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我正在尝试从我已经拥有的 3 个不同的 CV_8UC1 图像创建 1 个 CV_8UC3 图像，即我正在尝试将我已经拥有的不同单通道图像分配到单个 1 多维图像中。 可能下面的代码直接与 3 通道图像完美结合，但如果合并和提取它会出现运行时错误。 非法经营

#include <opencv2/opencv.hpp>
#include <stdio.h>
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include<vector>
typedef cv::Vec3b Pixel;  //  correct


struct Operator {
    void operator ()(cv::Vec3b &pixel, const int * position) const 
    {    
            pixel[2]*=0.5; 
    }
}; 

int main(int argc, char** argv )
{
    cv::VideoCapture cap(0);
    if(!cap.isOpened())  
        return -1;
    cv::Mat frame1,frame2,for_each,cblue, cgreen, cred; 
    std::vector<cv::Mat> channels { cblue, cgreen, cred};
    for(;;)
    {
            cap >> frame1;    
            cvtColor(frame1, frame1, cv::COLOR_BGR2GRAY); 
            frame1.convertTo(frame2,CV_8U);

            frame2.copyTo(cblue);
            frame2.copyTo(cgreen);
            frame2.copyTo(cred);

            cv::merge(channels, for_each);

            double t1 = (double)cv::getTickCount();
            for_each.forEach<Pixel>(Operator());
            t1 = ((double)cv::getTickCount() - t1)/cv::getTickFrequency();
            std::cout<< "Parallel TEST time " << t1 << std::endl;

            cv::extractChannel (for_each, cblue, 0 );
            cv::imshow("cropped_BGR",frame1);
            cv::imshow("mod_BLUE",cblue);

           if (cv::waitKey(30) == 27) 
           {
                std::cout << "esc key is pressed by user" <<std::endl;
                 break; 
           }
    }
    return 0;

}

我不知道这个错误是从哪里来的，任何帮助都将不胜感激，TIA。

4

2 回答 2

3
于 2018-08-27T09:12:50.703 回答
0

确实，最好的答复之一。非常感谢 ！！！

sol3：效果很好

double t1 = (double)cv::getTickCount();
    std::vector<cv::Mat> channels { cblue, cgreen, cred};
    cv::merge(channels, for_each);
    for_each.forEach<Pixel>(Operator());
    cv::extractChannel (for_each, cblue, 2 );
t1 = ((double)cv::getTickCount() - t1)/cv::getTickFrequency();
std::cout<< "Parallel TEST time " << t1 << std::endl;

sol1：但它仍然给我

错误：“类 std::vector”没有名为“forEach”的成员 channels.forEach(Operator()); ^~~~~~~ 16_vector_foreach_changedmaincode.cpp:54:31: error: '>' token channels.forEach(Operator()) 之前的预期主表达式；

我的意图是

    frame2.copyTo(cblue);
    frame2.copyTo(cgreen);
    frame2.copyTo(cred);

double t1 = (double)cv::getTickCount();
    //std::vector<cv::Mat> channels { cblue, cgreen, cred};
    std::vector<cv::Mat> channels(3);
    cv::Mat& cblue = channels[0], &cgreen=channels[1], &cred=channels[2];
    //cv::merge(channels, for_each);
    channels.forEach<Pixel>(Operator());
    cv::extractChannel (channels, cblue, 2 );
t1 = ((double)cv::getTickCount() - t1)/cv::getTickFrequency();
std::cout<< "Parallel TEST time " << t1 << std::endl;

我也必须在这里使用合并运算符吗？@api55

于 2018-08-29T10:34:06.680 回答