University of Bristol

Adaptive Resolution Intra Coding

Delivering high resolution video in restricted bandwidth scenarios can be challenging.  Part of the reason for this is the high bitrate requirement of the intra-coded Instantaneous Decoding Refresh (IDR) pictures featuring in all video coding standards. Frequent coding of IDR frames is essential for error resilience in order to prevent the occurrence of error propagation. However, as each one consumes a huge portion of the available bitrate, the quality of future coded frames is hindered by high levels of compression. This work looks at new adaptive resolution intra coding methods for improving the rate distortion performance of the video codec.


B. Hosking, D. Agrafiotis, and D. Bull, “Spatial resampling of IDR frames for low bitrate video coding with HEVC,” IS&T/SPIE Electronic Imaging, San Francisco, Feb 2015.

B. Hosking, D. Agrafiotis, D. Bull, and N. Easton, “AN ADAPTIVE RESOLUTION RATE CONTROL METHOD FOR INTRA CODING IN HEVC,” IEEE International Conference on Acoustics, Speech and Signal Processing, Shanghai, March 2016.




Effect of resampled coding of IDR frame to the quality of a reconstructed B frame in a Group of Pictures (similar bitrate): left resampled coded , middle original, right standard coded