mpsimagesobel(3) [mojave man page]
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)
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MPSImageMedian(3) MetalPerformanceShaders.framework MPSImageMedian(3) NAME
MPSImageMedian SYNOPSIS
#import <MPSImageMedian.h> Inherits MPSUnaryImageKernel. Instance Methods (nonnull instancetype) - initWithDevice:kernelDiameter: (nullable instancetype) - initWithCoder:device: (nonnull instancetype) - initWithDevice: Class Methods (NSUInteger) + maxKernelDiameter (NSUInteger) + minKernelDiameter Properties NSUInteger kernelDiameter Additional Inherited Members Detailed Description MPSImageMedian.h MetalPerformanceShaders.framework Copyright: Copyright (c) 2015 Apple Inc. All rights reserved. MetalPerformanceShaders median filters The MPSImageMedian applies a median filter to an image. A median filter finds the median color value for each channel within a kernelDiameter x kernelDiameter window surrounding the pixel of interest. It is a common means of noise reduction and also as a smoothing filter with edge preserving qualities. NOTE: The MPSImageMedian filter currently only supports images with <= 8 bits/channel. 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(NSUInteger) kernelDiameter Initialize a filter for a particular kernel size and device Parameters: device The device the filter will run on kernelDiameter Diameter of the median filter. Must be an odd number. Returns: A valid object or nil, if failure. + (NSUInteger) maxKernelDiameter The maximum diameter in pixels of the filter window supported by the median filter. + (NSUInteger) minKernelDiameter The minimum diameter in pixels of the filter window supported by the median filter. Property Documentation - kernelDiameter [read], [nonatomic], [assign] The diameter in pixels of the filter window. The median filter is applied to a kernelDiameter x kernelDiameter window of pixels centered on the corresponding source pixel for each destination pixel. The kernel diameter must be an odd number. Author Generated automatically by Doxygen for MetalPerformanceShaders.framework from the source code. Version MetalPerformanceShaders-100 Thu Feb 8 2018 MPSImageMedian(3)