designing and implementing a method for locating and presenting a laser pointer spot eran korkidi...
TRANSCRIPT
Designing and
implementing a method for
locating and presenting a
Laser pointer spot
Eran Korkidi
Gil-Ad Ben-Or
IntroductionIntroductionThe project presented here describes an alternative method for controlling a mouse using a laser pointer when showing a presentation.
Locating and presenting the spot of a laser pointer on a projection screen can be useful for many applications, for example:
The purpose of the projectThe purpose of the project
Enhancing laser pointer appearance on screen.
By presenting the laser point via the computer, we can sketch contours on the projection.
Replacement Interface for a Wireless Mouse.
Our solutionOur solution
Detecting the red spot of the laser pointer is done
by a camera.
The camera is directed to the projection screen,
and calibrated according to the specifications of
the relevant projected area, focus and zoom.
After The camera locates the laser spot on the
screen, the program updates the pointer state,
taking into consideration the location of the spotted
point and presents it via the projector.
Our solutionOur solution
AlgorithmAlgorithm
Find the brightest area on the screen. Average positions of all bright points on the
screen to extract pointer location. Transform the resulting coordinates to screen
coordinates. Update pointer position.
Experiments and resultsExperiments and resultsFirst experiments were made with a adjacent frame difference
approach. The results show that with the equipment we used,
there is a need for another level of filtering.
Improving the solutionImproving the solution
Problem: Finding a small spot on the screen is
problematic due to high rates of noise.
Solution: Use an infrared camera and laser
pointer let us “see” only the laser pointer and
ignore background noise.
Experiments and resultsExperiments and results
Experiments and resultsExperiments and results
IR experiments:
The following
picture introduce
our interface and
was taken by an
IR camera
Improving the solutionImproving the solution
Recommended Further work Recommended Further work
Implementation of kalman filter for contour
estimation, thus inhibiting any unwelcome
disturbance or noise.
Full Interface interaction with the mouse cursor
while lecturing with a presentation.
Support a wider range of cameras, using less
expensive cameras.
Conclusion Conclusion
Our goal in this project was to design a system that
locates a laser spot and presents it via projector.
The solution described here answer the problem that
presented above.
Future work is needed to implement better IR system
and Additive Kalman Filter.