The resulting numbering depends on how many rows you want there to be. With the program I will show you how to make, you can specify the number of rows before you run the program. For example, here is the original image: Here is the numbered image when you specify 4 rows: Here is the … Read more
This code snippet is to demonstrate how to compute Sobel 3×3 derivatives convolving the image with Sobel kernels. You can easily extend to different kernel sizes giving the kernel radius as input to my_sobel, and creating the appropriate kernel. #include <opencv2\opencv.hpp> #include <iostream> using namespace std; using namespace cv; void my_sobel(const Mat1b& src, Mat1s& dst, … Read more
The shape attribute of a numpy.array is the number of elements in each dimension. The first element is the height, the second the width and the third the number of channels. A pygame.Surface can be generated by pygame.image.frombuffer. The 1st argument can be a numpy.array and the 2nd argument is the format (RGB or RGBA). … Read more
You were almost there. One problem though: case CV_EVENT_RBUTTONUP needs to break, and I would also add a break on default case. The following code sets the ROI, performs a simple grayscale processing on it and then copies the processed ROI back to the original image. For testing purposes I changed your code to use … Read more
Depth and Color streams are not taken from the same point so they do not correspond to each other perfectly. Also they FOV (field of view) is different. cameras IR/Depth FOV 58.5° x 45.6° Color FOV 62.0° x 48.6° distance between cameras 25mm my corrections for 640×480 resolution for both streams if (valid depth) { … Read more
Here’s a RTSP stream to video widget. I would recommend creating another thread for obtaining the frames as cv2.VideoCapture.read() is blocking. This can be expensive and cause latency as the main thread has to wait until it has obtained a frame. By putting this operation into a separate thread that just focuses on grabbing frames … Read more
Actually, you don’t have to swap the different quadrants, it’s needed only if you’re a human and want a more natural looking visualization of the FFT result (i.e. with the 0 frequency in the middle, negative frequencies left/bottom and positive frequencies up/right). To invert the FFT, you need to pass the result of the forward … Read more
From openCV wiki : Finds the convexity defects of a contour. So you should include it in your loop. std::vector<Vec4i> defects; vector<cv::vector<int> >hull( contours.size() ); for (int i = 0; i < contours.size(); i++) { convexHull( contours[i], hull[i], false ); convexityDefects(contours[i], hull[i], defects[i]); } Also, as you mentioned, in wiki is said: hull – Output … Read more
If you DID explicitly set up linking with all the necessary libraries, but linking errors still show, you might be mixing up 64/32 bit libraries and application. I.e. make sure that all library includes point to 32 bit version of libraries if you are building 32 bit application.
I had the exact same error using yolov5, on windows 10. Rebuilding the library by typing pip uninstall opencv-python then pip install opencv-python worked for me.