A design method for automatic reading system for rulers based on machine vision and embedded technology is proposed.The system is cored with 32-bits ARM9 microcontroller S3C2440 and WINCE 5.0 as embedded operating system to complete the ruler’s image acquisition

processing and display through the use of Embedded Visual C++ 4.0 software platform.The precise scale in the centre ruler field of view is located by designing a new algorithm for numeral recognition.Experimental results indicate that the measuring precision of this system can achieve high-speed and high-precision

which improves aspects of the reliability

stability and automation degree.