book is best for beginners and those who want to learn the subject.
But JUST WILL CAUTION YOU THAT FLIPKART PRICES ARE VERY HIGH IN COMPARISON TO OTHER SITES.
dO REFER OTHER SITES BEFORE BUYING ANY BOOK .

This book introduces us to a great opensource library for implementing computer vision or image processing programs in C++. The author of this book Dr. Bradski himself is the person responsible for giving us the OpenCV library!

With prior knowledge of C/C++, one can easily use the OpenCV functions for implementing image processing and computer vision algorithms. I found this book very useful for getting acquianted to the OpenCV library.