access icon free Efficient HEVC intra-frame prediction using curved angular modes

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.

Inspec keywords: video coding; image texture; computational complexity; image sequences; data compression

Other keywords: curved angular modes; efficient HEVC intra-frame prediction; Bjøntegaard delta rate; straight lines; HEVC test sequences; curvature parameter; offset-based displacement calculation; prediction block models image regions; prediction accuracy; high-efficiency video coding; computational complexity; angular mode

Subjects: Image and video coding; Video signal processing

http://iet.metastore.ingenta.com/content/journals/10.1049/el.2018.6051
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content/journals/10.1049/el.2018.6051
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