6,提高图像对比度和亮度

#include<opencv2/opencv.hpp>  
#include<iostream>  
#include<math.h>  
using namespace std;
using namespace cv;
int main(int argc, char**argv)
{
	Mat src, dst, src1;
	src = imread("D:/test3.jpg");
	if (src.empty()) {
		cout << "could not load image..." << endl;
		return -1;
	}

	namedWindow("input", CV_WINDOW_AUTOSIZE);
	imshow("input", src);
	resize(src, src1, Size(), 0.5, 0.5);
	namedWindow("aa", CV_WINDOW_AUTOSIZE);
	imshow("aa", src1);

	int height = src.rows;
	int width = src.cols;
	dst = Mat::zeros(src.size(), src.type());
	double alpha =1.5;//改变对比度
	float beta = 10;//改变亮度
	for (int row = 0; row < height; row++) {
		for (int col = 0; col < width; col++) {
			if (src.channels() == 3) {
				float r = src.at<Vec3b>(row, col)[0];
				float g = src.at<Vec3b>(row, col)[1];
				float b = src.at<Vec3b>(row, col)[2];
				dst.at<Vec3b>(row, col)[0] = saturate_cast<uchar>(r*alpha + beta);
				dst.at<Vec3b>(row, col)[1] = saturate_cast<uchar>(g*alpha + beta);
				dst.at<Vec3b>(row, col)[2] = saturate_cast<uchar>(b*alpha + beta);
			}
			else if (src.channels() == 1) {
				float v = src.at<uchar>(row, col);
				dst.at<uchar>(row, col) = saturate_cast<uchar>(v*alpha + beta);
			}

		}
	}

	namedWindow("output", CV_WINDOW_AUTOSIZE);
	imshow("output", dst);
	imwrite("D:/test6.jpg", dst);
	imwrite("D:/test5.jpg", src1);

	waitKey(0);
	return 0;
}