Keywords : contrast


Development of Traditional Algorithm Used in Denoising to Enhance Contrast of the Color Images

Hanan Ali; Esraa Abd Al-Majed; Asmaa Nadhim; Rahma Saleem

AL-Rafidain Journal of Computer Sciences and Mathematics, 2013, Volume 10, Issue 1, Pages 227-238
DOI: 10.33899/csmj.2013.163454

With the evolution of life and complexity there is a need to use the images in many scientific fields weather forecast, medical, engineering, and the fact that these images are a lot of distortion during capture due to the availability of cameras and Rate in abundance and in the hands of people who do not have enough experience in how to capture images in terms of quality lighting and distribution has become important use a variety of methods to improve these images show the best form of these methods and improve the image contrast (Contrast Enhancement).
In this research applied  traditional algorithm filter to improve the Adaptive Contrast Enhancement Global  Filter (ACE _mean) and has been the development of this algorithm to a new two Hybrid algorithms to improve the contrast Enhancement (Median Contrast Enhancement ACE_median) and the other algorithm is (Max & Min Contrast Enhancement ACE_max&min). the two hybrid algorithms obtained from merging two available methods, first is the traditional algorithm (ACE_mean)  with the second methods of another practice in improving the image is (Smoothing Images Enhancement) which is used to removing the noise from images .the results of each method were compared with the results of  other algorithms to show the best of them.
 

Applying Classical and Intelligence Techniques for Digital Image Contrast Enhancement

Alyaa taqi

AL-Rafidain Journal of Computer Sciences and Mathematics, 2008, Volume 5, Issue 2, Pages 135-158
DOI: 10.33899/csmj.2008.163990

Modern digital camera technology has produced huge services for the users from different ages and specifications .It made it easer to have images, but the user still needs to enhance those images, which have some problems when taken by the camera, for not applying enough light, as taking it in cloudy weather or on bright light or dark area or taking it from a far distance, all these reasons make the picture not clear having ambiguous details and colors. So, through this research we used some image contrast enhancement techniques to adjust the light for dark images, to make them have deep detail, sharp edges and better quality. Contrast problem is one of the most problems that face those who work on research field or normal users.
            The aim of this research is to improve the contrast of images that have bad contrast using both classical techniques and intelligence techniques. Among intelligence techniques we chose the fuzzy logic methods, to have images contain better colors all over the image and make the images look brighter. By studying the classical and fuzzy logic methods, we proposed a method named (Fuzzy Hyperbolic Threshold), the proposed method gave very good results. We applied the methods on gray, colored images and on a video, and used (Matlab 7) to implement those methods.