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NOTE: 2-3 pulldown is the same term as 3:2 pulldown, but this book<br />
uses the 2-3 notation to indicate that it’s a sequence, not a ratio, and<br />
that in practice two fields are usually created from the first film frame.<br />
What Is Edge Enhancement?<br />
When films are transferred to video in preparation for DVD encoding, they<br />
are commonly run through digital processes that attempt to clean up the<br />
picture. These processes include digital video noise reduction (DVNR) and<br />
image enhancement. Enhancement increases the contrast (similar to the<br />
effect of the sharpen or unsharp mask filters in Photoshop), but it can tend<br />
to overdo areas of transition between light and dark or different colors,<br />
causing a chiseled look or a ringing effect, such as the haloes you see<br />
around streetlights when driving in the rain.<br />
DVNR is a good thing, when done well, because it can remove<br />
scratches, spots, and other defects from the original film. Enhancement,<br />
which is rarely done well, is a bad thing. The video may look sharper and<br />
clearer to the casual observer, but fine tonal details of the original picture are<br />
altered and lost.<br />
Note that ringing can also be caused by the player and by the TV. Scan<br />
velocity modulation (SVM), for example, causes ringing.<br />
Does DVD Work with Barcodes?<br />
DVD Technical Details 111<br />
If your humble book author and other long-time developers of laserdiscs<br />
had prevailed, all DVD players would support barcodes. This would have<br />
made for really cool printed supplements and educational material that<br />
could jump to any part of a disc with a swipe of a barcode wand. But the<br />
rejection of our recommendations after an all-star meeting in August of<br />
1995 is another story for another day.<br />
So the answer is “mostly no.” A few industrial players, the Pioneer<br />
LD-V7200, Pioneer LD-V7400, and Philips ProDVD-170 support barcodes,<br />
including compatibility with the LaserBarCode standard. The DVD must be<br />
authored with one sequential PGC titles in order for the timecode search to<br />
work. More info can be found in the Pioneer technical manuals (www.<br />
pioneeraus.com.au/multimedia/manuals/op_manuals_index.htm).
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