is there any way to detect shape contours in Swift without having to branch out to OpenCV?

Question

Obviously, we can use CoreImage to convert to gray, denoise and blur an image but then when it comes to Canny Edge Detection, contour detection and to draw a contour of a shape it seems that this is not possible just using swift features. Am I right or is there something that I am missing here?

Answer 1

In June 2020 Apple added a new Contour Detection feature to their Vision Framework in iOS 14. (currently in beta), so you can now use Swift (w/o OpenCV) in order to detect contours.

You can find more details in this documentation from Apple: https://developer.apple.com/documentation/vision/vndetectcontoursrequest

Also relevant is this WWDC2020 video: https://developer.apple.com/videos/play/wwdc2020/10673/