カメラ応答関数の自動校正を伴う照度差ステレオ

学位の種別: 課程博士審査委員会委員 : （主査）東京大学教授 相澤 清晴, 東京大学教授 佐藤 洋一, 国立情報学研究所教授 佐藤 真一, 東京大学准教授 大石 岳史, 東京大学准教授 山崎 俊彦University of Tokyo(東京大学

Radiometric calibration using temporal irradiance mixtures

We propose a new method for sampling camera response functions: temporally mixing two uncalibrated irradiances within a single camera exposure. Calibration methods rely on some known relationship between irradiance at the camera image plane and measured pixel intensities. Prior approaches use a color checker chart with known reflectances, registered images with different exposure ratios, or even the irradiance distribution along edges in images. We show that temporally blending irradiances allows us to densely sample the camera response function with known relative irradiances. Our first method computes the camera response curve using temporal mixtures of two pixel intensities on an uncalibrated computer display. The second approach makes use of temporal irradiance mixtures caused by motion blur. Both methods require only one input image, although more images can be used for improved robustness to noise or to cover more of the response curve. We show that our methods compute accurate response functions for a variety of cameras. 1