Research on Pointer Locating for Analog Measuring Instrument

Abstract

This paper presents a pointer positioning method based on Hough transform, which turns an arc scale to a transverse rectangular scales, scans the region from bottom to top line by line, determines smaller rectangular area containing pointer only, uses Hough transform in linear theory to detect the pointer position in the region. Experiments show that this method can locate the pointer position quickly and efficiently in analog measuring instruments.

Research on the Calibration Method for Analog Measuring Instrument

“…Simple extraction and recognition methods are usually used to calibration digital recognition in analog measuring instruments [1]. Calibration digital are generally composes of two digits, but numbers in identifying are based on the characteristics of the single number [2].…”