In a playground now, I have the following code
Code Block let context = CIContext() |
| let orginalImage = UIImage.init(named: imageArray[0]) |
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| let inputImage = CIImage.init(cgImage: (orginalImage?.cgImage)!) |
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| let contourRequest = VNDetectContoursRequest.init() |
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| contourRequest.detectDarkOnLight = true |
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| contourRequest.contrastAdjustment = 1.0 |
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| let areaOfIntrest = CGRect(x: 0, y: 0, width: 50, height: 50) |
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| let roi = VNNormalizedRectForImageRect(areaOfIntrest, 3264, 2448) |
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| contourRequest.regionOfInterest = roi |
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| let requestHandler = VNImageRequestHandler(cgImage: (orginalImage?.cgImage)!, options: [:]) |
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| do{ |
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| try requestHandler.perform([contourRequest]) |
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| }catch{ |
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| print("error in perform") |
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| } |
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| let observations = contourRequest.results?.first as! VNContoursObservation |
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| print(observations.contourCount) |
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| let imageContours = drawContours(contoursObservation: observations, sourceImage: (orginalImage?.cgImage)!) |
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| print(imageContours.size) |
But I still get contours that our outside of the Region of Interest. Which I would think would be a rectangle that his 50 x 50 and starts in the lower left corner. Am I misunderstanding how the region of interest works.
