2D Convolution example

Very clear example of a 2D convolution:

http://www.songho.ca/dsp/convolution/convolution2d_example.html


This kind of convolution can be used, for example, to implement and edge detector applying a Sobel operator.

Enjoy!!!

Books I´ve read this year so far

• The Bourne Identity. Thrilling action packed book, you´ll definitely learn two English words, kerb and quay. 7 out of 10
  
• The constant gardener. Moving, enigmatic diplomatic atmosphere. It falls a little bit by the middle section, but has an amazing end that leave a great taste. 8 out of 10.
  
• The pillars of the earth. This is my favorite book ever. I've read it twice in Spanish and twice in English. The last time I read it was between 2008 and 2009. 10 out of 10.
  
• Misery. This is my second favourite book ever. How many times I have dreaded Ms Wilkes!!!! 9.5 out of 10.
  
• Hannibal Rising. The surprise of the year. The prose is quite unusual and for a non native English speaker (and reader) it causes some confusion at the beginning of the book. Once you get used to it, the is not a single dull moment in this book. I love Hannibal's character. 9 out of 10.
  
• Alice´s adventures in wonderland. I began reading this book today. So far I've read 20 of about 280 pages, and I´m absolutely delighted. The English used in the book is very very very easy to read, so I recommend this book for those of you learning English. So far 9 out of 10. [Edit: 21/07/2009] I have finished this book and my overall impression has gone a little bit down, I'm going to give it a 7. The story turns out to be very simplistic, and I can'f find the symbolism and the metaphores anywhere. However it's an excellent book for english students, since the language is very very simple.
  
• A brief history of time. Just one sentence, do not read it if you don´t have a scientific background. I have a background in both chemical engineering, and computer science, thus my knowledge of maths and physics can be considered more than average, and the book became almost impossible to follow once it "falls" into black holes. However is really enjoyable while can be understood.

I addition my parent´s gave me as a birthday present, a wonderful Sony PRS-505, this is an ebook reader, so I´m reading more than ever. I transfer to it every interesting article that I find on the net. With a good piece of software called calibre I can convert many formats to PRS's native format, and even download online newspapers automatically. Besides you can access more than 500.000 free books through google or Project Gutenberg.

Enjoy reading!!!!!