Implementation of Universal Image Quality Index (UIQI) on Halftoned Images

Halftoning, the transformation from grayscale images into dual-tone binary images. An image having several bits for brightness levels is converted into a binary image consisting of black and white dots which looks similar to an input image. Halftoning is the process of converting continuous-tone images into strictly black and white images such that, when viewed by the human visual system, the pattern creates an illusion of being a continuous shade of gray.. The quality of a halftone image cannot be judge before it is reproduced. In this paper, Universal Image Quality Index (UIQI) is implemented as performance parameter on Halftoned images which depends on luminance, contrast, covariance and structural comparison attributes.