mpsimagestatisticsmeanandvariance(3) [mojave man page]
MPSImageStatisticsMeanAndVariance(3) MetalPerformanceShaders.framework MPSImageStatisticsMeanAndVariance(3) NAME
MPSImageStatisticsMeanAndVariance SYNOPSIS
#import <MPSImageStatistics.h> Inherits MPSUnaryImageKernel. Instance Methods (nonnull instancetype) - initWithDevice: (nullable instancetype) - initWithCoder:device: Properties MTLRegion clipRectSource Additional Inherited Members Detailed Description The MPSImageStatisticsMeanAndVariance computes the mean and variance for a given region of an image. The mean and variance values are written to the destination image at the following pixel locations: o mean value is written at pixel location (0, 0) o variance value is written at pixel location (1, 0) Method Documentation - (nullable instancetype) initWithCoder: (NSCoder *__nonnull) aDecoder(nonnull id< MTLDevice >) device NSSecureCoding 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. Parameters: aDecoder The NSCoder subclass with your serialized MPSKernel device The MTLDevice on which to make the MPSKernel Returns: A new MPSKernel object, or nil if failure. Reimplemented from MPSUnaryImageKernel. - (nonnull instancetype) initWithDevice: (nonnull id< MTLDevice >) device Specifies information to apply the statistics mean operation on an image. Parameters: device The device the filter will run on Returns: A valid MPSImageStatisticsMeanAndVariance object or nil, if failure. Reimplemented from MPSUnaryImageKernel. Property Documentation - clipRectSource [read], [write], [nonatomic], [assign] The source rectangle to use when reading data. A MTLRegion that indicates which part of the source to read. If the clipRectSource does not lie completely within the source image, the intersection of the image bounds and clipRectSource will be used. The clipRectSource replaces the MPSUnaryImageKernel offset parameter for this filter. The latter is ignored. Default: MPSRectNoClip, use the entire source texture. The clipRect specified in MPSUnaryImageKernel is used to control the origin in the destination texture where the mean value is written. Author Generated automatically by Doxygen for MetalPerformanceShaders.framework from the source code. Version MetalPerformanceShaders-100 Thu Feb 8 2018 MPSImageStatisticsMeanAndVariance(3)
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MPSImageThresholdToZero(3) MetalPerformanceShaders.framework MPSImageThresholdToZero(3) NAME
MPSImageThresholdToZero SYNOPSIS
#import <MPSImageThreshold.h> Inherits MPSUnaryImageKernel. Instance Methods (nonnull instancetype) - initWithDevice:thresholdValue:linearGrayColorTransform: (nonnull instancetype) - initWithDevice: (nullable instancetype) - initWithCoder:device: Properties float thresholdValue const float * transform Additional Inherited Members Detailed Description The MPSImageThresholdToZero filter applies a fixed-level threshold to each pixel in the image. The threshold functions convert a single channel image to a binary image. If the input image is not a single channel image, convert the inputimage to a single channel luminance image using the linearGrayColorTransform and then apply the threshold. The ThresholdToZero function is: destinationPixelValue = sourcePixelValue > thresholdValue ? sourcePixelValue : 0 Method Documentation - (nullable instancetype) initWithCoder: (NSCoder *__nonnull) aDecoder(nonnull id< MTLDevice >) device NSSecureCoding 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. Parameters: aDecoder The NSCoder subclass with your serialized MPSKernel device The MTLDevice on which to make the MPSKernel Returns: A new MPSKernel object, or nil if failure. Reimplemented from MPSUnaryImageKernel. - (nonnull instancetype) initWithDevice: (nonnull id< MTLDevice >) device Standard init with default properties per filter type Parameters: device The device that the filter will be used on. May not be NULL. Returns: a 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. Reimplemented from MPSUnaryImageKernel. - (nonnull instancetype) initWithDevice: (nonnull id< MTLDevice >) device(float) thresholdValue(const float *__nullable) transform initialize a MPSImageThresholdToZero filter Parameters: device The device the filter will run on thresholdValue The threshold value to use transform This matrix is an array of 3 floats. The default if no transform is specifed is BT.601/JPEG: {0.299f, 0.587f, 0.114f}; Property Documentation - thresholdValue [read], [nonatomic], [assign] The threshold value used to init the threshold filter - transform [read], [nonatomic], [assign] The color transform used to init the threshold filter Author Generated automatically by Doxygen for MetalPerformanceShaders.framework from the source code. Version MetalPerformanceShaders-100 Thu Feb 8 2018 MPSImageThresholdToZero(3)