Common skills
flattened the RGB images to monochrome (by taking the mean of each channel)
Morphological Transformations
It is to “restore” an image broken parts
- OpenCV - https://docs.opencv.org/4.x/d9/d61/tutorial_py_morphological_ops.html
- Blog post - https://pyimagesearch.com/2021/12/01/ocr-passports-with-opencv-and-tesseract/