Journal
AIN SHAMS ENGINEERING JOURNAL
Volume 9, Issue 4, Pages 1689-1704Publisher
ELSEVIER
DOI: 10.1016/j.asej.2016.12.003
Keywords
Image texture; Fractional differentiation; Auto-correlation function; Texture enhancement; G-L definition; Gray level co-occurrence matrix
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Texture plays an important role in the low-level image analysis and understanding in the field of computer vision. Texture based image enhancement is very important in many applications. In order to attain texture enhancement in images, a modified version of the Grunwald-Letnikov (G-L) definition based fractional differential operator is proposed in this paper. Considering the G-L based fractional differential operator's basic definition and implementation, a filter is devised and its applicability for texture enhancement is analyzed. Subsequently, the filter is modified by considering the auto-correlation effect between pixels in a neighborhood. Experiments are carried out on a number of standard texture-rich images and it is proved that the modified filter enhances the image contrast by nonlinearly enhancing the image textural features. In addition, the texture enhancement is quantitatively proven by a few Gray Level Co-occurrence Matrix (GLCM) measures, such as contrast, correlation, energy and homogeneity. Their % of Improvement is discussed in detail and the substantial improvement attained by the modified G-L FD operator over the basic G-L FD operator is well proved. (C) 2016 Ain Shams University.
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