Thank you for your replay. I'm a software engineer from china,China now have broad market prospect in Machine vision application and I am also work in this field. I am doing a survey on surface inspection recently, and want to make a surface inspection product. I download the visionappster and try it yesterday. I am glad to recommend it to my colleague.I think visionappster is similar to machine vision software like cognex or visionmaster,it aslo can publish algorithm from different community. Looking forward that visionappster.com will publish more algorithms and create sustainable value. best wishes to you.
Yes, you can certainly use getPerspectiveTransform and warpPerspective functions if you know where the wanted corners are in the input image (like the corners of the credit card in your example.) It will work using either C or Python API. It all boils down to the question on how you can find the four corner points for the transform.