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

Oleg support-list at support.elphel.com
Mon May 7 09:41:03 PDT 2018 

Hello,

Yes, there is a simpler way:

Step 1:
~$ ssh-copy-id root at 192.168.0.9

Step 2:
~$. ./oe-init-build-env

Step 3:
~$ bitbake apps-autoexposure -c compile -f
~$ bitbake apps-autoexposure -c target_scp -f

And the rebuilt application will be copied to the camera. Then restart the
application for all channels (mask=0xf) or reboot:
AUTOEXP_ON = 0
AUTOEXP_ON = 1

Then just repeat step 3 when you change the source code.

if you have setup Eclipse project then "Build project" from Eclipse already
includes steps 2 and 3 (but make sure you run step 1 once from the
terminal).

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

On Mon, May 7, 2018 at 12:33 AM, Allen Yin <allen.yin at blacksesame.com.cn>
wrote:

> Hi, Andrey
>
>
>
> If I modify the code of “elphel-apps-autoexposure”and want to rebuild it,
> what should I do?
>
>
>
> I  use “. ./oe-init-build-env” and “bitbake core-image-elphel393”, it
> costs about 20 minutes to rebuilt. Is there any simple way to rebuilt it?
>
>
>
>
>
> Thanks,
>
>
>
> Allen Yin
>
>
>
> *发件人:* Elphel Support [mailto:support-list at support.elphel.com
> <support-list at support.elphel.com>]
> *发送时间:* 2018年4月24日 星期二 23:24
> *收件人:* Winston Zhang <winston.zhang at blacksesame.com.cn>; Elphel List <
> support-list at support.elphel.com>
> *抄送:* Elphel Sales | Olga Filippova <sales at elphel.com>; Tao Zhang <
> tao.zhang at blacksesame.com.cn>; Qun Gu <qun.gu at blacksesame.com>
> *主题:* Re: [Elphel-support] 答复: 答复: 答复: 答复: 答复: 答复: 答复: 答复: 答复: Re: Quote
> for 1 NC393-Stereo camera
>
>
>
> Hello Winston,
>
> There are several parameters that tell autoexposure daemon - what to do.
> The main are autoexposure window (it will not pay attention to anything
> outside of it), and then
> AEXP_FRACPIX (0..100% in GUI, 0..0xffff in parameter editor)
> AEXP_LEVEL(0..255 in GUI, 0..0xffff in parameter editor)
>
>
> Autoexposure daemon "looks" at the histogram calculated inside
> autoexposure window and tries to adjust exposure so that AEXP_FRACPIX
> fraction of the pixels inside the selected window will have value below
> AEXP_LEVEL.
>
> In your case you have too much area of the bright lights (it is more that
> 100%-AEXP_FRACPIX%) for your current settings. You should allow lights to
> be overexposed and do one of the following:
> 1) change the window so it will not contain any lights (when capturing
> outdoor images you may set window below the Sun level)
> or
> 2) reduce the AEXP_FRACPIX to be lower than 100%- percent of pixels
> corresponding to lamps.
>
> When using camvc gui you may do it this way:
>
> 1) turn of autoexposure and manually set desired exposure.
> 2) move the top slider (AEXP_LEVEL) on the autoexposure settings (
> https://wiki.elphel.com/wiki/Autoexposure ), the second slider
> (AEXP_FRACPIX) will move to reflect requirec value of the AEXP_FRACPIX to
> produce the exposure you selected manually
> 2) turn autoexposure on - it will follow your settings.
>
> Andrey
>
>
>
> ---- On Mon, 23 Apr 2018 23:00:43 -0700 *Winston Zhang<*
> *winston.zhang at blacksesame.com.cn* <winston.zhang at blacksesame.com.cn>*>*
> wrote ----
>
> Hi, Andrey.
>
> 1.    I have updated the firmware successfully(version 20180416), But I
> could not fix the two camera AE sync problem?
>
> 2.    The camera AE value was very small, the value was set as fellow.
> But actually, the environment light was just suitable.[image:
> cid:0.28873813030.6547749787680422456.162f840db4b__inline__img__src]
>
>
>
>
>
>
>
> *Best Regrad!*
>
> *Yicheng-Zhang*
>
> *Email:  **winston.zhang at blacksesame.com.cn*
> <winston.zhang at blacksesame.com.cn>
>
> *Teil:    18516291005*
>
> *Addr:   707 room, 7th floor, building 4th, No.1761, Zhangdong road,
> Pudong area*
>
>
>
> *发件人**:* Elphel Support [mailto:support-list at support.elphel.com]
> *发送时间**:* 2018年1月9日 星期二 10:03
> *收件人**:* Winston Zhang <winston.zhang at blacksesame.com.cn>;
> support-list at support.elphel.com
> *抄送**:* Tao Zhang <tao.zhang at blacksesame.com.cn>; Elphel Sales | Olga
> Filippova <sales at elphel.com>; Qun Gu <qun.gu at blacksesame.com>
> *主题**:* Re: [Elphel-support] 答复: 答复: 答复: 答复: 答复: 答复: 答复: 答复: Re: Quote
> for 1 NC393-Stereo camera
>
>
>
> Hello Winston,
>
> got the video - difficult to tell w/o settings. Can you open these URLs
> (modify IP if needed) and post the values?
>
> for port 0:
>
> http://192.168.0.9/parsedit.php?sensor_port=0&EXPOS&WOI_
> LEFT&WOI_TOP&WOI_WIDTH&WOI_HEIGHT&AUTOEXP_ON&HISTWND_
> RWIDTH&HISTWND_RHEIGHT&HISTWND_RLEFT&HISTWND_RTOP&
