Liquid-level measurement using a single digital camera

Wang, Ti Ho; Lu, Mingyue; Hsu, Chen-Chien; Chen, Cheng Chuan; Tan, Jia

doi:10.1016/j.measurement.2008.10.006

Cited by 58 publications

(24 citation statements)

References 8 publications

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“…Se han realizado investigaciones que buscan remplazar instrumentos físicos por otros que posean características especiales, brindando igual o mayor información y confiabilidad en las variables medidas [1], [2]. Los sensores o instrumentos virtuales son resultado de algunas de estas investigaciones, emulan el comportamiento de instrumentos reales y su operación se basa en la relación que existe entre las variables medibles y métodos para estimación de otras [3], [4].…”

Section: Introductionunclassified

Medición de pérdidas de presión usando visión por computador

Cerquera-Yacumal

Córdoba-Papamija

Realpe-Chamorro

et al. 2016

Iteckne

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Resumen-En un circuito hidráulico, el fluido sufre pér-didas de presión al atravesar tramos o diferentes accesorios, estas pueden ser inspeccionadas observando el nivel del fluido en piezómetros. Este trabajo presenta un desarrollo en visión artificial, que permite la medición en línea de los niveles de presión registrados en dieciséis columnas piezométricas. La técnica de extracción de fondo basada en el algoritmo de Codebook, combinada con el filtrado morfológico y unión de blobs, es usada para obtener los niveles piezométricos. El algoritmo de procesamiento está diseñado en Open CV y soportado en Linux. Se obtuvieron coeficientes de variación inferiores al 0,1% y errores máximos del 1,4 %.Palabras clave-Codebook, extracción de fondo, instrumentación y medición, piezómetro, visión por computador.Abstract-In a hydraulic circuit, the fluid pressure loss when passing through different sections or accessories, and it can be inspected by observing the fluid level in piezometers. This paper presents a development in artificial vision, which allows on-line measurement of pressure levels recorded in sixteen piezometric columns. The technique of background subtraction based in algorithm on Codebook, combined with morphological filtering and junction blobs, are used to obtain piezometrics levels. The processing algorithm is designed in Open CV and supported on Linux. Coefficients of variation of less than 0.1% and maximum error of 1.4% were obtained.

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Section: Introductionunclassified

Medición de pérdidas de presión usando visión por computador

Cerquera-Yacumal

Córdoba-Papamija

Realpe-Chamorro

et al. 2016

Iteckne

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“…There are different ways to determine the liquid-level variations with high precision. [9][10][11][12] We suggest the use of a micro-level working, cheap, and easy-to-construct electromechanical sensor [13] recently used in a pluviometer construction. [14] The automated pan suggested here requires minimum user intervention, and water-level changes may be recorded and=or sent via wireless systems.…”

Section: Introductionmentioning

confidence: 99%

An Automatic Sensor-Controlled Evaporation and Rainfall Measurement System

Onacak

Yürür

2011

Instrumentation Science & Technology

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& For the efficient management of water, meteorological and hydrological services need to know how much water evaporates from natural lakes and reservoirs during particularly hot summer months. Following the technical requirements of the World Meteorological Organization on use of an evaporation pan for this purpose, we improved the use of the classical evaporation pan to measure at any time, with high precision, both evaporation and rainfall for a given locality. A microcontroller energizes a simple electromechanical level-measurement system to maintain the water level within a determined depth interval, and to measure the depth of water decreases (evaporation with 32 lm precision) or increases (rainfall with 4 lm precision). A prototype was succesful for 1 month (late summer) of field testing, but a longer testing period would be necessary to suggest its use in modern meteorological stations.

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“…As a result, performance of real-time measurement via the pattern recognition or image analysis methods was generally not satisfactory because of the speed constraint. As an attempt to solve this problem, an image-based distance measuring system (IBDMS) [15]- [17] was proposed to measure distance and area using a CCD camera based on a triangular relationship. Unfortunately, the IBDMS is valid only for measuring objects or surfaces that are perfectly perpendicular to the optical axis.…”

Section: Introductionmentioning

confidence: 99%

Image-based system for measuring objects on an oblique surface

Hsu

Wang

et al. 2010

2010 IEEE Instrumentation &Amp; Measurement Technology Conference Proceedings

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This paper presents an image-based framework for measuring target objects on an oblique plane by using a single CCD camera and two parallel laser projectors beside the camera. Because of the alignment of the laser beams which form in parallel with the optical axis, projected spots in the image can be processed to establish relationships between distance and pixel counts between the projected spots in the image. Based on simple geometrical derivations without complex image processing, the proposed approach can measure the photographing distance, the distance between two arbitrary points on the oblique surface, and the incline angle. Experiment results have demonstrated the effectiveness of the proposed approach in measuring distant objects on an oblique plane.

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Liquid-level measurement using a single digital camera

Cited by 58 publications

References 8 publications

Medición de pérdidas de presión usando visión por computador

Medición de pérdidas de presión usando visión por computador

An Automatic Sensor-Controlled Evaporation and Rainfall Measurement System

Image-based system for measuring objects on an oblique surface

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