Webcams again
Rick Sewill
rsewill at cableone.net
Thu Feb 1 12:56:10 UTC 2007
On Thu, 2007-02-01 at 11:06 +0000, Anne Wilson wrote:
> In the thread "webcam support/hardware compatibility list" Riick Sewell wrote
>
> The person at http://mxhaard.free.fr/ was very helpful in getting the
> webcam to sort of work. Unfortunately, my knowledge of webcams and
> color was so limited I could only help him to a point, and he had to
> wait for more knowledgeable people to get this webcam to get the colors
> even close to being correct.
>
> Rick, can you give us some idea of what you had to do? It may give us a clue
> for troubleshooting our own colour problems.
>
I wish I could give a good answer to this question.
The person at http://mxhaard.free.fr had a way to dump registers, from
the webcam. I sent him a message, with these registers. We were lucky
when he made a guess the webcam chip set was similar to a chip set the
driver supported.
He sent me an updated driver, he thought might be able to get an image.
I compiled the driver, from him, and ran a tool, he had on his website,
that showed what was being seen from the webcam. The tool could take a
picture.
I would take a picture and send the picture to him. He would look at
the picture and tell me what lines to change in the driver. I would
change those lines, take another picture, and send him the picture.
We would repeat the process as far as we were able.
He was able to get a picture. The colors in the picture were poor.
What he needed was a person who understood more about cameras and
lighting and color--all things I did not know.
I was a pair of hands. I got lost when he tried to explain the
different color things--YUV, parameters to try for red, green, blue,
gamma. I am not a camera buff. He was very patient with me.
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