Posted by Richard Crowley on 11/06/05 20:57

"Glenn" <glennleduc@comcast.net> wrote in message
news:v26rm11js8c70o6lg5blrgq7sr8hursh0t@4ax.com...
> On Sat, 5 Nov 2005 18:55:02 -0800, "Richard Crowley"
> <rcrowley@xpr7t.net> wrote:
>
>>"Glenn" wrote ...
>>> I'm Glenn LeDuc, I work for an agency that helps people who are
>>> blind
>>> and visually impaired find work here in Washington State. For the
>>> past
>>> year or so I've been working on a making low cost devices to magnify
>>> books and other texts and objects for people with low vision that
>>> utilizes either a webcam or a composite video camera like a security
>>> camera or a camcorder, attached to a PC or to a television.
>>>
>>> Two of the features that people with some specific eye conditions
>>> find
>>> very useful, that the commercial devices that cost big money have,
>>> are
>>> the ability to display a negative of what is being viewed and the
>>> ability to display "false colors", so for example, a black and white
>>> page of regular text appears to be yellow text on a blue background.
>>>
>>> On the webcam / PC side I've found a program called dscaler
>>> (http://deinterlace.sourceforge.net/) that does the negative image
>>> with video from a webcam or from a composite camera run through a
>>> usb
>>> video digitizer. Also I've been told some hardware video processors
>>> can do negative of what is being displayed on a camera or from a
>>> video source in real time. The only devices that I've seen so far
>>> that
>>> have this abiliity are pretty expensive in terms of what I'm reying
>>> to
>>> come up with (~ $500 or more). I haven't had much luck finding
>>> anything that does false colors, either on the PC side or the video
>>> side.
>>>
>>> I'm wondering if any of the video professional or enthusiasts that
>>> read these groups could point me towards anything that could produce
>>> the negative and false color video on eith a PC or when displayed on
>>> a
>>> television? If anyone has any advice on this it would be greatly
>>> appreciated.
>>
>>A standalone little box to make the image display in negative
>>form would be pretty easy to make (and inexpensive in moderate
>>quantities). A standalone box to also do arbitrary colors would
>>be a bit more complex to design and expensive to make. There
>>may already be a design for one or both of these out on the WWW
>>somewhere.
>>
>>Should be able to do either/both on a computer if it is sufficiently
>>beefy. Are you sure there isn't software out there that does this
>>already?
>
>
> Thanks for the response Richard, while I found thatthe dscaler
> software can do a negative image, it's real function is to serve as a
> deinterlacer for a home theater setup, and therefore it is very
> resource intensive. I was hoping to find something that would run on
> less that state of the art equipment.
>
> So if I were to search the web for the box you described to do the
> negative of a composite signal, were would you suggest looking, or
> what search terms wouldf you use?

I'm researching to see if I can find the ones I remembered.

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