Dear Andrey.
>From your scripts I've seen that I have to wait at least three frames,
this is what I'm doing [1] in the file.
I was thinking that I can load a certain frame persistently with
CamIP/FrameNumber/bimg, but this doesn't seem to be the case, since
inputting the frame number into the URL with 'elphel_get_frame()'
results in a 1x1 gif, thus a non-existing image.
I have seen that the images in the table of 9 images that you mention
("Last acquired images" when setting parameters) have completely
different numbers in their URL (CamIP/*Number*/bimg), for frame numbers
increasing by one, the *Number* increases by
- approximately 404000 for TRIG_PERIOD=48000000
- approximately 440000 for TRIG_PERIOD=19200000, EXPOS=10000
- approximately 450000 for TRIG_PERIOD=10000000, EXPOS=1000
- approximately 460000 for TRIG_PERIOD=96000000, EXPOS=50000
thus seemingly unrelated to trigger period and exposure time.
Is there no way to construct an URL to load a certain image/frame number
*after* having waited three frames after having set new parameters?
David
[1]: http://git.io/9oWgUg#L77
On 03/26/2013 03:02 AM, support-list wrote:
> Oleg, David,
>
> There is latency in the sensor, so when camera sends i2c command to
> sensor it takes 3 frames before you'll get the frame with new exposure.
> If you do not specify which frame do you want to apply changes to,
> default is 3 frames ahead, and driver "knows" when to send parameters
> change to the sensor so 3 frames after now you'll get the new exposure.
> Different parameters have different latencies, and free
> running/triggered mode also has them different. There is some debug
> feature embedded in parsedit.php - you may change several parameters
> with different delays and open a table of 9 images - each will have
> caption with effective paramer values and frame numbers (some frame that
> are output "bad" by the sensor may be dropped - it happens when you
> change frame format).
>
> Andrey
>
> ---- On Mon, 25 Mar 2013 18:44:56 -0700 *Oleg
> <support-list@support.elphel.com>* wrote ----
>
> Hi David,
>
> When I load the script on the camera [5], I see that the
> parameters are
> changed, as PHP tells me, but the image I load after changing the
> exposure time is the same as before (or at least the brightness
> doesn't
> change), or isn't loaded at all.
>
>
> The problem is that PHP prints the output page once the script is
> done... and the browser starts downloading these images after the
> page is printed - so it always gets the latest images.
>
> What you can do is:
> 1. use "flush();" in PHP - I remember it worked a while ago it but
> couldn't make it work for the past hour.
> 2. if you get "flush()" working you might bump into browser
> buffering images - so, for "src"-tag it's better to make up
> different addresses, e.g.:
>
> <img
> src='http://".$_SERVER['HTTP_HOST'].":8081/img?".microtime()."'
> width='200' />
>
>
> 3. Use AJAX calls with JS to load images and run scripts.
>
> Best regards,
> Oleg Dzhimiev
> Electronics Engineer
> phone: +1 801 783 5555 x124
> Elphel, Inc.
> _______________________________________________
> Support-list mailing list
> Support-list@support.elphel.com
> <mailto:Support-list@support.elphel.com>
> http://support.elphel.com/mailman/listinfo/support-list_support.elphel.com
>
>
>
_______________________________________________
Support-list mailing list
Support-list@support.elphel.com
http://support.elphel.com/mailman/listinfo/support-list_support.elphel.com
