Re: FW: [Vxl-users] New User question

[Alain-Serge N. <ake...@fr...>]

On Monday 28 June 2004 11:27, Ian Scott wrote:
Hello Ian,
	Thanks for the info.

Best regards,
Alain-Serge
> > -----Original Message-----
> > From: vxl...@li...
> > [mailto:vxl...@li...]On Behalf Of Alain-Serge
> > Nagni
> > Sent: Sunday, June 27, 2004 11:15 PM
> > To: vxl...@li...
> > Subject: [Vxl-users] New User question
> >
> >
> > Hello,
> > 	I'm a new user and I just installed the vxl libraries.
> > I'm using v4l
> > (video4linux) with which I grab pictures from a camera. The
> > picture are
> > located in a memory map (I have a pointer on the memory map).
> > How can I
> > create a "vil_image_view" instance from that buffer? Is There
> > a class,
> > function that could help ?
>
> One of the constructors of vil_image_view<T> was written just for this
> case.
>
>
> vil_image_view<T> frame(buffer_ptr,
>                         ni, nj, num_planes_or_components,
>                         i_step, j_step, plane_step);
>
>
> vil will wrap the buffer with the view.
>
> So if you had a 320x240 RGB image, tightly packed, arranged RGBRGBRGB, with
> the top raster first, you would do:
>
> vil_image_view<vxl_byte> frame(buffer_ptr,
> 					 320, 240, 3,
> 					 3, 3*320, 1);
> which would give you a 3-plane image. Or if you wnat a single plane image
> of RGBs vil_image_view<vil_rgb<vxl_byte> > frame(buffer_ptr,
> 					           320, 240, 1,
> 					           1, 320, 320*240);
>
> Ian.
>
>
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