This code is inspired from [4 Point OpenCV getPerspective Transform Example]
I have customized the code of Adrian to find 4 points of document or rectangle dynamically. Here i have added findLargestCountours and convert_object, where convert_object is our driver method which actually doing image processing and getting all 4 point rectangles from image. After getting all 4 point rectangle list findLargestCountours method finding largest countour in list.
Here are some examples.
| Original Image | Edge Detection | Warped Image |
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