1 | initial version |
I am unfamiliar with this product, but it does look like Canny and also using contours. To get repeatable results an external lighting source (LEDs) should be used to light the paper, or just be in a well lite room. If the lighting is correct the filtering should only require thresholding, erodes and dilates. There also might be some calibration to help like a background subtraction removing any imperfections before starting.