Display Test Module for TrueTest™ Software

TrueTest™ Add-on

Software module with tests for evaluating display mura correlated to human visual perception

The Radiant Vision Systems TrueMURA™ software module is the first commercial system available to provide advanced image analysis algorithms for computing JND (“Just Noticeable Differences”) in displays. These tests augment the defect analysis functions already available in Radiant’s TrueTest™ Automated Visual Inspection Software, including a complete test suite for luminance, chromaticity, and defect detection. The JND detection algorithm incorporated in TrueMURA™ is based on U. S. patent 7,783,130, “Standard Spatial Observer” technology, licensed by Radiant Vision Systems from the National Aeronautics and Space Administration (NASA).

Automating human judgment of display defects or blemishes (referred to as “mura”) is difficult because human visual recognition of uniformity variations and other defects is dependent on many factors including brightness, color, and spatial relationships. To accurately discriminate JND—artifacts just noticeable by a human observer—TrueMURA is based on a model of human perception which allows grading of display mura in a way designed to match a human observer’s perception of defect severity. These algorithms ignore mura that cannot be seen by humans and rank the different varieties of mura that are distinguished by humans into categories matching those assigned by human observers.



  • Display mura characterization
  • Technology evaluationfor mura detection, categorization, and grading
  • Production quality control
  • General defect detection
  • Testing to German Automotive
  • Black Mura Standard as
  • described by the German Flat
  • Panel Display Forum (DFF)


  • Correlated to human visual perception of light and color
  • Reduces cost and variability in display image quality assessment
  • Objective, numerical evaluation of display mura based on JND

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