[Elphel-support] 答复: 答复: 答复: 答复: 答复: 答复: Re: Quote for 1 NC393-Stereo camera

[Tao Zhang]

BTW, your stereo AE has oscillation and AWB is not accurate. Do you have updated firmware to solve these problems?

Tao Zhang
章   涛

发件人: Winston Zhang
发送时间: 2018年1月8日 16:54
收件人: Oleg <support-list at support.elphel.com>
抄送: Elphel Sales | Olga Filippova <sales at elphel.com>; Dan Pan <admin at blacksesame.com>; Tao Zhang <tao.zhang at blacksesame.com.cn>; Qun Gu <qun.gu at blacksesame.com>
主题: 答复: [Elphel-support] 答复: 答复: 答复: 答复: 答复: Re: Quote for 1 NC393-Stereo camera

Hello
      Thank you for your patient to answer my question. But I have some others as follow.

1)    How should I make the left and right camera AWB change synchronously? The left camera image color is very different with right camera image color. Please look at the last email attachment. I followed your advices, and set the WB_EN=0 and GAINR/GAING/GAINB = some value, and made the left and right camera image WB very close. But it just applies only to one situation. If I change the ambient lighting brightness, the GAINR/GAING/GAINB value should be set again.

2)    How should I make the left and right camera exposure change synchronously? The left and right camera exposure at different time and cause the image brightness different. So, if I capture the same timestamp frames, the frames brightness are so different. I want to do some stereo-match work, but all of these get me into trouble.



Best Regrad!
Yicheng-Zhang
Email:  winston.zhang at blacksesame.com.cn<mailto:winston.zhang at blacksesame.com.cn>
Teil:    18516291005
Addr:   707 room, 7th floor, building 4th, No.1761, Zhangdong road, Pudong area

发件人: andersonnotgood at gmail.com<mailto:andersonnotgood at gmail.com> [mailto:andersonnotgood at gmail.com] 代表 Oleg
发送时间: 2017年12月28日 星期四 3:13
收件人: Winston Zhang <winston.zhang at blacksesame.com.cn<mailto:winston.zhang at blacksesame.com.cn>>
抄送: Elphel Sales | Olga Filippova <sales at elphel.com<mailto:sales at elphel.com>>; Dan Pan <admin at blacksesame.com<mailto:admin at blacksesame.com>>; Tao Zhang <tao.zhang at blacksesame.com.cn<mailto:tao.zhang at blacksesame.com.cn>>; Qun Gu <qun.gu at blacksesame.com<mailto:qun.gu at blacksesame.com>>; elphel support-list <support-list at support.elphel.com<mailto:support-list at support.elphel.com>>
主题: Re: [Elphel-support] 答复: 答复: 答复: 答复: 答复: Re: Quote for 1 NC393-Stereo camera

Hello,

1)    How could I get the raw data of camera. Because when I got the rgb data from multipart jpeg stream, the image had some color blocks if I amplified eight times. I thought it could be caused by image conversion compression.(please look at the attachments).

You can switch to JP4 format<https://wiki.elphel.com/wiki/JP4> - it's close to raw.
What I see in the attached images is they have different white balance. And also there are overexposed areas which can affect the correct balance.

The white balance is run independently for each sensor - you can try to set it so the images look the same and then turn off for both sensors:
a) open the web interface for each sensor<https://wiki.elphel.com/wiki/Tmp_manual#Web_user_interface_.28camvc.29> - click on the green circle OR
b) set WB_EN=0 (also for both channels) in parameters<https://wiki.elphel.com/wiki/Tmp_manual#Change_parameters> - if you change it through a table (http://192.168.0.9 > Parameter Editor > select whiteBalance > View/Edit Current<http://192.168.0.9/parsedit.php?sensor_port=2&title=Parameters+for+groups:+whiteBalance+&GTAB_R&GTAB_G&GTAB_GB&GTAB_B&WB_THRESH&WB_PERIOD&WB_MASK&WB_EN&WB_WHITELEV&WB_WHITEFRAC&WB_MAXWHITE&WB_SCALE_R&WB_SCALE_GB&WB_SCALE_B&GAIN_MIN&GAIN_MAX&GAIN_CTRL&GAIN_STEP&ANA_GAIN_ENABLE>) then there is a broadcast mask to set the parameter for all sensors at the same time - set it to F.

if I amplified eight times.
What are the gains and exposure for each sensor?

2)    The camera temperature has risen quickly, and I could not capture images. Because it was so slowly to run the video when the camera had been opened for four hours. But If I closed the camera and the temperature dropped down, the video was showed normally.

What is the temperature? http://192.168.0.9 > Temperature monitor
If it's around 70-80 it's ok (at 90 degrees the camera is forced to shut down)
Also, the camera should reach the steady temperature pretty much in the the first 30-60 mins.

- what is the image quality?
- what are the exposure times? you can try limiting exposure time. The default fps is 10 - so, It will get slow if exposure times are >100ms.
- is the camera and the pc the only devices in the network? camera connected directly to PC vie cable?
- connect to the camera via ssh and check cpu load:
$ ssh root at 192.168.0.9<mailto:root at 192.168.0.9>
root at elphel393:~# htop
then click on CPU% table header.
- your PC's cpu load? If you are watching from the browser - it might not be able to handle the streams as well.

Best regards,
Oleg Dzhimiev
Electronics Engineer
phone: +1 801 783 5555 x124<tel:(801)%20783-5555>
Elphel, Inc.
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