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I'm searching for Computer Vision: A Modern Approach (2nd Edition) pdf?
Unless someone put a gun to your head, I suggest you forego Forsyth & Ponce. Making sense of it to learn computer vision will require much more effort than other texts (and much more than necessary). Better vision textbooks are those of Trucco & Verri, Shapiro, Prince, and Hartley & Visser. Another new intro CV text that's worth a look is Klette's "Concise Computer Vision".
Edit PDF: All You Need to Know
This has many examples and excellent exercises.