Method
VipsImagehough_circle
Declaration [src]
int
vips_hough_circle (
VipsImage* in,
VipsImage** out,
...
)
Description [src]
Optional arguments
scale: scale down dimensions by this muchmin_radius: smallest radius to search formax_radius: largest radius to search for
Find the circular Hough transform of an image. in must be one band, with
non-zero pixels for image edges. out is three-band, with the third channel
representing the detected circle radius. The operation scales the number of
votes by circle circumference so circles of differing size are given equal weight.
The output pixel at (x, y, band) is the strength of the circle centred on (x, y) and with radius (band).
Use max_radius and min_radius to set the range of radii to search for.
Use scale to set how in coordinates are scaled to out coordinates. A
scale of 3, for example, will make out 1/3rd of the width and height of
in, and reduce the number of radii tested (and hence the number of bands
int out) by a factor of three as well.
See also
This method is not directly available to language bindings.
Parameters
out-
Type:
VipsImageOutput image.
The argument will be set by the function. The caller of the method takes ownership of the returned data, and is responsible for freeing it. ...-
Type:
NULL-terminated list of optional named arguments.