Filtered Intra Template Matching Prediction for Future Video Coding
Ramin G. Youvalari, Done Bugdayci Sansli, Pekka Astola, Jani Lainema · 2023
Intra template matching (intraTMP) is a block copy method for image coding which provides measurable gains for screen content. However, the tradeoff between the coding efficiency and complexity of this method for camera-captured content is less favorable compared to the screen content case. This paper proposes an enhanced intra template matching method which adapts the contents of a copied block to the local characteristics of the current block using an adaptive filter, to improve the performance of the tool for camera-captured content. Parameters of the adaptive filter are derived from the local neighborhood of the current block in both encoder and the decoder sides. Experiments illustrate that the proposed method provides 0.12% to 0.16% average luma coding gain over Enhanced Compression Model (ECM-7.0) exploration software under the common test conditions of the exploration study. Moreover, the proposed method improves the coding efficiency of the intraTMP tool in ECM-7.0 by around 50%.