Re: [libdc1394-devel] format 7 ROI size problem

[Damien D. <da...@do...>]

On Thu, 2006-12-14 at 19:29 -0800, Andrew Straw wrote:
> Damien Douxchamps wrote:
> > On Mon, 2006-12-11 at 11:40 -0800, Andrew Straw wrote:
> >   
> >> Hi,
> >>
> >> I recently updated to the latest svn version (rev 335) and have been
> >> testing my programs. Overall, I'm very impressed with the work for v2 of
> >> the library -- thanks to all involved. One issue, though:
> >>
> >> On my cameras dc1394_format7_set_image_size(...) initially appears to
> >> work (no error returned, a later call to dc1394_format7_get_image_size()
> >> returns the value set). However, frames received later still have the
> >> full image size (after receiving from dc1394_capture_dequeue(),
> >> frame->size is the full sensor size), and, moreover, the full frame has
> >> been updated with new image data. Is this a bug with dc1394 or am I
> >> doing something wrong? I don't think this is a bug with my cameras
> >> because they work fine with earlier versions of libdc1394.
> >>     
> >
> > You have to stop capture before resizing the image and set up capture
> > again after. Is it what you are doing?
> >   
> Yes. I'm calling dc1394_video_set_transmission(camera,DC1394_OFF) then 
> dc1394_capture_stop(...) before attempting to change the ROI and 
> dc1394_capture_setup(...) then 
> dc1394_video_set_transmission(camera,DC1394_ON) afterward. Need I do more?
> 
> I just checked at it appears that the commands to 
> SetCameraFormat7Register(...) in format7.c 's 
> _dc1394_format7_set_image_size(...) appear to get through, as judged by 
> 1) lack of error return (I'm checking) and 2) a subsequent call to 
> GetCameraFormat7Register(...) returns the just-set value.
> 
> Can anyone confirm that the ROI set commands _are_ working with current 
> SVN? In other words, do we know if this is a bug with the library or 
> with my use of it? (By the way, I upgraded to the latest svn rev. 339 
> and still no difference to this.)

Format7 does have a problem indeed. I'm trying to fix it at the
moment...

-- 
  _    Damien 高原 Douxchamps, PhD
 ('-   Post-doctoral investigator
 //\   Image Processing Group, NAIST
 V_/_  http://damien.douxchamps.net/