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structured light
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  • Forum Post: High speed camera for structured light applications?

    sfumato
    I recently purchased a pico v2 kit to experiment with a few structured light and compressive sensing applications. Can any suggest a high speed video camera for use in capturing images at or near to the 1000-2000hz. pattern rate of the projector? A high frame rate is more important to me than high...
    on May 24, 2010

  • Forum Post: Re: Contrast on Pico

    Pascal DLP
    Hello Karnik. First - you may not be doing anything wrong. However, I must ask if you reassigned the green LED to red? Only one LED can be used in the 1440 Hz structured light mode. You mention that you are setting the green LED for 33% PWM (intensity). However, the pictures that you attached are...
    on Aug 11, 2010

  • Forum Post: Re: Contrast on Pico

    Pascal DLP
    Abe, Sorry my answer wasn't of much help. If you could send me your setup I can try to reproduce it here. Then, maybe I can see what is going on. Best regards, Pascal
    on Aug 12, 2010

  • Forum Post: Re: DPP1505 Splash Screens

    Pascal DLP
    Steven, Welcome to the DLP&MEMS E2E forum. There is no provision for user-defined patterns except via the HDMI video input. However, there are internal patterns which are available for structured light applications. Please refer to the documens DLP® Pico Chipset v2 Programmer’s...
    on Oct 8, 2010

  • Forum Post: Re: Does the Pico Development Kit 1.0 has the function of Structured Light Pattern?

    Pascal DLP
    Hello Yongfeng. Welcome to the DLP E2E forum. No. The Pico Kit V1.0 does not have the Structured Light Pattern capability. This was added to the V2. I have sent you a friend request. Please respond if you would like to talk some more about this. Pascal
    on Jan 31, 2011

  • Forum Post: Re: Questions for Pico DLP Dev. Kit

    Pascal DLP
    Jian Gao, Welcome to the DLP & MEMS E2E forum. 1. Please contact the maker of the Pico Kit V2 optical module - Young Optics Incorporated (YOI) http://www.youngoptics.com . 2. The Pico Kit V2 only supports the internal stripe patterns shown in the manual, or input via the HDMI port. There...
    on Mar 14, 2011

  • Forum Post: Re: How to use PICO V2 through i2c

    Pascal DLP
    Ouman, I think that you may misunderstand the 1440 fps mode. The BeagleBoard should be producing 60 fps 24-bit color - only. This is what is being sent across the HDMI cable to the Pico Kit. The data for each pixel in the frame is 24 bits wide - 8-bits each for R G B. What the Pico Kit does in...
    on Mar 22, 2011

  • Forum Post: Re: Questions about dlpc100

    Pascal DLP
    Shibatani-san, Welcome to the DLP & MEMS E2E. It is important to distinguish between the PWM for LED current control, and the Duty Cycle of the RGB LEDs for color sequencing. The PWM for LED current control operates at a much higher frequency (I believe around 20 kHz) than the sequence periods...
    on Mar 22, 2011

  • Forum Post: Re: Pico 2 Connector

    Pascal DLP
    Alan, I can't recommend a specific video card - I really don't know much about them. For the Pico Kit you don't need anything fancy - the problem may be getting such a low resolution out of the newest cards. All the Pico Kit v2 can use is VGA 640x480 at 60 Hz frame rate. This is rather...
    on Mar 28, 2011

  • Forum Post: Re: External Pattern for structured light App

    Pascal DLP
    Jeffrey, Are you using the application report DLPA021: "Using the DLP Pico 2.0 Kit for Structured Light" ? (Go to http://ti.com/mems and click on 0.17 HVGA Chip Set, then look under "Applications Notes". The input must be 640x480@60Hz. The pattern will be cropped from the upper...
    on May 5, 2011

  • Forum Post: Re: External Pattern for structured light App

    Pascal DLP
    Jeffrey, All of the structured light modes for the Pico Kit v2 are described in the document DLPA021 - Using the DLP Pico 2.0 Kit for Structured Light Applications (available at: http://www.ti.com/litv/pdf/dlpa021). There is no "8 bit per color" structured light mode which produces white...
    on May 13, 2011

  • Forum Post: Re: External Pattern for structured light App

    Pascal DLP
    Jeffrey, Your summaries look accurate to me. The limitation of no white (rather than monochrome) 8-bit SL mode for the Pico Kit v2 is that of the chipset design - in the monochrome modes, only one LED can be active. We understand that this can be a limiting factor for the reasons you summarize - especially...
    on May 23, 2011

