opencv/highgui.go
func (win *Window) ShowImage(image *IplImage) {
	win.image = image
	C.cvShowImage(win.name_c, unsafe.Pointer(image))
}
func (win *Window) ShowImage(image *IplImage) {
	win.image = image
	C.cvShowImage(win.name_c, unsafe.Pointer(image))
}
/* display image within window (highgui windows remember their content) */