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Abstract
Image enhancing is a needed process for improving the quality of the image so that it can be used in various applications and appliances. Today, many things are based on the visual representation, the image and a good image has a good use. Histogram equalization is a technique used for obtaining an image that has enhanced contrast. This method is used for images which has over contrast and under contrast regions as it increases the total contrast of the image by equalizing the histogram of the image. It does so by spreading out most frequent intensity values. It can be used to increase the X-ray contrast containing the bone structure and for enhancing under or over exposed photographs. The drawback of this method is that it changes the brightness of the resulting image creating problems while used in an electrical appliance such as television. To overcome this problem and several other problems during the contrast enhancing process, many have come up with their idea of approach which gives good results as well as some variations in some situations. In this paper, we have discussed the proposals of various authors for enhancing the image that is not proper without altering the other important characteristics of it. The proposed methods are proven to be successful under most conditions.