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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.
This article was published in the following journal.
Name: IEEE transactions on visualization and computer graphics
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A pinkish-yellow portion of the midbrain situated in the rostral mesencephalic tegmentum. It receives a large projection from the contralateral half of the CEREBELLUM via the superior cerebellar peduncle and a projection from the ipsilateral MOTOR CORTEX.
The prediction or projection of the nature of future problems or existing conditions based upon the extrapolation or interpretation of existing scientific data or by the application of scientific methodology.
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Groups of individuals whose putative ancestry is from native continental populations based on similarities in physical appearance.
Validation of the sex of an individual by means of the bones of the SKELETON. It is most commonly based on the appearance of the PELVIS; SKULL; STERNUM; and/or long bones.