mpsimagethresholdtozero(3) [mojave man page]
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)
Check Out this Related Man Page
MPSImageThresholdBinary(3) MetalPerformanceShaders.framework MPSImageThresholdBinary(3) NAME
MPSImageThresholdBinary SYNOPSIS
#import <MPSImageThreshold.h> Inherits MPSUnaryImageKernel. Instance Methods (nonnull instancetype) - initWithDevice:thresholdValue:maximumValue:linearGrayColorTransform: (nullable instancetype) - initWithCoder:device: (nonnull instancetype) - initWithDevice: Properties float thresholdValue float maximumValue const float * transform Additional Inherited Members Detailed Description MPSImageThreshold.h MetalPerformanceShaders Copyright: Copyright (c) 2015 Apple Inc. All rights reserved. MetalPerformanceShaders thresholding filters The MPSThreshold 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 ThresholdBinary function is: destinationPixelValue = sourcePixelValue > thresholdValue ? maximumValue : 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(float) maximumValue(const float *__nullable) transform initialize a MPSImageThresholdBinary filter Parameters: device The device the filter will run on thresholdValue The threshold value to use maximumValue The maximum 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 - maximumValue [read], [nonatomic], [assign] The maximum value used to init the threshold filter - 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 MPSImageThresholdBinary(3)