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A 'must know' for the programmer, this famous site is a source of inspiration, thoughts, knowledge for most of us! (Programmers...)
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Huge quality contents updated on a daily basis and supported by
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Very useful website devoted to OpenGL and DirectX, 3D programming in general, with fully commented code samples.
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Angelcode, a good friend's site, with lots of dev resources and also cool projects.
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.:: Latest news ::.
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 huffman decoding - 23rd January 2007, 09:52
Huffman algorithm for lossless compression is widely used in modern video, image and audio encoding standards such as mp3, aac, jpeg, mpeg2, mpeg4 etc... Once the huffman tree is built the encoding process is very simple. Each word which needs to be encoded is looked up in the huffman tables and it's encoded translation is output in the bitstream. The process on the decoder's side is much more complex because it doesn't know in advance, in the bitstream, the seperation between the different encoded words.
The huffman algorithm guarantees that an encoded word never starts be another valid encoded word (a bit like phone numbers : what if someone else had the first part of your phone number as a phone number, nobody could ever reach you...). In short, the easiest way through for the decoder is to read one bit at a time and check in the huffman tables if the encoded word is found. Of course this process can be slighly accelerated by sorting the huffman tables by code length but it remains very slow.
In fact the most widespread technique for huffman decoding uses lookup tables. A huffman encoded word can be decoded in only one lookup (sometimes two if necessary). The technique is slighly tricky because it requires to create 'different' tables based on the classic huffman tree but in most cases it's really worth it. I found this page which explains it all : Practical Huffman Coding | > Comments (0)
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Author
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| matlab program | haythembehi | 7th May, 13:47 | | image processing | preeti | 6th May, 11:19 | | G.728 matlab code | sah22 | 6th May, 06:23 | | face detection by neural network | vidu_tedy | 2nd May, 05:41 | | face recognition | Manju4o2 | 1st May, 13:42 | | face recognition | Manju4o2 | 1st May, 13:41 | | face recognition | coder | 1st May, 13:18 | | image processing | pswatip | 30th Apr, 23:58 | | Matlab Code for Near Duplicate Video Detection | pswatip | 30th Apr, 23:53 | | Matlab code of Pan Tompkins algorithm for QRS detection | mmhn97 | 30th Apr, 13:26 |
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