How to give YUV data input to Opencv?

Question

I am a beginner to Opencv. In my new opencv project I have to capture video frames from a camera device and need to give them to the opencv for processing, But now my came

Answer 1

I asked a similar question recently here OpenCV capture YUYV from camera without RGB conversion

An openCV VideoCapture object is the easiest way to capture video, but it automatically converts the frames to BGR format. You can disable this with videoCapture.set(CV_CAP_PROP_CONVERT_RGB, false)

For some reason that particular command didn't work with my camera so I was forced to use V4L2 library to read frames instead (this is the same library that videoCapture uses). Sample video capture code for V4L2: http://linuxtv.org/downloads/v4l-dvb-apis/capture-example.html. I then stored the frames in a cv::Mat for processing.

You can store data of any format in an openCV Mat, but some operations make assumptions about what format the data is in. For example imshow will assume the data is either BGR or greyscale format. If your data isn't one of those formats your image will look wrong.