RE: [Leica] RE: Erwin's adventures in digiland. part 1 and 2

["Jean-Claude Berger" <jcberger@jcberger.com>]

Thanks Jim,

I would like to be sure to understand.

Do you state that if I buy a "1024*768" camera, I'll get 256*192
pictures once I'll will have them transfered on my PC? :-o

or

Do you state that if I read the *technical sheet about the CCD*
of the camera and read that it has a "resolution" of 4096*3072,
I'll will get 1024*768 pictures?

 ---
 Jean-Claude Berger (jcberger@jcberger.com)
 Systems and RDBMS consultant (MCSE), Lyon, France
 http://www.jcberger.com

> -----Original Message-----
> From: owner-leica-users@mejac.palo-alto.ca.us
> [mailto:owner-leica-users@mejac.palo-alto.ca.us]On Behalf
> Of Jim Brick
> Sent: Friday, August 13, 1999 4:22 PM
> To: leica-users@mejac.palo-alto.ca.us
> Subject: [Leica] RE: Erwin's adventures in digiland. part 1 and
2
>
>
> This is correct. It takes 4 pixels in the camera, to record
> one image
> pixel. The stated resolution of consumer digital cameras
> must be divided by
> four to get the "real" resolution.
>
> Each row of pixels on the sensor contain only two colors.
> One row of:
>
> RGRGRGRGRGRGRG...
>
> and the following row:
>
> GBGBGBGBGBGBGB...
>
> Then:
>
> RGRGRGRGRGRGRG...
>
> and
>
> GBGBGBGBGBGBGB...
>
> so the rows look like this:
>
> RGRGRGRG...
> GBGBGBGB...
> RGRGRGRG...
> GBGBGBGB...
>
> Draw a square around four pixels:
>
> RG
> GB
>
> and you have the four pixels required to make up the single
> image pixel. As
> Rob said, one RED, one BLUE, and two GREEN pixels per image
pixel.
>
> There are variations, but for the most part, the above is
> true. All brand
> name consumer CCD cameras that I know of are as I described
above.
>
> Jim
>
>
>
> At 12:32 AM 8/14/99 +1000, you wrote:
> >On 13 Aug 99, at 14:52, Jean-Claude Berger wrote:
> >
> >> Hello Erwin,
> >>
> >> Could this be a typo? I thought that each pixel was
> represented by 24 or
> >> 48 bits. How can 4 pixels represent 1 pixel?
> >>
> >> > interpolation. Remember that 4 pixels are needed to record
> >> > one image
> >> > pixel.
> >
> >Jean-Claude,
> >
> >Erwin's comment referred to the capture of images via
> digital camera. The
> >capture array in these devices is a regular square matrix
> ie colour reception
> >elements are placed in a 2x2 dot matrix, not triplets like
> on a conventional
> >CRT. AFAIK the matrix consists of a blue, red and two
> green sensitive
> >pixels, since more information in the green band is
> desirable as green is the
> >frequency to which human sight is most sensitive and
> subsequently most
> >critical. Unfortunately I can't seem to find Jim Brick's
> (?) excellent post
> >from
> >many months ago which outlined the subject.
> >
> >Cheers,
> >
> >Rob Studdert
> >HURSTVILLE AUSTRALIA
> >Tel +61-2-9554-4110
> >Fax +61-2-9554-9259
> >UTC(GMT)  +10 Hours
> >audiob@ozemail.com.au
> >http://www.ozemail.com.au/~distudio/pagelist.html
>
>