Visual calibration of CRT monitors
- Autores
- Colombo, Elisa Margarita; Derrington, Andrew
- Año de publicación
- 2001
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- In this paper, we develop and test a technique for calibrating a computer-controlled television monitor using a visual comparison instead of a photometer. The basic principle of the calibration is to compare a patch of pixels that are uniformly driven for an adjustable voltage with a patch in which a predetermined fraction of the pixels are set to the maximum voltage and the remainder are set to the minimum. By adjusting the voltage to make the two patches appear equally bright we get an estimate of the voltage that produces the predetermined fraction of the maximum luminance. Smooth functions were fit to the relationship between the DAC output and the fraction of illuminated pixels using a least-squares method, and used to estimate the function relating screen luminance to voltage. This function was then used to calculate lookup tables for linearisation. Sinusoidal and beat (sum of two sinusoids) luminance modulations were generated from the calibrated lookup tables and their profiles were measured with a photometer in order to check the calibrations. We find that visual calibration is sufficiently reliable to be used as an alternative to calibration using a photometer. It is easier and cheaper than using a photometer: a good photometer can be more expensive than the combined cost of the computer, graphics card and monitor.
Fil: Colombo, Elisa Margarita. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Instituto de Investigación en Luz, Ambiente y Visión. Universidad Nacional de Tucumán. Facultad de Ciencias Exactas y Tecnología. Instituto de Investigación en Luz, Ambiente y Visión; Argentina
Fil: Derrington, Andrew. University or Park; Reino Unido - Materia
-
DISPLAYS NON LINEARITY
CRT MONITORS
PSYCHOPHYSICS
CALIBRATION
VISION - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
- Repositorio
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/105783
Ver los metadatos del registro completo
id |
CONICETDig_206490541a118d60c3f3fbfd606437b3 |
---|---|
oai_identifier_str |
oai:ri.conicet.gov.ar:11336/105783 |
network_acronym_str |
CONICETDig |
repository_id_str |
3498 |
network_name_str |
CONICET Digital (CONICET) |
spelling |
Visual calibration of CRT monitorsColombo, Elisa MargaritaDerrington, AndrewDISPLAYS NON LINEARITYCRT MONITORSPSYCHOPHYSICSCALIBRATIONVISIONhttps://purl.org/becyt/ford/2.11https://purl.org/becyt/ford/2In this paper, we develop and test a technique for calibrating a computer-controlled television monitor using a visual comparison instead of a photometer. The basic principle of the calibration is to compare a patch of pixels that are uniformly driven for an adjustable voltage with a patch in which a predetermined fraction of the pixels are set to the maximum voltage and the remainder are set to the minimum. By adjusting the voltage to make the two patches appear equally bright we get an estimate of the voltage that produces the predetermined fraction of the maximum luminance. Smooth functions were fit to the relationship between the DAC output and the fraction of illuminated pixels using a least-squares method, and used to estimate the function relating screen luminance to voltage. This function was then used to calculate lookup tables for linearisation. Sinusoidal and beat (sum of two sinusoids) luminance modulations were generated from the calibrated lookup tables and their profiles were measured with a photometer in order to check the calibrations. We find that visual calibration is sufficiently reliable to be used as an alternative to calibration using a photometer. It is easier and cheaper than using a photometer: a good photometer can be more expensive than the combined cost of the computer, graphics card and monitor.Fil: Colombo, Elisa Margarita. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Instituto de Investigación en Luz, Ambiente y Visión. Universidad Nacional de Tucumán. Facultad de Ciencias Exactas y Tecnología. Instituto de Investigación en Luz, Ambiente y Visión; ArgentinaFil: Derrington, Andrew. University or Park; Reino UnidoElsevier Science2001-07info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/105783Colombo, Elisa Margarita; Derrington, Andrew; Visual calibration of CRT monitors; Elsevier Science; Displays; 22; 3; 7-2001; 87-950141-9382CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1016/S0141-9382(01)00055-5info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0141938201000555info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:35:27Zoai:ri.conicet.gov.ar:11336/105783instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 09:35:27.368CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
dc.title.none.fl_str_mv |
Visual calibration of CRT monitors |
title |
Visual calibration of CRT monitors |
spellingShingle |
Visual calibration of CRT monitors Colombo, Elisa Margarita DISPLAYS NON LINEARITY CRT MONITORS PSYCHOPHYSICS CALIBRATION VISION |
title_short |
Visual calibration of CRT monitors |
title_full |
Visual calibration of CRT monitors |
title_fullStr |
Visual calibration of CRT monitors |
title_full_unstemmed |
Visual calibration of CRT monitors |
title_sort |
