Contour pixels distinguish objects from the background. Tracing and extracting contour pixels are widely used for smart/wearable image sensor devices, because these are simple and useful for detecting objects. In this paper, we present a novel contour-tracing algorithm for fast and accurate contour following. The proposed algorithm classifies the type of contour pixel, based on its local pattern. Then, it traces the next contour using the previous pixel’s type. Therefore, it can classify the type of contour pixels as a straight line, inner corner, outer corner and inner-outer corner, and it can extract pixels of a specific contour type. Moreover, it can trace contour pixels rapidly because it can determine the local minimal path using the contour case. In addition, the proposed algorithm is capable of the compressing data of contour pixels using the representative points and inner-outer corner points, and it can accurately restore the contour image from the data. To compare the performance of the proposed algorithm to that of conventional techniques, we measure their processing time and accuracy. In the experimental results, the proposed algorithm shows better performance compared to the others. Furthermore, it can provide the compressed data of contour pixels and restore them accurately, including the inner-outer corner, which cannot be restored using conventional algorithms.

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In this paper, we propose a method that solves both jittering and occlusion problems which is the biggest issue in marker based augmented reality technology. Because we adjust the pose estimation by using multiple keypoints that exist in the marker based on cells, we can predict the strong pose on jittering. Additionally, we can solve the occlusion problem by applying tracking technology.

This paper explores the interaction possibilities when artists use their non-dominant hand, while drawing with a pen in their dominant hand. We propose a new interactive AR-based pen tool which can overlay virtual images onto a physical drawing in real time. This system allows artists to control the augmented images with gestures of a non-dominant hand while drawing. By interacting with the visually augmented contents using hand gestures and a pen bimanually, artists can draw pictures more creatively. We also made a standalone pen system integrated with a pico-projector and a camera, and suggest a set of useful scenarios for the conventional pen-and-paper drawing.