opencv/cxcore.go
func (img *IplImage) GetCOI() int {
	coi := C.cvGetImageCOI((*C.IplImage)(img))
	return int(coi)
}
func (img *IplImage) GetCOI() int {
	coi := C.cvGetImageCOI((*C.IplImage)(img))
	return int(coi)
}
/* Retrieves image Channel Of Interest */