Capsule Endoscopy Image Enhancement for Small Intestinal Villi Clarity
This work addresses a domain-specific problem for medical imaging in gastroenterology, offering an incremental improvement over prior WCE image enhancement techniques.
The paper tackles the problem of enhancing small intestinal villi clarity in Wireless Capsule Endoscopy images by developing an adaptive sharpening method that uses guided filtering and gain factors, resulting in improved edge details and suppressed noise amplification compared to existing methods.
This paper presents, for the first time, an image enhancement methodology designed to enhance the clarity of small intestinal villi in Wireless Capsule Endoscopy (WCE) images. This method first separates the low-frequency and high-frequency components of small intestinal villi images using guided filtering. Subsequently, an adaptive light gain factor is generated based on the low-frequency component, and an adaptive gradient gain factor is derived from the convolution results of the Laplacian operator in different regions of small intestinal villi images. The obtained light gain factor and gradient gain factor are then combined to enhance the high-frequency components. Finally, the enhanced high-frequency component is fused with the original image to achieve adaptive sharpening of the edges of WCE small intestinal villi images. The experiments affirm that, compared to established WCE image enhancement methods, our approach not only accentuates the edge details of WCE small intestine villi images but also skillfully suppresses noise amplification, thereby preventing the occurrence of edge overshooting.