Genista Corporation

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Genista Corporation was a company that used computational models of human visual and auditory systems to measure what human viewers see and hear. The company offered quality measurement technology that estimated the experienced quality that would be measured by a mean opinion score (MOS) resulting from subjective tests using actual human test subjects.

Digital video systems exploit properties of the human visual system to reduce the bit rate at which a video sequence is coded. Video quality assessment tools based on network quality metrics such as packet loss, MDI, and PSNR do not correlate well with a perceived visual quality due to the nonlinear behavior of the human visual system. As a result, accurate prediction of the perceived quality of the output video should also take the human visual system properties into account.

Genista Corporation's patented technology was the result of research done by Stefan Winkler in the field of vision models and metrics. Details on his work can be found in his book: Digital Video Quality, Stefan Winkler, Wiley, March 2005, ISBN 0-470-02404-6.

In June 2007, Genista became part of Symmetricom's QoE Assurance Division.

• Mean opinion score
• Video quality
• Digital video

This article includes a list of references, related reading, or external links, but its sources remain unclear because it lacks inline citations. Please help improve this article by introducing more precise citations. (February 2008) (Learn how and when to remove this message)

• Video quality evaluation for mobile streaming applications^{[permanent dead link]}
• Video quality evaluation for Internet streaming applications^{[permanent dead link]}
• Color image quality on the Internet^{[permanent dead link]}
• Visibility of noise in natural images^{[permanent dead link]}
• Audiovisual quality evaluation of low-bitrate video^{[permanent dead link]}
• Visual fidelity and perceived quality: toward comprehensive metrics^{[permanent dead link]}
• Apple QuickTime vs. Microsoft Windows Media: an objective comparison of video encoding quality^{[permanent dead link]}

• Winkler, Stefan, Digital Video Quality, Wiley, March 2005, ISBN 0-470-02404-6

• Genista Corporation - White Papers and Technical Articles on Video Quality Archived 2007-03-11 at the Wayback Machine
• ITU-R BT-series Recommendations on subjective video quality assessment
• Video Quality Experts Group