Can LightCommander projects color pattern in Structure Light Mode ?

Hi Weihua,

LightCommander(TM) can project monochrome patterns in structured light mode and the possible monochrome colors are Red or Green or Blue or Cyan or Magenta or Yellow or white.

You have to configure in 'Video Mode' to get the color patterns. But it is not sutiable structured light mode as the input data goes through corrections (degamma and dithering).

Regards,

Sanjeev

Hi Sanjeev,

Thanks for your reply.

And there are still some questions I want to know. Can LightCommander project specified images repeatedly? What is its highest frame frequency in Structure Light Mode?

Best wishes!

Weihua

Weihua,

Yes. The DLP LightCommander can project the loaded set of 1-bit depth images at rates up to 5000 frames per second.

Best regards,

Pascal

One clarification - the patterns must be programmed into the C200 flash memory to achieve the 5000 frames per second. If you plan to use one of the external ports, the speed is limited to 1440 (60 Hz X 24 bits).

Regards,

Adam Kunzman
Keynote Photonics 

Thanks for your reply!

Sorry for my question being not very clear!

Is it feasible to project RGB component sequentially to generate a color pattern in Structure Light Mode for LightCommander Kit? Please tell me the swiching frequency of the LED. Is it accessible to customer to request a trial for this product? If yes, how to apply. In additon, please tell me the sale price, preferential policies of university, purchase channel in China.

Thank you!

Weihua

Hi Weihua,

LEDs switching depends on the LED Driver; the one used in LightCommander(TM) kit supports ON time as short as 5uSec. But with everything integrated (adding DMD in the system) the time increases, this is because as we know there is a time for loading data on the DMD. So practically on LightCommander the fastest is 1-bit 5000Hz.

Will you explain with somemore detail on your requirement for color pattern? Like pattern frequency and color loading order etc. Note for the strucutred light mode the pattern size is either 1-bit or 8-bit. Now for this duration the color is fixed. Or is your requirement is like this? Display 8-bit pattern with each bit shown in a different color?

Regards,

Sanjeev

Hi Sanjeev,

We are concentrating on 3D measure with color coding. So we want to know is it impossible to view a color pattern through projecting a series of monochrome patterns sequentially in structured light mode. See attached figure for more details.

Thank you!

Weihua

Hi Weihua,

I thought to provide you more options regarding design of FPGA. There are TI DLP recognized design houses who are known to be experts in customizing electronics and optics. I suggest you to have a look them, if any more clarifications needed you can send me friend request we can take if from there. Here is Design House list http://www.ti.com/analog/docs/memsdlpdsgn.tsp?sectionId=622&tabId=2448

Regards,

Sanjeev

Ok

Thank you very much for your information!

Regards,

Weihua

Dear Weihua,

Our X3-PM55 controller supports the architecture that Sanjeev outlined above though I'm not aware that we've implemented anything specifically along these lines. We can provide some detailed information if you are interested, just send Friend request and we'll follow-up.

- Adam

Hi

I am also interested in projecting multi colours, (in my case only 2 colours) at the same time as shown in the png file attached.
From what I understand it is impossible to project different colours at the same time.

I have tried switching rapidly between the red and blue LED using the API using the following algorithm, but find that it doesn't work well.

repeat{
enable LED_R
disable LED_B
writeImageOrder Red Pattern
display once

enable LED_B
disable LED_R
writeImageOrder Blue Pattern
display once
}

however, not sure if it is due to the switching times of the LED or the sequence of the algorithm, the red square appears blue for a while and vice versa.

Is there a better way to do it? 
How will using the X3-PM55 controller help?

Thanks for any help and advice.
 

Hi Sze Ping,

Internal to DLPC200 there is no direct way to select different LEDs per pattern. I would suggest to check directly with X3-PM55 manufacturer Keynote Photonics http://www.keynotephotonics.com/ for the same.

Regards,
Sanjeev

Dear Sze Ping,

Our X3 has two approaches that may solve this issue.

1) We provide an external FPGA (FL200) which can generate pattern data or apply preloaded patterns to Port2 of the DLPC200. The FL200 has set of PWM outputs that can be applied to any standard LED driver. The PWM levels can be adjusted in every step in our autostepper function.

2) An alternative method would accept the C200 sync output, which would trigger our FL200 autostepper. As before, the autostepper in the FL200 would be programmed to adjust the PWM levels. Once challenge with this method is to devise a method to coordinate both the C200 and FL200 steppers to start and reset together.

Please send me a private message and we can follow-up by direct e-mail.

Regards,

Adam