Thresholding technique is effective for images based on
objects of contrast background. In thresholding technique,
each pixel in images are separates into foreground (binary
“1”) and background (binary “0”) object of classes based
upon their correspondence in gray level intensity. The gray
scale image is converted into binary image using Otsu
method. The drawback of thresholding is not always straight
forward and assigned pixels to a single class. It need not form
coherent regions as the spatial locations of pixels and
completely ignored [11].