Packed Regions Information SEI Message

Specific regions of interest (ROIs) within a video are of greater interest than the remainder of the video for many use cases. The Packed Regions Information (PRI) Supplemental Enhancement Information (SEI) message enables packing of rectangular ROIs from an original picture into a smaller resolution picture for video coding, reducing pixel rate and bitrate. The SEI message signals metadata describing the size and position of the ROIs in the coded picture and in the original picture. Decoders may use the metadata to reconstruct target pictures at the original resolution from the decoded pictures containing the packed regions. The PRI SEI message is under consideration for potential inclusion in a future version of the Versatile Supplemental Enhanced Information (VSEI) standard. Experimental results are provided for use of the PRI SEI message with test conditions for machine analysis of coded video content, showing reductions in bitrate and pixel rate.