[opendtv] Re: Image quality
- From: Tom Barry <trbarry@xxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Wed, 16 Nov 2005 22:18:36 -0500
> That certainly would be a limitation. I also appreciate the argument
> about the absence of zoom in the human eye (wouldn't that be
> convenient). perhaps the constraints on such sophisticated optics could
> be relaxed if, again, we only ask it to perform well for a very narrow
> angle around the centre of the lens.
I thought the human eyeball could constict a bit in diameter, making the
retina further from the lens. After also adjusting the lens that might
be a bit of zoom.
- Tom
Olivier Houot wrote:
>>Craig wrote:
>>Dr. Bill Glenn, at Florida Atlantic University built an HDTV camera
>>that did some of this. It could capture extra detail in the static
>>areas of the image, and less detail in the moving areas of the image.
>>But it did not work because of eye tracking, which allows us to focus
>>on a portion of the image to acquire high resolution detail. In the
>>real world the stimulus is always consistent across the field of
>>view. Our visual system decides over what portion of that field to
>>acquire a high resolution image.
>>
>>
>
>
> I was thinking of a much more stupid system where the field of view
> would be divided in a matrix of smaller views amenable to the reduced
> high resolution FOV of the simplified camera, and each element of the
> bigger picture would be scanned in a predictible sequence by the
> actuators. The processing to stich the views together would be nowhere
> as complicated as what the brain does.
>
> One full scanning would have to occur in 1/60 th of a second.
> Hopefully, that would be enough to keep some coherency between the
> elementary views in the face of motion. I don't see any easy way to
> freeze the picture in one piece like a shutter does, in order to scan it
> at leisure afterwards.
>
> That certainly would be a limitation. I also appreciate the argument
> about the absence of zoom in the human eye (wouldn't that be
> convenient). perhaps the constraints on such sophisticated optics could
> be relaxed if, again, we only ask it to perform well for a very narrow
> angle around the centre of the lens.
>
>
>
>
>
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