Título: An Improved Image Contrast Assessment Method
Autores: Fan, Yuanyuan; Huaiyin Institute of Technology
Sang, Yingjun; Huaiyin Institute of Technology
Hu, Guang; Huaiyin Institute of Technology
Zhou, Zaijin; Huaiyin Institute of Technology
Hao, Yunrong; Huaiyin Institute of Technology
Fecha: 2013-09-26
Publicador: TELKOMNIKA: Indonesian journal of electrical engineering
Fuente:
Tipo: info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Tema: image quality assessment; contrast; wavelet transform ; contrast sensitivity; human visual system
Descripción: Contrast is an important factor affecting the image quality. In order to overcome the problems of local band-limited contrast, a novel image contrast assessment method based on the property of HVS is proposed. Firstly, the image by low-pass filter is performed fast wavelet decomposition. Secondly, all levels of band-pass filtered image and its corresponding low-pass filtered image are obtained by processing wavelet coefficients. Thirdly, local band-limited contrast is calculated, and the local band-limited contrast entropy is calculated according to the definition of entropy, Finally, the contrast entropy of image is obtained by averaging the local band-limited contrast entropy weighed using CSF coefficient. The experiment results show that the best contrast image can be accurately identified in the sequence images obtained by adjusting the exposure time and stretching gray respectively, the assessment results accord with human visual characteristics and make up the lack of local band-limited contrast.
Idioma: Inglés