Hi, I was wondering if there was a way to read in greyscale video files in OpenCV. I currently have to convert greyscale video into RGB format outside OpenCV, read it in and again convert it to greyscale using cvtColor() function... Is there anyway I can omit these counterintuitive steps and just grab greyscale frames from original video files?
If you have grayscale video originally, then reading a frame from the stream, using the videoCapture interface will give you a fake BGR channel result, because all three channels will have the same intensity values set. You do not need a convert anymore, and you can basically split channels.
VideoCapture cap(0); // open the default camera
Mat frame, channel;
vector<Mat> channels;
cap >> frame; // get a new frame from camera
split(frame, channels);
Mat intensities_grey = channels[0];
Thanks Steven. In doing this, I get segmentation fault in FFMPEG_proxy (CvCapture_FFMPEG_proxy class). Is there any special setting for the FFMPEG decoder I have to implement? I am completely baffled with the complexity of this decoder so any help is greatly appreciated.
Asked: 2013-09-16 14:05:00 -0600
Seen: 2,295 times
Last updated: Sep 17 '13
how do you convert to grb ? if you have a way to read that video, you might as well skip the videocapture, and use the frames directly.
I convert the original video to RGB outside OpenCV using VLC Media Player.