opencv中对图像的像素操作

1.对灰度图像的像素操作:

#include<iostream>
#include<opencv2/opencv.hpp>

using namespace std;
using namespace cv;

int main(int argc, char **argv)
{
    Mat src = imread("D:/meinv.jpg");
    namedWindow("源图像",CV_WINDOW_AUTOSIZE);
    imshow("源图像",src);
    /*Mat gray;
    cvtColor(src, gray, CV_BGR2GRAY);
    imshow("灰度图像", gray);*/
    /*   对灰度图像的像素改写
    int height = src.rows;
    int width = src.cols;
    int channels = src.channels();
    for (int i = 0; i < height; i++)
    {
        for (int j = 0; j < width; j++)
        {
            int gray_data = gray.at<uchar>(i, j);
            gray.at<uchar>(i, j) = 255 - gray_data;
        }
    }
    imshow("反色图像", gray);*/
}

显示结果:

(1)彩色图像

(2)灰度图像

(3)反色图像

 

2.对彩色图像像素的操作

        Mat dst;
	dst.create(src.size(), src.type());
	int height = src.rows;
	int width = src.cols;
	int channels = src.channels();

	for (int i = 0; i < height; i++)
	{
		for (int j = 0; j < width; j++)
		{
			int b = src.at<Vec3b>(i, j)[0];
			int g = src.at<Vec3b>(i, j)[1];
			int r = src.at<Vec3b>(i, j)[2];

			dst.at<Vec3b>(i, j)[0] = 255 - b;
			dst.at<Vec3b>(i, j)[1] = 255 - g;
			dst.at<Vec3b>(i, j)[2] = 255 - r;
		}
	}
    //进行反色的另一种方法:调用API
	/*bitwise_not(src, dst);*/
	imshow("反色图像",dst);
	imwrite("D:/dst.jpg", dst);
	waitKey(0);
	return 0;        

显示结果:

posted @ 2018-09-08 17:05  RamboBai  阅读(3848)  评论(0编辑  收藏  举报