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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 (1)> More news .:: Forum : Unanswered messages ::. Topic of the post Author Viewed Need help with Matlab GUI how to refresh/ redraw?NikTuz204facial expression evalution surveysorcimatt189automatic and robust image registration using feature points extraction and zernike moments invariantprakash180TDNN (Time Delay Neural Network) Matlabdecloop162CFP: ISNN2009 (May 26-29, 2009; Wuhan, China)WCCI149How to capture motion with magnetic sensor?hewstone999146ICA application in CDMA multiuser detectionblackhole81 .:: Forum : Most popular threads ::. Topic of the post Author Posts image processing393face recognition360Motion Detectionkhhem151Webcam programmingMirko105Looking for MATLAB source code for mp3 compressionLiu Ming ye69MATLAB code help please....jennifer22cute67Union & intersection of meshes49 .:: Forum : Latest Messages ::. Topic of the post Author Date Needed matlab code for image registration using FFT:rchan10th Oct, 08:46face recognitionnive10th Oct, 08:30face recognitionnive10th Oct, 08:27face recognitionlastontheline10th Oct, 06:51face recognitionryan9th Oct, 02:11ICA application in CDMA multiuser detectionblackhole8th Oct, 10:30Matlab source code for genetic algorithm based fuzzy controllerfadi6th Oct, 13:53MATLAB code help please....ensienne5th Oct, 11:14TDNN (Time Delay Neural Network) Matlabdecloop3rd Oct, 23:04Waveletdecloop3rd Oct, 22:53MATLAB code help please....decloop3rd Oct, 22:51How to capture motion with magnetic sensor?hewstone9992nd Oct, 16:17pitch shifting using matlabswap2you1st Oct, 18:39
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