Academic Journals Database
Disseminating quality controlled scientific knowledge

IMAGE COMPRESSION BASED ON IWT, IWPT & DPCM-IWPT

ADD TO MY LIST
 
Author(s): SHILPA S. DHULAP | DR. SANJAY L. NALBALWAR

Journal: International Journal of Engineering Science and Technology
ISSN 0975-5462

Volume: 2;
Issue: 12;
Start page: 7413;
Date: 2010;
VIEW PDF   PDF DOWNLOAD PDF   Download PDF Original page

Keywords: Integer Wavelet Transform | Integer Wavelet packet Transform | lifting scheme | Huffman coding | Shannon entropy | Differential pulse code modulation Color Images.

ABSTRACT
In Image Compression, the researcher’s aim is to reduce the number of bits required to represent an image by removing the spatial and spectral redundancies. Recently wavelet packet has emerged as popular techniques for image compression. In this paper proposes a wavelet-based compression scheme that is able to operate in lossyas well as lossless mode. First we describe integer wavelet transform (IWT) and integer wavelet packet transform (IWPT) as an application of lifting scheme (LS).After analyzing and implementing results for IWT and IWPT , another method combining DPCM and IWPT is implemented using Huffman coding for grey scale images. Then we propose to implement the same for color images using Shannon source coding technique. We measure the level of compression by the compression ratio (CR) and compression factor (CF). Comparing with IWT and IWPT the DPCM-IWPT shows better performance in image compression.
Affiliate Program     

Tango Rapperswil
Tango Rapperswil