Half-Equirectangular Projection
The standard display projection format for VR180 content, mapping a 180° forward field of view onto a rectangular image with uniform pixel distribution. It exhibits good compatibility with video codecs such as HEVC/H.265 and achieves higher encoding efficiency compared to fisheye formats.
Timeline (last 90 days)
Half equirectangular projection (Half-ERP) covers only the forward 180° field of view and is one of the standard display formats for VR180 content.
At the same viewport quality, native fisheye encoding requires a higher bitrate than half equirectangular projection encoding across all 24 clips, with a median excess of approximately 38%.
Due to nonlinear radial projection, fisheye images accumulate a large number of redundant pixels at the image edges, causing encoding to require more bitrate, whereas half equirectangular projection has a more uniform pixel spatial distribution and better compatibility with HEVC block partitioning structures.
All Facts (3)
Half equirectangular projection (Half-ERP) covers only the forward 180° field of view and is one of the standard display formats for VR180 content.
50%UnverifiedAt the same viewport quality, native fisheye encoding requires a higher bitrate than half equirectangular projection encoding across all 24 clips, with a median excess of approximately 38%.
50%UnverifiedDue to nonlinear radial projection, fisheye images accumulate a large number of redundant pixels at the image edges, causing encoding to require more bitrate, whereas half equirectangular projection has a more uniform pixel spatial distribution and better compatibility with HEVC block partitioning structures.
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