Re: [Elphel-support] Extension of stereobase and elongation sensor's cable length
We got a good results with 0x1ff80 value for MULTI_PHASE[n] in both channels without changing SENSOR_PHASE. I would measure the range around 0x1ff80 while the image is still good, then set the phase to the middle. For a 450mm cable the working range is ~60-100 steps. At first we get a broken images at same manner. By the way, if we use 450 mm cable with MULTI_PHASE = 0x1ff80 we get same problem, so MULTI_PHASE is strongly depends on cable length. Yes - signal propagation delay. If the experiment will give us a good results we intend to expand a stereobase for second setup at the same manner. In with case we will order to you addition cables. Do you offer now a sensor board (compatible with our 10359) with monochrome sensor? If so what type of sensor installed into such board? We do have some monochrome sensor boards. You can buy them but using a monochrome sensor reduces overall resolution of the sensor+lens combination. And most of nowadays the applications deal with color sensors. So, you can: a. Keep using a color sensor - just work with R, G and B channels separately, then combine. b. Get a monochrome sensor - but use a green color band filter in front of the lens to a have better resolution. 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] Extension of stereobase and elongation sensor's cable length
Forgot to send a copy back to the mailing-list: I found that next values are: SENSOR_PHASE - 0x9 MULTI_PHASE1 - 0x100b0. 1. I don't know. With SENSOR_PHASE unchanged try several points within each quarter for MULTI_PHASE1, e.g.: 0x8ff70, 0x8, 0x80070, 0x9ff70, ... 0xaff70, ... 0xbff70, 0xb, 0xb0070. Sometimes a phase shifter (digital clock manager in the fpga) can get stuck - so it's safer to set 15th bit to 1 to reset it. You can try with a 450mm cable if the long one can be easily disassembled. 2. How exactly do you connect 2 cables? picture? Any difference in the voltage levels on the ends between 450mm and 900mm setups? 3. If both images are broken in the same manner then try to change the SENSOR_PHASE. 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] Extension of stereobase and elongation sensor's cable length
17.04.2015 0:05, Oleg пишет: We do have some monochrome sensor boards. You can buy them but using a monochrome sensor reduces overall resolution of the sensor+lens combination. And most of nowadays the applications deal with color sensors. So, you can: a. Keep using a color sensor - just work with R, G and B channels separately, then combine. b. Get a monochrome sensor - but use a green color band filter in front of the lens to a have better resolution. I am not familiar with sensor's details but I know that in color sensor actual resolution for every color channel is lower than resolution provided in specification. For example if we consider color sensor 200 x 200 px then actual resolution for Red and Blue channel is 100 x 100 because of Bayer filter. Final image resolution 200 x 200 is obtained by interpolation. Most of mine applications are based on stereovision and processing of monochrome images. As you know most of the modern stereo-matching techniques operate with grayscale images too. My another knowledge is that monochrome sensor has a much higher sensitivity than color one at the same resolution. That is why I guess that using the monochrome sensor let me obtain higher ratio of signal/noise at the same resolution than color sensor. What do you think about that? From the other hand you mentioned about reducing of overall resolution of the sensor+lens combination. Do you mean reason of light dispersion in the lenses? Actually we have done a lot of experiments to find out a acceptable quality of the lenses for 5PMx resolution. We use now high quality computar M0918FIC-MPlenses. These lenses gives the best results of the all we try but anyway I suppose these lenses do not utilize a full resolution of the sensor. I think so because images analysis shows that high contrast contour line appears at the images like smooth contour with several pixels width. At the same time at the half (about 1MP) resolution we obtain much more contrast contour. Best regards, Oleg Dzhimiev Electronics Engineer phone: +1 801 783 x124 Elphel, Inc. -- С уважением, Клещенков Анатолий. г. Ростов-на-Дону теп.: +7(863)275-95-05 e-mail: akt...@inbox.ru ___ Support-list mailing list Support-list@support.elphel.com http://support.elphel.com/mailman/listinfo/support-list_support.elphel.com
Re: [Elphel-support] Extension of stereobase and elongation sensor's cable length
Hello! Thank you for fast response! 16.04.2015 21:48, Oleg пишет: Hi, To do so we have connected two cables in serial, so we obtained total cable length 450mm + 450 mm = 900 mm between 359 board and each sensor board. There's no guarantee this length will work. We try use control page http://192.168.0.9/359/10359_controls.html but it is not clear which values I have to change. I'd need to test if it still works fine. A better way to adjust phases is this one: Go to: http://192.168.0.9/ Parameter Editor Check Unsafe View/Edit Current Or here's a link http://192.168.0.9/parsedit.php?title=Parameters+for+groups:+unsafe+CLK_FPGACLK_SENSORSENSOR_PHASEI2C_QPERIODI2C_BYTESMULTI_PHASE_SDRAMMULTI_PHASE1MULTI_PHASE2MULTI_PHASE3. The phases are changed with: SENSOR_PHASE - system board - MUX (in stereo setup) MULTI_PHASE1 - MUX - sensor 1 MULTI_PHASE2 - MUX - sensor 2 MULTI_PHASE3... bits[18:17] - 90 degree shift bits[15:0] - fine steps (with sign) 0xff01...0x00ff I found that next values are: SENSOR_PHASE - 0x9 MULTI_PHASE1 - 0x100b0. Which new values need I to try setup here? Best regards, Oleg Dzhimiev Electronics Engineer phone: +1 801 783 x124 Elphel, Inc. -- С уважением, Клещенков Анатолий. г. Ростов-на-Дону теп.: +7(863)275-95-05 e-mail: akt...@inbox.ru ___ Support-list mailing list Support-list@support.elphel.com http://support.elphel.com/mailman/listinfo/support-list_support.elphel.com
Re: [Elphel-support] Extension of stereobase and elongation sensor's cable length
Hi, To do so we have connected two cables in serial, so we obtained total cable length 450mm + 450 mm = 900 mm between 359 board and each sensor board. There's no guarantee this length will work. We try use control page http://192.168.0.9/359/10359_controls.html but it is not clear which values I have to change. I'd need to test if it still works fine. A better way to adjust phases is this one: Go to: http://192.168.0.9/ Parameter Editor Check Unsafe View/Edit Current Or here's a link http://192.168.0.9/parsedit.php?title=Parameters+for+groups:+unsafe+CLK_FPGACLK_SENSORSENSOR_PHASEI2C_QPERIODI2C_BYTESMULTI_PHASE_SDRAMMULTI_PHASE1MULTI_PHASE2MULTI_PHASE3 . The phases are changed with: SENSOR_PHASE - system board - MUX (in stereo setup) MULTI_PHASE1 - MUX - sensor 1 MULTI_PHASE2 - MUX - sensor 2 MULTI_PHASE3... bits[18:17] - 90 degree shift bits[15:0] - fine steps (with sign) 0xff01...0x00ff 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
