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Showing content from http://libvips.github.io/libvips/API/current/method.Image.hough_line.html below:

Vips.Image.hough_line

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

Find the line Hough transform for in. in must have one band. out has one band, with pixels being the number of votes for that line. The X dimension of out is the line angle in 0 - 180 degrees, the Y dimension is the distance of the closest part of that line to the origin in the top-left.

Use width height to set the size of the parameter space image (out), that is, how accurate the line determination should be.

Optional arguments

• width: gint, horizontal size of parameter space
• height: gint, vertical size of parameter space

This method is not directly available to language bindings.

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.

Type: int

0 on success, -1 on error.

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