mpsimagethresholdtozeroinverse(3) [mojave man page]
MPSImageThresholdToZeroInverse(3) MetalPerformanceShaders.framework MPSImageThresholdToZeroInverse(3) NAME
MPSImageThresholdToZeroInverse SYNOPSIS
#import <MPSImageThreshold.h> Inherits MPSUnaryImageKernel. Instance Methods (nonnull instancetype) - initWithDevice:thresholdValue:linearGrayColorTransform: (nullable instancetype) - initWithCoder:device: (nonnull instancetype) - initWithDevice: Properties float thresholdValue const float * transform Additional Inherited Members Detailed Description The MPSImageThresholdToZeroInverse 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 ThresholdToZeroINverse function is: destinationPixelValue = sourcePixelValue > thresholdValue ? 0 : sourcePixelValue 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 MPSImageThresholdToZeroInverse 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 MPSImageThresholdToZeroInverse(3)
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MPSImageSobel(3) MetalPerformanceShaders.framework MPSImageSobel(3) NAME
MPSImageSobel SYNOPSIS
#import <MPSImageConvolution.h> Inherits MPSUnaryImageKernel. Instance Methods (nonnull instancetype) - initWithDevice: (nonnull instancetype) - initWithDevice:linearGrayColorTransform: (nullable instancetype) - initWithCoder:device: Properties const float * colorTransform Additional Inherited Members Detailed Description The MPSImageSobel implements the Sobel filter. When the color model (e.g. RGB, two-channel, grayscale, etc.) of source and destination textures match, the filter is applied to each channel separately. If the destination is monochrome (single channel) but source multichannel, the pixel values are converted to grayscale before applying Sobel operator using the linear gray color transform vector (v). Luminance = v[0] * pixel.x + v[1] * pixel.y + v[2] * pixel.z; 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 Initialize a Sobel filter on a given device using the default color transform. Default: BT.601/JPEG {0.299f, 0.587f, 0.114f} For non-default conversion matrices, use -initWithDevice:linearGrayColorTransform: Parameters: device The device the filter will run on Returns: A valid object or nil, if failure. Reimplemented from MPSUnaryImageKernel. - (nonnull instancetype) initWithDevice: (nonnull id< MTLDevice >) device(const float *__nonnull) transform Initialize a Sobel filter on a given device with a non-default color transform Parameters: device The device the filter will run on transform Array of three floats describing the rgb to gray scale color transform. Luminance = transform[0] * pixel.x + transform[1] * pixel.y + transform[2] * pixel.z; Returns: A valid object or nil, if failure. Property Documentation - colorTransform [read], [nonatomic], [assign] Returns a pointer to the array of three floats used to convert RGBA, RGB or RG images to the destination format when the destination is monochrome. Author Generated automatically by Doxygen for MetalPerformanceShaders.framework from the source code. Version MetalPerformanceShaders-100 Thu Feb 8 2018 MPSImageSobel(3)