Re: [Elphel-support] 答复: 答复: 答复: 答复: 答复: 答复: sync stereo with lidar
Hi, Winston You may use scp command ( https://linux.die.net/man/1/scp ) to copy files. For convenience you may also run ssh-copy-id root@192.168.0.9 (or whatever IP you have) so the ssh and scp commands will not ask for the password. Of course it all applies to GNU/Linux OS. MS Windows may have something similar, I do not know. Andrey On Sun, 15 Apr 2018 23:46:54 -0700 Winston Zhangwinston.zh...@blacksesame.com.cn wrote Hi, Andrey That way is work. Is there any way to download the files on the camera disk to the computer? I downloaded it from the web. It was so slow to download all the files. 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: Elphel Support [mailto:support-list@support.elphel.com] 发送时间: 2018年4月16日 星期一 11:40 收件人: Winston Zhang winston.zh...@blacksesame.com.cn; Elphel List support-list@support.elphel.com 抄送: Allen Yin allen@blacksesame.com.cn; Pioneer Li pioneer...@blacksesame.com.cn; Tao Zhang tao.zh...@blacksesame.com.cn; Qun Gu qun...@blacksesame.com 主题: Re: [Elphel-support] 答复: 答复: 答复: 答复: 答复: sync stereo with lidar Hello Winston, You may try to delete all autocampars*.* files from /etc/elphel393 in the camera and reboot. Your saved settings will be lost - you may first copy autocampars*.xml somewhere else or just use *.backup files if you did not reboot too many times since you've got that problem. If after boot camera will not find those files, it will create default ones. Andrey On Sun, 15 Apr 2018 19:59:09 -0700 Winston Zhang winston.zh...@blacksesame.com.cn wrote Hi Andrey! The camera could be ping success. And the camera Linux system could be login. 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: Winston Zhang 发送时间: 2018年4月16日 星期一 10:54 收件人: 'Elphel Support' support-list@support.elphel.com; Allen Yin allen@blacksesame.com.cn 抄送: Pioneer Li pioneer...@blacksesame.com.cn; Tao Zhang tao.zh...@blacksesame.com.cn; Qun Gu qun...@blacksesame.com 主题: 答复: [Elphel-support] 答复: 答复: 答复: 答复: sync stereo with lidar Hi, Andrey Today, I met an problem. The camera setting web http://192.168.0.9/autocampars.php?sensor_port=0 and other related web were not be opened. This problem was not met ago. I guessed some setting of my internet was wrong, such as proxy setting. And I found an new clear computer and tried it again, and the problem was always there. So, I want to know why? Did you update the web services? 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: Elphel Support [mailto:support-list@support.elphel.com] 发送时间: 2018年3月22日 星期四 8:01 收件人: Allen Yin allen@blacksesame.com.cn; Elphel List support-list@support.elphel.com 抄送: Pioneer Li pioneer...@blacksesame.com.cn; Tao Zhang tao.zh...@blacksesame.com.cn; Qun Gu qun...@blacksesame.com; Winston Zhang winston.zh...@blacksesame.com.cn 主题: Re: [Elphel-support] 答复: 答复: 答复: 答复: sync stereo with lidar Hello Allen, I fixed master branch, should work now Andrey On Wed, 21 Mar 2018 01:25:58 -0700 Allen Yinallen@blacksesame.com.cn wrote Hi Andrey, I have a try on the Ubuntu 14.04. It seems there are some conflicts in the code. When I compile, there are some error. But I press run, ImageJ will work. I don’t know why. All steps follow the web page. If we get the gamma value, how to calculate the 12-bit pixel value. If gamma is 0.57, equation is: out(8bit) = a*in(12bit)^0.57, a = 2 .23? Thanks, Allen Yin 发件人: Elphel Support support-list@support.elphel.com 发送时间: 2018年3月21日, 星期三 0:40 收件人: Allen Yin allen@blacksesame.com.cn; Elphel List support-list@support.elphel.com 抄送: Tao Zhang tao.zh...@blacksesame.com.cn; Pioneer Li pioneer...@blacksesame.com.cn; Winston Zhang winston.zh...@blacksesame.com.cn; Qun Gu qun...@blacksesame.com; Elphel Sales | Olga Filippova sa...@elphel.com 主题: Re: 答复: [Elphel-support] 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
