Improving block-based compensated wavelet lifting by reconstructing unconnected pixels

TL;DR

This paper introduces a novel reconstruction method for unconnected pixels in block-based compensated wavelet lifting, enhancing visual quality and reducing bit usage in lossless coding.

Contribution

It proposes an improved inversion technique for block-based motion compensation that reconstructs unconnected pixels, improving visual quality and coding efficiency.

Findings

Enhanced subjective visual quality

Up to 2.6% bit savings in lossless coding

Effective reconstruction of unconnected pixels

Abstract

This paper presents a new approach for improving the visual quality of the lowpass band of a compensated wavelet transform. A high quality of the lowpass band is very important as it can then be used as a downscaled version of the original signal. To adapt the transform to the signal, compensation methods can be implemented directly into the transform. We propose an improved inversion of the block-based motion compensation by processing unconnected pixels by a reconstruction method. We obtain a better subjective visual quality while furthermore saving up to 2.6% of bits for lossless coding.