Progressive decoding method for fractal image compression l

Progressive decoding method for fractal image compression l l 1 Sourcs: IEE Proc. -Vis. Image Signal Process. , Vol. 151, No. 3, June 2004 Authurs: C. He, S. X. Yang and X. Huang Presented by: Shih-Chang Date: 4/21 2005

Outline l l l 2 Introduction Fractal image compression Decoding scheme Experimental results Conclusion

Introduction l 3 In particular, the existing decoding scheme is a special case of the proposed controllable decoding scheme when its control parameter is set as one.

fractal image compression (cont. ) 4

fractal image compression (cont. ) Ι 16 …………… … pattern 0° 1. 2 45 ° *8 8*8 16*16 256*256 … 5

fractal image compression (cont. ) compare Ri 8*8 1, 2, 0. 5 6 Index table

decoding scheme (cont. ) …… μ 0 1, 2, 0. 5 μ 1 …… lμn+1=T(μn) l. Exist 7 Index table μn

decoding scheme (cont. ) 1 -λ μ 0 1, 2, 0. 5 λ …… μ 1 …… lμn+1=(1 -λ) l. Propose 8 μn μn+ λT(μn), λ=(0, 1

decoding scheme (cont. ) exist Propose 9

Experimental results(cont. ) 10

Experimental results(cont. ) 11

Experimental results(cont. ) 12

Conclusion l l 13 The existing rigid decoding scheme, the proposed scheme provides a better choice for some applications that need progressive decompression. Increasing sequence {λn} with 0<λn ≦ 1 is used, instead of the constant parameterλ.