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no matching function for call findcontours

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Hello, I'm currently developing an application with openCV for IOS on Ipad. My work is based on the sample call 'Chapter13 : saving video' from 'Instant Opencv for iOS' book. I would like to process each frame from a video using the function findContours. Unfortunately, i have an error call 'No matching function for call to 'findContours'. That's seems really strange because Xcode allow me to auto-complete this function and i have no problem to use other functions like 'inRange' or 'cvtColor'. Also, i have the same error to draw a circle with the function 'circle'. I'm using opencv2.framework. below, my code and my error : ![image description](/upfiles/14388512743792957.png) Thanks for your help

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