Quantifying Contrast Methods through Morphological Gradient
Métodos para Cuantificar el Contraste a través del Gradiente Morfológico
Jorge D. Mendiola–Santibañez1, Iván R. Terol–Villalobos2
1 Universidad Autónoma de Querétaro
Doctorado en Ingeniería, ]]>
76000, Querétaro, México
mendijor@uaq.mx
2 CIDETEQ, S.C.,
Parque Tecnológico S/N, San Fandila–Pedro Escobedo, 76700,
Querétaro, México
famter@ciateq.net.mx
Article received on september 14, 2004; accepted on march 17, 2005
]]> Abstract
In this work two quantifying contrast models are proposed. The first contrast measure method employs the concept denominated difference of contrast; while the second one takes in consideration the luminance gradient concept. These models allow the selection of the best parameters in a group of output images obtained from the application of the morphological toggle mappings with size criteria. These morphological transformations have the characteristic of modifying the output contrast based on some proximity criterion. In order to illustrate the performance of these quantifying contrast models, a number of images were processed and compared at pixel and partition level.
Keywords: Contrast Measure, Toggle Mappings, Flat Zone, Partition, Visualization.
Resumen
En este trabajo son propuestos dos modelos para cuantificar el contraste. El primer método para evaluar el contraste emplea el concepto denominado diferencia de contraste, mientras que el segundo método toma en consideración el concepto de gradiente de la luminancia. Estos modelos permiten la selección del mejor parámetro en un grupo de imagines de salida obtenidas a partir de la aplicación de los mapeos de contraste morfológicos con criterio de tamaño. Estas transformaciones morfológicas tienen la característica de modificar el contraste de salida basados algún criterio de proximidad. Para ilustrar el comportamiento de estos modelos que permiten cuantificar el contraste, un número de imágenes fueron procesadas y comparadas tanto a nivel píxel como a nivel partición.
Palabras Clave: Medida de Contraste, Mapeos de Contraste, Zona Plana, Partición, Visualización.
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]]> Acknowledgments
The author Jorge D. Mendiola Santibañez would like to thank CONACyT México for the financial support. The author I. Terol would like to thank Diego Rodrigo and Darío T.G. for their great encouragement. This work was partially funded by the government agency CONACyT (Mexico) under the grant 41170.
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