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Supplying external 1-bit monochrome patterns via HDMI

Gabriel Rosenhouse
Prodigy 70 points

Hello,

I'd like to display external 1-bit monochrome patterns with the LightCrafter at the maximum frame rate (24 * 60 Hz = 1440 Hz) and supply the "patterns" via HDMI.  I don't care about the LEDs, since I will be using an external light source.

1) Is this possible? 

2) If yes, can I get that by setting sending the TCP/IP command for  "Video Mode Setting (0x02 0x01)"? 

3) On page 28 of the LightCrafter users's guide it says  "where this image enhancement is not desired, the video processing algorithms can be bypassed and replaced with a specific set of bit planes."  How do I do that?  I just want raw 1-bit images very fast, nothing else.

Thank you for your time!

-Gabriel

  • 0
    TI__Mastermind 30875 points

    Hi Gabriel,

    Welcome to DLP & MEMS forum.

    Response to your questions.

    (1) Yes.

    (2) You need to call additional TCP/IP commands.

    Here's the sequence -

    Step-1)  Set Video Input Setting (02 00)  

    step -2) Set Video Mode Setting (02 01), Select 60Hz, Bite Depth = 1,  and then select Byte 2 = Monochrome Display

    Step-3) Change Current Display Mode (01 01) - HDMI Video Input

    (3) You don't need manual step of disabling the image processing algorithms. The Step(2) (as explained above) setting will take care. Basically in the step-2 when you mention Byte2 = Monochorme the DM365 automatically configures DLPC300 by sending algorithm processing disable commands.

    Regards,

    Sanjeev

     

  • 0 in reply to Sanjeev
    Prodigy 70 points

    Thank you Sanjeev for the quick response.

    I'm currently troubleshooting the USB/RNDIS stuff (I've got it working sporadically on 1 computer, but not at all on another).  I will post an update once I've gotten to the point where I can reliably open a TCP/IP socket to the device.

  • 0 in reply to Sanjeev
    Prodigy 120 points

    Dear Sanjeev,

    Can this be done through the GUI? You can select a bit depth of 1 in HDMI input mode, but does it realize that this should be a monochrome display? When I look at the power spectrum of the HDMI display in 1 bit depth mode I see many high frequency peaks I'm associating with the image processing algorithms. When I use a 1 bit pattern sequence, the images displayed lack these high frequency peaks, so the image processing algorithms are disabled in this mode.

    Daniel

  • 0 in reply to Daniel Hochbaum
    Prodigy 70 points

    Daniel, I'm curious how you're gathering this data, because I may want to do a similar diagnostic...Are you using a high speed camera to capture the projected image, or are you looking at some electrical signal on the board?

    Thanks...

  • 0 in reply to Gabriel Rosenhouse
    Prodigy 120 points

    I'm using a high speed camera. My setup is as follows: I removed the light engine and am using an external laser source for illumination. I am imaging the DMD onto a fluorescence microscope sample plane. For diagnostics, I use a fluorescence bead sample, whose emission I am capturing on a CCD at ~1khz for 10000s of frames. I analyze the image by taking power spectra over illuminated areas in my movies. I've isolated the noise to the DMD, I saw similar power spectra when working with the pico projector. I could remove those high frequency peaks by talking to the pico through I2C and turning off all the spatio-temporal dithering.

    Daniel

  • 0 in reply to Daniel Hochbaum
    TI__Mastermind 30875 points

    Hi Daneil,

    Answers to your questions.

    Can this be done through the GUI? [Sanjeev] YES

    You can select a bit depth of 1 in HDMI input mode, but does it realize that this should be a monochrome display? [Sanjeev] If you select bit depth < 8 it always gets into mono-chrome display with image processing algos turned off. If bit depth = 8 AND RGB check-box unchecked then also DM365 will disable image processing algorithm. The default HMDI Video setting is 8 bit depth and RGB checkbox selected only this configuration the image processing algorithm in the DLPC300 will be kept active by DM365.

    When I look at the power spectrum of the HDMI display in 1 bit depth mode I see many high frequency peaks I'm associating with the image processing algorithms. When I use a 1 bit pattern sequence, the images displayed lack these high frequency peaks, so the image processing algorithms are disabled in this mode. [Sanjeev] Is this information sharing or do you have any question let me know.

    Regards,

    Sanjeev

     

     

  • 0 in reply to Daniel Hochbaum
    Prodigy 70 points

    Thanks Daniel.  I was considering doing something similar with a linear photodiode array in order to sample (a line from) the image at a higher rate than the DMD updates, and verify that it was operating how I expect.

  • 0 in reply to Sanjeev
    Prodigy 110 points

    Hi Sanjeev,

    I’m also trying displaying 1 bit depth monochrome images at 24*60 = 1440Hz, I have a video stream of 720*480@60Hz 24bit/pixel feeding into the mini HDMI port on the LightCrafter, I tried several settings but failed, can you tell me how to set the GUI to achieve that? And is there frame resolution limitation for this option?

    Thanks,

    Hai