.TH "MPSCNNSpatialNormalization" 3 "Mon Jul 9 2018" "Version MetalPerformanceShaders-119.3" "MetalPerformanceShaders.framework" \" -*- nroff -*-
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.SH NAME
MPSCNNSpatialNormalization
.SH SYNOPSIS
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.PP
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\fC#import <MPSCNNNormalization\&.h>\fP
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Inherits \fBMPSCNNKernel\fP\&.
.SS "Instance Methods"

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.RI "(nonnull instancetype) \- \fBinitWithDevice:kernelWidth:kernelHeight:\fP"
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.RI "(nullable instancetype) \- \fBinitWithCoder:device:\fP"
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.RI "(nonnull instancetype) \- \fBinitWithDevice:\fP"
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.SS "Properties"

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.RI "float \fBalpha\fP"
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.RI "float \fBbeta\fP"
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.RI "float \fBdelta\fP"
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.SS "Additional Inherited Members"
.SH "Detailed Description"
.PP 
This depends on Metal\&.framework  Specifies the spatial normalization filter\&. The spatial normalization for a feature channel applies the filter over local regions which extend spatially, but are in separate feature channels (i\&.e\&., they have shape 1 x kernelWidth x kernelHeight)\&. For each feature channel, the function computes the sum of squares of X inside each rectangle, N2(i,j)\&. It then divides each element of X as follows: Y(i,j) = X(i,j) / (delta + alpha/(kw*kh) * N2(i,j))^beta, where kw and kh are the kernelWidth and the kernelHeight\&. It is the end-users responsibility to ensure that the combination of the parameters delta and alpha does not result in a situation where the denominator becomes zero - in such situations the resulting pixel-value is undefined\&. 
.SH "Method Documentation"
.PP 
.SS "\- (nullable instancetype) \fBinitWithCoder:\fP (NSCoder *__nonnull) aDecoder(nonnull id< MTLDevice >) device"
\fBNSSecureCoding\fP compatability  While the standard NSSecureCoding/NSCoding method -initWithCoder: should work, since the file can't know which device your data is allocated on, we have to guess and may guess incorrectly\&. To avoid that problem, use initWithCoder:device instead\&. 
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\fBParameters:\fP
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\fIaDecoder\fP The NSCoder subclass with your serialized \fBMPSKernel\fP 
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\fIdevice\fP The MTLDevice on which to make the \fBMPSKernel\fP 
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\fBReturns:\fP
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\fBA\fP new \fBMPSKernel\fP object, or nil if failure\&. 
.RE
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Reimplemented from \fBMPSCNNKernel\fP\&.
.SS "\- (nonnull instancetype) initWithDevice: (nonnull id< MTLDevice >) device"
Standard init with default properties per filter type 
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\fBParameters:\fP
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\fIdevice\fP The device that the filter will be used on\&. May not be NULL\&. 
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\fBReturns:\fP
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\fBA\fP pointer to the newly initialized object\&. This will fail, returning nil if the device is not supported\&. Devices must be MTLFeatureSet_iOS_GPUFamily2_v1 or later\&. 
.RE
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Reimplemented from \fBMPSCNNKernel\fP\&.
.SS "\- (nonnull instancetype) \fBinitWithDevice:\fP (nonnull id< MTLDevice >) device(NSUInteger) kernelWidth(NSUInteger) kernelHeight"
Initialize a spatial normalization filter 
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\fBParameters:\fP
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\fIdevice\fP The device the filter will run on 
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\fIkernelWidth\fP The width of the kernel 
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\fIkernelHeight\fP The height of the kernel 
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\fBReturns:\fP
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\fBA\fP valid \fBMPSCNNSpatialNormalization\fP object or nil, if failure\&.
.RE
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NOTE: For now, kernelWidth must be equal to kernelHeight 
.SH "Property Documentation"
.PP 
.SS "\- alpha\fC [read]\fP, \fC [write]\fP, \fC [nonatomic]\fP, \fC [assign]\fP"
The value of alpha\&. Default is 1\&.0\&. Must be non-negative\&. 
.SS "\- beta\fC [read]\fP, \fC [write]\fP, \fC [nonatomic]\fP, \fC [assign]\fP"
The value of beta\&. Default is 5\&.0 
.SS "\- delta\fC [read]\fP, \fC [write]\fP, \fC [nonatomic]\fP, \fC [assign]\fP"
The value of delta\&. Default is 1\&.0 

.SH "Author"
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Generated automatically by Doxygen for MetalPerformanceShaders\&.framework from the source code\&.