Coding Of Non-Rectangular Signals With Block-Based Transforms

Proceedings - International Conference on Image Processing, vol. 33, pp. 1152–1156

Abstract

This paper presents a transform coding technique for non-rectangular 2-D signals by extending the signal into a rectangular block in order to enable conventional block-based transform coding. The technique could be suitable for coding residuals of prediction blocks using geometric partitioning which has been adopted into the draft Versatile Video Coding standard. The extension of the non-rectangular signal is found using a sparse solution set generated by applying Orthogonal Matching Pursuits using partitioned transform bases. The method developed in this paper is based on Discrete Cosine Transform. Results achieved in an experimental setup outside of the video coding loop are presented for signals of triangular and trapezoidal shape in comparison to the shape-adaptive DCT. Encouraging gains are observed specifically for larger block sizes and in dependency of the quantization parameter and the partitioning shape.

Authors 3

1. Priyanka Das Aachen Lehrstuhl für Bildverarbeitung

   RWTH Aachen University

   Affiliation as printed

   Lehrstuhl für Bildverarbeitung, RWTH Aachen University

2. Nicolas Horst Aachen Lehrstuhl für Bildverarbeitung

   RWTH Aachen University

   Affiliation as printed

   Lehrstuhl für Bildverarbeitung, RWTH Aachen University

3. Mathias Wien Aachen Lehrstuhl für Bildverarbeitung

   RWTH Aachen University

   Affiliation as printed

   Lehrstuhl für Bildverarbeitung, RWTH Aachen University