opencv/imgproc.go
func (image *IplImage) FindContours(mode, method int, offset Point) *Seq {
	storage := C.cvCreateMemStorage(0)
	header_size := (C.size_t)(unsafe.Sizeof(C.CvContour{}))
	var seq *C.CvSeq
	C.cvFindContours(
		unsafe.Pointer(image),
		storage,
		&seq,
		C.int(header_size),
		C.int(mode),
		C.int(method),
		C.cvPoint(C.int(offset.X), C.int(offset.Y)))

	return (*Seq)(seq)
}
func (image *IplImage) FindContours(mode, method int, offset Point) *Seq {
	storage := C.cvCreateMemStorage(0)
	header_size := (C.size_t)(unsafe.Sizeof(C.CvContour{}))
	var seq *C.CvSeq
	C.cvFindContours(
		unsafe.Pointer(image),
		storage,
		&seq,
		C.int(header_size),
		C.int(mode),
		C.int(method),
		C.cvPoint(C.int(offset.X), C.int(offset.Y)))

	return (*Seq)(seq)
}
/* Returns a Seq of countours in an image, detected according to the parameters.
   Caller must Release() the Seq returned */