[Elphel-support] 答复: 答复: 答复: 答复: 答复: sync stereo with lidar

[David Zhang]

Hi, Andrey,


We use default configuration(TRIG=4 and TRIG_PERIOD=25000000). Is that OK? And now our situation is there are timestamps in EXIF header. But it is not

the kernel's system time.

e.g. the timestamp in EXIF may be 2018/09/14 but actually system's date is 2018/09/18.

How can i fix it? Thanks.


Best,

David




________________________________
发件人: Elphel Support <support-list at support.elphel.com>
发送时间: 2018年9月18日 10:03:19
收件人: Winston Zhang
抄送: Winston Zhang; Tao Zhang; Qun Gu; David Zhang
主题: Re: [Elphel-support] 答复: 答复: 答复: 答复: sync stereo with lidar

Winston,

What trigger settings do you use ( https://wiki.elphel.com/wiki/Trigger_393 )?
Trigger 393 - ElphelWiki - wiki.elphel.com<https://wiki.elphel.com/wiki/Trigger_393>
wiki.elphel.com
Description. 10389 board is required. The triggering is used for one or several cameras synchronization or setting the frame rate (or fps). The conditions of the trigger can be generated either internally or externally.




Camera channels should be in triggered mode (TRIG=4) and have  correct TRIG_PERIOD. Then all channels will be exactly synchronized. If you set TRIG_PERIOD to some "even" number (like exactly  10fps with TRIG_PERIOD=10000000), then timestamps will have all digits but seconds and tenths of a second the same for all frames.

Andrey


---- On Mon, 17 Sep 2018 18:31:26 -0700 <winston.zhang at bst.ai> wrote ----

Hi, Andrey!
    I captured some images form camera with the timestamp image name. This timestamp was the same with camera system timestamp. And the other way,  each image had its exif information that contained the real timestamp. But this timestamp from exif information was not the same with system timestamp. So can you provided some detials about where was the exif timestamp  from. And how did i do can solve this problem.

(i had synchronized the camera system time with the GPS timestamp.)

________________________________


-----------------------------------------------------------

Best Regrad!

Yicheng-Zhang

Email:  winston.zhang at bst<mailto:winston.zhang at blacksesame.com.cn>.ai

Tel:    18516291005

Addr:   707 room, 7th floor, building 4th, No.1761, Zhangdong road, Pudong area


发件人： Oleg<mailto:support-list at support.elphel.com>
发送时间： 2018-05-12 06:32
收件人： Winston Zhang<mailto:winston.zhang at blacksesame.com.cn>
抄送： Tao Zhang<mailto:tao.zhang at blacksesame.com.cn>; Qun Gu<mailto:qun.gu at blacksesame.com>; David Zhang<mailto:david.zhang at blacksesame.com.cn>; elphel support-list<mailto:support-list at support.elphel.com>
主题： Re: [Elphel-support] 答复: 答复: 答复: 答复: sync stereo with lidar
Winston,

I could get the info from the 192.168.0.9:2323<http://192.168.0.9:2323>. This web could help me to get some information. But if I tried the http://192.168.0.9:2323/timestamp_name, the timestamp file saved web did not appear. How did I use it?

http://192.168.0.9:2323/pointer_value/img

Try the following:
1. get diagnostics.php<https://git.elphel.com/Elphel/elphel-web-393/blob/master/src/diagnostics/diagnostics.php>
2. copy to 192.168.0.9:/www/pages/
3. In the browser open:
view-source:http://192.168.0.9/diagnostics.php?pointers

You will get xml output similar to this one:
<?xml version='1.0' standalone='yes'?>
<Document>
<camera ip='192.168.0.9'>
<port index='0' sensor='mt9p006, none, none, none' mux='none'>
<timestamps>
                        ...
<ts frame='7290' ts='1526075540.347616' ptr='pointer_value'>1526075540.347616</ts>
...

Take the pointer_value from the last <ts> for a particular port. Don't forget to add "/img" or "/bimg".

If something does not work. Please send me your xml.

Best regards,
Oleg Dzhimiev
Electronics Engineer
phone: +1 801 783 5555 x124
Elphel, Inc.
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