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首页> 外文会议>Algorithms and technologies for multispectral, hyperspectral, and ultraspectral imagery XX >Characterization of a compact 6-band multifunctional camera based on patterned spectral filters in the focal plane
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Characterization of a compact 6-band multifunctional camera based on patterned spectral filters in the focal plane

机译：基于焦平面中模式光谱滤波器的紧凑型6波段多功能相机的特性

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In some applications of multi- or hyperspectral imaging, it is important to have a compact sensor. The most compact spectral imaging sensors are based on spectral filtering in the focal plane. For hyperspectral imaging, it has been proposed to use a "linearly variable" bandpass filter in the focal plane, combined with scanning of the field of view. As the image of a given object in the scene moves across the field of view, it is observed through parts of the filter with varying center wavelength, and a complete spectrum can be assembled. However if the radiance received from the object varies with viewing angle, or with time, then the reconstructed spectrum will be distorted. We describe a camera design where this hyperspectral functionality is traded for multispectral imaging with better spectral integrity. Spectral distortion is minimized by using a patterned filter with 6 bands arranged close together, so that a scene object is seen by each spectral band in rapid succession and with minimal change in viewing angle. The set of 6 bands is repeated 4 times so that the spectral data can be checked for internal consistency. Still the total extent of the filter in the scan direction is small. Therefore the remainder of the image sensor can be used for conventional imaging with potential for using motion tracking and 3D reconstruction to support the spectral imaging function. We show detailed characterization of the point spread function of the camera, demonstrating the importance of such characterization as a basis for image reconstruction. A simplified image reconstruction based on feature-based image coregistration is shown to yield reasonable results. Elimination of spectral artifacts due to scene motion is demonstrated.
机译：在多光谱或高光谱成像的某些应用中，拥有紧凑的传感器非常重要。最紧凑的光谱成像传感器基于焦平面中的光谱过滤。对于高光谱成像，已经提出在焦平面中使用“线性可变”带通滤波器，并结合对视场的扫描。当场景中给定对象的图像在整个视场中移动时，可以通过滤光片中中心波长变化的部分进行观察，并可以组装完整的光谱。但是，如果从物体接收到的辐射度随视角或时间变化，则重建的光谱将失真。我们描述了一种相机设计，其中此高光谱功能被换成了具有更好光谱完整性的多光谱成像。通过使用具有紧密排列的6个波段的图案化滤光器，可将光谱失真降至最低，从而使每个光谱波段都能快速连续地观看场景物体，并且视角变化最小。 6个频段的集合重复4次，以便可以检查光谱数据的内部一致性。滤波器在扫描方向上的总范围仍然很小。因此，图像传感器的其余部分可用于常规成像，具有使用运动跟踪和3D重建以支持光谱成像功能的潜力。我们展示了相机的点扩展功能的详细特征，证明了这种特征作为图像重建基础的重要性。示出了基于基于特征的图像配准的简化图像重建以产生合理的结果。演示了消除因场景运动而引起的频谱伪影。

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