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I figured it out: apparently the result is always the same - VNRectangleObservation. But underlying VNDetectedObjectObservation contains globalSegmentationMask. So:
let request = VNDetectDocumentSegmentationRequest { (request, error) in
guard let results = request.results as? [VNRectangleObservation],
let result = results.first else {
// No results
return
}
guard let segmentationMask = result.globalSegmentationMask, // VNPixelBufferObservation
let pixelBuffer = segmentationMask.pixelBuffer else {
// Mask is unusable
return
}
// And then for example:
let ciImage = CIImage(cvPixelBuffer: pixelBuffer)
}