MPSImageThresholdBinaryInverse(3) MetalPerformanceShaders.framework MPSImageThresholdBinaryInverse(3)
NAME
MPSImageThresholdBinaryInverse
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
The MPSImageThresholdBinaryInverse 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 ThresholdBinaryInverse function is:
destinationPixelValue = sourcePixelValue > thresholdValue ? 0 : maximumValue
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 MPSImageThresholdBinaryInverse 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 MPSImageThresholdBinaryInverse(3)