Support fpr cropping images before using ocr

[Patrick Wegner]

This is kind of a personal request, but it may also be applicable to some others.
I request the possibility to crop a special area of the image (basically like I can do with openCV in python):

function cropImage (int startXpos, int startYpos, int cropWidth, int cropHeight) => Cropped Image

This way I would be able to use OCR on specific parts of an image