An Alpha Rooting Based Hybrid Technique for Image Enhancement
R. Arun, Prof. (Dr.) Madhu S. Nair, R. Vrinthavani, Rao Tatavarti · 2011
The conventional transform domain image enhancement technique of alpha rooting has long been used for enhancing high contrast edge information and sharp features in images. However the alpha rooting technique is constrained by problems like overall graying, tonal changes and noisy artifacts. This paper explores a new method by which alpha rooting can be used for enhancing even low contrast images. In this paper we advocate complementing the transform domain technique with appropriate spatial domain techniques to eliminate the limitations of the conventional transform domain technique, thus improving the image enhancement process. We suggest an alpha rooting based Hybrid Technique by combining the gray level transformation algorithms, such as logarithmic transform and power law transform, with alpha rooting algorithm for contrast enhancement. The new technique which ensures control over the contrast of the image to the desired degree is inherently simple in theory and implementation and is well suited for enhancement of a variety of images.