[Elphel-support] 答复: 答复: 答复: 答复: 答复: 答复: sync stereo with lidar
Hi, Andrey That way is work. Is there any way to download the files on the camera disk to the computer? I downloaded it from the web. It was so slow to download all the files. 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: Elphel Support [mailto:support-list@support.elphel.com] 发送时间: 2018年4月16日 星期一 11:40 收件人: Winston Zhang <winston.zh...@blacksesame.com.cn>; Elphel List <support-list@support.elphel.com> 抄送: Allen Yin <allen@blacksesame.com.cn>; Pioneer Li <pioneer...@blacksesame.com.cn>; Tao Zhang <tao.zh...@blacksesame.com.cn>; Qun Gu <qun...@blacksesame.com> 主题: Re: [Elphel-support] 答复: 答复: 答复: 答复: 答复: sync stereo with lidar Hello Winston, You may try to delete all autocampars*.* files from /etc/elphel393 in the camera and reboot. Your saved settings will be lost - you may first copy autocampars*.xml somewhere else or just use *.backup files if you did not reboot too many times since you've got that problem. If after boot camera will not find those files, it will create default ones. Andrey On Sun, 15 Apr 2018 19:59:09 -0700 Winston Zhang <winston.zh...@blacksesame.com.cn<mailto:winston.zh...@blacksesame.com.cn>> wrote Hi Andrey! The camera could be ping success. And the camera Linux system could be login. 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: Winston Zhang 发送时间: 2018年4月16日 星期一 10:54 收件人: 'Elphel Support' <support-list@support.elphel.com<mailto:support-list@support.elphel.com>>; Allen Yin <allen@blacksesame.com.cn<mailto:allen@blacksesame.com.cn>> 抄送: Pioneer Li <pioneer...@blacksesame.com.cn<mailto:pioneer...@blacksesame.com.cn>>; Tao Zhang <tao.zh...@blacksesame.com.cn<mailto:tao.zh...@blacksesame.com.cn>>; Qun Gu <qun...@blacksesame.com<mailto:qun...@blacksesame.com>> 主题: 答复: [Elphel-support] 答复: 答复: 答复: 答复: sync stereo with lidar Hi, Andrey Today, I met an problem. The camera setting web http://192.168.0.9/autocampars.php?sensor_port=0 and other related web were not be opened. This problem was not met ago. I guessed some setting of my internet was wrong, such as proxy setting. And I found an new clear computer and tried it again, and the problem was always there. So, I want to know why? Did you update the web services? 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: Elphel Support [mailto:support-list@support.elphel.com] 发送时间: 2018年3月22日 星期四 8:01 收件人: Allen Yin <allen@blacksesame.com.cn<mailto:allen@blacksesame.com.cn>>; Elphel List <support-list@support.elphel.com<mailto:support-list@support.elphel.com>> 抄送: Pioneer Li <pioneer...@blacksesame.com.cn<mailto:pioneer...@blacksesame.com.cn>>; Tao Zhang <tao.zh...@blacksesame.com.cn<mailto:tao.zh...@blacksesame.com.cn>>; Qun Gu <qun...@blacksesame.com<mailto:qun...@blacksesame.com>>; Winston Zhang <winston.zh...@blacksesame.com.cn<mailto:winston.zh...@blacksesame.com.cn>> 主题: Re: [Elphel-support] 答复: 答复: 答复: 答复: sync stereo with lidar Hello Allen, I fixed master branch, should work now Andrey On Wed, 21 Mar 2018 01:25:58 -0700 Allen Yin<allen@blacksesame.com.cn<mailto:allen@blacksesame.com.cn>> wrote Hi Andrey, I have a try on the Ubuntu 14.04. It seems there are some conflicts in the code. When I compile, there are some error. But I press run, ImageJ will work. I don’t know why. All steps follow the web page. If we get the gamma value, how to calculate the 12-bit pixel value. If gamma is 0.57, equation is: out(8bit) = a*in(12bit)^0.57, a = 2 .23? Thanks, Allen Yin 发件人: Elphel Support <support-list@support.elphel.com<mailto:support-list@support.elphel.com>> 发送时间: 2018年3月21日, 星期三 0:40 收件人: Allen Yin <allen@blacksesame.com.cn<mailto:allen@blacksesame.com.cn>>; Elphel List <support-list@support.elphel.com<mailto:support-list@support.elphel.com>> 抄送: Tao Zhang <tao.zh...