Water meter reading positioning and identifying method

Abstract

The invention relates to a water meter reading positioning and recognition method, belongs to the field of character recognition, and aims to solve the problem that a water company still adopts a manual meter reading mode for some old community users at present, so that the research on water meter recognition not only can reduce the workload of workers, but also ensures the accuracy of data. A water meter recognition system mainly comprises water meter reading area positioning and digital recognition, character positioning is the key of recognition, but due to the factors of complex background in the natural environment, different distances of shot water meter images, angle diversification, illumination and the like, the traditional method is low in positioning accuracy, and therefore the positioning accuracy of the traditional method is low. The invention provides a quick and accurate method for identifying the water meter. The method comprises the following steps: firstly, positioning a water meter reading area by adopting an EAST network, then improving the quality of a water meter picture through linear enhancement of a digital area cut according to a positioning frame, and then segmenting a digital through horizontal and vertical projection and morphological operation, thereby effectively eliminating the influence of noise points and borders around the digital on characters. And finally, identifying the characters by adopting Tesseract-OCR (Optical Character Recognition).

Description

technical field [0001] The invention belongs to the field of water meter image processing, in particular to a method for positioning and identifying water meter readings. Background technique [0002] At present, water companies still use manual meter reading for some old community users. This method not only wastes a lot of human resources but also takes a long time, and the accuracy and real-time performance of meter reading cannot be guaranteed. With the accuracy of intelligent data, it can greatly reduce the workload of staff. [0003] The water meter recognition system mainly includes water meter reading area positioning and digital recognition, among which character positioning is the key to recognition. At this stage, Li Yuan proposed to use mathematical morphology processing and tilt correction first, then make a difference on the projection curve in the horizontal direction, and the coordinates corresponding to the maximum and minimum values ​​in the difference gra...

AI Technical Summary

Problems solved by technology

In the natural environment, the dial of the water meter is defaced, and the above method is also easily affected by the light, shooting angle and height, so it is very difficult to locate the reading of the water meter

In the character recognition part, most of the recognition algorithms are improved Hausdorff distance template matching method and OCR. Although the template-based matching algorithm is simple and fast, it has high requirements for characters and is difficult to apply to most scenarios. Medium, while optical character recognition has a high recognition rate for clear and clean numbers

Images