Sang Woo Kim

Publications

5 Automated Inspection Algorithm for Thick Plate Using Dual Light Switching Lighting Method

Authors: Jong Pil Yun, Sang Woo Kim, Yong-JuJeon, Doo-chul Choi, Changhyun Park, Homoon Bae

Abstract:

This paper presents an automated inspection algorithm for a thick plate. Thick plates typically have various types of surface defects, such as scabs, scratches, and roller marks. These defects have individual characteristics including brightness and shape. Therefore, it is not simple to detect all the defects. In order to solve these problems and to detect defects more effectively, we propose a dual light switching lighting method and a defect detection algorithm based on Gabor filters.

Keywords: Inspection, defect, Gabor filter, thick plate, Dual Light Switching

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4 An Algorithm for Detecting Seam Cracks in Steel Plates

Authors: Sung Wook Yun, Jong Pil Yun, Sang Woo Kim, Doo-chul Choi, Yong-Ju Jeon

Abstract:

In this study, we developed an algorithm for detecting seam cracks in a steel plate. Seam cracks are generated in the edge region of a steel plate. We used the Gabor filter and an adaptive double threshold method to detect them. To reduce the number of pseudo defects, features based on the shape of seam cracks were used. To evaluate the performance of the proposed algorithm, we tested 989 images with seam cracks and 9470 defect-free images. Experimental results show that the proposed algorithm is suitable for detecting seam cracks. However, it should be improved to increase the true positive rate.

Keywords: Machine Vision, Defect Detection, Gabor filter, surface inspection

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3 Implementation of IEEE 802.15.4 Packet Analyzer

Authors: Sang Woo Kim, ChangWoo Lee, Sung Jun Ban, Hyeonwoo Cho

Abstract:

A packet analyzer is a tool for debugging sensor network systems and is convenient for developers. In this paper, we introduce a new packet analyzer based on an embedded system. The proposed packet analyzer is compatible with IEEE 802.15.4, which is suitable for the wireless communication standard for sensor networks, and is available for remote control by adopting a server-client scheme based on the Ethernet interface. To confirm the operations of the packet analyzer, we have developed two types of sensor nodes based on PIC4620 and ATmega128L microprocessors and tested the functions of the proposed packet analyzer by obtaining the packets from the sensor nodes.

Keywords: Embedded system, Sensor Network, packet analyzer

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2 Real-Time Defects Detection Algorithm for High-Speed Steel Bar in Coil

Authors: Se Ho Choi, Jong Pil Yun, Boyeul Seo, YoungSu Park, Sang Woo Kim

Abstract:

This paper presents a real-time defect detection algorithm for high-speed steel bar in coil. Because the target speed is very high, proposed algorithm should process quickly the large volumes of image for real-time processing. Therefore, defect detection algorithm should satisfy two conflicting requirements of reducing the processing time and improving the efficiency of defect detection. To enhance performance of detection, edge preserving method is suggested for noise reduction of target image. Finally, experiment results show that the proposed algorithm guarantees the condition of the real-time processing and accuracy of detection.

Keywords: Defect Detection, edge preserving filter, real-time image processing, surface inspection

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1 Affine Projection Algorithm with Variable Data-Reuse Factor

Authors: Sang Woo Kim, ChangWoo Lee, Young Kow Lee, Sung Jun Ban, SungHoo Choi

Abstract:

This paper suggests a new Affine Projection (AP) algorithm with variable data-reuse factor using the condition number as a decision factor. To reduce computational burden, we adopt a recently reported technique which estimates the condition number of an input data matrix. Several simulations show that the new algorithm has better performance than that of the conventional AP algorithm.

Keywords: condition number, misalignment, convergence rate, affine projection algorithm, variable data-reuse factor

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