@blacksesame.com.cn<mailto:tao.zh...@blacksesame.com.cn>>; Pioneer Li <pioneer...@blacksesame.com.cn<mailto:pioneer...@blacksesame.com.cn>>; Winston Zhang <winston.zh...@blacksesame.com.cn<mailto:winston.zh...@blacksesame.com.cn>>; Qun Gu <qun...@blacksesame.com<mailto:qun...@blacksesame.com>>; Elphel Sales | Olga Filippova <sa...@elphel.com<mailto:sa...@elphel.com>> 主题: Re: 答复: [Elphel-sup
Re: [Elphel-support] 答复: 答复: 答复: 答复: 答复: 答复: sync stereo with lidar
Hi Tao, As the camera relies on normal image processing for its operation, the easiest thing will be to disable most automatic functionality and use Python program to directly interface the FPGA, read data array. We will create instructions, but there will be no significant difference for your image processing algorithms as I explained in my reply to Allen. This mode is mostly for the testing of the camera itself, its FPGA and it does not improve 3-d reconstruction, there are other much more efficient ways to do that. Andrey On Tue, 27 Mar 2018 03:15:34 -0700 Tao Zhangtao.zh...@blacksesame.com.cn wrote Hi Andrey, We now can restore 12 bit as the method you described. But that 12 bit is lossy. We want lossless 12 bit or 10 bit data from camera to verify our algorithm. Can you help give that guide? Thanks Tao Zhang 章 涛 发件人: Allen Yin 发送时间: 2018年3月27日 16:34 收件人: Elphel Support support-list@support.elphel.com 抄送: Pioneer Li pioneer...@blacksesame.com.cn; Tao Zhang tao.zh...@blacksesame.com.cn; Qun Gu qun...@blacksesame.com; Winston Zhang winston.zh...@blacksesame.com.cn 主题: 答复: [Elphel-support] 答复: 答复: 答复: 答复: 答复: sync stereo with lidar Hi Andrey, Could we bypass the “gamma” module in the FPGA? We want the original raw data from sensor. Thanks, Allen Yin 发件人: Elphel Support support-list@support.elphel.com 发送时间: 2018年3月22日, 星期四 23:23 收件人: Allen Yin allen@blacksesame.com.cn; Elphel List support-list@support.elphel.com 抄送: Pioneer Li pioneer...@blacksesame.com.cn; Tao Zhang tao.zh...@blacksesame.com.cn; Qun Gu qun...@blacksesame.com; Winston Zhang winston.zh...@blacksesame.com.cn 主题: Re: [Elphel-support] 答复: 答复: 答复: 答复: 答复: sync stereo with lidar Allen, ~/.imagej/Eyesis_Correction.xml is not really needed - it just hides/reveals some experimental buttons on the interface This is the contents of such file: ?xml version="1.0" encoding="UTF-8"? !DOCTYPE properties SYSTEM "http://java.sun.com/dtd/properties.dtd"; properties commentlast updated Thu Sep 08 14:09:47 MDT 2016/comment entry key="ADVANCED_MODE"False/entry entry key="DCT_MODE"False/entry entry key="MODE_3D"False/entry /properties result.jpg looks correct. It should be super-contrast as it is linear, so it CAN NOT be saved as JPEG - it needs either 16 bits or 32 bit TIFF as when you save it from imageJ (save as tiff). And it is "monochrome" - each pixel corresponds to the sensor pixel value. For you application I would recommend to use just green subchannel (checkerboard pattern, half of all pixels) - in that case you do not need to have aberration correction. Your plots for gamma seem correct too, to be sure I need to look into the code again - I wrote that part several years ago. Gamma is not changed automatically in the camera, but you may change it using one of the interfaces - camvc of just parsedit. In addition to the power (0.57) there is another parameter - dark level - the sensor adjusts its ADC to have output level of 160 (on 4096 scale) or 10(256) for the complete darkness, so-called "fat zero". Gamma is applied inside