Jetbrains全系列IDE使用 1年只要46元 售后保障 童叟无欺
// 链接 https://blog.csdn.net/linqianbi/article/details/78617615
// Gamma 校正
#include <iostream>
#include <opencv2\core\core.hpp>
#include <opencv2\highgui\highgui.hpp>
#include <opencv2\imgproc\imgproc.hpp>
#include<cmath>
using namespace cv;
Mat gammaTransform(Mat& srcImage, float kFactor)
{
unsigned char LUT[256];
for (int i = 0; i < 256; i++)
{
float f = (i + 0.5f) / 255;
f = (float)(pow(f, kFactor));
LUT[i] = saturate_cast<uchar>(f * 255.0f - 0.5f);
}
Mat resultImage = srcImage.clone();
if (srcImage.channels() == 1)
{
MatIterator_<uchar> iterator = resultImage.begin<uchar>();
MatIterator_<uchar> iteratorEnd = resultImage.end<uchar>();
for (; iterator != iteratorEnd; iterator++)
{
*iterator = LUT[(*iterator)];
}
}
else
{
MatIterator_<Vec3b> iterator = resultImage.begin<Vec3b>();
MatIterator_<Vec3b> iteratorEnd = resultImage.end<Vec3b>();
for (; iterator != iteratorEnd; iterator++)
{
(*iterator)[0] = LUT[((*iterator)[0])];//b
(*iterator)[1] = LUT[((*iterator)[1])];//g
(*iterator)[2] = LUT[((*iterator)[2])];//r
}
}
return resultImage;
}
int main()
{
Mat srcImage = imread("test.jpg");
if (!srcImage.data)
{
printf("could not load image...\n");
return -1;
}
//取两种不同的gamma值
float gamma1 = 3.33f;
float gamma2 = 0.33f;
float kFactor1 = 1 / gamma1;
float kFactor2 = 1 / gamma2;
Mat result1 = gammaTransform(srcImage, kFactor1);
Mat result2 = gammaTransform(srcImage, kFactor2);
namedWindow("demo", CV_WINDOW_AUTOSIZE);
imshow("srcImage", srcImage);
imshow("res1", result1);
imshow("res2", result2);
imwrite("Gamma.jpg", result1);
waitKey(0);
waitKey(0);
return 0;
}
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