Sunday, June 14, 2009

This Blog Has Moved

This blogspot blog has been moved to my website:

PS3 m12 Lens Difference

Here are some comparison shots showing just how much better the PS3 camera is once you replace the OEM lens:

(Setup: Outside, midday)

Left: OEM__________Right: 3.6mm m12 Lens

OEM Lens

3.66mm m12 Lens

The perfect focus of the after-market lens is important when trying to get very accurate blobs in optical-based multitouch setups, and also when using fiducial patterns like those used by the Reactivision Team.
For finger tracking, the OEM lens can work fine, but should really only be used if on a tight budget, as the results from the more focused image will be better.
Here are some comparison shots using both lenses in a MT table:

(m12 lens)

(Comparison: OEM on left, m12 on right)
The reason why the OEM looks in focus is because the camera is only a few inches from the hand. Once you move away from it more, the image will go out of focus quickly, thus setups with the camera more than a few inches away won't be in focus.

(OEM lens)

(3.66mm m12 lens)

(2.1mm m12 lens - Fisheye/Wide Angle)

(OEM lens)

(m12 lens)

So as you can see, the screen shots support what I said before. The OEM lens can work for either really short camera distances, or for finger tracking systems that dont need high accuracy.

My store carries both m12 and OEM moddified cameras, so be sure to check it out and let me know if you have any questions.

Saturday, June 13, 2009

ACRYLITE Rear Projection Material Comparison

So I tested the ACRYLITE RP materials that are offered by Evonik (Germany) for Rear Projection acrylic screens.
My favorite is the 7D006, but since it is hard to get if you live outside of Europe, of the other materials, which are domestic USA mainly, the dark grey had the best and closest image quality to the 7D006.

Tested Materials:
7D006 - grey (Used in the Microsoft Surface Tables)
0D002 - colorless
7D512 - light grey
7D513 - dark grey

Projector: 2500 lumens
Ambient Light: Medium