Automatic identification method of wide scale pointer instrument in substation

Abstract

The invention relates to a method for automatic recognition of a wide-scale pointer meter in a substation, wherein the shape of the digital scale in the wide-scale pointer meter is a rectangle, and the interval of the digital scale is 1; it is characterized in that it includes the following main steps: first read in the meter image, Preprocess the image; then identify the instrument scale, including automatic positioning of each rectangular instrument scale in the image, and sort the radial angle of the scale to realize the establishment of the instrument scale coordinate system; then, use the LSD-based straight line detection algorithm and scale distribution The ellipse circumference constraint is used to identify and locate the pointer; finally, the automatic interpretation of the instrument is realized, and the reading is performed. Subtracting the dependence on people in the identification process, the identification process does not require additional instrument scale parameter input. On the premise of ensuring the identification accuracy, the fast reading of the wide-scale pointer instrument can be realized, which can be used for substation inspection robots to perform inspection tasks. Has better intelligence.

Description

technical field [0001] The invention relates to the field of image pattern recognition, in particular to a method for automatic recognition of wide-scale pointer meters in substations. [0002] technical background [0003] Although digital instruments are more and more widely used, pointer instruments are still widely used in substations with harsh environments because of their strong anti-interference ability and high reliability of display recognition. Pointer instruments usually do not have the function of data line interface, and cannot automatically identify and return the readings in the meter. Therefore, the data recording of pointer instruments is mainly based on close-up observation by human eyes and manual recording. Repeated mechanical movements can easily cause human visual fatigue, resulting in errors in identifying and recording data. With the advancement of automation technology in substations, it has become a trend to use inspection robots to collect picture...

AI Technical Summary

Problems solved by technology

For the template matching method, it is necessary to manually calibrate the meter on the picture containing the meter first, and then match the calibrated meter on the picture to be recognized. This not only limits the types of meters, but also relies heavily on manual calibration, which is not conducive to The Development of Substation Automation

For the Hough transform, the traditional Hough transform algorithm has a long operation time and a large storage space, which makes the recognition process inefficient.

[0005] Due to the influence of the light and the shooting angle of the inspection robot, when the inspection robot is used to collect the pictures of the pointer meters in the substation, the meters in the pictures are usually stretched, which will affect the recognition and accurate reading of the dashboard

Images