Efficient HEVC intra-frame prediction using curved angular modes

R. Fernandes*, G. Sanchez, R. Cataldo, T. Webber, C. Marcon

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


Blending curved and straight lines on angular modes are proposed for intra-frame prediction in high-efficiency video coding (HEVC). All 33 angular modes in HEVC have received an offset-based displacement calculation to each predicted sample, so that the resulting prediction block models image regions with curved textures. The proposal includes a negligible overhead in the syntax elements of the encoded bitstream (up to 2.56%) to transmit the curvature parameter along with the angular mode of a predicted block. Results demonstrate increased prediction accuracy and consequent reduction in residuals. There is a fair trade-off between prediction accuracy and computational complexity even considering few curvature parameters. Further evaluations show an average reduction in Bjøntegaard delta rate of 3.19% for the HEVC test sequences.

Original languageEnglish
Pages (from-to)1214-1216
Number of pages3
JournalElectronics Letters
Issue number21
Publication statusPublished - 1 Oct 2018


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