SDXI

How SD-X Works

SD-X uses a proprietary marking system. This marking system is nearly invisible to the naked eye and can be used on any printed material, as well as other surfaces. The SD-X two-dimensional isotropic marking system is analogous to bar code marking systems. While a one-dimensional bar code must be scanned in a linear fashion across its length and in a particular orientation, SD-X marks can be recognized from virtually any angle when an SD-X reader is pointed at them.

The marking system encodes “index” or “identity” values that can be detected and decoded by the optical recognition component of the SD-X reader. This optical recognition component is integrated in the SD-X reader with a computer. The computer receives in real time the index values recognized by the optical recognition system and makes them available to application software for processing.

In the standard SD-X reader, the optical recognition component is in the “top” of the reader, which looks like the writing end of a pen. The user applies the reader by touching the reader’s top to a surface encoded with the marking system to complete a recognition event. The SD-X reader responds to this event according to the currently active application program.

An SD-X reader can be programmed as a simple point-and-play device, rendering an audio response for each index code recognized. The reader also can be programmed to recognize specific combinations of codes to play Look and Find and other matching activities, ask questions and recognize correct and incorrect answers, calculate specific relationships between two or more touch points, render multiple languages, recognize patterns, play back user-created sequences, time activities, and score games and quizzes.