Jonghoon Seo

AR Lamp: interactions on projection-based augmented reality for interactive learning

Today, people use a computer almost everywhere. At the same time, they still do their work in the old-fashioned way, such as using a pen and paper. A pen is often used in many fields because it is easy to use and familiar. On the other hand, however, it is a quite inconvenient because the information printed on paper is static. If digital features are added to this paper environment, the users can do their work more easily and efficiently. AR (augmented reality) Lamp is a stand-type projector and camera embedded system with the form factor of a desk lamp. Its users can modify the virtually augmented content on top of the paper with seamlessly combined virtual and physical worlds. AR is quite appealing, but it is difficult to popularize due to the lack of interaction. In this paper, the interaction methods that people can use easily and intuitively are focused on. A high-fidelity prototype of the system is presented, and a set of novel interactions is demonstrated. A pilot evaluation of the system is also reported to explore its usage possibility.

Interactive features based augmented reality authoring tool

This paper intends to propose an authoring tool system that allows users to easily create augmented reality content with the application of marker based and gesture interactions. It is possible to generate a simplified form of marker based augmented reality content with the user interface by using Kinect that enables gesture interaction. We seek to provide methods for the user to actively interact with augmented reality content. The interaction method we put forth in this study is a gesture interaction approach capable of Transfer, Rotate, Enlarge, and Shrink an object by recognizing and tracking the users bare hand. As for marker based interaction methods, there is one employing two markers and another using marker occlusion. We ascertain the positive results of this study from the user evaluation of an authoring tool system and marker based and gesture interactions.

Fast Contour-Tracing Algorithm Based on a Pixel-Following Method for Image Sensors

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.

AR pen and hand gestures: a new tool for pen drawings

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.

Enhancing marker-based AR technology

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.

Imaged based codes performance comparison for mobile environments

By spreading of smart phones, mobile barcodes are used widely. However, there are so many 2D barcodes to be available. So, it is important to compare those mobile barcodes. In this paper we performed decoding performance comparison between popular mobile barcodes. ColorCode is using color information to get information. So it shows most improved performance in distance and size. Also, it can provide magnifying decoding mode, and it shows more enhancing result.

MSL_AR toolkit: AR authoring tool with interactive features

We describe an authoring tool for Augmented Reality (AR) contents. In recent years there have been a number of frameworks proposed for developing Augmented Reality (AR) applications. This paper describes an authoring tool for Augmented Reality (AR) application with interactive features. We developed the AR authoring tool which provides Interactive features that we can perform the education service project and participate it actively for the participating education service. In this paper, we describe MSL_AR Authoring tool process and two kinds of interactive features.

ColorCodeAR: Large identifiable ColorCode-based augmented reality system

Augmented reality (AR) is widely used in various applications of computer vision, such as marker-based AR and markerless-based AR. These AR techniques are used in various fields, including industry, education, and medicine. Using marker-based AR, employees can easily perform step-by-step maintenance and repairs, and they can register parts information for large plants. However, conventional marker-based AR relies on a relatively small number of recognizable IDs compared to barcode markers. In this paper, to address the insufficient identification volume in conventional AR systems, we integrate barcode-based code technology with marker-based AR technology. Based on the results of an experiment, we applied ColorCode to our marker-based AR system. Nevertheless, difficulties arise when applying ColorCode to an AR system, owing to its recognition distance and relatively small size, compared to other AR codes. In this paper, therefore, we complemented quad detection with a tracking technique for various angles and distances, facilitating reliable recognition of the color-code-based AR system, Moreover, we added a tracking module to address the systems failure to detect markers. The experimental results demonstrate that the proposed system offers stable recognition.

LaserTouch: touch device control using a laser pointer

The touch device has widely been used because of its advantage of intuitive control, and a variety of applications that utilize them are currently being developed. In addition, it is being used in various fields as devices in the form of smartphone and pad are released, and the increasing user needs for touch devices raised the need to conduct studies on the remote control of touch devices. However, since touch devices do not have a separate controller, we can control the device only by users direct touch. So it is inconvenient when watching videos with a device on the holder, or controlling contents on a large table-top environment.

Meet researcher in the real world using the ConAR: context-aware researcher

In this paper, we focused on a research on a Location-Based Social Network Service to increase social interactions among people who are engaging in research and development. Since existing many of location-based social network services have only provided information of regions and social relations of users have targeted an unspecific majority of groups, they could not have active interactions, compared to users of online communities who have particular use purposes. ConAR what we designed to get over these weaknesses, aims at researches to academically exchange with others and it enables them to have social interactions with people of the same interests by helping them select discussion topics and decide assignment places simply and on impulse.