olemus
lähtepilt pilditöötluses
=
source image in image processing

näide
master image and cropped images
https://www.researchgate.net/publication/341851509/figure/fig4/AS:898182246584328@1591154743213/Master-image-and-cropped-images-A-Original-master-image-taken-by-EAGL-I-B-D-three.ppm