opencv对比度跟亮度

Posted 2020-10-06 Montauk

#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <iostream>

using namespace std;
using namespace cv;

static void on_ContrastAndBright(int, void *);
static void ShowHelpText();

int g_nContrastValue;
int g_nBrightValue;
Mat g_srcImage, g_dstImage;

int main() {
    g_srcImage = imread("c:\\pics\\2.jpg");
    if (!g_srcImage.data) {
        printf("Reading picture error");
        return false;
    }
    g_dstImage = Mat::zeros(g_srcImage.size(), g_srcImage.type());

    g_nContrastValue = 80;
    g_nBrightValue = 80;

    namedWindow("Effect Window", 1);

    createTrackbar("contact:", "Effect Window", &g_nContrastValue, 300, on_ContrastAndBright);
    createTrackbar("brightness", "Effect Window", &g_nBrightValue, 300, on_ContrastAndBright);

    on_ContrastAndBright(g_nContrastValue, 0);
    on_ContrastAndBright(g_nBrightValue, 0);

    while (char(waitKey(1)) != ‘q‘) {}
    return 0;
}


static void on_ContrastAndBright(int, void *) {
    namedWindow("Original Window", 1);

    for (int y = 0; y < g_srcImage.rows; y++) {
        for (int x = 0; x < g_srcImage.cols; x++) {
            for (int c = 0; c < 3; c++) {
                g_dstImage.at<Vec3b>(y, x)[c] = saturate_cast<uchar>((g_nContrastValue*0.01)*(g_srcImage.at<Vec3b>(y, x)[c]) + g_nBrightValue);
            }
        }
    }
    imshow("Original Window", g_srcImage);
    imshow("Effect Window", g_dstImage);
}