In the paper an improved Context-Based Adaptive Linear Prediction (CoBALP_ultra) losslessimagecoding algorithm is presented. Three principal and few auxiliary contexts are defined. CoBALP stage is followed by two-st...
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ISBN:
(纸本)9781479970094
In the paper an improved Context-Based Adaptive Linear Prediction (CoBALP_ultra) losslessimagecoding algorithm is presented. Three principal and few auxiliary contexts are defined. CoBALP stage is followed by two-step NLMS predictor, then cumulated predictor error is calculated on the basis of a new formula. It is shown experimentally that indeed, the new technique is time-effective while it outperforms the well known methods having reasonable time complexity, and is inferior only to extremely computationally complex ones.
While JPEG 2000 adopts the integer wavelet transform to attain "lossless" coding of images, the DCT based "lossy" coding still prevails in various fields of video communication technologies. This p...
详细信息
ISBN:
(纸本)0780385608
While JPEG 2000 adopts the integer wavelet transform to attain "lossless" coding of images, the DCT based "lossy" coding still prevails in various fields of video communication technologies. This paper investigates the integer DCT that can implement "lossless" coding of images maintaining compatibility to the "lossy" DCT coding. So far we have assigned optimum word length to each of multipliers in the integer DCT assuming colored spectrum of input image signal. However it is remained unknown that A) Is the assigned word length robust to change of input signal's characteristics? B) Does it depend on structure of the transform? This report is intended as an investigation of theoretical analysis to answer these questions.
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