Method and system for automatically identifying readings of pointer type meters

Abstract

The invention discloses a method and a system for automatically identifying readings of pointer type meters, which solve the problem that the prior meter reading identifying method needs relatively much known information and the reading is difficult to identify under the conditions that part of the graduation line is lost and the meter inclines and the like. The method comprises the following steps of: building graduation searching tables of different meters so as to form a database; acquiring images of the meters, inputting the images of the meters and preprocessing the images so as to extract the effective identification areas of the meter dial plates; extracting pointers and graduation lines from the effective identification areas of the meter dial plates according to the stroke characteristics of the graduation; and matching the extracted graduation lines with the corresponding graduation searching tables in the graduation searching table database according to the extracted pointers and graduation lines so as to automatically identify readings. The method has small dependence on known information of the meters, good commonality, strong robustness and relatively strong adaptability to the conditions such as transverse moving, rotating of the meters, noise interference and the like and accurate meter reading acquisition.

Description

Technical field [0001] The invention relates to the field of image processing, and in particular to a method and system for automatically recognizing the reading of a pointer type instrument. Background technique [0002] Pointer instruments are widely used in daily life. In special industries such as electric power departments, mines, and oil extraction areas, real-time monitoring of meters is required to prevent accidents caused by some parameters exceeding the standard. In the case of many meters, it is a tedious and tedious task to rely on manual monitoring of meters, and the monitoring personnel are easily affected by some subjective and objective factors, leading to great hidden dangers in human monitoring. With the development of digital image processing and pattern recognition technology, it has become possible to monitor meters in real time by computers instead of humans. One of the most important steps is the automatic recognition of meter readings. [0003] The existin...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a method and system for automatic identification of pointer instrument readings, so as to solve the problem that under the existing technical conditions, the identification of instrument readings requires more known information, some missing parts of the scale line, instrument tilt, etc. In case the reading is difficult to identify the problem

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