Improvement of Video Coding Performance Using Adaptive Interpolation Filter Without Filter Selection Information

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  • 画像処理・符号化とアプリケーション　　選択情報が不要な適応内挿フィルタを用いた動画像符号化の高性能化
  • 選択情報が不要な適応内挿フィルタを用いた動画像符号化の高性能化
  • センタク ジョウホウ ガ フヨウ ナ テキオウ ナイソウ フィルタ オ モチイタ ドウガゾウ フゴウカ ノ コウセイノウカ

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Abstract

We propose a method to improve performance of video coding using an adaptive interpolation filter technique. The adaptive interpolation technique was based on clustering using the k-means method and did not need filter selection information. To improve the performance of the clustering, we introduced autocorrelation coefficients of the pixel values and the directions of the motion vectors as the new features and the Mahalanobis distance as the distance scale in the k-means method. We also used vector quantization to reduce the number of interpolation filter coefficients. In the simulation, our proposed method was implemented in the MPEG-2 based video codec. The simulation results show that the proposed method can reduce the bit rate by up to nearly 7 % compared to conventional adaptive interpolation filter methods.

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