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Improvements to the JPEG-LS prediction scheme

Improvements to the JPEG-LS prediction scheme. Authors: S. Bedi, E. A. Edirisinghe, and G. Grecos Source : Image and Vision Computing. Vol. 22, No. 1, 2004, pp. 9-14 Speaker: Chia-Chun Wu ( 吳佳駿 ) Date : 2004/09/08. Outline. Introduction to JPEG-LS JPEG-LS prediction scheme

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Improvements to the JPEG-LS prediction scheme

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  1. Improvements to the JPEG-LS prediction scheme Authors:S. Bedi, E. A. Edirisinghe, and G. Grecos Source : Image and Vision Computing. Vol. 22, No. 1, 2004, pp. 9-14 Speaker:Chia-Chun Wu (吳佳駿) Date : 2004/09/08

  2. Outline • Introduction to JPEG-LS • JPEG-LS prediction scheme • Improvements JPEG-LS prediction scheme • Experimental results • Conclusions • Comments

  3. Determine predictive value for x with prediction scheme Compute difference = x - Encode using entropy coding e Introduction to JPEG-LS Pixel value xin original image

  4. JPEG-LS prediction scheme  JPEG-LS predictive template

  5. JPEG-LS prediction scheme Horizontal edge Vertical edge

  6. JPEG-LS prediction scheme Vertical edge Horizontal edge

  7. JPEG-LS prediction scheme

  8. Improvements JPEG-LS Diagonal edge T1=20, T2=0 Diagonal edge T1=20, T2=0

  9. Experimental results  Predictive mean squared error N = 9

  10. Experimental results Table 1 PMSE values and lossless compression ratios of all test images, when compressed using JPEG-LS

  11. Experimental results Fig. 1. Performance at T1 = 11

  12. Experimental results Fig. 2. Performance at T1 = 19

  13. Experimental results Fig. 3. Optimum performance graphs

  14. Experimental results Table 2 Optimum performance and settings for proposed algorithm

  15. Experimental results Fig. 4. Predictive error images (a) using JPEG-LS, (b) using proposed scheme

  16. Conclusions • It maintains the low complexity requirement of JPEG-LS standard. • The proposed a modifications reduce the PMSE up to 15%.

  17. Comments • 如何根據影像不同的特性，動態的去調整門檻值T1及T2？ • 是否可以利用統計分析的方法，去找出適用於一般影像的門檻值T1及T2？

  18. Sample images Lena Baboon

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