Spectral Sensitivity Estimation with an Uncalibrated Diffraction Grating
- URL: http://arxiv.org/abs/2508.00330v1
- Date: Fri, 01 Aug 2025 05:34:08 GMT
- Title: Spectral Sensitivity Estimation with an Uncalibrated Diffraction Grating
- Authors: Lilika Makabe, Hiroaki Santo, Fumio Okura, Michael S. Brown, Yasuyuki Matsushita,
- Abstract summary: This paper introduces a practical and accurate calibration method for camera spectral sensitivity using a diffraction grating.<n>By capturing images of the direct illumination and its diffracted pattern through the grating sheet, our method estimates both the camera spectral sensitivity and the diffraction grating parameters in a closed-form manner.
- Score: 43.88110489893259
- License: http://creativecommons.org/licenses/by-nc-nd/4.0/
- Abstract: This paper introduces a practical and accurate calibration method for camera spectral sensitivity using a diffraction grating. Accurate calibration of camera spectral sensitivity is crucial for various computer vision tasks, including color correction, illumination estimation, and material analysis. Unlike existing approaches that require specialized narrow-band filters or reference targets with known spectral reflectances, our method only requires an uncalibrated diffraction grating sheet, readily available off-the-shelf. By capturing images of the direct illumination and its diffracted pattern through the grating sheet, our method estimates both the camera spectral sensitivity and the diffraction grating parameters in a closed-form manner. Experiments on synthetic and real-world data demonstrate that our method outperforms conventional reference target-based methods, underscoring its effectiveness and practicality.
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