1     Scope
 2     References
 3     Abbreviations and definitions
 4     Attributes of a Reference Impairment System for Video (RISV)
        4.1     An adjustable range of video impairment levels
        4.2     Potential applications for a RISV
 5     Impairments produced by the RISV
        5.1     Block distortion
        5.2     Blurring
        5.3     Edge busyness
        5.4     Noise
        5.5     Jerkiness
        5.6     Combination of impairments
 6     Conclusion
Appendix I
VIRIS, a specific implementation of a RISV
        I.1     Introduction
        I.2     Impairment simulation
                  I.2.1     Block distortion
                  I.2.2     Blurring
                  I.2.3     Edge busyness
                  I.2.4     Noise
                  I.2.5     Jerkiness
        I.3     Calculation of the Peak Signal-to-Noise Ratio (PSNR)
        I.4     VIRIS programme
        I.5     VIRIS subjective test plan
                  I.5.1     VIRIS picture sequences
                  I.5.2     VIRIS test conditions
                  I.5.3     VIRIS test method
                  I.5.4     VIRIS viewing conditions
                  I.5.5     VIRIS test procedures
                  I.5.6     VIRIS subjective test results
                               I.5.6.1     Data analysis
                               I.5.6.2     VIRIS results
        I.6     Edge busyness subjective test plan
                  I.6.1     Edge busyness picture sequences
                  I.6.2     VIRIS test conditions and test material preparation
                  I.6.3     Edge busyness subjective test method
                  I.6.4     Edge busyness subjective test procedures
                  I.6.5     Edge busyness subjective test results
        I.7     Conclusions