Browsing by Author "Amano, Toshiyuki"

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    Analyzing the Behavior of Projector-Camera Systems Based on Reaction-Diffusion Equations
    (The Eurographics Association, 2023) Amano, Toshiyuki; Jean-Marie Normand; Maki Sugimoto; Veronica Sundstedt
    Pixel Feedback Animation (PFA), a technique that uses projector-camera feedback, has emerged as a dynamic illumination method introducing variations in color and brightness for expressive purposes. Notably, the deliberate application of specific image processing techniques during the projector-camera feedback loop has unveiled the potential to generate patterns reminiscent of Turing patterns solutions to reaction-diffusion equations. However, the intrinsic nature of PFA's projection-camera system consists of image capture and reflective properties of the projection surface, which create illumination patterns. In this paper, a comprehensive investigation into the underlying mechanisms of PFA is presented, revealing its inherent connection to reaction-diffusion systems. The study explores the emergence of distinct PFA patterns intricately influenced by variations in object surface reflectivity and coloration.
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    Cast-Shadow Removal for Cooperative Adaptive Appearance Manipulation
    (The Eurographics Association, 2022) Uesaka, Shoko; Amano, Toshiyuki; Hideaki Uchiyama; Jean-Marie Normand
    We propose a framework to suppress over-illumination at the overlapping area created by cooperative adaptive appearance manipulation with independently working two projector-camera systems. The proposed method estimates projection overlapping in each projector-camera unit with neither geometrical mapping nor projection image sharing. Then, the method suppresses the projection illumination of the overlapping area by compensated reflectance estimation. Experimental results using two projector-camera systems confirm that the proposed method correctly detects overlapping areas adaptively and removes cast shadows that cause uneven illumination owing to cooperative appearance manipulation of a moving 3D target.
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    Gaze Guidance in the Real-world by Changing Color Saturation of Objects
    (The Eurographics Association, 2022) Miyamoto, Junpei; Koike, Hideki; Amano, Toshiyuki; Hideaki Uchiyama; Jean-Marie Normand
    In this study, we propose a method for real-world gaze guidance by projecting an image onto a real-world object and changing its appearance based on visual saliency. In the proposed method, an image of the object is first acquired. Next, the image is changed such that the visual prominence of the object is increased and the image is changed so that the visual prominence of other parts of the object is decreased. Finally, the modified image is re-projected onto the object itself. Consequently, the object's appearance and visual prominence are altered, and the user's gaze is focused on the desired object. In this study, we propose an image processing method that changes the saturation of an object. We call this the "saturation filter." A coaxial projector-camera system was used to apply the proposed gaze guidance method proposed in this study to a 3D object. The coaxial projector-camera system does not need to be recalibrated when an object moves. In this study, two experiments were conducted to verify the effectiveness of the proposed method in guiding a viewer's gaze. As a result, it was confirmed that the proposed method can achieve the effect of gaze guidance.
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    Materiality Manipulation by Light-Field Projection from Reflectance Analysis
    (The Eurographics Association, 2018) Murakami, Kouki; Amano, Toshiyuki; Bruder, Gerd and Yoshimoto, Shunsuke and Cobb, Sue
    In this paper, we report a method for changing the appearance of an object to different colors as a function of viewing perspective with multiple projectors and cameras. If such appearance manipulation becomes possible, morpho butterfly colors, metallic reflection, and other structural colors can be expressed. For such appearance editing, we proposed a reflection model which describes the optical response of projectors and cameras. We also propose methods for calculating the reflectance matrix and the optimized projection images using non-negative minimization. Through experimental results, we confirmed our method allowed perspective-dependent appearance to be designed by choosing the appropriate reflectance from the non-Lambert reflection area.
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    Projection Alignment Correction for In-Vehicle Projector-Camera System
    (The Eurographics Association, 2021) Amano, Toshiyuki; Kagawa, Taichi; Orlosky, Jason and Reiners, Dirk and Weyers, Benjamin
    In this study, we propose a projection registration method for the projections from a continuously moving vehicle for driver vision assistance during night driving. Accordingly, we employ a context-aware projection technique with adaptive pixel map- ping generation. Because vehicle movements lead to misalignment of the projection latency, a co-axial projector-camera con- figuration or high frame rate processing cannot solve this problem. However, adaptive pixel mapping corrects pixel mapping according to the vehicle speed and achieves a misalignment-free dynamic projection mapping. The effectiveness of the proposed method was evaluated through experiments using a moving projector-camera system mounted on a motorized linear stage.