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Edge detection for noisy image  

Koo, Yun Mo (명지전문대학 컴퓨터정보과과)
Kim, Young Ro (명지전문대학 컴퓨터정보과과)
Publication Information
Journal of Korea Society of Digital Industry and Information Management / v.8, no.3, 2012 , pp. 41-48 More about this Journal
Abstract
In this paper, we propose a method of edge detection for noisy image. The proposed method uses a progressive filter for noise reduction and a Sobel operator for edge detection. The progressive filter combines a median filter and a modified rational filter. The proposed method for noise reduction adjusts rational filter direction according to an edge in the image which is obtained by median filtering. Our method effectively attenuates the noise while preserving the image details. Edge detection is performed by a Sobel operator. This operator can be implemented by integer operation and is therefore relatively fast. Our proposed method not only preserves edge, but also reduces noise in uniform region. Thus, edge detection is well performed. Our proposed method could improve results using further developed Sobel operator. Experimental results show that our proposed method has better edge detection with correct positions than those by existing median and rational filtering methods for noisy image.
Keywords
Edge Detection; Progressive; Rational Filter; Median Filter; Noise Reduction;
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