Comparison of image quality for 360° images and videos that utilize different projections are difficult. This disclosure provides a reliable quality metric for 360° images/ videos, irrespective of the projection used. The 360° image for which the quality metric is to be computed is converted into a spherical representation. The surface of the sphere is peeled to produce overlapping loops that are rectangular in structure. A quality metric is determined by utilizing the block-based technique of SSIM to compute scores for blocks of the image and choosing a percentile based on the scores of the blocks of an image.
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Anonymous, "Projection Agnostic Quality Metric For 360° Images", Technical Disclosure Commons, (December 28, 2018)