Android OpenCV Find Largest Square or Rectangle

Question

This might have been answered but I desperately need an answer for this. I want to find the largest square or rectangle in an image using OpenCV in Android. All of the solut

Answer 1

After canny

1- you need to reduce noises with gaussian blur and find all the contours

2- find and list all the contours' areas.

3- the largest contour will be nothing but the painting.

4- now use perpective transformation to transform your shape to a rectangle.

check sudoku solver examples to see the similar processing problem. (largest contour + perspective)