mpsimagegaussianpyramid(3) mojave man page | unix.com

MPSImageGaussianPyramid(3)				 MetalPerformanceShaders.framework				MPSImageGaussianPyramid(3)

NAME
       MPSImageGaussianPyramid

SYNOPSIS
       #import <MPSImageConvolution.h>

       Inherits MPSImagePyramid.

   Additional Inherited Members
Detailed Description
       The Gaussian image pyramid is constructed as follows: First the zeroth level mipmap of the input image is filtered with the specified
       convolution kernel. The default the convolution filter kernel is

       k = w w^T, where w = [ 1/16,  1/4,  3/8,  1/4,  1/16 ]^T,

	but the user may also tweak this kernel with a centerWeight parameter: 'a':

       k = w w^T, where w = [ (1/4 - a/2),  1/4,  a,  1/4,  (1/4 - a/2) ]^T

	or the user can provide a completely custom kernel. After this the image is downsampled by removing all odd rows and columns, which
       defines the next level in the Gaussian image pyramid. This procedure is continued until every mipmap level present in the image texture are
       filled with the pyramid levels.

       In case of the Gaussian pyramid the user must run the operation in-place using: inPlaceTexture:fallbackCopyAllocator:, where the fallback
       allocator is ignored.

Author
       Generated automatically by Doxygen for MetalPerformanceShaders.framework from the source code.

Version MetalPerformanceShaders-100				  Thu Feb 8 2018					MPSImageGaussianPyramid(3)