Re: pixel count doubts

[Richard Atterer <richard@2008.atterer.net>]

On Fri, May 16, 2008 at 07:26:27PM +0530, Veda N wrote:
> Hi,
> I am trying to write a camera sensor driver.
> 
> The sensor documents says that -
> For the resolution VGA, The pixel count is 640x480x3.
> 
> I did not understand what is meant by x3 in pixel count.
> 
> Usually it is 60x480. The number of bytes per pixel is 2.
> 
> Does this mean that instead of 2 bytes per pixel. it is 3 bytes?

There isn't really enough information to tell, but probably yes.

Note that it is often the case that a claimed sensor resolution of, say, 
640x480 means that the _Bayer pattern_ resolution is 640x480 - in other 
words, there are that many pixels, but each pixel is only for one of the 
colours red, green or blue, and further interpolation is necessary to get a 
640x480 RGB picture.

So the "640x480x3" /could/ mean "3 subpixels for each image pixel", but I 
strongly doubt it; Foveon sensors are fairly rare in webcams. ;-)

> How should i account this pixel count in my driver.
> How much should be  bytesperline and sizeimage
> How should i account this in my application as well.

I think you will have to play around to see what the exact data format is. 

Cheers,

  Richard

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