Robust Reflectance Estimation for Projection-Based Appearance Control in a Dynamic Light Environment

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Published
2019-09-10
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journal article
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  • c 2019 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
DOI
  • 10.1109/tvcg.2019.2940453
Publisher
IEEE

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We present a novel method for robustly estimating reflectance even in a dynamically changing light environment. To control the appearance of an object by using a projector-camera system, appropriate reflectance estimation is vital to the creation of an appropriate projection image. Most conventional estimation methods have assumed a static light condition although, in practice, the appearance is affected not only by the reflectance but also by the environmental light. In a dynamically changing light environment, conventional methods must be capable of applying calibrations every time the conditions change. Our method is based on a concept of creating two different light conditions by switching the projection at a rate that is higher than what the human eye can perceive, capturing images of a target object separately under each condition. Our method simultaneously estimates the reflectance and environmental light by using a pair of images acquired under two conditions. We implemented a projector-camera system that switches the projection on and off at 120 Hz. We conducted two experiments to confirm the robustness when changing the brightness and the color saturation of the environmental light, respectively. The results indicated our method is capable of robustly estimating the reflectance under practical indoor lighting conditions.

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