Edge extraction of CT medical image based on wavelet transform algorithm

Xiaojun Wang; Xinzheng Li; Weidong Lai

doi:10.1117/12.902431

22 August 2011 Edge extraction of CT medical image based on wavelet transform algorithm

Xiaojun Wang, Xinzheng Li, Weidong Lai

Proceedings Volume 8192, International Symposium on Photoelectronic Detection and Imaging 2011: Laser Sensing and Imaging; and Biological and Medical Applications of Photonics Sensing and Imaging; 819256 (2011) https://doi.org/10.1117/12.902431
Event: International Symposium on Photoelectronic Detection and Imaging 2011, 2011, Beijing, China

Abstract

Since computer tomography (CT) image has been widely applied in clinic diagnostics, while for many applications the information directly provided by CT images is incomplete corrupted by noise or instrument defect, there has great demand to further the processing methods for improving the CT image quality. Among all image features, the edge profile of clinic focus has obvious influence on accurately translating CT image. In this paper, the wavelet filtering algorithm based on modulus maximum method is put forward to extract and enhance the CT image edges. Edges in the brain lobe CT image can be outlined after wavelet transform, during which the wavelet assigned as the first order derivative of Gauss function. Further manipulation through maximum threshold checking to the modulus have been attenuated the pseudo-edges. After segmented with the original CT image, the edge structure has been distinctly enhanced, and high contrast is achieved between the brain lobe microstructure and the artificially established edges. The proposed algorithm is more efficient than the common first order differential operator, for the latter it even deteriorates the edge features. The algorithm proposed in this article can be integrated in medical image analyzing software to obtain higher accuracy for symptom interpretation.

Citation Download Citation

Xiaojun Wang, Xinzheng Li, and Weidong Lai "Edge extraction of CT medical image based on wavelet transform algorithm", Proc. SPIE 8192, International Symposium on Photoelectronic Detection and Imaging 2011: Laser Sensing and Imaging; and Biological and Medical Applications of Photonics Sensing and Imaging, 819256 (22 August 2011); https://doi.org/10.1117/12.902431

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KEYWORDS

Image segmentation

Computed tomography

Wavelets

Medical imaging

Image enhancement

Wavelet transforms

Brain

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