Digital Image Processing Textbook with Specific Topics
A fundamental book on image processing for electrical engineers is


Two-Dimensional Signal and Image Proccesing_Jae S. Lim


A highly recommended one, again, for electrical engineers is


Fundamentals of Digital Image Processing_Anil Jain


A hands-on book on basic practical image procesing is


Principles of Digital Image Processing_Wilhelm Burger


If specifically looking for machine vision, then have a look at 


Bernd Jahne - Digital Image Processing.