Is there a working example for the new MPSImageCanny (and MPSImageEDLines) functionality ?
I tried several ways (e.g. different texture sized, parameter) all leading to various errors like total freeze of my MBP under BigSur and Xcode 12.3
// Allocating sufficient space to store or data
let pointerToFloats = UnsafeMutablePointer<Float>.allocate(capacity: luminanceWeights.count)
pointerToFloats.assign(from: luminanceWeights, count: luminanceWeights.count)
let canny = MPSImageCanny(device: self.metalDevice!, linearToGrayScaleTransform: luminanceWeights, sigma: 3)
canny.useFastMode = false
canny.highThreshold = 0.8
canny.lowThreshold = 0.2
Is there any code snippet proven working I could base my work on ?
ChristianVirtual
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution
Last seen
User for
Post
Replies
Boosts
Views
Activity
I try to use MPSImageErode and MPSImageDilate in an app right now with SwiftUI and BigSur, Xcode 12.3
The code
				 var erodedilateKernelValues:[Float] = [ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0,
																								 0.0, 0.2, 0.2, 0.2, 0.2, 0.2, 0.2, 0.2, 0.0,
																								 0.0, 0.2, 0.1, 0.1, 0.1, 0.1, 0.1, 0.2, 0.0,
																								 0.0, 0.2, 0.1, 0.0, 0.0, 0.0, 0.1, 0.2, 0.0,
																								 0.0, 0.2, 0.1, 0.0, 0.0, 0.0, 0.1, 0.2, 0.0,
																								 0.0, 0.2, 0.0, 0.0, 0.0, 0.0, 0.1, 0.2, 0.0,
																								 0.0, 0.2, 0.1, 0.1, 0.1, 0.1, 0.1, 0.2, 0.0,
																								 0.0, 0.2, 0.2, 0.2, 0.2, 0.2, 0.2, 0.2, 0.0,
																								 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
				 let dilateShader = MPSImageDilate(
						device: self.metalDevice!,
						kernelWidth:edSize,
						 kernelHeight:edSize,
						 values:&erodedilateKernelValues)
				 dilateShader.encode(commandBuffer: cmdBuf,
													sourceTexture: wipTexture!,
													destinationTexture: erodila)
				 let erodeShader = MPSImageErode(
						device: self.metalDevice!,
						kernelWidth:edSize,
						kernelHeight:edSize,
						values:&erodedilateKernelValues)
				
				 erodeShader.encode(commandBuffer: cmdBuf,
													sourceTexture: erodila,
													destinationTexture: erodila2)
				 cmdBuf.commit()
				 cmdBuf.waitUntilCompleted()
				 wipTexture = erodila2
Resulting in
		Compiler encountered an internal error: (null)
'
/AppleInternal/BuildRoot/Library/Caches/com.apple.xbs/Sources/MetalPerformanceShaders/MetalPerformanceShaders-124.2.1/MPSCore/Utility/MPSLibrary.mm:338: failed assertion `MPSKernel MTLComputePipelineStateCache unable to load function DilateFilter4.
		Compiler encountered an internal error: (null)
'
/AppleInternal/BuildRoot/Library/Caches/com.apple.xbs/Sources/MetalPerformanceShaders/MetalPerformanceShaders-124.2.1/MPSCore/Utility/MPSLibrary.mm:338: failed assertion `MPSKernel MTLComputePipelineStateCache unable to load function DilateFilter4.
		Compiler encountered an internal error: (null)
'
when I use the filter with only Zero it actually works
				 var erodedilateKernelValues = [Float].init(repeating: 0.0, count: edSize * edSize)
But I want to try different filter values to see if I can improve the analytics on an image.
Any suggestions ?