if you are looking for basics of image processing then it may not satisfy. But if research or some project in image processing is concerned then it should be bought. it is low price edition hence images in examples are not clear(look like photocopy) and black & white.
This book is for the advanced image processing users. You may have to go through other introductory books in order to get familiar with this book. However once you are acquainted with the basics of image processing, you can go ahead with this book. Highly recommended for master/phd students..