Contrast Enhancement and Illumination Changes Compensation
Edgar A. Rivas Araiza1, Jorge D. Mendiola Santibañez1,2, Gilberto Herrera Ruiz1, Carlos A. González Gutiérrez1,2, Mario Trejo Perea1 y G. J. Ríos Moreno1
1 Doctorado en Ingeniería, Universidad Autónoma de Querétaro, Cerro de las Campanas S/N, C.P. 76010, Querétaro, México. erivas@uaq.mx ; mendijor@uaq.mx ; gherrera@uaq.mx ; carlosg@uaq.mx ; mtp@uaq.mx ; riosg@uaq.mx
2 Universidad del Valle de México, Campus Querétaro Blvd. Villas del Mesón No. 1000 Col. Provincia Juriquilla, C.P. 76230 Querétaro, México mendijor@uaq.mx ; carlosg@uaq.mx
Artículo recibido en Marzo 22, 2007 ]]> Aceptado en Junio 10, 2007
Resumen
En este artículo se presenta un operador de contraste construido por medio de dos primitivas que involucran a la Ley de Weber. El mapeo de contraste propuesto tiene dos finalidades; en primer lugar la mejora de contraste, y en segundo lugar la normalización de la imagen procesada. La mejora de contraste está basada en la detección del fondo de la imagen (background); dicho parámetro se calcula a partir del análisis de los mínimos regionales, los cuales se obtienen por medio de la cerradura morfológica por reconstrucción. Para mostrar el desempeño de la transformación propuesta, algunos ejemplos son presentados. En dichos ejemplos se tratan imágenes con efectos indeseables de iluminación caracterizadas por la presencia de sombras.
Palabras clave: Ley de Weber, contraste, filtros morfológicos por reconstrucción, compensación en cambios de iluminación.
Abstract
In this paper a contrast operator built by means of two primitives involving Weber's Law is presented. The proposed contrast mapping has two objectives, in the first place the contrast enhancement and in the second, the normalization of the processed image. The contrast enhancement is based on the image background detection; this parameter is computed through the analysis of the regional minimums, which are detected by means of the morphological closing by reconstruction. To show the performance of the proposed transformation, some examples are presented. In the examples some images with undesirable illumination effects characterized by the presence of shades are processed.
Keywords: Weber's Law, contrast, morphological building filters, illumination changes compensation.
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Agradecimientos
Los autores Edgar Rivas Araiza, José Gabriel Ríos Moreno y Mario Trejo Perea agradecen a CONACYT por la beca otorgada para realizar sus estudios de doctorado. Así como al Dr. Mario E. Rodríguez García y al M. en I. Fernando Romero Vázquez por su contribución en la revisión del presente trabajo. El autor Jorge D. Mendiola Santibañez agradece al CONACYT, México por el apoyo económico. Este artículo fue realizado parcialmente bajo el proyecto 62378.
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