Images Enhancemcut By using the Histogram

An image histogram is a chart that shows the distribution of intensities in an image.The image histogram function creates plot by making n equally spaced bins each representing a range of data values, and then calculates the number of pixels within each range. Image enhancement that modifying the value of picture elements is a classical method for improving the visual perception . Many digital enhancement techniques have been used in order to optimize the visual quality of image for human or machine vision through histogram modifications. All these methods try to enhance the contrast of the input image without measuring the contrast itself. In this paper two histogram modification methods are introduced the first one (histogram stretching ) depending on the maximum and minmum brightness value in the image, while the second one (histogram equalization) depend on the re-arrange the brightness values in the image. The experimental results indicate that the images more brightness after applying the two enhancement methods and the quality of the processed images is measured subjectively