the FPGA and parameters are saved in the Exif header, so for processing it is possible to "undo" gamma and restore linear scale. Andrey On Thu, 22 Mar 2018 00:58:53 -0700 Allen Yinallen@blacksesame.com.cn wrote Hi Andrey, There seems to be an another error, “2.jpg”. I have some doubts, could you please help me? 1. Does gamma value remain unchanged when camera works ? Who realize this gamma mapping, sensor or ISP? 2. When gamma0 = gamma1 = gamma2= gamma3 = 0.57, gamma_scale0 = gamma_scale1 = gamma_scale2 = gamma_scale3 = 1024, gamma mapping is Vout = a*Vin^gamma, a = 2.23 gamma = 0.57 , is it right? If not right, could you tell me the right? I use this gamma curve to convert the 12bit raw data, “result.jpg” is the result. ___ Support-list mailing list 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
Re: [Elphel-support] 答复: 答复: 答复: 答复: 答复: 答复: sync stereo with lidar
Hello Allen, Yes, it is possible to bypass gamma module in FPGA, but there is not much user software for this mode as while reducing frame rate twice (when doing in-camera processing) and even more if you'll try to send data over the network (you'll have to send 10 MB of data for each image instead of ~2MB for the almost lossless compression). So with GigE (~100MB/s) and even only 2 of 4 5MPix sensors you can even theoretically get 5 fps. And the noise reduction will be 30% at most. You see, image acquisition itself is _lossy_ by the laws of physics. If you have exactly the same scene, exactly the same illumination and acquire two image sets - they will be different, and the largest contributor for the modern high-quality sensors will be shot noise caused by the quantum nature of the light measurement by the sensor pixels and that there could be no 0.5 e- charge. So if the pixel full well capacity (number of electrons it can store) was 1 (it is actually less than 8 for 5 MPix), than for the bright scenes (say 9900 electrons in the pixel) it will vary +/-sqrt(1) = +/- 100 or 1% of the full scale. So there is just a probability, same scene can result in 1 or 9800 electrons (even vary more with less probability). There is not much sense to preserve each count, and say that pixel had exactly 9912 electrons if the uncertainty is +/-100 e-. It is like when there is polling over a limited (say 3000 people) and they say result percentage and a margin of error. So while it is possible to acquire data in 2-byte format bypassing the gamma, the gain is very small, but the loss in the bandwidth is high. Even for in-camera processing, because of the external memory bandwidth (and in 393 we use dedicated DDR memory chip for just the FPGA and utilize ~95% of the memory bandwidth) we still use gamma compression/decompression to increase the bandwidth. Andrey On Tue, 27 Mar 2018 01:34:18 -0700 Allen Yinallen@blacksesame.com.cn wrote Hi Andrey, Could we bypass the “gamma” module in the FPGA? We want the original raw data from sensor. Thanks, Allen Yin 发件人: Elphel Support support-list@support.elphel.com 发送时间: 2018年3月22日, 星期四 23:23 收件人: Allen Yin allen@blacksesame.com.cn; Elphel List support-list@support.elphel.com 抄送: Pioneer Li pioneer...@blacksesame.com.cn; Tao Zhang tao.zh...@blacksesame.com.cn; Qun Gu qun...@blacksesame.com; Winston Zhang winston.zh...