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Appendix C: Functional Check
Impaired Sequence Test
After you have confirmed that the unimpaired video test is correct, use the
following procedure to test one or more of the impaired video sequences.
Measuring the impaired test sequence against the stored reference sequence
provides a check on the operation of the measurement algorithm with different
levels of impairment in the video material.
1. In the Generate Configuration menu, select one of the impaired video test
sequences (for example, Mobile3mbs+).
2. In the Capture Configuration menu, select the correct signal type (601-525 or
601-625).
3. Select the Mobile+ reference sequence. This reference matches the name in
the header ID for all the Mobile+ impaired video test sequences.
4. Click the Generate soft key to start generating the impaired test sequence.
5. Click the Capture soft key to start the capture operation.
6. Wait for the test sequence to be captured. The message “Capture sequence
saved” with the name, format, and file extension is displayed when the
capture is done. Note the time stamp of the sequence just saved for future
reference. If you have several sequences of the same name, only the time
stamp distinguishes one from another.
7. Click on the Measure soft key to start the measurement. The progress
indicator and the messages in the status bar show you what is happening.
Features that become unavailable during a measure are grayed out. When all
the measurements have completed, the Summary results are displayed.
8. Check the Summary results for the correct measurement values for the
captured impaired video test sequence against the values given either in
Table C--2 or in Table C--3, as appropriate. The values given in the tables
after the PQR and PSNR numbers are the detected parameter values. The
parameter values, especially the levels, are typical and can vary as the
algorithm is adjusted.
The PQR and PSNR values you measure should be very close to the values
given in the tables. If the PQR and PSNR values are correct, the measure
algorithms are verified.
9. If there is a significant difference between the measured PQR values or the
PSNR values for an impaired sequence and the values given in the table for
that sequence, recheck your configuration and redo the test. If the problem
persists, refer it to a qualified service person.
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PQA300 Picture Quality Analysis System User Manual