Newsgroups: sci.image.processing
From: Steve@dstrip.demon.co.uk (Steve Rencontre)
Path: cantaloupe.srv.cs.cmu.edu!das-news2.harvard.edu!news2.near.net!news.mathworks.com!solaris.cc.vt.edu!news.duke.edu!news-feed-1.peachnet.edu!gatech!swrinde!cs.utexas.edu!news.sprintlink.net!pipex!peernews.demon.co.uk!dstrip.demon.co.uk!Steve
Subject: Re: Motion blur-free frame capture ?
References: <3k3m32$k0h@holodeck.iss.nus.sg> <aAiPlWc2WCQ3079yn@oslonett.no>
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Date: Thu, 16 Mar 1995 20:11:31 +0000
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In article: <aAiPlWc2WCQ3079yn@oslonett.no>  bjoernk@oslonett.no (Bjorn-Kare Nilssen) writes:
> 
> In article <3k3m32$k0h@holodeck.iss.nus.sg>,
> jitleng@iss.nus.sg (Jit Leng - PSA) wrote:
> > I have a question on how to obtain motion blur-free frames for moving
> > objects.
> > 
> > As most CCD has analog video that is interlaced, i.e., odd field and
> > even field, how is it possible to get a motion blur free full frame 
> > resolution image ?  Is it achievable by just using a normal CCD high shutter 
> > speed CCD camera to grab a frame or must I get a non-interlaced camera ?
> 
> I'm capturing images of cars passing by the camera at up to 90 km/h. I'm
> using Screen Machine II or Movie_Machine Pro from FAST, but I've found
> no way to capture both fields at the same time. If I do I get an image
> that's very flickery. It's not only blurred, but double.
> I have to capture as fast as possible, so I have to just use the single field.
> But, using FAST, you can get hardware interpolation of the missing lines
> in one field. It does a very good job at filling in the missing parts,
> but for my purpose it takes just a little too much time.
> I don't know if other cards can do this interpolation though?


A quick flick through the Sony CCD databook makes it very clear that in a standard 
video camera, the CCD chip itself is outputting interlaced fields, so there's 
absolutely no way of getting a full frame grab without blur.

Roll on the universal adoption of HDTV and consequent cheap non-interlaced cameras!

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Steve Rencontre               |  steve@dstrip.demon.co.uk (business) 
If it works, it's obsolete.   |  steveren@cix.compulink.co.uk (private)
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