@blacksesame.com.cn 主题: Re: [Elphel-support] 答复: 答复: 答复: 答复: 答复: sync stereo with lidar Allen, ~/.imagej/Eyesis_Correction.xml is not really needed - it just hides/reveals some experimental buttons on the interface This is the contents of such file: ?xml version="1.0" encoding="UTF-8"? !DOCTYPE properties SYSTEM "http://java.sun.com/dtd/properties.dtd"; properties commentlast updated Thu Sep 08 14:09:47 MDT 2016/comment entry key="ADVANCED_MODE"False/entry entry key="DCT_MODE"False/entry entry key="MODE_3D"False/entry /properties result.jpg looks correct. It should be super-contrast as it is linear, so it CAN NOT be saved as JPEG - it needs either 16 bits or 32 bit TIFF as when you save it from imageJ (save as tiff). And it is "monochrome" - each pixel corresponds to the sensor pixel value. For you application I would recommend to use just green subchannel (checkerboard pattern, half of all pixels) - in that case you do not need to have aberration correction. Your plots for gamma seem correct too, to be sure I need to look into the code again - I wrote that part several years ago. Gamma is not changed automatically in the camera, but you may change it using one of the interfaces - camvc of just parsedit. In addition to the power (0.57) there is another parameter - dark level - the sensor adjusts its ADC to have output level of 160 (on 4096 scale) or 10(256) for the complete darkness, so-called "fat zero". Gamma is applied inside the FPGA and parameters are saved in the Exif header, so for processing it is possible to "undo" gamma and restore linear scale. Andrey On Thu, 22 Mar 2018 00:58:53 -0700 Allen Yinallen@blacksesame.com.cn wrote Hi Andrey, There seems to be an another error, “2.jpg”. I have some doubts, could you please help me? 1. Does gamma value remain unchanged when camera works ? Who realize this gamma mapping, sensor or ISP? 2. When gamma0 = gamma1 = gamma2= gamma3 = 0.57, gamma_scale0 = gamma_scale1 = gamma_scale2 = gamma_scale3 = 1024, gamma mapping is Vout = a*Vin^gamma, a = 2.23 gamma = 0.57 , is it right? If not right, could you tell me the right? I use this gamma curve to convert the 12bit raw data, “result.jpg” is the result. ___ Support-list mailing list Support-list@supp
[Elphel-support] 答复: 答复: 答复: 答复: 答复: 答复: sync stereo with lidar
Hi Andrey, We now can restore 12 bit as the method you described. But that 12 bit is lossy. We want lossless 12 bit or 10 bit data from camera to verify our algorithm. Can you help give that guide? Thanks Tao Zhang 章 涛 发件人: Allen Yin 发送时间: 2018年3月27日 16:34 收件人: Elphel Support <support-list@support.elphel.com> 抄送: Pioneer Li <pioneer...@blacksesame.com.cn>; Tao Zhang <tao.zh...@blacksesame.com.cn>; Qun Gu <qun...@blacksesame.com>; Winston Zhang <winston.zh...@blacksesame.com.cn> 主题: 答复: [Elphel-support] 答复: 答复: 答复: 答复: 答复: sync stereo with lidar Hi Andrey, Could we bypass the “gamma” module in the FPGA? We want the original raw data from sensor. Thanks, Allen Yin 发件人: Elphel Support <support-list@support.elphel.com<mailto:support-list@support.elphel.com>> 发送时间: 2018年3月22日, 星期四 23:23 收件人: Allen Yin <allen@blacksesame.com.cn<mailto:allen@blacksesame.com.cn>>; Elphel List <support-list@support.elphel.com<mailto:support-list@support.elphel.com>> 抄送: Pioneer Li <pioneer...@blacksesame.com.cn<mailto:pioneer...@blacksesame.com.cn>>; Tao Zhang <tao.zh...@blacksesame.com.cn<mailto:tao.zh...@blacksesame.com.cn>>; Qun Gu <qun...@blacksesame.com<mailto:qun...@blacksesame.com>>; Winston Zhang <winston.zh...@blacksesame.com.cn<mailto:winston.zh...@blacksesame.com.cn>> 主题: Re: [Elphel-support] 答复: 答复: 答复: 答复: 答复: sync stereo with lidar Allen, ~/.imagej/Eyesis_Correction.xml is not really needed - it just hides/reveals some experimental buttons on the interface This is the contents of such file: http://java.sun.com/dtd/properties.dtd;> last updated Thu Sep 08 14:09:47 MDT 2016 False False False result.jpg looks correct. It should be super-contrast as it is linear, so it CAN NOT be saved as JPEG - it needs either 16 bits or 32 bit TIFF as when you save it from imageJ (save as tiff). And it is "monochrome" - each pixel corresponds to the sensor pixel