Carlos Vidales

October 19, 2010

Carlos VidalesOctober 19, 2010

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Carlos Vidales, "How to Calibrate Touch Screens" (Embedded Systems Programming magazine, June 2002).

Touch screens are finding their way into a variety of embedded products. Most touch-enabled devices will require a calibration routine. Here's a good one.

The program sample provided at 06vidales.zip includes three files: calibrate.c, calibrate.h, and sample.c. The hard work is done in the first. It contains two functions called setCalibrationMatrix() and getDisplayPoint(). The former implements Equations 13 through 18; the latter implements Equation 9. See the article "How to Calibrate Touch Screens" for more information.

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