Wavelet‐based adaptive vector quantization for still‐image coding

Chen, Wen-Shiung; Hsieh, Lili

doi:10.1002/ima.10024

Cited by 2 publications

(2 citation statements)

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“…4a and b. respectively. In order to measure the performance of the proposed AVQ algorithm, the existing AVQ algorithms namely ChenChung adaptive vector quantisation (CCAVQ) [30], history aid and locality-based updating (HA + UL) [29] and GTR [27] are experimented in the same computer system for various rate distortion parameters l. For the l value of 1, the CCAVQ algorithm gives a PSNR value of 44. 24 Table 3.…”

Section: Experiments and Resultsmentioning

confidence: 99%

“…The Gold-washing method for AVQ in spatial domain is reported in [26], wherein the source data are directly compressed without requiring the generation of codebook in separate pass. The same Gold-washing method in transformed domain using wavelet transform has been reported by Chen and Hsieh [27]. An AVQ algorithm to encode the nonstationary sources called generalised threshold replenishment (GTR) reported in [28] is an online algorithm that uses the rate-distortion cost criteria in both the determination of nearest-neighbour codewords and to update the dynamic codebook.…”

Section: Introductionmentioning

confidence: 89%

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An orthogonal polynomials transform-based variable block size adaptive vector quantisation for colour image coding

Krishnamoorthy

Punidha

2012

IET Image Processing

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In this paper, a new adaptive vector quantisation with variable block size based on orthogonal polynomials is proposed for colour image coding. The input colour image is partitioned into fixed larger block sizes and the homogeneity/complexity of the local region is tested with the mean-normalised variance classifier. The homogeneous regions are encoded with fixed larger blocks and the complex regions are further divided into smaller block sizes for encoding as it gives the wealth of low-level information such as the high detail and high number of contrast edges. The integer-based orthogonal polynomials transform is then applied on the variable block sizes utilising the inter-correlation property of individual colour planes and interactions among the colour planes so as to reduce the vector dimension and hence the less computational cost. The proposed technique generates two dynamic codebooks and two backup codebooks adaptively and use rate-distortion cost criteria to encode both the homogeneous and complex regions separately. Since the proposed method encodes all the three colour components in single pass, the colour image encoding time is slightly higher than that of grey scale image coding but in contrast to three times in the existing colour image coding techniques.

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Section: Experiments and Resultsmentioning

confidence: 99%