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Why does DV not look very good on a computer screen?
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1) DV resolution is 720x576 (PAL) or 720x480 (NTSC). Most computer
desktops today use at least 1024x768. Do the math; if outputting
DV data pixel by pixel to a computer screen, it will not fill
the screen up unless you set the resolution on your desktop to
something lower.

2) DV uses ITU-R BT.601 sampling rate of 13.5 MHz. This gives you
pixels that are not square in proportions. Pixels on a computer
monitor, however, are usually square. To view DV video on a
square-pixel computer screen in a proper aspect ratio, you must
do some horizontal stretching (for PAL) or squeezing (for NTSC)
on the fly. This involves resampling the pixels in horizontal
direction by using some interpolation method.

3) The gamma value of DV images is different to that of computer
monitors. Moreover, DV uses a different range of "legal" colors.
The colors will seem washed-out on a computer screen if not
processed correctly on the fly when viewing.

4) The video frame rate won't usually match to the refresh rate on
your computer monitor. This can cause the movement to stutter.

5) Video signal is interlaced, i.e. it consists of fields instead
of frames. You do not usually use interlaced modes on a computer
screen, so you will see both fields at once (interlacing artifacts).
Interlacing also makes it difficult to resize the image in vertical
direction.

 

Last update: 02:19 PM Saturday, May 13, 2006

 



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