MPSImageHistogramInfo(3MetalPerformanceShaders.framewoMPSImageHistogramInfo(3)
NAME
MPSImageHistogramInfo - Specifies information to compute the histogram
for channels of an image.
SYNOPSIS
#include <MPSImageHistogram.h>
Public Attributes
NSUInteger numberOfHistogramEntries
BOOL histogramForAlpha
vector_float4 minPixelValue
vector_float4 maxPixelValue
Detailed Description
Specifies information to compute the histogram for channels of an
image.
MPSImageHistogram.h MetalPerformanceShaders.framework
Copyright:
Copyright (c) 2015 Apple Inc. All rights reserved.
MetalPerformanceShaders histogram filters
Member Data Documentation
BOOL MPSImageHistogramInfo::histogramForAlpha
Specifies whether the histogram for the alpha channel should be
computed or not.
vector_float4 MPSImageHistogramInfo::maxPixelValue
Specifies the maximum pixel value. Any pixel value greater than this
will be clipped to this value (for the purposes of histogram
calculation), and assigned to the first histogram entry. This maximum
value is applied to each of the four channels separately.
vector_float4 MPSImageHistogramInfo::minPixelValue
Specifies the minimum pixel value. Any pixel value less than this will
be clipped to this value (for the purposes of histogram calculation),
and assigned to the first histogram entry. This minimum value is
applied to each of the four channels separately.
NSUInteger MPSImageHistogramInfo::numberOfHistogramEntries
Specifies the number of histogram entries, or 'bins' for each channel.
For example, if you want 256 histogram bins then
numberOfHistogramEntries must be set to 256. The value stored in each
histogram bin is a 32-bit unsigned integer. The size of the histogram
buffer in which these bins will be stored should be >=
numberOfHistogramEntries * sizeof(uint32_t) * number of channels in the
image. numberOfHistogramEntries must be a power of 2 and is a minimum
of 256 bins.
Author
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MetalPerformanceShaders.framework from the source code.
Version MetalPerformanceShaders-Wed Jul 20 2016 MPSImageHistogramInfo(3)
Mac OS X 10.12.3 - Generated Tue Feb 7 18:14:02 CST 2017