Currently, the calibration work of analog measurement instruments is mainly completed by manual and there are many
problems waiting for being solved. In this paper, an automatic calibration system (ACS) based on Digital Signal
Processor (DSP) and Charge Coupled Device (CCD) sensor is developed and a real-time calibration algorithm is
presented. In the ACS, TI DM643 DSP processes the data received by CCD sensor and the outcome is displayed on
Liquid Crystal Display (LCD) screen. For the algorithm, pointer region is firstly extracted for improving calibration
speed. And then a math model of the pointer is built to thin the pointer and determine the instrument's reading. Through
numbers of experiments, the time of once reading is no more than 20 milliseconds while it needs several seconds if it is
done manually. At the same time, the error of the instrument's reading satisfies the request of the instruments. It is
proven that the automatic calibration system can effectively accomplish the calibration work of the analog measurement
instruments.
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