Hi,
How to access the value of pixel in structure cvMat ? I need access the pixels in a image with 3 channels. Can you help me ?
Thank you.
If you use Opencv 3.0 I would prefer extractChannel(input, output, channel) instead of split(). I don't now if this function exists in OpenCV 2.X. But instead of extracting a COI you can directly access to a pixel by using:
uchar pixelValue = img.at<vec3b>(Point(x, y))[channel];
Where channel is the channel you like to read between 0 and 2 for a 3channel image. Consider that Vec3b is for 3 channel byte Mat, if you have an int Mat use Vec3i and so on.
Asked: Feb 20 '15
Seen: 297 times
Last updated: Feb 20 '15
You could start by separating the 3 channels using the split( ) function, and then this statement accesses pixel values ->
img.at<uchar>(Point(x, y));Hope this helps.You are right @matman. It would definitely be better to use OpenCV 3.0.0 functionality.
Thank you!