Image embedded coding with edge preservation based on local variance analysis for mobile applications

Gaoyong Luo; David Osypiw

doi:10.1117/12.641704

10 February 2006 Image embedded coding with edge preservation based on local variance analysis for mobile applications

Gaoyong Luo, David Osypiw

Proceedings Volume 6074, Multimedia on Mobile Devices II; 607404 (2006) https://doi.org/10.1117/12.641704
Event: Electronic Imaging 2006, 2006, San Jose, California, United States

Abstract

Transmitting digital images via mobile device is often subject to bandwidth which are incompatible with high data rates. Embedded coding for progressive image transmission has recently gained popularity in image compression community. However, current progressive wavelet-based image coders tend to send information on the lowest-frequency wavelet coefficients first. At very low bit rates, images compressed are therefore dominated by low frequency information, where high frequency components belonging to edges are lost leading to blurring the signal features. This paper presents a new image coder employing edge preservation based on local variance analysis to improve the visual appearance and recognizability of compressed images. The analysis and compression is performed by dividing an image into blocks. Fast lifting wavelet transform is developed with the advantages of being computationally efficient and boundary effects minimized by changing wavelet shape for handling filtering near the boundaries. A modified SPIHT algorithm with more bits used to encode the wavelet coefficients and transmitting fewer bits in the sorting pass for performance improvement, is implemented to reduce the correlation of the coefficients at scalable bit rates. Local variance estimation and edge strength measurement can effectively determine the best bit allocation for each block to preserve the local features by assigning more bits for blocks containing more edges with higher variance and edge strength. Experimental results demonstrate that the method performs well both visually and in terms of MSE and PSNR. The proposed image coder provides a potential solution with parallel computation and less memory requirements for mobile applications.

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Gaoyong Luo and David Osypiw "Image embedded coding with edge preservation based on local variance analysis for mobile applications", Proc. SPIE 6074, Multimedia on Mobile Devices II, 607404 (10 February 2006); https://doi.org/10.1117/12.641704

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KEYWORDS

Image compression

Wavelets

Wavelet transforms

Image transmission

Digital imaging

Computer programming

Visualization

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