How to display multiple images in one window? - OpenCV Q&A …
Since images are numpy arrays in OpenCV, we could use concatenate, vstack or hstack to help us achieve the task. The comments in the code should be self explanatory but one thing to be …
Extract a RotatedRect area - OpenCV Q&A Forum
Can someone explain to me how you would extract a RotatedRect to a submatrix image. Basically, using something like cvSetImageROI to extract the inverted rectangular area from …
OpenCV - Ask OpenCV Questions, Get OpenCV Answers
Oct 16, 2025 · OpenCV (Open Source Computer Vision Library) is an open source computer vision and machine learning (AI) software library.
Hi , I have some error in BaseLoaderCallback in ... - OpenCV Q&A …
Jan 9, 2017 · Hi , I have some error in BaseLoaderCallback in android Studio Please look at the code and possibly guide me
set ROI in cv::Mat - OpenCV Q&A Forum
Greetings. I need to set the region of interest or ROI in an image cv::Mat. I have seen that there are functions for IplImage images, but I could not find the equivalent functions for cv::Mat. …
Conversion from RGB to HSI - OpenCV Q&A Forum
May 22, 2015 · Hi to all! I need a color conversion from RGB (or BGR) color space into HSI color space. But openCV implements only RGBtoHSV or RGBtoHLS color conversion. Is there a …
OpenCV with CUDA support – unsupported visual studio version …
Mar 26, 2025 · Good morning, I am currently experiencing an issue building OpenCV with Cuda support. Following the process of using cmake to configure and generate I am building in …
how to draw the curve line? - OpenCV Q&A Forum
I think your problem isn't that you don't know how to draw a curve but that you don't know how to define a curve. From your so called point x and point y in the figure, infinite curves can be …
Error: OpenCV(4.11.0) error: (-5:Bad argument) in function 'imshow'
Apr 4, 2025 · I think there was an update to the input sent to opencv in version 4.11 and it especially affects Linux-based systems. The question is, how should we adjust the array …
Video frame to numpy array - OpenCV Q&A Forum
Oct 4, 2017 · I just started with OpenCV. I have a small video clip that I want to process frame by frame. That's why I want to be able to access the pixel RGB values via Numpy arrays. What is …