Mirror Image

Mostly AR and Stuff

Augmented Reality Tower Defense game is up for download

It’s here. In this demo I’ve used the same multimarker tracker I’ve used in last demos. 3d position of the camera calculated form markers used for placing tower. Third dimension used to control tower height
If you don’t know what Tower Defense is, here is wiki entry

15, November, 2008 Posted by | Augmented Reality, Mobile, Nokia N95, Symbian | , , , , , , , , , | Comments Off on Augmented Reality Tower Defense game is up for download

Marker based augmented reality on CNN

Net is buzzing about CNN hologram at election night. What this tech really is the augmented reality + 3D imaging technology. CNN had 35 cameras in a ring at Obama headquarter to capture Jessica Yellin image from any possible 2D direction, with angle delta small enough not to be noticeable. After correct frame was picked up it was inserted into main videoframe. It seems to me the red circle on the floor was used for positioning of the image, as fiduciary marker. If you pay attention to the last part of the video you can see that Jessica “float” a little over the circle. That is because the circle is not the best choice for the marker. Square is probably the best fiduciary marker possible. It have distinctive corner, which could have subpixel accuracy, because they calculated as intersection of linearized square sides, and it produce third dimension axis easily, as cross product of cross products its sides.

6, November, 2008 Posted by | Augmented Reality | , , , | Comments Off on Marker based augmented reality on CNN

Phone camera as 3d pointing device

Here is a short video how phone camera could be used as precise enough 3d pointer.
This demo use the same engine as my first demo.

3, November, 2008 Posted by | Augmented Reality, Coding AR, Mobile, Nokia N95 | , , , , , , | 2 Comments

Reception – first imppression

First reception of the demo is positive. It seems generally users have no problems with concepts of fiduciary markers and keeping them in the camera frame. Mostly people want more stuff and gameplay, as always, but seems there is no problem with usability. Well, of cause there is problem of Nokia platform fragmentation, but that is not exactly AR related. Well, it could be. Mobile AR applications are CPU hungry, and that force them to squeeze device hardware to its extreme. Which make AR apps especially vulnerable to platform fragmentation. I’ve already mentioned strange problem with N96 in previews post.
The concept of tabletop marker-based game seems viable.
The main question is, how to bring more real-world interaction into game ?
Right now we have phone as 3d mouse and small objects scanned and placed into game.
Make markers movable ? Wouldn’t it hinder gameplay ? Scan surface of the table and use it as game “terrain”, with game physics properties imported from real table surface/objects ?
Questions, questions…

23, October, 2008 Posted by | Coding AR | , , , , | Comments Off on Reception – first imppression