Re: [Elphel-support] 答复: 答复: 答复: sync stereo with lidar
Hi, > Another question is the two camera timestamp are not the same no matter > whether or not we connect the gps. Is the difference random? Supposing sensors run at default 10fps - do the last 4-5 digits (of microseconds) of timestamps match? Also, what timestamps do you read from: 192.168.0.9/parsedit.php > there's link to 9 image previews with timestamps - run for port 0 and 1 Best regards, Oleg Dzhimiev Electronics Engineer phone: +1 801 783 x124 Elphel, Inc. ___ Support-list mailing list Support-list@support.elphel.com http://support.elphel.com/mailman/listinfo/support-list_support.elphel.com
Re: [Elphel-support] 答复: 答复: 答复: sync stereo with lidar
Hello Winston, 1) Video streamer format does not allow Exif data, you need to acquire images from the imgsrv - there is a min ihelp at 192.168.0.9:2323 (without any other parameters). Saving images from it preserve all Exif data. It is also preserved when using camogm to record video sequence to the SSD/HDD 2) By default camera sensors are running in free running mode and so they are not synchronized. To synchronize them you need to use either external sync or just trigger them from the internal FPGA generator. Set TRIG=4 (triggered mode) and TRIG_CONDITION=0 (internal FPGA generator). See details on the wiki page: https://wiki.elphel.com/wiki/Trigger_393 Andrey On Thu, 10 May 2018 18:50:00 -0700 Winston Zhang winston.zh...@blacksesame.com.cn wrote Hi, Oleg We tried the USB GPS and it worked. The system could detect the device. And 192.168.0.9:2323/meta had GPS related tags. That info was just showed on the web. I could see it but I could not get it. Do you know how to get it? Another question is the two camera timestamp are not the same no matter whether or not we connect the gps. ___ Support-list mailing list Support-list@support.elphel.com http://support.elphel.com/mailman/listinfo/support-list_support.elphel.com
[Elphel-support] 答复: 答复: 答复: sync stereo with lidar
Hi, Oleg We tried the USB GPS and it worked. The system could detect the device. And 192.168.0.9:2323/meta<http://192.168.0.9:2323/meta> had GPS related tags. That info was just showed on the web. I could see it but I could not get it. Do you know how to get it? Another question is the two camera timestamp are not the same no matter whether or not we connect the gps. [cid:image001.png@01D3E90D.697BE410] Best Regrad! Yicheng-Zhang Email: winston.zh...@blacksesame.com.cn Teil:18516291005 Addr: 707 room, 7th floor, building 4th, No.1761, Zhangdong road, Pudong area 发件人: andersonnotg...@gmail.com [mailto:andersonnotg...@gmail.com] 代表 Oleg 发送时间: 2018年5月11日 星期五 2:55 收件人: Tao Zhang <tao.zh...@blacksesame.com.cn> 抄送: Winston Zhang <winston.zh...@blacksesame.com.cn>; Qun Gu <qun...@blacksesame.com>; David Zhang <david.zh...@blacksesame.com.cn>; elphel support-list <support-list@support.elphel.com> 主题: Re: [Elphel-support] 答复: 答复: sync stereo with lidar Hi, Olga will send you a quote. Meanwhile, you can test your USB GPS. Plug it in the "eSATA+USB" port (https://wiki.elphel.com/wiki/File:NC393-CS_marked_ports.jpeg) Then to check if it's working: a. $ ssh root@192.168.0.9<mailto:root@192.168.0.9> elphel393~# dmesg | grep Garmin [ 47.236566] usb 1-1.4: new full-speed USB device number 3 using ci_hdrc [ 47.398450] garmin_gps 1-1.4:1.0: Garmin GPS usb/tty converter detected [ 47.405759] usb 1-1.4: Garmin GPS usb/tty converter now attached to ttyUSB0 b. 192.168.0.9:2323/meta<http://192.168.0.9:2323/meta> will have GPS related tags: ... "2" "2018:05:07 22:29:14.00" "-111.885652" "40.780143" "1378.20" ... If b. works then camera images are geotagged. Best regards, Oleg Dzhimiev Electronics Engineer phone: +1 801 783 x124 Elphel, Inc. ___ Support-list mailing list Support-list@support.elphel.com http://support.elphel.com/mailman/listinfo/support-list_support.elphel.com
Re: [Elphel-support] 答复: 答复: 答复: sync stereo with lidar
Hello Allen, I can not reproduce your setup because we do not have any computer with MS Windows here, I haven't used this family of OS since 2001. Yes, Eclipse is a multi-platform program, but we never tested our code with Windows, so there could be our bugs when running on Windows. Can you please try installation it with (K)ubuntu 16.04 LTS? Then I will be able to reproduce all the steps. Andrey On Tue, 20 Mar 2018 02:35:29 -0700 Allen Yinallen@blacksesame.com.cn wrote Hi Andrey, I follow the steps on the web page: 1. Download plugin “git clone https://git.elphel.com/Elphel/imagej-elphel.git” 2. Download Eclipse IDE for Java EE Developers, get the “Eclipse Java Oxygen” for 64bit 3. Edit “eclipse.ini”, see “1.jpg”, I could find “-clean -startup” and “-XX :MaxPermSize” these two items in the file, so I modify the file as “2.jpg” 4. In eclipse , “File - Import - Existing Maven Projects - set imagej-elphel as Root Directory - a project will appear in the project list - Finish ” 5. “Run Configurations - select Java Application - New Launch Configuration - find the needed plugin class - Run”, see “3.jpg” and “4.jpg” It could not build the plugin. Could you please help us to setup this environment and give us more detailed steps ? OS: Windows 10 Thanks, Allen Yin ___ Support-list mailing list Support-list@support.elphel.com http://support.elphel.com/mailman/listinfo/support-list_support.elphel.com
