|VISUAL INPUT FOR PEN-BASED COMPUTERS||Student: Mario E. Munich
Faculty: Pietro Perona
Support: NSF, NYI, ONR
MOTIVATION & AIMS:
Computers are getting faster and smaller every day. Many products, notebook
and laptop personal computers, pen-based computers and personal organizers,
are designed to be as small (`portable') as
Audio and visual interfaces present two big advantages. First they can
be implemented as very small devices with the current VLSI technology.
Second, in some circumstances, they will allow the design
The new input system consists of a camera, a piece of paper and a pen.
The camera, pointed at the sheet of paper, images the handwriting and the
trajectory of the pen is tracked so that the
DESCRIPTION OF THE SYSTEM
We use computer vision techniques and estimation theory to track the
position of the pen tip in the image plane [1,2,3].
The system was implemented on a Pentium platform equipped with a Texas
Instruments C80 DSP board. We achieved real-time, processing 30 frames
per second. The following figure shows a user writing on a piece of whiter
paper. The user wrote the word "mario", that is displayed on the monitor
of the computer.
In the following figures we show several handwriting sequences acquired
in real-time with our system.
We have developed a new way of input data for computers. The system works in real-time (30 Hz) and is able to track the position of the pen tip while a user is writing. The system is able to detect when the pen is up and not writing. The recovered handwriting path provides enough spatio-temporal for performing handwriting recognition.
 M. E. Munich and P. Perona, "Visual Input for Pen-Based Computers", CNS Technical Report CNS-TR-95-01, California Institute of Technology, 1995.
 M. E. Munich and P. Perona, "Visual Input for Pen-Based Computers", in Proceedings of the 13th International Conference on Pattern Recognition, Vienna, August 1996.
 M. E. Munich and P. Perona, "Visual Input for Pen-Based Computers", in Proceedings of the 3rd International Conference on Image Processing, Lausanne, September 1996.