Spectral Sensitivity Estimation with an Uncalibrated Diffraction Grating
This provides a more practical solution for computer vision tasks like color correction and material analysis, though it is incremental as it builds on existing calibration needs.
The paper tackles the problem of camera spectral sensitivity calibration by introducing a method that uses an uncalibrated diffraction grating, eliminating the need for specialized equipment, and demonstrates superior performance over conventional methods in experiments.
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.