> AUTOEXP_EXP_MAX&AEXP_FRACPIX&AEXP_LEVEL&AE_THRESH&AE_PERIOD
>
> for port 1:
>
> http://192.168.0.9/parsedit.php?sensor_port=1&EXPOS&WOI_
> LEFT&WOI_TOP&WOI_WIDTH&WOI_HEIGHT&AUTOEXP_ON&HISTWND_
> RWIDTH&HISTWND_RHEIGHT&HISTWND_RLEFT&HISTWND_RTOP&
> AUTOEXP_EXP_MAX&AEXP_FRACPIX&AEXP_LEVEL&AE_THRESH&AE_PERIOD
>
> Andrey
>
>
>
>
>
> ---- On Mon, 08 Jan 2018 17:33:51 -0800 *Winston Zhang<*
> *winston.zhang at blacksesame.com.cn* <winston.zhang at blacksesame.com.cn>*>*
> wrote ----
>
> Hi Andrey,
>
>       Please receive the attachment.
>
>
>
>
>
>
>
> *Best Regrad!*
>
> *Yicheng-Zhang*
>
> *Email:  **winston.zhang at blacksesame.com.cn*
> <winston.zhang at blacksesame.com.cn>
>
> *Teil:    18516291005*
>
> *Addr:   707 room, 7th floor, building 4th, No.1761, Zhangdong road,
> Pudong area*
>
>
>
> *发件人**:* Elphel Support [mailto:support-list at support.elphel.com]
> *发送时间**:* 2018年1月9日 星期二 9:24
> *收件人**:* Tao Zhang <tao.zhang at blacksesame.com.cn>
> *抄送**:* Winston Zhang <winston.zhang at blacksesame.com.cn>; Elphel Sales |
> Olga Filippova <sales at elphel.com>; Qun Gu <qun.gu at blacksesame.com>
> *主题**:* Re: 答复: [Elphel-support] 答复: 答复: 答复: 答复: 答复: 答复: Re: Quote for 1
> NC393-Stereo camera
>
>
>
> Tao,
>
> OK, will wait for the picture. White balance does not need to change for
> the outdoor (maybe for night city with electrical lights - and I still
> recommend to use presets). You see there are conditions when it is easy to
> fool AWB, and while it may be OK for just a regular camera, you need to
> know exactly how the image is processed to match multiple images.
>
> The AWB algorithm is rather simple. It assumes that the brightest object
> in the scene is white - and in most cases it works. But when there is
> nothing white in the scene - AWB fails.
>
> With AE you may try to change those values I mentioned earlier.
>
> Andrey
>
>
> ---- On Mon, 08 Jan 2018 17:06:43 -0800 *Tao Zhang<*
> *tao.zhang at blacksesame.com.cn* <tao.zhang at blacksesame.com.cn>*>* wrote
> ----
>
> Hi Andrey,
>
> We will fix the camera on a car. The light condition may change. AWB need
> to adapt to the change. For AE, the scene is normal in the office, there is
> not bright light. But it cannot converge to a stable status. We will attach
> images and videos of those problems later.
>
>
>
> Tao Zhang
>
> 章   涛
>
>
>
> *发件人**:* Elphel Support [mailto:support-list at support.elphel.com]
> *发送时间**:* 2018年1月9日 4:02
> *收件人**:* Tao Zhang <tao.zhang at blacksesame.com.cn>; Elphel List <
> support-list at support.elphel.com>
> *抄送**:* Winston Zhang <winston.zhang at blacksesame.com.cn>; Elphel Sales |
> Olga Filippova <sales at elphel.com>; Qun Gu <qun.gu at blacksesame.com>
> *主题**:* Re: [Elphel-support] 答复: 答复: 答复: 答复: 答复: 答复: Re: Quote for 1
> NC393-Stereo camera
>
>
>
> Tao,
>
> I did not get the attached image to see your problem, but I expect you
> just need to modify the settings. Camera has a flexible control over AWB
> and AE to provide optimal operation for different lighting conditions. Most
> likely problem of of the instability is that there is a bright light source
> in the field of view.
>
> First you need to make AE stable, then set or disable AWB (it only needs
> to be changed when you move from the indoors to outdoors), so if you work
> outdoors you may just set AWB once and then save parameters - that will
> make image matching easier.
>
> For AE you may control:
> 1) the AE window (camera will only consider exposure for the selected
> rectangle, ignoring lights outside it.
> 2) The fraction of pixels that should have intensity values below certain
> threshold - reduce default value if there are lights in the FOV (especially
> electrical lights that have flicker)
> 3) The level (default 250) - target of autoexposure.
> There are some illustrations on the wiki: https://wiki.elphel.com/wiki/
> Autoexposure
>
> Andrey
>
> ---- On Mon, 08 Jan 2018 01:10:17 -0800 *Tao Zhang<*
> *tao.zhang at blacksesame.com.cn* <tao.zhang at blacksesame.com.cn>*>* wrote
> ----
>
> 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*
> <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
> <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>
> *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>; elphel support-list <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/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 <http://mailto:root@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
> Elphel, Inc.
>
> _______________________________________________
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>
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