How do you call of the digital image processing that simplifies an image by reducing the amount of pixels? I thought of the word “thinning”. But according to ”Fundamentals of Digital Image Processing” by Anil K. Jain, “Thinning algorithm transforms an object to a set of simple digital arcs, which lie roughly along their medial axes” while the processing I am searching a term has nothing to do with medial axes. Instead, it eliminates pixels in a consistent balance (e.g,.one pixel in every three pixels). Any suggestion/ insight will be much appreciated. Also, are “simple digital arcs” in the quote equivalent to edges? Thank you in advance.