Quality (philosophy)

Algorithm

World Wide Web

Engineering

Philosophy

Reliability engineering

Image quality

Similarity (geometry)

Omnidirectional camera

Structural similarity

Telecommunications

Computer science

Antenna (radio)

Omnidirectional antenna

Projection (relational algebra)

Subjective video quality

Quality Score

Evaluation methods

Pattern recognition (psychology)

Index (typography)

Image (mathematics)

Epistemology

Operations management

Video quality

Artificial intelligence

Quality assessment

Metric (unit)

Computer vision

Objective quality assessment plays a crucial role in the evaluation and optimization processes of Virtual Reality (VR) technologies, for which state-of-the-art objective quality evaluation metrics for omnidirectional video, i.e., 360 degree video, are typically derived from traditional MSE (or PSNR). Here we propose an objective omnidirectional video quality assessment method based on structural similarity (SSIM) in the spherical domain. Adopting the relationship of the structural similarity between the 2-D plane and sphere, the interference brought by the projection between the two domains can be well handled in the assessment process. The performance of the proposed spherical structural similarity (S-SSIM) index is evaluated with a subjective omnidirectional video quality assessment database. As demonstrated in the experimental results, the proposed S-SSIM outperforms state-of-the-art objective quality assessment metrics in omnidirectional video quality assessment.

Spherical Structural Similarity Index for Objective Omnidirectional Video Quality Assessment