Method

VipsImagecompass

Declaration [src]

int
vips_compass (
  VipsImage* in,
  VipsImage** out,
  VipsImage* mask,
  ...
)

Description [src]

This convolves in with mask times times, rotating mask by angle each time. By default, it comvolves twice, rotating by 90 degrees, taking the maximum result.

::: tip “Optional arguments” * times: gint, how many times to rotate and convolve * angle: VipsAngle45, rotate mask by this much between colvolutions * combine: VipsCombine, combine results like this * precision: VipsPrecision, precision for blur, default float * layers: gint, number of layers for approximation * cluster: gint, cluster lines closer than this distance

::: seealso vips_conv().

Parameters

`out`	`VipsImage`
	Output image.
	The argument will be set by the function.
	The instance takes ownership of the data, and is responsible for freeing it.
`mask`	`VipsImage`
	Convolve with this mask.
	The data is owned by the caller of the function.
`...`	`none`
	`NULL`-terminated list of optional named arguments.

Return value

Returns:	`int`
	0 on success, -1 on error.