeros(src.size(), src.type());

float alpha = 1.2;
float beta = 30;

src.convertTo(m1, CV_32F);
for (int row = 0; row<height; row++)
{
	for (int col = 0; col<width; col++)
	{
		if (src.channels() == 1)
		{
			float v = src.at<uchar>(row, col);
			dst.at<uchar>(row, col) = saturate_cast<uchar>(v*alpha + beta);
		}
		if (src.channels() == 3)
		{
			float b= m1.at<Vec3f>(row, col)[0];
			float g = m1.at<Vec3f>(row, col)[1];
			float r = m1.at<Vec3f>(row, col)[2];
			dst.at<Vec3b>(row, col)[0] = saturate_cast<uchar>(b*alpha + beta);
			dst.at<Vec3b>(row, col)[1] = saturate_cast<uchar>(g*alpha + beta);
			dst.at<Vec3b>(row, col)[2] = saturate_cast<uchar>(r*alpha + beta);
		}
	}
}
imshow("out _image", dst);
waitKey(0);
return 0;

}