ZenerA: Reference [Just Noticeable Differences]

JND's

Just Noticeable Difference

JND's are differences in sensory input that, under standardized conditions, are noticeable half of the time. The reason a statistical measure is utilized is because of the variability in human perception of sensory inputs. A stable, or concrete, numerical value can not be accurately determined. Generally speaking a JND of 4 or less is undetectable in video applications. For sound applications a JND of is approximately equal to 1 Decibel.

JND measurement has been developed for commercial use by Sarnoff corporation. They are included in a number of industry picture quality analysis tools.

JND Vision at Sarnoff

Tektronix Picture Quality Testing

Sound at Georgia State University Physics and Astronomy HyperPhysics.

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