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Video support (either from the PC or from the built-in memory)

Fahri Yaras
Prodigy 115 points

 

I would like to ask about the video support of the Light Commander. If we connect the LC to the PC by a HDMI cable, isn't it limited by the graphics card of the computer? I mean, the maximum fps will be limited by the graphics cars, am I correct? If so, how can we use the LC at the highest speed when we want to display video?

Thank you,

  • 0
    TI__Guru 54705 points

    Welcome Fahri to the DLP section of the TI-E2E Community.

    In the case of the LC(LightCommander) video fps it is limited by the LC which is only capable of 1024 x 768 RGB @ from 6 - 60 fps.

    The higher speeds are for binary patterns or grayscale patterns in "Structured Light mode"  In these modes you can specify the "frame rate".

     

    Fizix.

  • 0 in reply to Fizix
    Prodigy 115 points

     

    Thank you for the fast reply. So, if there is a easy way to upload all images to the LC. I can divide the video into frames and upload them into the system. However it takes to much time.

    Regards,

    Fahri

  • 0 in reply to Fahri Yaras
    TI__Mastermind 30875 points

    Hi Fahri,

    The video mode in the LC is 'very basic' and the purpose is to demonstrate you can do the video RGB888 @60Hz (can be b/w 6 to 60Hz). The LC is most useful in structured light kind of applications. The dowloading of images is applicable for structured light mode only. It is not possible to simulate real time video kind of environment by downloading frames and displaying.

    What are your requirements for video source input?

    Regards,

    Sanjeev

  • 0 in reply to Sanjeev
    Prodigy 115 points

    Hi Sanjeev,

    Ok, I understand the video input part. My other question was easier way of adding patterns to LC. In the program, I can add the images by "right click" and choosing "add pattern". However it takes too much time if you add 100 images. Is there an easy way of to do that? ( I am not familiar with API.)

  • 0 in reply to Fahri Yaras
    Prodigy 115 points

     

    I would like to ask another question to clarify better.

    When we choose the "Structured Light Field" mode we can drive it by DVI. I think we will connect it the PC, am I understood correctly? So what will be the input? Will it be a video that plays in the PC, or sth else?

    There is also an option in the program, just under the Frame Rate, called "Patterns/Frame". It says: "Patterns/Frame parameter indicates how the structured light patterns are encoded on the input port data bus." What does that mean? For example, for Structured Light Mode what does it mean if "Patterns/Frame" equals to 24? Thank you,

    Fahri

  • 0 in reply to Fahri Yaras
    TI__Mastermind 30875 points

    Hi Fahri,

    On your two questions -

    1)

    Hi Sanjeev,

    Ok, I understand the video input part. My other question was easier way of adding patterns to LC. In the program, I can add the images by "right click" and choosing "add pattern". However it takes too much time if you add 100 images. Is there an easy way of to do that? ( I am not familiar with API.)

    [Sanjeev] The patterns/images goes through format conversion before loading into the LC. When you do this using GUI; the tool automatically formats and then transfers to the LC. Using API will be faste than GUI but it expects a 'formatted' data so to use API you would require to implement  format conversion in your application. The procedure for formatting is discussed in this link http://e2e.ti.com/support/dlp__mems_micro-electro-mechanical_systems/f/387/t/113085.aspx

    2)

    I would like to ask another question to clarify better.

    When we choose the "Structured Light Field" mode we can drive it by DVI. I think we will connect it the PC, am I understood correctly? So what will be the input? Will it be a video that plays in the PC, or sth else?

    There is also an option in the program, just under the Frame Rate, called "Patterns/Frame". It says: "Patterns/Frame parameter indicates how the structured light patterns are encoded on the input port data bus." What does that mean? For example, for Structured Light Mode what does it mean if "Patterns/Frame" equals to 24? Thank you,

    Fahri

    [Sanjeev] Your understanding is corret. Structure Light mode via DVI port - You can display maximum of 24 1bpp (one-bitp-per-pixel) patterns or 3 (8bpp eight bits-per-pixel)  patterns. If your input is XGA @ 60Hz the LC commander will display the patterns based on confgiruration done via GUI.

    CONFIG-1:  If it is 1bpp solution then it divides every incoming frame into 24 subframes and displays them.

    CONFIG-2:  If it is 8bpp solution then it divides every incoming frame into 3 subframes and displays them.

    Regards,

    Sanjeev

     

  • 0 in reply to Sanjeev
    Prodigy 130 points

    HI

    I have a basic question here regarding DVI in structured light mode.
    How do I send my patterns using DVI?

    Any help is appreciated.

    Regards
    Sze Ping 

  • 0 in reply to Sze Ping Beh
    TI__Mastermind 30875 points

    Hi Sze,

    You should be able to drive it like any other monitor from a standard graphics card. You can generate 1024x768 resolution 24bpp image and put it on LightCommander(TM) which will be detected as secondary monitor. Also make sure the frame-rate is same as what is configured on LightCommander, normally the kit accepts 6Hz to 60Hz input.

    Normally some graphics card have degmman, brightness, and contrast adjustments note for this case everything should be disabled or passthrough, the data should go as it is.

    Regards,
    Sanjeev