Method
VipsImageconva
Declaration [src]
int
vips_conva (
VipsImage* in,
VipsImage** out,
VipsImage* mask,
...
)
Description [src]
Optional arguments:
layers: %gint, number of layers for approximationcluster: %gint, cluster lines closer than this distance
Perform an approximate integer convolution of in with mask.
This is a low-level operation, see
vips_conv() for something more convenient.
The output image
always has the same VipsBandFormat as the input image.
Elements of mask are converted to
integers before convolution.
Larger values for layers give more accurate
results, but are slower. As layers approaches the mask radius, the
accuracy will become close to exact convolution and the speed will drop to
match. For many large masks, such as Gaussian, layers need be only 10% of
this value and accuracy will still be good.
Smaller values of cluster will give more accurate results, but be slower
and use more memory. 10% of the mask radius is a good rule of thumb.
See also: vips_conv().
| This method is not directly available to language bindings. |