将过滤器应用于特定的图像分割遮罩

Question

我需要从图像中获取Teeth SegmentationMatte，并为其添加一些过滤器，然后将其保存到新图像或原始图像中。

这是我当前的代码：

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {

    if let pickedImage = info[UIImagePickerController.InfoKey.originalImage] as? UIImage {
        pictureImageView.image = pickedImage
        picture = pickedImage

        if #available(iOS 13.0, *) {
            let base = CIImage(cgImage: picture.cgImage!)

            let maxcomp = CIFilter.maximumComponent()
            maxcomp.inputImage = base
            let makeup = maxcomp.outputImage

            guard let pictureCgImage = picture.cgImage else { return }

            let matte = CIImage(cgImage: pictureCgImage, options: [.auxiliarySemanticSegmentationTeethMatte : true,
            .auxiliarySemanticSegmentationSkinMatte : false,
            .auxiliarySemanticSegmentationHairMatte : false])

            let blend = CIFilter.blendWithMask()
            blend.backgroundImage = base
            blend.inputImage = makeup
            blend.maskImage = matte

            let result = blend.outputImage
            let context = CIContext()

            guard let filteredImage = result,
                let perceptualColorSpace = CGColorSpace(name: CGColorSpace.sRGB),
                let imageData = context.heifRepresentation(of: filteredImage, format: .RGBA8, colorSpace: perceptualColorSpace, options: [.semanticSegmentationTeethMatteImage: filteredImage]) else { return }

            let neededImage = CIImage(data: imageData) // our image with filtered teeth
        }
    }

    dismiss(animated: true, completion: nil)
}

因此，我希望原始图像的牙齿经过过滤。但是我得到的图像是在整个图片中添加了滤镜，而不仅仅是牙齿磨砂。