value. For you application I would recommend to use just green subchannel (checkerboard pattern, half of all pixels) - in that case you do not need to have aberration correction. Your plots for gamma seem correct too, to be sure I need to look into the code again - I wrote that part several years ago. Gamma is not changed automatically in the camera, but you may change it using one of the interfaces - camvc of just parsedit. In addition to the power (0.57) there is another parameter - dark level - the sensor adjusts its ADC to have output level of 160 (on 4096 scale) or 10(256) for the complete darkness, so-called "fat zero". Gamma is applied inside the FPGA and parameters are saved in the Exif header, so for processing it is possible to "undo" gamma and restore linear scale. Andrey On Thu, 22 Mar 2018 00:58:53 -0700 Allen Yin<allen@blacksesame.com.cn<mailto:allen@blacksesame.com.cn>> wrote Hi Andrey, There seems to be an another error, “2.jpg”. I have some doubts, could you please help me? 1. Does gamma value remain unchanged when camera works ? Who realize this gamma mapping, sensor or ISP? 2. When gamma0 = gamma1 = gamma2= gamma3 = 0.57, gamma_scale0 = gamma_scale1 = gamma_scale2 = gamma_scale3 = 1024, gamma mapping is Vout = a*Vin^gamma, a = 2.23 gamma = 0.57 , is it right? If not right, could you tell me the right? I use this gamma curve to convert the 12bit raw data, “result.jpg” is the result. ___ 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: 答复: 答复: 答复: sync stereo with lidar
Hi Andrey, Could we bypass the “gamma” module in the FPGA? We want the original raw data from sensor. Thanks, Allen Yin 发件人: Elphel Support <support-list@support.elphel.com> 发送时间: 2018年3月22日, 星期四 23:23 收件人: Allen Yin <allen@blacksesame.com.cn>; Elphel List <support-list@support.elphel.com> 抄送: Pioneer Li <pioneer...@blacksesame.com.cn>; Tao Zhang <tao.zh...@blacksesame.com.cn>; Qun Gu <qun...@blacksesame.com>; Winston Zhang <winston.zh...@blacksesame.com.cn> 主题: Re: [Elphel-support] 答复: 答复: 答复: 答复: 答复: sync stereo with lidar Allen, ~/.imagej/Eyesis_Correction.xml is not really needed - it just hides/reveals some experimental buttons on the interface This is the contents of such file: http://java.sun.com/dtd/properties.dtd;> last updated Thu Sep 08 14:09:47 MDT 2016 False False False result.jpg looks correct. It should be super-contrast as it is linear, so it CAN NOT be saved as JPEG - it needs either 16 bits or 32 bit TIFF as when you save it from imageJ (save as tiff). And it is "monochrome" - each pixel corresponds to the sensor pixel value. For you application I would recommend to use just green subchannel (checkerboard pattern, half of all pixels) - in that case you do not need to have aberration correction. Your plots for gamma seem correct too, to be sure I need to look into the code again - I wrote that part several years ago. Gamma is not changed automatically in the camera, but you may change it using one of the interfaces - camvc of just parsedit. In addition to the power (0.57) there is another parameter - dark level - the sensor adjusts its ADC to have output level of 160 (on 4096 scale) or 10(256) for the complete darkness, so-called "fat zero". Gamma is applied inside the FPGA and parameters are saved in the Exif header, so for processing it is possible to "undo" gamma and restore linear scale. Andrey On Thu, 22 Mar 2018 00:58:53 -0700 Allen Yin<allen@blacksesame.com.cn<mailto:allen@blacksesame.com.cn>> wrote Hi Andrey, There seems to be an another error, “2.jpg”. I have some doubts, could you please help me? 1. Does gamma value remain unchanged when camera works ? Who realize this gamma mapping, sensor or ISP? 2. When gamma0 = gamma1 = gamma2= gamma3 = 0.57, gamma_scale0 = gamma_scale1 = gamma_scale2 = gamma_scale3 = 1024, gamma mapping is Vout = a*Vin^gamma, a = 2.23 gamma = 0.57 , is it right? If not right, could you tell me the right? I use this gamma curve to convert the 12bit raw data, “result.jpg” is the result. ___ 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: 答复: 答复: 答复: sync stereo with lidar
