Circular pointer-type dial visual sense positioning and automatic reading method

Abstract

The invention discloses a circular pointer-type dial visual sense positioning and automatic reading method and belongs to the field of power meter automation and visual sense application. The invention comprises the following steps: reading a dial image with a complicated background; graying and equalizing the image; then, automatically locating the central position of the circular dial by random Hough transform; and simultaneously detecting a plurality of circular contours corresponding to the central position; taking the area with the largest contour to extract the accurate dial image; taking the radius corresponding to the smallest circular contour and performing random Huff's accumulation detection outward to obtain two adjacent large circles with the strip area between the two large circles being a dial scale area; performing threshold segmentation and re-expansion and the connected domain filtering to find out the initial position and the ending position of the graduation; and using the linear fitting method to find out the position of the pointer and calculating the reading. The method of the present invention can directly locate a circular instrument and multiple rings in the instrument under a complicated background, and at the same time, a new algorithm to locate the position of the pointer is proposed.

Description

technical field [0001] The invention relates to the field of electric meter automation and its visual application, in particular to a method for visual positioning and automatic reading of a circular pointer dial. Background technique [0002] In industrial practice, the existence of electric meters is very common, requiring a lot of manpower and material resources for meter reading. Although the emergence of electronic meters has greatly reduced related work, most of them are still traditional physical pointer meters in many factories. Pointer instruments have the advantages of precision and anti-interference, and it takes a lot of money to replace traditional pointer instruments on a large scale. [0003] Using manual operation to check the meter has high work intensity, low efficiency, and human error, low degree of automation, large human factors, and lack of objective scientific evaluation and testing standards and basis. Therefore, if the monitoring equipment existing ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problems of slow traditional Hough transformation, low positioning accuracy and complex filling algorithm in pointer detection in the prior art, and provide a circular pointer dial visual positioning and automatic reading method, using improved random Hough Transformation, positioning is accurate and fast, and a new algorithm for locating the pointer position is proposed at the same time

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