用普通衍射光栅实现相机光谱响应的精准校准
Spectral Sensitivity Estimation with an Uncalibrated Diffraction Grating
- 仅需未标定的衍射光栅，通过直射与衍射图像联合求解
- 在合成与真实数据上均优于传统参考靶标方法
- 适合无专业设备的科研与工业场景使用
本文提出一种实用且精确的相机光谱响应校准方法，利用衍射光栅实现。准确的相机光谱响应校准对色彩校正、光照估计和材质分析等计算机视觉任务至关重要。与以往依赖专用窄带滤光片或已知光谱反射率参考靶标的方案不同，本方法仅需一张市售的未标定衍射光栅片。通过拍摄光栅下的直射光与衍射图案图像，该方法以闭式解形式同时估计相机光谱响应与光栅参数。在合成与真实数据上的实验表明，本方法性能优于传统参考靶标法，验证了其有效性和实用性。
原文摘要 · Abstract (English)
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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