Hello Allen,
What exactly problems do you have with ImageJ? The code you need is in one
file, here is the method
https://git.elphel.com/Elphel/imagej-elphel/blob/master/src/main/java/JP46_Reader_camera.java#L415
You see, there are several programs to convert JP4 (Google created their own
that we do not have access to), and ourselves we use the ImageJ version, so it
is the most current. Over the years we added more data to Exif (mostly to
MakerNote field), and the ImageJ version opens current as well as older
versions (conditions like if (MakerNote.length=14) {...)
Boolean COMPOSITE marks composite frames as in Eyesis4pi - the single image
contains 3 vertically merged individual images).
I would still recommend to install ImageJ (we can try to help with specific
problems), and then use it as a reference for you code.
Andrey
On Fri, 09 Mar 2018 00:54:11 -0800 Allen Yin
allen@blacksesame.com.cn wrote
Hi Andrey,
If I want to get gamma conversion parameters from EXIF data , can I use
“identify” command in Linux? Or I can only use ImageJ plugin.
I try to use ImageJ and plugin, it’s difficult to setup the environment.
Attached is EXIF data get by “identify”, how to get the gamma value?
Thanks,
Allen Yin
发件人: Elphel Support support-list@support.elphel.com
发送时间: 2018年3月8日, 星期四 10:37
收件人: Winston Zhang winston.zh...@blacksesame.com.cn
抄送: Elphel Sales | Olga Filippova sa...@elphel.com; Tao Zhang
tao.zh...@blacksesame.com.cn; Qun Gu qun...@blacksesame.com;
Pioneer Li pioneer...@blacksesame.com.cn; Allen Yin
allen@blacksesame.com.cn
主题: Re: 答复: 答复: [Elphel-support] 答复: 答复: 答复: sync stereo with lidar
Hello Winston,
Tomorrow Oleg will try to reproduce your settings - so far we did not have
such problems.
BTW, you can set same parameters on multiple ports simultaneously, using
"Broadcast Mask" (hex number 0..f)
Port 0: 1
port 1 - 2
port 2 - 4
port 3 - 8,
So broadcast mask 3 will set the same mode on ports 0 and 1.
About bits I tried to explain in the previous messages and the "How many
bits..." in the article.
Sensor provides 12 bits, and each bit is important in the shadows. But not in
the bright light because of the shot noise that is caused just by the fact that
each pixel can store only integer number of electrons. And so while all bits
are important, there are not 4096 meaningful levels for each pixel, but
significantly less (see "How many bits..."). Gamma conversion uses non-linear
scale to represent pixel values with steps proportional to the shot noise
(steps are smaller). The gamma conversion parameters are saved in the Exif
header of the JP4 file, and if you open files with ImageJ plugin, it takes care
of the Exif data and restores linear data proportional to the pixel raw values,
then you can save it as 32-bit Tiff file.
Andrey
Hi, Andrey
I met a new question. I set ‘Color’ parameter with the five(it could get
the jp4 format image)on one camera, and this camera image format was converted.
But when I set the other one, this camera image format was not converted.
Please help me test for it.
Another question
What is the raw jp4 format image with 100% compression bit wide? I read
it and the result show the bit wide is uint8. But you web shows that the bit
wide is 12bit.
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
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