Changes between Initial Version and Version 1 of SanJoséSubjectiveViewing

Timestamp:

Jan 27, 2012, 8:24:02 PM (14 years ago)

Author:

davidf

Comment:

--

SanJoséSubjectiveViewing

@@ +1 @@
+= Subjective Viewing =
+
+== Preparing material for subjective viewing ==
+
+=== Video data ===
+Please provide a directory per proposal or reference containing:
+ - decoded 8bit yuv files, using the naming convention of the original material on
+   the uni-hannover ftp site.  Eg, "BQMall_832x480_60.yuv".
+   [[BR]]
+   This will allow scripts to automatically determine the display parameters.
+
+ - if the same sequence at multiple QPs is to be tested, place video files in
+   directories called qpNN.
+
+ - this data should be copied to {{{Z:\XXX\SomeUsefulIdentifierEgCE11}}} on the playout computer.
+
+ - please avoid using spaces in file or directory names.
+
+For example, assuming two proposals, "REF" and "DUT" we should see the following:
+{{{
+$ ls -R REF/
+REF/qp22/BQMall_832x480_60.yuv
+REF/qp22/ParkScene_1920x1080_24.yuv
+...
+REF/qp27/BQMall_832x480_60.yuv
+REF/qp27/ParkScene_1920x1080_24.yuv
+...
+
+$ ls -R DUT/
+DUT/qp22/BQMall_832x480_60.yuv
+DUT/qp22/ParkScene_1920x1080_24.yuv
+...
+DUT/qp27/BQMall_832x480_60.yuv
+DUT/qp27/ParkScene_1920x1080_24.yuv
+...
+}}}
+
+=== Preparing a playlist ===
+We have a script that will create a playlist in the correct form to do a randomized
+A-B-A-B viewing.  It requires an input file to list the sequences that are of interest
+and the order in which to evaluate them:
+
+ 1. Create a textfile that names the order you wish to view the test points.  Eg,
+{{{
+$ cat order.txt
+qp22/BQMall_832x480_60.yuv
+qp27/BQMall_832x480_60.yuv
+...
+qp22/ParkScene_1920x1080_24.yuv
+qp27/ParkScene_1920x1080_24.yuv
+...
+}}}
+    Note the lack of any "DUT" or "REF" prefix.
+ 1. Run [[http://ftp.kw.bbc.co.uk/davidf/jctvc/gen-playlist-shuffled.pl|gen-playlist-shuffled.pl]] to generate a playlist:
+    [[BR]]
+{{{
+$ gen-playlist-shuffled.pl /path/to/REF /path/to/DUT order.txt > out.plst
+}}}
+    NB, the path given to REF and DUT should be fully qualified.
+ 1. For a subjective test with multiple viewing sessions, it is advisable to generate
+    multiple copies of the playlist, one for each viewing session.  Each viewing session
+    is then randomized differently.
+    [[BR]]
+    For example,
+{{{
+$ for N in 1 2 3 4 5 6; do
+     gen-playlist-shuffled.pl /path/to/REF /path/to/DUT order.txt > session$N.plst
+  done
+}}}
+
+=== Running the test ===
+Launch the [[http://ftp.kw.bbc.co.uk/davidf/videoplayer/|videoplayer]] using:
+{{{
+$ /path/to/videoplayer --vt.readahead=128 --vdu-fps=60 --quit --full --osdstate=2 $ANYOPTIONS_IVE_MISSED out.plst
+}}}
+
+The player will quit automatically when it reaches the end of the playlist.
+
+//DF: this could be made simpler if we create a small script and associate the .plst
+file extension with it.  Then people only have to double click on the correct playlist//
+
+== Notes on test configuration ==
+ - The [[http://ftp.kw.bbc.co.uk/davidf/jctvc/gen-playlist-shuffled.pl|gen-playlist-shuffled.pl]] script
+   will produce an A-B-A-B stimulus, with A and B randomized for each test point.
+   [[BR]]
+   eg, for BQMall @ qp22, it might be REF-DUT-REF-DUT, but for qp27 it might be DUT-REF-DUT-REF.
+
+ - If the test involves multiple proposals, an A-B-C-D-E-..Z-A-B-C-D-E-..Z stimulus can be generated
+   by providing multiple directories.  The stimulus order for each test point is randomized.
+   Eg, {{{ gen-playlist-shuffled.pl REF DUT1 DUT2 DUT3 DUT4 order.txt }}}
+   [[BR]]
+   //DF: this seems kind of pointless, surely it should be A-A-B-B-C-C-D-D-E-E-...Z-Z, which is what we've done before//
+
+== Notes on black & white level ==
+By default, the videoplayer outputs R'G'B' at 16-235, however on a
+computer monitor, this will look wrong.  The following options will set
+the output range to 0-255: {{{ --out-black=0 --out-range=256 }}}
+
+Alternatively, one can interactively toggle between the two to see the
+difference by using the 'n' and 'b' keys.
+
+//DF: what range has the monitor been configured for?