MPSImageAreaMin(3) MetalPerformanceShaders.framework MPSImageAreaMin(3)NAME
MPSImageAreaMin
SYNOPSIS
#import <MPSImageMorphology.h>
Inherits MPSImageAreaMax.
Additional Inherited Members
Detailed Description
The MPSImageAreaMin finds the minimum pixel value in a rectangular region centered around each pixel in the source image. If there are
multiple channels in the source image, each channel is processed independently. It has the same methods as MPSImageAreaMax The edgeMode
property is assumed to always be MPSImageEdgeModeClamp for this filter.
Author
Generated automatically by Doxygen for MetalPerformanceShaders.framework from the source code.
Version MetalPerformanceShaders-100 Thu Feb 8 2018 MPSImageAreaMin(3)
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MPSImageDilate(3) MetalPerformanceShaders.framework MPSImageDilate(3)NAME
MPSImageDilate
SYNOPSIS
#import <MPSImageMorphology.h>
Inherits MPSUnaryImageKernel.
Inherited by MPSImageErode.
Instance Methods
(nonnull instancetype) - initWithDevice:kernelWidth:kernelHeight:values:
(nonnull instancetype) - initWithDevice:
(nullable instancetype) - initWithCoder:device:
Properties
NSUInteger kernelHeight
NSUInteger kernelWidth
Additional Inherited Members
Detailed Description
The MPSImageDilate finds the maximum pixel value in a rectangular region centered around each pixel in the source image. It is like the
MPSImageAreaMax, except that the intensity at each position is calculated relative to a different value before determining which is the
maximum pixel value, allowing for shaped, non-rectangular morphological probes.
for each pixel in the filter window:
value = pixel[filterY][filterX] - filter[filterY*filter_width+filterX]
if( value > bestValue ){
result = value
bestValue = value;
}
A filter that contains all zeros and is identical to a MPSImageAreaMax filter. The center filter element is assumed to be 0 to avoid
causing a general darkening of the image.
The edgeMode property is assumed to always be MPSImageEdgeModeClamp for this filter.
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) kernelWidth(NSUInteger) kernelHeight(const float
*__nonnull) values
Init a object with kernel height, width and weight values. Each dilate shape probe defines a 3D surface of values. These are arranged in
order left to right, then top to bottom in a 1D array. (values[kernelWidth*y+x] = probe[y][x]) Values should be generally be in the range
[0,1] with the center pixel tending towards 0 and edges towards 1. However, any numerical value is allowed. Calculations are subject to the
usual floating-point rounding error.
Parameters:
device The device the filter will run on
kernelWidth The width of the kernel. Must be an odd number.
kernelHeight The height of the kernel. Must be an odd number.
values The set of values to use as the dilate probe. The values are copied into the filter. To avoid image ligthening or darkening, the
center value should be 0.0f.
Property Documentation
- kernelHeight [read], [nonatomic], [assign]
The height of the filter window. Must be an odd number.
- kernelWidth [read], [nonatomic], [assign]
The width of the filter window. Must be an odd number.
Author
Generated automatically by Doxygen for MetalPerformanceShaders.framework from the source code.
Version MetalPerformanceShaders-100 Thu Feb 8 2018 MPSImageDilate(3)