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VideoCapture returns BGR images, so the type will be Vec3b.
The image type is a combination of depth and channels.
depth - the type of pixel's element channels - the number of elements in pixel
For depth OpenCV uses constants:
CV_8U - unsigned char CV_8S - signed char CV_16U - unsigned short CV_16S - signed short CV_32S - int CV_32F - float CV_64F - double
So 3-channel 8-bit image will have CV_8UC3 type (CV_8U depth and 3 Channels).
You can use depth() function to know image depth and channels() function to know channels number.
