Spectral Sensitivity Estimation with an Uncalibrated Diffraction Grating
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arXiv
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| Main Authors: | , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866911086888878080 |
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| author | Makabe, Lilika Santo, Hiroaki Okura, Fumio Brown, Michael S. Matsushita, Yasuyuki |
| author_facet | Makabe, Lilika Santo, Hiroaki Okura, Fumio Brown, Michael S. Matsushita, Yasuyuki |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_00330 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Spectral Sensitivity Estimation with an Uncalibrated Diffraction Grating Makabe, Lilika Santo, Hiroaki Okura, Fumio Brown, Michael S. Matsushita, Yasuyuki Computer Vision and Pattern Recognition 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. |
| title | Spectral Sensitivity Estimation with an Uncalibrated Diffraction Grating |
| topic | Computer Vision and Pattern Recognition |
| url | https://arxiv.org/abs/2508.00330 |