RE: Scanline Smear...

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Gullen, Jim (Jim.Gullen++at++GSC.GTE.Com)
Thu, 19 Mar 1998 18:41:50 -0800

Here's a depiction of your problem using the images of the top, middle,
and bottom
scan lines as you describe them:

a) A video camera moving to the right misses pixels marked "x", images
pixels marked A,B,C
and sends them to a monitor. The y's represent "filler" to form a
rectangular CULL volume:
AAAAAAyyyy
xxBBBBBByy
xxxxCCCCCC

b) The monitor displays a "smeared" image:
AAAAAA
BBBBBB
CCCCCC

I think you can generate the "smeared" image by culling to a) and
shearing the DRAW
projection matrix to yield b).

> Jan Barglowski wrote:
> >
> > Performers:
> >
> > I have a task to create scanline smear, that is, imagine a video
> camera
> > panning so quickly that by the time the bottom scanline is imaged,
> the
> > camera's heading is not close to when the top scanline was imaged.
> I
> > am not interested in the scanline compression/expansion that also
> may
> > happen, just the effect between scanlines.
> >
>
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