How can I rename an image file after a value to be read from a certain position?

Renaming the image file Bilddatei C:\Scan\Image.tif after the value recognised within the rectangle coordinates top-left x=200px, y=1000px and bottom-right x=800px, y=1200px can be achieved with:
ocrcon "C:\Scan\Image.tif" /rename /zone 200,1000,800,1200