Vips.Image.hough_circle (original) (raw)

Method

Vips Imagehough_circle

Declaration [src]


int
vips_hough_circle (
  VipsImage* in,
  VipsImage** out,
  ...
)

Description [src]

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. Ascale of 3, for example, will make out 1/3rd of the width and height ofin, and reduce the number of radii tested (and hence the number of bands int out) by a factor of three as well.

Optional arguments

scale: gint, scale down dimensions by this much
min_radius: gint, smallest radius to search for
max_radius: gint, largest radius to search for

This method is not directly available to language bindings.

Parameters

out

Type: VipsImage

Output 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.

Return value

Type: int

0 on success, -1 on error.

Vips.Image.hough_circle (original) (raw)

Method