Question

I know there exist many many books about image processing but I need an advise for a particular good one giving practical hints for using the algorithms. I don't need background information about HOW an algorithm works, e.g. HoughTrafo or Canny Filter as I know that already from various books. But I need a good advise on how to use those filters efficiently and in particular on how to set the thresholds etc.

It currently gives me a huge headache on how to chose those values. When I set them to fixed values, they work for one picture and when changing the illumination slightly, the dont work anymore for various reasons. So I wonder on how to dynamically set them from image specific values. I read on SO to e.g. set the canny thresholds to:

low = 0.666*mean(img)
high = 1.333*mean(img)
(http://www.kerrywong.com/2009/05/07/canny-edge-detection-auto-thresholding/)

but somehow I havent had much success with it so far. I'm interested in good advises for books etc in particular but included the special example on how to determine thresholds for canny to make it a valid SO-question :-)

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Solution

If you want a practical book, typically the book will be targeted to a specific library.

Here you can find a list of most of the books about the OpenCV library.

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