[Elphel-support] 答复: 答复: 答复: sync stereo with lidar
Hello, Andrey, I need information inside camera. How can I get jp4 format image? What is the image default format? If I try the command line “wget http://192.168.0.9:2323/img -O filename.jp4<http://192.168.0.9:2323/img%20-O%20filename.jp4>”, Can I get the jp4 format Image? Thank you! ” Best Regrad! Yicheng-Zhang Email: winston.zh...@blacksesame.com.cn Teil:18516291005 Addr: 707 room, 7th floor, building 4th, No.1761, Zhangdong road, Pudong area 发件人: Andrey Filippov [mailto:and...@elphel.com] 发送时间: 2018年3月2日 星期五 10:47 收件人: Winston Zhang <winston.zh...@blacksesame.com.cn>; Elphel Support <support-list@support.elphel.com> 抄送: Tao Zhang <tao.zh...@blacksesame.com.cn>; Elphel Support <support-list@support.elphel.com>; Elphel Sales | Olga Filippova <sa...@elphel.com>; Qun Gu <qun...@blacksesame.com>; Pioneer Li <pioneer...@blacksesame.com.cn> 主题: Re: 答复: 答复: [Elphel-support] sync stereo with lidar Hello Winston, Do you need information inside camera or for post-processing on a host PC? Sensor has 12 bits, and using JP4 format (https://wiki.elphel.com/wiki/JP4) you can restore image data with the error less than the pixel shot noise Here is an article explaining why it is so: http://linuxdevices.io/how-many-bits-are-really-needed-in-the-image-pixels/ With ImageJ plugin you can convert JP4 file to 32-bit TIFF Andrey On Thu, 01 Mar 2018 17:17:14 -0800 Winston Zhang<winston.zh...@blacksesame.com.cn<mailto:winston.zh...@blacksesame.com.cn>> wrote Hello, Does this camera image pixel have 10 bit of the single channel? And how can I get it? Thank you. Best Regrad! Yicheng-Zhang Email: winston.zh...@blacksesame.com.cn<mailto:winston.zh...@blacksesame.com.cn> Teil:18516291005 Addr: 707 room, 7th floor, building 4th, No.1761, Zhangdong road, Pudong area 发件人: Andrey Filippov [mailto:and...@elphel.com<mailto:and...@elphel.com>] 发送时间: 2018年2月1日 星期四 13:49 收件人: Tao Zhang <tao.zh...@blacksesame.com.cn<mailto:tao.zh...@blacksesame.com.cn>> 抄送: Elphel Support <support-list@support.elphel.com<mailto:support-list@support.elphel.com>>; Elphel Sales | Olga Filippova <sa...@elphel.com<mailto:sa...@elphel.com>>; Winston Zhang <winston.zh...@blacksesame.com.cn<mailto:winston.zh...@blacksesame.com.cn>>; Qun Gu <qun...@blacksesame.com<mailto:qun...@blacksesame.com>>; Pioneer Li <pioneer...@blacksesame.com.cn<mailto:pioneer...@blacksesame.com.cn>> 主题: Re: 答复: [Elphel-support] sync stereo with lidar Tao, USB GPS does not have 1pps signal (only serial has), precise synchronization is not possible that way. GPS time is available in each frame Exif header data - recorded on internal SSD or sent over the network. The high resolution time stamps (1 microsecond step) are also provided with each image, but they use internal camera clock, not the GPS. This is why for precise synchronization you need to use event logger- it records events and timestamps them using the same clock. If you had serial GPS with https://wiki.elphel.com/wiki/103696 - you would still need to use event logger - with serial GPS there will be 1 PPS precise GPS events timestamped with camera internal clock, and the images timestamped wit the same clock - that provides absolute calibration for the camera internal clock. Without serial GPS you may use pulses from the LIDAR (it is possible to provide LIDAR pulse number over the Ethernet in addition to the precise time over the sync cable) Andrey On Wed, 31 Jan 2018 18:12:00 -0800 Tao Zhang<tao.zh...@blacksesame.com.cn<mailto:tao.zh...@blacksesame.com.cn>> wrote Hi Andrey, We prefer to use GPS to synchronize stereo with lidar. Where do those images that contain timestamp store in internal disk? Can we get it from ethernet continuously? Tao Zhang 章 涛 发件人: Andrey Filippov [mailto:and...@elphel.com<mailto:and...@elphel.com>] 发送时间: 2018年2月1日 1:52 收件人: Tao Zhang <tao.zh...@blacksesame.com.cn<mailto:tao.zh...@blacksesame.com.cn>> 抄送: Elphel Support <support-list@support.elphel.com<mailto:support-list@support.elphel.com>>; Elphel Sales | Olga Filippova <sa...@elphel.com<mailto:sa...@elphel.com>>; Winston Zhang <winston.zh...@blacksesame.com.cn<mailto:winston.zh...@blacksesame.com.cn>>; Qun Gu <qun...@blacksesame.com<mailto:qun...@blacksesame.com>>; Pioneer Li <pioneer...@blacksesame.com.cn<mailto:pioneer...@blacksesame.com.cn>> 主题: Re: [Elphel-support] sync stereo with lidar Hi Tao, There are several ways how to do that: One method would be be to get camera sync pulses for each frame and use external electronics to match with the LIDAR. Another is to provide pulses from the LIDAR to the camera and record them with in-camera FPGA logger (https://wiki.elphel.com/wiki/E
