Pointer instrument reading identification method

Abstract

The invention discloses a pointer instrument reading identification method. The method comprises the steps of extracting a dial plate, removing interference, and correcting the dial plate by using affine transformation; performing circle detection and straight line detection on the dial plate to obtain predicted circle center and pointer angle; based on features of a scale connected domain on thedial plate, screening out the scale connected domain, performing linear fitting on the scale connected domain, calculating an intersection point of every two fitting straight lines, and performing screening verification on a to-be-selected circle center by utilizing the predicted circle center and pointer angle to obtain the circle center of the dial plate, wherein a distance from the centroid ofthe scale connected domain to the circle center on the dial plate is the radius of the dial plate; and according to information such as the circle center of the dial plate, the radius of the dial plate, the straight lines of a pointer, extracting an arc scale bar of the dial plate, expanding the arc scale bar in a rectangular shape, then according to horizontal coordinate distribution of scale onthe rectangular scale bar, performing minimum and maximum scale detection, noisy point removal and scale insertion, and finally in combination with the pointer angle, calculating reading of the dial plate. The method is high in universality and high in timeliness; and the reading has relatively high accuracy.

Description

technical field [0001] The invention belongs to the technical field of image processing, and more particularly relates to a reading recognition method of a pointer instrument. Background technique [0002] In testing technology, pointer instruments are widely used in electric power, petroleum, chemical industry and other industries because of their simple structure and convenient use. In some test sites, such as outdoors that are not easy to observe or places that are harmful to personnel, it is difficult and dangerous to read the meter manually. In a working environment with harsh conditions, few people or a large amount of data, it is more difficult to guarantee its accuracy and work efficiency. Applying image processing technology to the automatic recognition of instrument readings can improve the accuracy of readings, reduce labor costs, and improve efficiency. [0003] For pointer instruments, the existing automatic recognition algorithm for pointer instrument reading...

AI Technical Summary

Problems solved by technology

[0009] Aiming at the above defects or improvement needs of the prior art, the present invention provides a method for identifying readings of pointer meters, thereby solving the problem that the relative position of the camera and the dial of the meter is not fixed, and the light in the external environment is not stable. Uniformity, poor camera imaging quality, etc., the technical problem of low recognition accuracy

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