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Add AccDirectionalNonMaximumSuppressionFilter
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AccImageFilter/AccDirectionalNonMaximumSuppressionFilter.metal
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| // | ||
| // AccDirectionalNonMaximumSuppressionFilter.metal | ||
| // MetalAcc | ||
| // | ||
| // Created by 王佳玮 on 16/4/5. | ||
| // Copyright © 2016年 JW. All rights reserved. | ||
| // | ||
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| #include <metal_stdlib> | ||
| using namespace metal; | ||
| kernel void DirectionalNonMaximumSuppression(texture2d<float, access::read> inTexture [[texture(0)]], | ||
| texture2d<float, access::write> outTexture [[texture(1)]], | ||
| device unsigned int *lowerThreshold [[buffer(0)]], | ||
| device unsigned int *upperThreshold [[buffer(1)]], | ||
| uint2 gid [[thread_position_in_grid]]) | ||
| { | ||
| float3 currentGradientAndDirection = inTexture.read(gid).rgb; | ||
| uint2 gradientDirection = uint2((currentGradientAndDirection.gb * 2.0) - 1.0); | ||
| float firstSampledGradientMagnitude = inTexture.read(gid + gradientDirection).r; | ||
| float secondSampledGradientMagnitude = inTexture.read(gid - gradientDirection).r; | ||
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| float multiplier = step(firstSampledGradientMagnitude, currentGradientAndDirection.r); | ||
| multiplier = multiplier * step(secondSampledGradientMagnitude, currentGradientAndDirection.r); | ||
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| float thresholdCompliance = smoothstep(*lowerThreshold, *upperThreshold, currentGradientAndDirection.r); | ||
| multiplier = multiplier * thresholdCompliance; | ||
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| float4 outColor = float4(multiplier, multiplier, multiplier, 1.0); | ||
| outTexture.write(outColor,gid); | ||
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| } | ||
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19 changes: 19 additions & 0 deletions
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AccImageFilter/AccDirectionalNonMaximumSuppressionFilter.swift
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| Original file line number | Diff line number | Diff line change |
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| // | ||
| // AccDirectionalNonMaximumSuppressionFilter.swift | ||
| // MetalAcc | ||
| // | ||
| // Created by 王佳玮 on 16/4/5. | ||
| // Copyright © 2016年 JW. All rights reserved. | ||
| // | ||
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| public class AccDirectionalNonMaximumSuppressionFilter: AccImageFilter { | ||
| public var threshold:(lower:Float,upper:Float)? | ||
| override public init(){ | ||
| super.init() | ||
| self.threshold = (0.1,0.5) | ||
| self.name = "DirectionalNonMaximumSuppression" | ||
| } | ||
| override public func applyFilter() { | ||
| addCommandWithFactor([threshold!.lower,threshold!.upper]) | ||
| } | ||
| } |
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