AUTOMATIC READING OF DISPLAYS
Calibrating and certifying measuring instruments is a time comsuming, manually executed task. The operator has to read several imes during an often lengthly procedure the display of the instrument to be certified and compare it to the reference value from the reference instrument. The instruments to be certified exhibit a large variety of forms, shapes, and display types. Reference instruments have a digital output that can be connected to a computer for reading, instruments to be certified mostly not.
We have developed a software system that helps to automize the calibration procedure by various means:
- A digital camera is used to capture the displays of one or various instruments during the measuring procedure.
- The display areas can be marked interactively by the operator.
- The snapshots are taken according to the protocol specifications for this kind of instrument at the same time as the reference data is read.
- Both the images (or only the marked areas) and the reference data are stored into a database.
- The operators workload is reduced to set-up the system and to read the snapshots according to the established procedure.
To further improve the system, we have implemented
- an automatic detection of the display areas and their rectanglur alignment (correctable interactively by the operator) and
- an automatic reading of the digits of the display (correctable interactively by the operator).
The fully automaic reading has a precision of more the 98% tested on more than 1400 displays.
- During the joint work with LOMG we developed the system SreC, which is capable of reading automatically digital displays.
Financed Projects
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Title: LEAME: Sistema de lecturas automático para aplicaciones en metrología mediante visión por computador
Start Date: 24/05/2008
End Date: 31/12/2008
Budget: 7500 €
Leaders: Arno Formella
Funding Bodies: Universidade de Vigo [2008-INOU-5], Excma. Deputación Provincial de Ourense
Publications
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Title: Digital instrumentation calibration using computer vision
Year: 2010
Editorial: Springer [LNCS]
Isbn: 978-3-642-13774-7
Issn: 0302-9743
Volumen: 6112
Pages: 335 - 344
City: Póvoa de Varzim
Country: Portugal
Conference Name: 7th International Conference on Image Analysis and Recognition (ICIAR'2010)
Type: Conference Contributions
Authors: Arno Formella, Ángel Dacal Nieto, Higinio González Jorge, Fernando Martín Rodríguez, Esteban Vázquez Fernández, V. Álvarez Valado
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Title: A machine vision system for the calibration of digital thermometers
Year: 2009
Journal: Measurement Science and Technology
Editorial: IOP Publishing Ltd
Issn: 0957-0233
Volumen: 20
Pages: 1 - 7
Impact factor: 1.493 (Q1)
Base: JCR 2013
Area: Multidisciplinary Engineering
Type: Journal Articles
Authors: Arno Formella, Ángel Dacal Nieto, Higinio González Jorge, Fernando Martín Rodríguez, Esteban Vázquez Fernández
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Title: Sistema de visión artificial para calibración de instrumentación con display digital
Year: 2009
Journal: 4th Congreso Español de Metrología
City: Santander
Country: Spain
Type: Conference Contributions
Authors: Arno Formella, Ángel Dacal Nieto, Higinio González Jorge, Esteban Vázquez Fernández, Mª Soledad Torres Guijarro, V. Álvarez Valado
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Title: SCIMVA: Sistema de calibración de instrumentación mediante visión artificial
Year: 2009
Isbn: 978-84-692-5024-2
Volumen: on CD
Pages: 1 - 4
City: Ourense
Country: Spain
Conference Name: IX Reunión Nacional de Óptica
Organizer: Universidade de Vigo
Type: Conference Contributions
Authors: Arno Formella, Ángel Dacal Nieto, Higinio González Jorge, Fernando Martín Rodríguez, Esteban Vázquez Fernández, V. Álvarez Valado
People Involved
- Dacal Nieto, Ángel
- Formella, Arno
- González Jorge, Higinio
- Martín Rodríguez, Fernando
- Montes Pedreira, Susana
- Torres Guijarro, Mª Soledad
- Vázquez Fernández, Esteban
Student Work
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Title: LEAME (Sistema de Lecturas Automático para Aplicaciones en Metrología Mediante Visión por Computador)
Year: 2009
Volumen: ENI-257
Type: Master's Thesis
Authors: Susana Montes Pedreira
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Title: Lectura automática de instrumentos de medida mediante técnicas de visión artificial
Year: 2008
Type: Master's Thesis
Authors: Esteban Vázquez Fernández
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Title: Sistema de calibración automática de termohigrómetros
Year: 2007
Volumen: ENI-181
Type: Master's Thesis
Authors: Ángel Dacal Nieto
