WQbZS: Wavelet Quantization by Z-Scores for JPEG2000

Non-uniform Quantization of Detail Components in Wavelet Transformed Image for Lossy JPEG2000 Compression

The paper introduces the idea of non-uniform quantization in the detail components of wavelet transformed image. It argues that most of the coefficients of horizontal, vertical and diagonal components lie near to zeros and the coefficients representing large differences are few at the extreme ends of histogram. Therefore, this paper advocates need for variable step size quantization scheme whic...

Perceptual Criteria on JPEG2000 Quantization

The aim of this work is to explain how the Brightness Induction Wavelet Model used as a perceptual quantizer can be useful for improving a lossy compression and to introduce preliminary results. In fact, this approach consists in quantizing wavelet transform coefficients using the human visual system behavior properties. When compressing images, noise is fatal to compression performance, it can...

Contribution of CIWaM in JPEG2000 Quantization for Color Images

The aim of this work is to explain how to apply perceptual concepts to define a perceptual pre-quantizer and to improve JPEG2000 compressor. The approach consists in quantizing wavelet transform coefficients using some of the human visual system behavior properties. Noise is fatal to image compression performance, because it can be both annoying for the observer and consumes excessive bandwidth...

Quantization Watermarking in the JPEG2000 Coding Pipeline

JPEG2000 Wavelet Transform on StarCore-Based DSPs

1 Wavelet Transform .................................................2 1.1 Theory ..................................................................... 3 2 Implementation on StarCore-Based DSPs ..............7 2.1 Lifting ......................................................................8 2.2 Integer Lifting .......................................................10 2.3 StarCore Implementati...