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A method for automatically identify pointer type instrument

An automatic identification and pointer-type technology, applied in the field of image recognition, can solve the problems of low positioning accuracy and recognition accuracy, and achieve the effects of improving adaptability and stability, improving recognition accuracy, and compact connection

Active Publication Date: 2019-03-01
南京鑫和汇通电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of low positioning accuracy and recognition accuracy in the automatic identification of pointer instruments in the prior art, the present invention proposes an automatic identification method for pointer instruments

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0021] Embodiment: a method for automatic identification of pointer instruments, comprising the following steps: Step 1, collecting template images of each type of instrument in the substation, obtaining the scale distribution and pointer position of each template image, any template image and the scale on it The distribution and pointer position are saved in a file, each file has a different name, and is recorded as a model file to distinguish the model category; step 2, zoom in, zoom out and rotate each template image to obtain the model in the same coordinate system Multi-angle and multi-scale homologous images of the same type, and extract the features of the homologous images that are conducive to tracking (Good Feature To Track) (referred to as GFTT features), save the feature points and calculate the feature vectors for normalization processing, and perform similar The image modeling of the instrument realizes the modeling of similar instruments with multiple angles and ...

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Abstract

The invention provides an automatic recognition method of pointer-type instruments, which collects template images of each instrument in a substation, obtains its scale distribution and pointer position, and classifies and saves the images. Each template image is enlarged, reduced and rotated to obtain the same kind of multi-angle and multi-scale homologous images for image modeling of similar instruments; inputting the instrument image to be detected, extracting ellipse and rectangle region, matching the extracted region with different template images, calculating the region matching degree,and judging the region matching degree higher than the region threshold value as the instrument region; a line segment detection is carry out on that meter area and a pointer match degree is calculated, and if the pointer matching degree is high than a pointer threshold value, the pointer is judged to be a pointer; according to the results of pointer positioning, two pointer scales which are nearest to each other are found, and the corresponding template images are compared to calculate the pointer readings. The invention solves the problem that the automatic identification positioning accuracy and the identification accuracy of the meter are low, and improves the identification accuracy.

Description

technical field [0001] The invention relates to the technical field of image recognition, in particular to an automatic recognition method for a pointer instrument. Background technique [0002] Pointer meters have the advantages of simple structure and high reliability, and are widely used in substations to monitor the operating status of power equipment. For the automatic identification of pointer instruments, the existing research includes using the hough transform to identify the pointer and the scale at the same time, but using the hough transform to locate the instrument is prone to positioning errors; when performing instrument modeling, many current methods need to identify each substation Modeling a single electric meter requires heavy workload and low practicability. Moreover, in the actual application process, affected by the external environment and equipment conditions, the images of the same kind of meters collected are different, and the angle, size and expos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/46G06K9/62
CPCG06V10/44G06V10/751G06V2201/02G06F18/23G06F18/24
Inventor 汪辉任大明刘晶丁飞任昌
Owner 南京鑫和汇通电子科技有限公司