The form of the Q matrix is given as follows: In that image, cx and cy are the coordinates of the principal point in the left camera (if you did stereo matching with the left camera dominant), c’x is the x-coordinate of the principal point in the right camera (cx and c’x will be the … Read more
I will propose an answer that works fast and perfectly if you are looking for exact match both in size and in image values. The idea is to calculate a brute force search of the wanted h x w template in a larger H x W image. The bruteforce approach would consist in looking at … Read more
Reading (cam.read()) from a VideoCapture returns a tuple (return value, image). With the first item you check wether the reading was successful, and if it was then you proceed to use the returned image. This is documented at https://opencv-tutorial.readthedocs.io/en/latest/intro/intro.html#capture-live-video
Take for reference my original code, which simply detects squares on an image. That means that in the main method of the application you would write something like the following pseudo-code to call find_squares(): Mat image = imread(“test.jpg”, 1); // Detect all regions in the image that are similar to a rectangle vector<vector<Point> > squares; … Read more
As you already got, you don’t need ellipse fitting, but ellipse detection. You can find in my other answer two papers with C++ code available. I’ll report here for completeness: L. Libuda, I. Grothues, K.-F. Kraiss, Ellipse detection in digital image data using geometric features, in: J. Braz, A. Ranchordas, H. Arajo, J. Jorge (Eds.), … Read more
Probably you have problem with special meaning of \ in text – like \t or \n Use \\ in place of \ imgloc = “F:\\Kyle\\Desktop\\Coinjar\\Test images\\ten.png” or use prefix r” (and it will treat it as raw text without special codes) imgloc = r”F:\Kyle\Desktop\Coinjar\Test images\ten.png” EDIT: Some modules accept even / like in Linux path … Read more
The problem might be the codec you are using. A simple test to make sure your stuff is working properly is to simply retrieve frames from a webcam and write them on a video file: // Load input video cv::VideoCapture input_cap(argv[1]); if (!input_cap.isOpened()) { std::cout << “!!! Input video could not be opened” << std::endl; … Read more
It’s been almost 2 years since I’ve asked this question and I think it’s time to answer it: the source code that implements this filter using OpenCV can be found in my GitHub repo. The implementation is based on the documentation of Adobe Flash DisplacementMapFilter. There’s another tutorial I recommend people to read: Psyarkâs DisplacementMapFilter … Read more
In my situation, when using Pycharm to import cv2, it returned ImportError: DLL not found. However, using python intepreter to import I got *ImportError: … not a win32 DLL … * instead. So, in this situation, I had to download Visual C++ 2015 redistribution package and problem solved. So to anyone who meets the same … Read more
vImage is a pretty fast way to do it. Requires ios5 though. The call says ARGB but it works for the BGRA you get from the buffer. This also has the advantage that you can cut out a part of the buffer and rotate that. See my answer here – (unsigned char*) rotateBuffer: (CMSampleBufferRef) sampleBuffer … Read more