size of raw bayer data

size of raw bayer data

[Veda N]

what should be the size of a raw bayer data from the driver.

for 640x480 = i get 640x480x2.

Shouldnt i get more? It shoule be more than yuv422/rgb565

-- 
Regards,
S. N. Veda

Re: size of raw bayer data

[Paulo Assis]

Hi,

2011/8/13 Veda N <veda74@gmail.com>:
> what should be the size of a raw bayer data from the driver.
>
> for 640x480 = i get 640x480x2.

Is this in bytes?

>
> Shouldnt i get more? It shoule be more than yuv422/rgb565
>

No, that depends on the pixel size, so for 8 bit pixel you should get
640x480 bytes, for 12 bit you should get 640x480x3/2 and so on.

640x480x2 is equivalent to a 16 bit pixel, this is a bit unusual I
think, the most common is 8 bit pixel, what device/driver are you
using ?


Regards,
Paulo

> --
> Regards,
> S. N. Veda
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Re: size of raw bayer data

[Veda N]

On Sat, Aug 13, 2011 at 11:56 PM, Paulo Assis <pj.assis@gmail.com> wrote:
> Hi,
>
> 2011/8/13 Veda N <veda74@gmail.com>:
>> what should be the size of a raw bayer data from the driver.
>>
>> for 640x480 = i get 640x480x2.
>
> Is this in bytes?
>
>>
>> Shouldnt i get more? It shoule be more than yuv422/rgb565
>>
>
> No, that depends on the pixel size, so for 8 bit pixel you should get
> 640x480 bytes, for 12 bit you should get 640x480x3/2 and so on.
>
> 640x480x2 is equivalent to a 16 bit pixel, this is a bit unusual I
> think, the most common is 8 bit pixel, what device/driver are you
> using ?

If it is V4L2_PIX_FMT_SGRBG10 - it is 10 bits/color.
If it is V4L2_PIX_FMT_SGRBG8 -   it is 8 bits/color

Shouldnt it be more? raw data is supposed to be large in size when
compared to processed data pixel size.


>
>
> Regards,
> Paulo
>
>> --
>> Regards,
>> S. N. Veda
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-media" in
>> the body of a message to majordomo@vger.kernel.org
>> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>>
>



-- 
Regards,
S. N. Veda

Re: size of raw bayer data

[Sakari Ailus]

On Sun, Aug 14, 2011 at 12:37:10AM +0530, Veda N wrote:
> On Sat, Aug 13, 2011 at 11:56 PM, Paulo Assis <pj.assis@gmail.com> wrote:
> > Hi,
> >
> > 2011/8/13 Veda N <veda74@gmail.com>:
> >> what should be the size of a raw bayer data from the driver.
> >>
> >> for 640x480 = i get 640x480x2.
> >
> > Is this in bytes?
> >
> >>
> >> Shouldnt i get more? It shoule be more than yuv422/rgb565
> >>
> >
> > No, that depends on the pixel size, so for 8 bit pixel you should get
> > 640x480 bytes, for 12 bit you should get 640x480x3/2 and so on.
> >
> > 640x480x2 is equivalent to a 16 bit pixel, this is a bit unusual I
> > think, the most common is 8 bit pixel, what device/driver are you
> > using ?
> 
> If it is V4L2_PIX_FMT_SGRBG10 - it is 10 bits/color.
> If it is V4L2_PIX_FMT_SGRBG8 -   it is 8 bits/color

These formats are byte aligned.

> Shouldnt it be more? raw data is supposed to be large in size when
> compared to processed data pixel size.

No. At VGA size you still have as many pixels as you can guess but any
single pixel is either red, green or blue.

-- 
Sakari Ailus
sakari.ailus@iki.fi