Coretec Group Inc (CRTG)

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Newly Published: "Multi-Layer Overlay Display" was a paper written by Dr. Refai and presented at the SPIE Conference for Display Technologies and Applications for Defense, Security, and Avionics V last month.

The paper details an additional capability of CSPACE that we had not learned before (that I can recall), which is to generate three dimensional images from a series of two dimensional images -- an overlay approach. The unique properties of the display permit flexibility in generating overlaid images and tailoring the image construction to a particular application. The display allows flexibility in the number of overlay layers, thickness of individual layers, and color control of the layers without changes to the display configuration and with minimal impact on the quality of the generated image.

Some additional highlights are:

1) Displays using the overlay approach "are suitable for rendering both 2D and 3D content, including gaming, digital signage, and are particularly suitable for displaying information on mobile devices and computer displays where the physical depth of the display is a limitation for other approaches, and the inability to view the image from all directions in not a limitation."

2) The paper goes on to show example of overlaying images and provides photos. Unfortunately, given the photos are 2D and we are viewing them on a 2D display (your computer screen), I don't think the photos are as "cool" as we would hope if were actually seeing them in person in 3D.

3) The first example used in the paper is a road map of Yellowstone National Park. Two simple geometric images are placed over the road map -- a circle and a square. See photo below and bear in mind these are on different layers, so you really cannot see the "3Dness" of it given we're viewing it in 2D. If you were there in person, I imagine you would be able to actually see the different layers (or elevations).



4) The second example are individual planes and clouds. See photos below. Again, only 2D photos. These are then combined with the map (see next image below).



5) And finally the road map, planes, and clouds are all combined in a composite image. See photo below. Again, only a 2D photo, so hard to discern the different layers.



6) More than 3 layers can easily be used by activating more columns of mirrors in the DMD.

The paper notes that the photos are all in the green color which makes them difficult to discern too. It suggests that having different colors would make it easier to view and suggests how it would be done. Why there are not any photos showing the different colors, I cannot say. My understanding is they did achieve using different colors, but we have yet to see an image of multiple colors being used at the same time.

Again, if you're interested in downloading the entire paper, you can go to: http://spie.org/app/sitesearch/index.cfm?searchtext=3dicon§ion=publications