A water meter small flow verification method based on machine vision

A technology of machine vision and small flow, which is applied in liquid/fluid solid measurement, testing/calibration of volume flow, instruments, etc. It can solve the problems of reading the number of rotations of plum blossom rotors, achieve objective verification results and reduce manual labor intensity. Effect

Active Publication Date: 2020-09-29
CHINA JILIANG UNIV
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Problems solved by technology

The invention can be used to solve the problem of reading the rotation number of the quincunx rotor

Method used

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  • A water meter small flow verification method based on machine vision
  • A water meter small flow verification method based on machine vision
  • A water meter small flow verification method based on machine vision

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Embodiment

[0054] The volume corresponding to one revolution is 0.0001m 3 Take the eight-tooth plum blossom rotor water meter as an example, the flow point is 0.8m 3 In the case of / h, the test takes 60 seconds, and the theoretical number of turns of the water meter is 133.33 turns. According to formula (2), it can be found that at this flow point, the minimum sampling frequency of the camera is 71.11FPS, so the camera with a frame number of 120FPS can be selected to count the actual turns of the plum blossom rotor with the method of the present invention. It is calculated that the camera collects one frame of image every time the plum blossom rotor rotates 6.67°, and superimposes the images to obtain several superimposed images, as shown in Figure 9 shown. The percentages of black dots of the superimposed quincunx rotors in the calculation graph are 26.02%, 35.62%, 43.27%, 45.32%, 44.99%, 42.16%, 33.23%, 28.25%, 38.12%, 44.04%, 45.38%. The law of first increasing and then decreasing...

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Abstract

The invention discloses a small flow verification method of a water meter based on machine vision. In the method, an industrial camera is used to collect the image of the plum blossom rotor of the water meter, and the position of the plum blossom rotor at the beginning of the verification is selected as the reference position, and the corresponding image is the initial frame. The method superimposes and binarizes the image of each subsequent frame on the background of the initial frame image, draws a graph by calculating the proportion of black dots in the image, and binarizes the graph with a variable threshold method processing, and then calculate the number of turns of the plum blossom rotor within the verification time by the principle of double timing, and obtain the indicated volume of the water meter under inspection within this period. The invention can greatly reduce the labor intensity of operators and realize the automation of water meter verification, which is of great significance to water meter verification.

Description

technical field [0001] The invention belongs to the technical field of automatic detection, and in particular relates to a small flow verification method of a water meter based on machine vision. Background technique [0002] Mechanical water meters are the most commonly used water meters at present because of their low price and the characteristics of meeting the daily water flow measurement. The water meter has strict verification regulations, especially in the case of small flow verification, the reading accuracy of the pointer is not enough. Although there are many water meter verification devices on the market, most of them are mainly based on manual reading of the water meter dial. A few water meter verification devices use the photoelectric pulse method. Although this method reduces labor intensity and improves automation, this method The position of the laser point of the laser sensor is on the plum blossom rotor. Because the position of the plum blossom rotor on th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F25/00G06K9/32G06K9/38
CPCG01F25/10G06V20/62G06V10/28
Inventor 林柯楠黄咏梅
Owner CHINA JILIANG UNIV
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