Chaveamento Adaptativo Entre Métodos de Decisão para a Escolha da Primeira Direção de Processamento do Algoritmo EI-DCT

Abstract

The use of the EI - Extension Interpolation - padding technique in object-oriented block-based DCT has shown excellent results at low and medium bit rates. In recent works, two methods for selecting the first processing direction of the EI-DCT algorithm have been proposed. Both of them are based on the variances (one on the maximum and the other on the minimum) of object segments lengths. However, our experimental results have shown that the isolated use of any of these two methods is not able to outperform the other one in all situations. This paper presents an adaptive switching scheme which selects either one of these two decision strategies or a third one, which is based on the energy compaction of the transforms. Its coding performance is better than that obtained from the use of any of the isolated methods. The proposed switching strategy is based on a morphological feature. The paper also presents performance results of the proposed scheme for different methods of object partitioning into blocks.