Analog pallet correction

[infredible]

DZ's board is nice for fixing all the time delay problem but isn't really suitable to cure brightness and gamma issues.

Fred.

DZ are still selling the color board?

[mixedgas]

DZ's board is nice for fixing all the time delay problem but isn't really suitable to cure brightness and gamma issues.

Fred.

OK, the only analog tricks I have in real time are:
Clip
Square
Log
Antilog
Breakpoint
Multiply
Add
Threshold
compare.

Or mixes of the above

Of course if we do a look up table in eeprom..

Steve

[DanBarlow]

If it isn't stepping on anyone's toes, I could look into doing a digital gamma corrector/lookup table/pallette animator thing. There's a processor+DSP board called HawkBoard that sells for $80 or so and has more than enough horsepower. I got an eval version.
It has USB and Ethernet so you could adjust it from a laptop, and it'd be pretty easy to hook up a photo-diode and let it self-calibrate each beam color gamma. Version 1 would just be a gamma correction, no real time calibration or time delay, but those are possible.

I'd need a list of desired features... thinking it would start with ILDA connectors to plug between the controller and projector, calibration sensor(s?), bypass switch... what else?

-Dan Barlow

[flecom]

This is exactly what I'm talking about
I sent them an email to inquire pricing... I wonder how much loss do you get with that little sensor mirror/window.

Fred.

I was talking to Fred @ one stop laser shop they installed one of these in a projector and had something like a 30% insertion loss

[heroic]

If it isn't stepping on anyone's toes, I could look into doing a digital gamma corrector/lookup table/pallette animator thing. There's a processor+DSP board called HawkBoard that sells for $80 or so and has more than enough horsepower. I got an eval version.
It has USB and Ethernet so you could adjust it from a laptop, and it'd be pretty easy to hook up a photo-diode and let it self-calibrate each beam color gamma. Version 1 would just be a gamma correction, no real time calibration or time delay, but those are possible.

Given the thermal lensing problem, it's not going to work without realtime feedback sensing.

[Robin]

There is an excellent article on Pangolin's site regarding this issue:

http://www.pangolin.com/resguide03d.htm

In addition to illustrating several circuit schematics, it traces the roots of the issue through a quick history of laser projection technology.

[polishedball]

There is an excellent article on Pangolin's site regarding this issue:

http://www.pangolin.com/resguide03d.htm

In addition to illustrating several circuit schematics, it traces the roots of the issue through a quick history of laser projection technology.

Isn;t that the same circuit DZ used>?

[DZ]

Isn;t that the same circuit DZ used>?

Hey polishedball, the color board is a bit of a hybrid, it uses features from the simple Sallen Key filter and the Ready for anything circuit, along with a few things I threw in. If I remember correctly, you got one of these from Stanwax, if you look at the bottom you should see a message giving credit to pangolin.com for the assistance with the design.

[polishedball]

Hey polishedball, the color board is a bit of a hybrid, it uses features from the simple Sallen Key filter and the Ready for anything circuit, along with a few things I threw in. If I remember correctly, you got one of these from Stanwax, if you look at the bottom you should see a message giving credit to pangolin.com for the assistance with the design.

Yep saw that on the back, just got this setup quickly tonight. Gave about an hour to it and all I can say is WOW F' Ya.
I can't see how anyone could have a solid state projector without one!
Color Pallet improved, all the stripes fit in the flag! things are white to start not shifting color or fading out to all red.

This thing is the greatest. Only problem is I run multiple DACs so I need to get another to integrate inline for it as there is a huge improvement on the second dac going through the Color Corrector setup that was corrected for the QM2000, but thinking I can improve it a bit with another inline prior to the one in the projector.

[kecked]

All I can say is MAKE ANOTHER RUN ALREADY.