Ji-yong Kwon

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Universidad Tecnologica Metropolitana

George F Bass

Texas A&M University

MIGUEL ANGEL ARJONA FAJARDO

Universidad Nacional Mayor de San Marcos

Samuel Tavoletti

Mounir BELLOUMI

Najran University

IFTAHUL MEILIDIA

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Papers by Ji-yong Kwon

Perceptual Motion Feature Analysis and Its Applications

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Non-Photorealistic Rendering for Wrinkles of Clothes

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Perception and Optimization-based Level of Motion Details for Forward Kinematics Simplification

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CartoonModes: Cartoon stylization of video objects through modal analysis

Graphical Models, 2012

We transform the motion and shape of a video object into cartoon style using a set of representat... more

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Stereoscopic line drawing using depth maps

ACM SIGGRAPH 2012 Posters on - SIGGRAPH '12, 2012

Figure 1: (a) Original Image (Left) (b) Stylized edge using Coherent Line Drawing (Left) (c) Warp... more

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Graphical interface for motion editing using procedure visualization

Science China Information Sciences, 2011

In this paper, we introduce an interface for motion editing that visualizes editing procedures. F... more In this paper, we introduce an interface for motion editing that visualizes editing procedures. For intuitive understanding and construction of motion editing procedures, our system represents an editing element that produces modified motion from a given input motion as a graphical node, and enables user to construct a whole motion editing procedure by connecting the nodes with a few mouse interactions. The system provides both the 3D transform manipulator and the time-line slider for intuitive controlling of the parameters of each node. The user evaluation results show that our system is easy and intuitive to be used by users for editing of motion sequences.

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Cartoon-Like Stylization for Character Animation

2011 International Symposium on Ubiquitous Virtual Reality, 2011

Abstract Three different types of cartoon-like stylization methods are introduced. First, we intr... more

Video composition using geodesic distance

SIGGRAPH Asia 2011 Posters on - SA '11, 2011

Figure 1: Example of geodesic distances and our composition weights: (a) source video, (b) trimap... more Figure 1: Example of geodesic distances and our composition weights: (a) source video, (b) trimap, (c) geodesic distance map (the red channel is D b , and the blue channel is D f), (d) the weights used in our composition (the red channel is the foreground weight, the blue channel is the background weight, and the green channel is the secondary foreground weight), (e) result produced by the Rotobrush, and (f) result produced by our method.

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Development ofWeb3D-based Virtual Reality System for Hydrogen Station

Journal of the Korea Computer Graphics Society, 2009

In this paper, we present the web3D-based virtual reality(VR) system for the safety education of ... more In this paper, we present the web3D-based virtual reality(VR) system for the safety education of the hydrogen station. Currently, hydrogen is considered the next generation energy, and hydrogen station is a part of core infrastructure in hydrogen industry. However, the experience of safety equipment in the hydrogen station is limited to the non-experts, because it is a restricted area in general industry. Therefore, using the event driven method, we develop the VR system to transfer the information of hydrogen station to the non-experts. Using our system, user experiences the safety concerns in the hydrogen station, and also learn the informations of hydrogen energy.

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Video composition using geodesic distance

Video composition is an indispensable technique in the production of many types of videos; nevert... more Video composition is an indispensable technique in the production of many types of videos; nevertheless, it remains challenging problem if the source video is normally captured without a blue or green screen, especially when the object to be pasted between videos does not have a clear boundary (e.g. water, gas, and fire). We will call such a region a secondary foreground, and we propose a simple composition method in which foreground, background, and secondary foreground weights are determined using a geodesic distance tramsform [Criminisi et al. 2010]. This method will run in real time, but is nevertheless able to produce convincing results with difficult secondary foregrounds.

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The Squash-and-Stretch Stylization for Character Motions

IEEE Transactions on Visualization and Computer Graphics, 2000

The squash-and-stretch describes the rigidity of the character. This effect is the most important... more The squash-and-stretch describes the rigidity of the character. This effect is the most important technique in traditional cartoon animation. In this paper, we introduce a method that applies the squash-and-stretch effect to character motion. Our method exaggerates the motion by sequentially applying the spatial exaggeration technique and the temporal exaggeration technique. The spatial exaggeration technique globally deforms the pose in order to make the squashed or stretched pose by modeling it as a covariance matrix of joint positions. Then, the temporal exaggeration technique computes a time-warping function for each joint, and applies it to the position of the joint allowing the character to stretch its links appropriately. The motion stylized by our method is a sequence of squashed and stretched poses with stretching limbs. By performing a user survey, we prove that the motion created using our method is similar to that used in 2D cartoon animation and is funnier than the original motion for human observers who are familiar with 2D cartoon animation.