Browsing by Author "Igarashi, Takeo"

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    Data-guided Authoring of Procedural Models of Shapes
    (The Eurographics Association and John Wiley & Sons Ltd., 2023) Hossain, Ishtiaque; Shen, I-Chao; Igarashi, Takeo; Kaick, Oliver van; Chaine, Raphaëlle; Deng, Zhigang; Kim, Min H.
    Procedural models enable the generation of a large amount of diverse shapes by varying the parameters of the model. However, writing a procedural model for replicating a collection of reference shapes is difficult, requiring much inspection of the original and replicated shapes during the development of the model. In this paper, we introduce a data-guided method for aiding a programmer in creating a procedural model to replicate a collection of reference shapes. The user starts by writing an initial procedural model, and the system automatically predicts the model parameters for reference shapes, also grouping shapes by how well they are approximated by the current procedural model. The user can then update the procedural model based on the given feedback and iterate the process. Our system thus automates the tedious process of discovering the parameters that replicate reference shapes, allowing the programmer to focus on designing the high-level rules that generate the shapes. We demonstrate through qualitative examples and a user study that our method is able to speed up the development time for creating procedural models of 2D and 3D man-made shapes.
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    Interactive Deformable Image Registration with Dual Cursor
    (The Eurographics Association, 2022) Igarashi, Takeo; Koike, Tsukasa; Kin, Taichi; Yang, Yin; Parakkat, Amal D.; Deng, Bailin; Noh, Seung-Tak
    Deformable image registration is the process of deforming a target image to match corresponding features of a reference image. Fully automatic registration remains difficult; thus, manual registration is dominant in practice. In manual registration, an expert user specifies a set of paired landmarks on the two images; subsequently, the system deforms the target image to match each landmark with its counterpart as a batch process. However, the deformation results are difficult for the user to predict, and moving the cursor back and forth between the two images is time-consuming. To improve the efficiency of this manual process, we propose an interactive method wherein the deformation results are continuously displayed as the user clicks and drags each landmark. Additionally, the system displays two cursors, one on the target image and the other on the reference image, to reduce the amount of mouse movement required. The results of a user study reveal that the proposed interactive method achieves higher accuracy and faster task completion compared to traditional batch landmark placement.