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| A STUDY ON THE PERCEPTUAL ENTROPY OF IMAGES USING WAVELET TRANSFORM |
| Yuan Jiehui; Wei Zhenggang; Cai Yuanlong |
| Image Processing Center Xi 'an Jiaotong University Xi' an 710049 |
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Abstract In this paper,perceptual error threhhold (PET) functions in different wavelet subbands are obtained through subjective tests on artificial patterns，A new and generic two stage coding scheme is thus proposed,based on the nonuniform zero-trees of wavelet coefficients and the visually nonuniform quantization of small coefficients in higher subbands.Researches have been done for the visual transparent and nearly transparent cases,in comparisons with JPEG standard.Experimental results showed the feasibility and robustness of the scheme,Transparent quality can be obtained around 10 compression ratios for natural images.
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Received: 02 July 1997
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2000, Vol. 22 
