Please make sure you have already specified the IP camera URLs properly. You can choose whether you want to capture from IP cameras (capture_source) or USB cameras (capture_index).
#Opencv camera capture how to#
"rtsp://192.168.0.100/profile2/media.smp" This tutorial guide, How to Capture videos from web camera using OpenCV and visual studio. Void CameraStreamer::captureFrame(int index) Note: I am using std:thread as a camera capture worker and concurrency:concurrent_queue as a frame container.Īfter that, let’s make the class implementation in “CameraStreamer.cpp”:ĬameraStreamer::CameraStreamer(vector stream_source)ĬameraStreamer::CameraStreamer(vector capture_index) main camera capturing process which will be done by the thread(s) initialize and start the camera capturing process(es) The only thing that comes to my mind is if OpenCVs functionality for this does not work, you can only get the handle to this window manually and close it via this handle. this holds thread(s) which run the camera capture process this holds queue(s) which hold images from each camera this holds OpenCV VideoCapture pointers Each thread will capture images from a single camera, so the number of threads will be determined by the number of cameras. In addition, to make it even better for further application (e.g.: motion detection), I made it object oriented.įirst, let’s make a header file which will contain all class members (attributes and functions) declaration. Thus, I need to improve it by using multi-thread approach. However, it is not quite good approach to use just a single thread to handle all of the capturing processes. It avoids the conversion from JPEG format to OpenCV format which would slow our process. PiRGBArray gives us the advantage of reading the frames from Raspberry Pi camera as NumPy arrays, making it compatible with the OpenCV. Previously, I have managed to create a simple program to capture images from multiple cameras ( click here). PiRGBArray() gives us a 3-dimensional RGB array organized (rows, columns, colors) from an unencoded RGB capture.
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