Abstract
This paper presents a review study on binarization of gray images. Binarization is a technique by which an image is converted into bits. It is an important step in most document image analysis systems. Since a digital image is a set of pixels. Many binarization techniques have a definite intensity value for each pixel. A gray image is just an image which has each pixel of same intensity. That means there is not much difference in color or value information of pixels. Usually, a picture in black and white is considered as gray image in which black has least intensity and white have highest.
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