Adaptive lapped transform-based image and video coding

Timothy J. Klausutis; Vijay K. Madisetti

doi:10.1117/12.263199

10 January 1997 Adaptive lapped transform-based image and video coding

Timothy J. Klausutis, Vijay K. Madisetti

Proceedings Volume 3024, Visual Communications and Image Processing '97; (1997) https://doi.org/10.1117/12.263199
Event: Electronic Imaging '97, 1997, San Jose, CA, United States

Abstract

We propose a design framework for perfectly reconstructed time-varying linear-phase paraunitary filter bands using a novel adaptive lapped transform (ALT). The ALT is based on the Generalized Lapped Orthogonal Transform (GenLOT) proposed by Queiroz. A time-varying filter bank is constructed through the factorization of the GenLOT into cascaded matrix stages. Variable length lapped transforms are subsequently generated by cascading a number of these matrix stages to build specific length filters. Several constraints on the design ensure perfect reconstruction and a fast implementation. An embedded ALT images codec is presented and the application of the ALT to the H.263 video coding standard is discussed. Preliminary results show that the ALT-based embedded image codec has a 1.61-2.35 and a 2.37-4.04 dB increase in peak signal-to-noise ratios (PSNR) compared to the JPEG image coding standard for the Lenna and Barbara test images, respectively.

Citation Download Citation

Timothy J. Klausutis and Vijay K. Madisetti "Adaptive lapped transform-based image and video coding", Proc. SPIE 3024, Visual Communications and Image Processing '97, (10 January 1997); https://doi.org/10.1117/12.263199

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