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[英]OpenCV function to compute product of array elements that is similar to MATLAB's prod?
[英]Is there a function similar MATLAB's 'impixelinfo()' available in OpenCV?
我在OpenCV中搜索的函數類似於MATLAB中的impixelinfo()
。
impixelinfo()
向您展示
(x, y)
和 光標在圖像中懸停的像素強度,
喜歡:
OpenCV中是否有任何實現? 有沒有人創建它的個人版本?
你可以這樣做:
#include <opencv2/opencv.hpp>
#include <iostream>
using namespace std;
using namespace cv;
Mat img;
void
CallBackFunc(int event,int x,int y,int flags,void* userdata)
{
if(event==EVENT_MOUSEMOVE){
cout << "Pixel (" << x << ", " << y << "): " << img.at<Vec3b>(y,x) << endl;
}
}
int main()
{
// Read image from file
img=imread("demo.jpg");
// Check it loaded
if(img.empty())
{
cout << "Error loading the image" << endl;
exit(1);
}
//Create a window
namedWindow("ImageDisplay",1);
// Register a mouse callback
setMouseCallback("ImageDisplay",CallBackFunc,nullptr);
// Main loop
while(true){
imshow("ImageDisplay",img);
waitKey(50);
}
}
作為有用的評論的結果,我(希望)改進了代碼並且現在處理灰度圖像,並且還將RGB排序設置為更類似於非OpenCV愛好者可能期望的 - 即RGB而不是BGR。 更新的功能如下:
void
CallBackFunc(int event,int x,int y,int flags,void* userdata)
{
if(event==EVENT_MOUSEMOVE){
// Test if greyscale or color
if(img.channels()==1){
cout << "Grey Pixel (" << x << ", " << y << "): " << (int)img.at<uchar>(y,x) << endl;
} else {
cout << "RGB Pixel (" << x << ", " << y << "): " << (int)img.at<Vec3b>(y,x)[2] << "/" << (int)img.at<Vec3b>(y,x)[1] << "/" << (int)img.at<Vec3b>(y,x)[0] << endl;
}
}
}
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