Visual calibration of CRT monitors |
dc.creator.none.fl_str_mv |
Colombo, Elisa Margarita Derrington, Andrew |
author |
Colombo, Elisa Margarita |
author_facet |
Colombo, Elisa Margarita Derrington, Andrew |
author_role |
author |
author2 |
Derrington, Andrew |
author2_role |
author |
dc.subject.none.fl_str_mv |
DISPLAYS NON LINEARITY CRT MONITORS PSYCHOPHYSICS CALIBRATION VISION |
topic |
DISPLAYS NON LINEARITY CRT MONITORS PSYCHOPHYSICS CALIBRATION VISION |
purl_subject.fl_str_mv |
https://purl.org/becyt/ford/2.11 https://purl.org/becyt/ford/2 |
dc.description.none.fl_txt_mv |
In this paper, we develop and test a technique for calibrating a computer-controlled television monitor using a visual comparison instead of a photometer. The basic principle of the calibration is to compare a patch of pixels that are uniformly driven for an adjustable voltage with a patch in which a predetermined fraction of the pixels are set to the maximum voltage and the remainder are set to the minimum. By adjusting the voltage to make the two patches appear equally bright we get an estimate of the voltage that produces the predetermined fraction of the maximum luminance. Smooth functions were fit to the relationship between the DAC output and the fraction of illuminated pixels using a least-squares method, and used to estimate the function relating screen luminance to voltage. This function was then used to calculate lookup tables for linearisation. Sinusoidal and beat (sum of two sinusoids) luminance modulations were generated from the calibrated lookup tables and their profiles were measured with a photometer in order to check the calibrations. We find that visual calibration is sufficiently reliable to be used as an alternative to calibration using a photometer. It is easier and cheaper than using a photometer: a good photometer can be more expensive than the combined cost of the computer, graphics card and monitor. Fil: Colombo, Elisa Margarita. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Instituto de Investigación en Luz, Ambiente y Visión. Universidad Nacional de Tucumán. Facultad de Ciencias Exactas y Tecnología. Instituto de Investigación en Luz, Ambiente y Visión; Argentina Fil: Derrington, Andrew. University or Park; Reino Unido |
description |
In this paper, we develop and test a technique for calibrating a computer-controlled television monitor using a visual comparison instead of a photometer. The basic principle of the calibration is to compare a patch of pixels that are uniformly driven for an adjustable voltage with a patch in which a predetermined fraction of the pixels are set to the maximum voltage and the remainder are set to the minimum. By adjusting the voltage to make the two patches appear equally bright we get an estimate of the voltage that produces the predetermined fraction of the maximum luminance. Smooth functions were fit to the relationship between the DAC output and the fraction of illuminated pixels using a least-squares method, and used to estimate the function relating screen luminance to voltage. This function was then used to calculate lookup tables for linearisation. Sinusoidal and beat (sum of two sinusoids) luminance modulations were generated from the calibrated lookup tables and their profiles were measured with a photometer in order to check the calibrations. We find that visual calibration is sufficiently reliable to be used as an alternative to calibration using a photometer. It is easier and cheaper than using a photometer: a good photometer can be more expensive than the combined cost of the computer, graphics card and monitor. |
publishDate |
2001 |
dc.date.none.fl_str_mv |
2001-07 |
dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo |
format |
article |
status_str |
publishedVersion |
dc.identifier.none.fl_str_mv |
http://hdl.handle.net/11336/105783 Colombo, Elisa Margarita; Derrington, Andrew; Visual calibration of CRT monitors; Elsevier Science; Displays; 22; 3; 7-2001; 87-95 0141-9382 CONICET Digital CONICET |
url |
http://hdl.handle.net/11336/105783 |
identifier_str_mv |
Colombo, Elisa Margarita; Derrington, Andrew; Visual calibration of CRT monitors; Elsevier Science; Displays; 22; 3; 7-2001; 87-95 0141-9382 CONICET Digital CONICET |
dc.language.none.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
info:eu-repo/semantics/altIdentifier/doi/10.1016/S0141-9382(01)00055-5 info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0141938201000555 |
dc.rights.none.fl_str_mv |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
eu_rights_str_mv |
openAccess |
rights_invalid_str_mv |
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
dc.format.none.fl_str_mv |
application/pdf application/pdf |
dc.publisher.none.fl_str_mv |
Elsevier Science |
publisher.none.fl_str_mv |
Elsevier Science |
dc.source.none.fl_str_mv |
reponame:CONICET Digital (CONICET) instname:Consejo Nacional de Investigaciones Científicas y Técnicas |
reponame_str |
CONICET Digital (CONICET) |
collection |
CONICET Digital (CONICET) |
instname_str |
Consejo Nacional de Investigaciones Científicas y Técnicas |
repository.name.fl_str_mv |
CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas |
repository.mail.fl_str_mv |
dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar |
_version_ |
1844613104507289600 |
score |
13.070432 |