Performance Analysis of Contrast Stretching Enhancement Techniques for Medical Images

Leukemia is a malignant disease (cancer) that affects people in any age either they are children or adults over 50 years old. Nowadays, there are screening system guidelines for leukemia patients. The screening result from looking at a sample of patient blood, can determine the abnormal levels of white blood cells, which may suggest leukemia for further diagnostic stage. Therefore, medical professional using medical images to diagnose leukemia. However, there are blur ness and effects of unwanted noise on blood leukemia images that sometimes result in false diagnosis. Thus image pre-processing such as image enhancement techniques are needed to improve this situation. This study proposes several contrast enhancement techniques which are local contrast stretching, global contrast stretching, partial contrast stretching, bright and dark contrast stretching. All these enhancement techniques are applied on the ALL (Acute Lymphocyclic Leukemia) images and AML (Acute Myelogenous Leukemia) images. Results are observed for several images. All the proposed image enhancement techniques are carried to find out best technique for enhancing the Acute Leukemia images. PSNR value is used to measure the performance of these techniques. Based on the results, the partial contrast stretching method is considered as the best technique that helps to improve quality of the image.