opencv/cv.go
func Canny(image, edges *IplImage, threshold1, threshold2 float64, aperture_size int) {
	C.cvCanny(unsafe.Pointer(image), unsafe.Pointer(edges),
		C.double(threshold1), C.double(threshold2),
		C.int(aperture_size),
	)
}
func Canny(image, edges *IplImage, threshold1, threshold2 float64, aperture_size int) {
	C.cvCanny(unsafe.Pointer(image), unsafe.Pointer(edges),
		C.double(threshold1), C.double(threshold2),
		C.int(aperture_size),
	)
}
//CVAPI(void)  cvCvtColor( const CvArr* src, CvArr* dst, int code );
/* Runs canny edge detector */