2:1 Vertical Reduction
plugin for VirtualDub 1.2+
This filter reduces the size of each frame by 2:1 in the vertical direction only.
A 1x2 non-overlapping matix is used.
This filter can also be used to deinterlace.
It is MMX optimized.
This filter offers a slight advantage over the VirtualDub resize filters because it
does not perform any blurring.
Use this filter if you want to maintain absolute maximum sharpness.
It is very similar to the 2:1 reduction filter, except that it only works in the
vertical direction.
Installation
Download the 2:1 Vertical Reduction Filter to your hard disk,
and unzip the contents to your VirtualDub\plugins directory. Then run VirtualDub.
You will see a new filter named "2:1 vertical reduction" in the filter list.
There are no configuration options for this filter.
Typical Application
This filter can be used to make good quality VideoCDs by capturing at the 352x480
resolution (interlaced) and then using this filter to downsample to 352x240.
Any capture card that uses the Bt848/849 chips should be able to capture at the
352x480 resolution.
This filter provides basic deinterlacing and frame height reduction.
For better results, place the "smart deinterlace" filter immediately before this
filter.
Notes
The MMX optimizations will only be used if the frame width is an even number.
Non-MMX code will be used for odd frame widths (slower).
Author: Christopher P. LaRosa
Last Update: March 7, 2000
Software Version: 1.0