Youngjoon Han

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This paper proposes a new ellipse detection scheme using a Randomized Hough Transform (RHT) modified to use line segments. It detects line segments in an edge image and selects every pair of them to test whether they are pertained to the same ellipse of not using the RHT. If they pass the test, they are merged. Since the proposed algorithm uses line(More)
—This paper presents a robust vehicle detection approach using Haar-like feature. It is possible to get a strong edge feature from this Haar-like feature. Therefore it is very effective to remove the shadow of a vehicle on the road. And we can detect the boundary of vehicles accurately. In the paper, the vehicle detection algorithm can be divided into two(More)
For a method for enhancing an image, if it improves the quality enough or it nearly equals to the better method, the primary concern is the speed or the computational complexity and simplicity. Using global contrast stretching, low contrast image can be enhanced with an adjustable manner. Our method is based on a very simple algorithm. Its advantage is that(More)
A wearable guidance system is designed to provide context-dependent guidance messages to blind people while they traverse local pathways. The system is composed of three parts: moving scene analysis, walking context estimation and audio message delivery. The combination of a downward-pointing laser scanner and a camera is used to solve the challenging(More)