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Image compression using SOFM using Wavelet

18 Oct 2005 (Updated 18 Oct 2005)

Code covered by the BSD License

SOFM algorithm is one of the Method for Image compression ...

File Information
Description	The main objective of this project is to implement the concept of wavelet based compression to gray scale images using SOFM.Wavelet Transform is a superior approach to other time frequency analysis tools because its time scale width of the window can be stretched to match the original signal especially for image analysis.By using SOFM technique,we have made an attempt in employing lossy technique i.e., Vector Quantisation to encode the sub bands formed by the application of wavelet Transform.We have also used a clustering property of self organizing Feature Map of Kohonen,an unsupervised training algorithm formulated by Kohonen.Sofm serves as a tool for selecting the best vectors as they are being trained and the codebooks are formed using the trained vectors.Instead of storing the grayscale image,we store only the codebook and their corresponding index values.This reduces the space required to store the image,hence the compression of the image is achieved.
Required Products	Wavelet Toolbox
MATLAB release	MATLAB 6.0 (R12)

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Everyone's Tags	compression, sofm algorithm implementation using wavelet
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Comments and Ratings (11)
26 Mar 2006	vidhya k
27 Mar 2006	mathi k
27 Mar 2006	jeorge paul
27 Mar 2006	shenus n
28 Mar 2006	Kareen nasar
28 Mar 2006	nishul ben
05 Oct 2006	jay johnson	excuse me.can i ask what are the codebook and block size?the value... tq
21 Mar 2007	CHANDRA SEKHAR	GOOD
25 Dec 2007	sai ram krishna	i studied all the concept its excellent..... i hav a very little knowledge on SOFM soo can i know where the concept of SOFM is used and what r the functions of the SOFM used..??
21 Mar 2008	tarik piere	hello
20 Apr 2009	hbu	I also have a very little knowledge on SOFM ,but i will study it hard.

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Tag Activity for this File
Tag	Applied By	Date/Time
compression	Aarathy M	22 Oct 2008 08:03:15
sofm algorithm implementation using wavelet	Aarathy M	22 Oct 2008 08:03:15

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