Pointer type instrument inclination correction method and system

Abstract

The embodiment of the invention provides a pointer type instrument inclination correction method and system, and the method comprises the steps: inputting a to-be-corrected inclination instrument image into a key point detection model, and obtaining a detection key scale digital coordinate; performing ellipse fitting on the detection key scale digital coordinates based on a least square method toobtain a fitting ellipse; obtaining ellipse parameters, and determining coordinate points before perspective transformation; determining an excircle of the ellipse, and determining a coordinate pointafter perspective transformation; obtaining a perspective transformation matrix according to the coordinate points before perspective transformation and the coordinate points after perspective transformation; and performing perspective transformation on the instrument image to be corrected according to the perspective transformation matrix to obtain a corrected front-view instrument image. The keyscale coordinates are acquired to fit the ellipse, the ellipse transformation principle is combined, perspective transformation is used to realize inclination correction of the instrument, the robustness is good, and inclination correction of any circular instrument can still be accurately realized under the conditions of dial shielding, fuzziness, uneven illumination and the like.

Description

technical field [0001] The embodiment of the present invention relates to the technical field of intelligent identification, and in particular to a method and system for correcting the inclination of a pointer instrument. Background technique [0002] In the prior art, for example, in a substation system, there are a large number of pointer instruments used to detect the working status of equipment, and it is a heavy task to detect and read these instruments. With the rapid development of smart electric power, robots are gradually replacing humans to complete the intelligent detection and reading of various instruments. However, during the detection process, the robot often takes images of the instrument from different angles, and the pointer instrument is a circular scale instrument, and the accuracy of the reading depends largely on the detection angle of the instrument. [0003] When the camera is directly facing the instrument to capture the image, the collected instrum...

AI Technical Summary

Problems solved by technology

The tilt correction of the instrument is mainly achieved through feature matching between the template image and the image to be recognized. This method has a slow matching speed and requires pre-collection of various template images, which has poor applicability.

There are also some technologies that artificially add reference objects before collecting images, and finally realize instrument tilt correction through perspective transformation according to changes in reference objects. This method is complicated to operate, inflexible, and difficult to apply in industrial environments.

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