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首页> 外文会议>2014 IEEE Conference on Biomedical Engineering and Sciences >Pre-processing technique based on discrete cosine transform (DCT) and anisotropic contrast diffusion for wireless capsule endoscopy images
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Pre-processing technique based on discrete cosine transform (DCT) and anisotropic contrast diffusion for wireless capsule endoscopy images

机译：基于离散余弦变换（DCT）和各向异性对比度扩散的无线胶囊内窥镜图像预处理技术

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摘要

Wireless capsule endoscopy (WCE) is useful to detect abnormal area in human digestive tract. However, many WCE images have low quality such as rather dark and noisy. Pre-processing is an important step in Computer Aided Detection (CAD) system to enhance the quality of WCE images in order to detect the abnormalities easier. To further enhance the image quality, anisotropic diffusion with Hessian matrix proposed by B. Li is applied to get contrast the image. However, this method still has weakness where an image is not sharp. To overcome this problem, Discrete Cosine Transform (DCT) is employed with anisotropic contrast diffusion in our proposed scheme. Experimental results of the proposed method are also presented in this paper.
机译：无线胶囊内窥镜检查（WCE）可用于检测人体消化道的异常区域。但是，许多WCE图像的质量较低，例如较暗且嘈杂。预处理是计算机辅助检测（CAD）系统中提高WCE图像质量以便更容易检测异常的重要步骤。为了进一步提高图像质量，应用了B. Li提出的具有Hessian矩阵的各向异性扩散来获得图像对比度。但是，这种方法仍然存在图像不清晰的缺点。为了克服这个问题，在我们提出的方案中采用了离散余弦变换（DCT）和各向异性对比扩散。本文还介绍了该方法的实验结果。

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