  • Forum Post: Re: External Pattern for structured light App

    Pascal DLP
    Jeffrey, This sounds reasonable to me. The only advice that I can offer is to try it. Let me know how it works. Best regards, Pascal
    on May 25, 2011

  • Forum Post: Re: internal patterns for structured light applications

    Pascal DLP
    Pragnya, Welcome to the DLP & MEMS E2E forum. There are documents which can be downloaded from http://ti.com/mems . Look for a box on the left "MEMS Devices". Click on "0.17 HVGA Chipset". Then, look for "Application Notes". Click on "Using the DLP Pico...
    on Jul 5, 2011

  • Forum Post: Vertical sync for DLP Pico kit

    James Milch
    I am trying to implement a structure light application with the Pico kit (0.17 inch). My camera does not have a convenient external sync, but it puts out a sync pulse. Can I connect this pulse (with suitable polarity and shaping) to the vertical sync input on the logic chip, to synchonize the frames...
    on Jul 10, 2011

  • Forum Post: Re: DLP Pico Projector Refresh mechnaism - flicker seen through high speed camera

    Pascal DLP
    David, For the Pico Kit v2 (DLP1700 chip set) there are two Structured Light modes: 1) External Pattern 2) Internal Pattern. For the External Pattern modes, see section 3 of the Application Report (Using the DLP Pico 2.0 Kit for Structured Light Applications). The External Pattern mode receives external...
    on Jul 18, 2011

  • Forum Post: Re: display latency on pico projector

    Pascal DLP
    James, Welcome to the DLP E2E forum. You are correct - this information is not in the DLPC100 data sheet. The closest of your descriptions is #2. The delay is approximately 1.5 frame periods after the VSYNC at the end of the incoming video frame. I can not give you an exact number - that would...
    on Jul 18, 2011

  • Forum Post: Re: How to encode AVI for 1440 fps.

    Pascal DLP
    Hello Gavin, You have it close. Do you have the App Note: "Using the DLP Pico 2.0 Kit for Structured Light Applications" ? You can download it by going to http://ti.com/mems and following the link under "MEMS Devices" "DLP Technology" "0.17 HVGA Chipset" "Applications...
    on Jul 20, 2011

  • Forum Post: Re: How to encode 1440 monochrome video for Pico 2.

    Pascal DLP
    Gavin, Perhaps someone in the Pico Kit user community has already accomplished this. If so, I hope that they will offer some of their experience. Best regards, Pascal
    on Jul 22, 2011

  • Forum Post: Phase-shifted patterns on a Pico2 (via Arduino)?

    sj3n
    I see in the documentation (dlpa021.pdf) that there are Gray codes embedded in the projector. Are these patterns in the DLPC100 controller, or in the DLPR100 ROM? Long-story-short: I've had a lot of success doing phase-shift imaging (sinusoid) via the HDMI connector (via Mac laptop) but am hoping...
    on Jul 22, 2011

  • Forum Post: Re: Phase-shifted patterns on a Pico2 (via Arduino)?

    Pascal DLP
    sj3n, In the 0.17 HVGA chipset (used in the Pico Kit v2), the built-in Gray code patterns are not accessible for modification by the user. There is no provision in this chipset for user generated stored patterns. As you say, a pattern generator can be used to drive the Pico Kit v2 through the HDMI...
    on Jul 22, 2011

  • Forum Post: Re: How to encode 1440 monochrome video for Pico 2.

    Pascal DLP
    sj3n, Thanks for the references to Processing and ImageJ. I was not familiar with Processing. I will be taking a look at it. Best regards, Pascal
    on Jul 22, 2011

  • Forum Post: Re: How to encode 1440 monochrome video for Pico 2.

    Pascal DLP
    Gavin, I would be interested in seeing the constructed animation. I can't promise an official evaluation, but I would like to see it. Best regards, Pascal
    on Jul 25, 2011

  • Forum Post: Re: How to encode 1440 monochrome video for Pico 2.

    Pascal DLP
    Gavin, You have been busy! I will not get a chance to look further at this until sometime next week. I can't promise. Maybe someone else on the forum will pick it up and try it. There is a problem, though. First, you have created a single frame. In order to stream this to the Pico Kit v2...
    on Jul 29, 2011

  • Forum Post: Re: How to encode 1440 monochrome video for Pico 2.

    Pascal DLP
    Gavin, I tried it. It works! I see exactly what you described - a small box which spirals into the screen 10 times in a row - each 1 second in duration. Running at 1440 fps monochrome. I would be interested in seeing the "more exciting" movie. Best regards, Pascal
    on Aug 2, 2011
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