ios - How to auto detect the edges of any object from an image? -

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i want auto detect edges of object in image,enter image description here have captured using camera or uploaded gallery. detected edges selected cropping tool can manually adjust well.

there existing application exact same thing (with 60-70% accuracy) not sure how it?

https://itunes.apple.com/in/app/tiny-scanner-pdf-scanner-to/id595563753?mt=8


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