L.C. Kiong et al. (Eds.): ICONIP 2014, Part III, LNCS 8836, pp. 276–283, 2014. © Springer International Publishing Switzerland 2014 Image Enhancement Using Geometric Mean Filter and Gamma Correction for WCE Images Shipra Suman 1 , Fawnizu Azmadi Hussin 1 , Aamir Saeed Malik 1 , Nicolas Walter 1 , Khean Lee Goh 2 , Ida Hilmi 2 , and Shiaw hooi Ho 2 1 Electrical and Electronic Engineering, Universiti Teknologi PETRONAS, 31750 Tronoh, Perak, Malaysia 2 Department of Medicine, university of Malaya, 50603, Kuala Lumpur, Malaysia suman.shipra@ieee.org,{fawnizu,aamir_saeed}@petronas.com.my, {walter.nicolas.pro,klgoh56}@gmail.com, i_hilmi@um.edu.my, shooiho@yahoo.com Abstract. The application of image enhancement technology to Wireless capsule Endoscopy (WCE) could extremely boost its diagnostic yield. WCE based detection inside gastrointestinal tract has been carried out over a great ex- tent for the seek of the presence of any kind of etiology. However, the quality of acquired images during endoscopy degraded due to factors such as environmen- tal darkness and noise. Hence, decrease in quality also resulted into poor sensi- tivity and specificity of ulcer and diagnosis. In this paper, a method based on color image enhancement through geometric mean filter and gamma correction is proposed. The developed method used geometric mean filtering to reduce Gaussian noise present in WCE images and achieved better quality images in contrast to arithmetic mean filtering, which has blurring effect after filtration. Moreover, Gamma correction has been applied to enhance small details, texture and contrast of the images. The results shown improved images quality in terms of SNR (Signal to Noise Ratio) and PSNR (Peak Signal to Noise Ratio) which is beneficial for automatic detection of diseases and aids clinicians to better vi- sualize images and ease the diagnosis. Keywords: Wireless capsule endoscopy (WCE), image enhancement, geome- trical means filter, gamma correction. 1 Introduction Wireless Capsule Endoscopy (WCE) is a recent technique (approved by Food and Drug Administration (FDA) in 2002)[1] that allows clinicians to inspect gastrointestin- al (GI) tract. Earlier imaging modalities such as upper gastrointestinal endoscopy, co- lonoscopy, and push enteroscopy allowed examining the stomach, duodenum, colon and terminal ileum. However, these techniques are long procedures as they require preparation of the patient and are painful. Moreover, most of small intestinal parts could not be observed without performing surgery that is invasive [2, 3]. In 2000, a short paper published in nature [4] introduced an advanced form of endoscopy,