| Author |
Message |
Glenn
Guest
|
 Posted:
Sun Nov 06, 2005 3:57 am Post subject:
Negative Video and False Colors |
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Hi There,
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.
Thanks Very Much,
Glenn
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Richard Crowley
Guest
|
| Posted:
Sun Nov 06, 2005 5:41 am Post subject:
Re: Negative Video and False Colors |
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"Glenn" wrote ...
| Quote: | 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? |
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Glenn
Guest
|
| Posted:
Sun Nov 06, 2005 11:49 am Post subject:
Re: Negative Video and False Colors |
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|
On Sat, 5 Nov 2005 18:55:02 -0800, "Richard Crowley"
<rcrowley@xpr7t.net> wrote:
| Quote: | "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?
Thanks Again,
Glenn |
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Stan
Guest
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| Posted:
Sun Nov 06, 2005 1:56 pm Post subject:
Re: Negative Video and False Colors |
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glennleduc@comcast.net wrote:
}...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?
Hmmmm...somewhere in the depths of my memory I recall (circa 1980's)
a home dideo camera (not a camcorder) that had an attachment to do
close-ups of 35mm color negatives, with a switch on the back of the
camera to invert the chroma and luminence. Perhaps
someone here may remember a model # and you can find one to experiment
with.
Stan. |
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Richard Crowley
Guest
|
| Posted:
Mon Nov 07, 2005 2:57 am Post subject:
Re: Negative Video and False Colors |
|
|
"Glenn" <glennleduc@comcast.net> wrote in message
news:v26rm11js8c70o6lg5blrgq7sr8hursh0t@4ax.com...
| Quote: | 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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