Parametrization of Discrete Finite Biorthogonal Wavelets with Linear Phase
ICASSP '97 Proceedings of the 1997 IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP '97)-Volume 3 - Volume 3
A new class of two-channel biorthogonal filter banks and waveletbases
IEEE Transactions on Signal Processing
Wavelet filter evaluation for image compression
IEEE Transactions on Image Processing
Parameterized biorthogonal wavelet lifting for lightweight JPEG 2000 transparent encryption
MM&Sec '05 Proceedings of the 7th workshop on Multimedia and security
A symbolic transform attack on lightweight encryption based on wavelet filter parameterization
MM&Sec '06 Proceedings of the 8th workshop on Multimedia and security
Lightweight protection of visual data using high-dimensional wavelet parametrization
ICIAP'05 Proceedings of the 13th international conference on Image Analysis and Processing
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Selective encryption is used to encrypt parts of a bitstream, in our case images which are compressed by a wavelet based method. One approach is to keep the filter secret which is used for the transformation. Parameterised wavelet filters can be used to generate a large keyspace, however, in the case of orthogonal filters obtained by a variant of Pollen's factorisation it turns out that different parameters yield filters with very different quality and in particular worse quality as compared to the standard biorthogonal filters usually used for compression. To eventually overcome these limitations, we consider parametrisations of biorthogonal filters in this work. We discuss methods to create such filters, and show their properties regarding compression and encryption.