The raxel imaging model and ray-based calibration
The raxel imaging model and ray-based calibration
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DOI：
10.1023/b:visi.0000043754.56350.10
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发表时间：
2005-02-01
影响因子：
19.5
通讯作者：
Nayar, SK
中科院分区：
文献类型：
--
作者：
Grossberg, MD;Nayar, SK
成像模型提供场景中的点与图像中的点之间的对应关系的数学描述。主要的成像模型，透视投影，长期以来一直被用来描述传统的相机以及人眼。我们提出了一个成像模型，这是足够灵活的，以代表一个任意的成像系统。例如，使用这个模型，我们可以描述使用鱼眼镜头或复眼的系统，这违反了透视投影的假设。通过放宽透视投影的要求，我们给成像系统设计者更大的自由，以探索满足其他要求的系统，如紧凑的尺寸和宽视场。我们制定我们的模型注意到，所有的成像系统执行从传入的场景射线的图像检测器上的光敏元件的映射。这种映射可以方便地描述使用一组虚拟传感元件，称为raxel。Raxels包括几何、辐射和光学性质。我们提出了一种新的基于射线的标定方法，使用结构光图案提取任意成像系统的raxel参数。实验结果的透视以及非透视成像系统。
An imaging model provides a mathematical description of correspondence between points in a scene and in an image. The dominant imaging model, perspective projection, has long been used to describe traditional cameras as well as the human eye. We propose an imaging model which is flexible enough to represent an arbitrary imaging system. For example using this model we can describe systems using fisheye lenses or compound insect eyes, which violate the assumptions of perspective projection. By relaxing the requirements of perspective projection, we give imaging system designers greater freedom to explore systems which meet other requirements such as compact size and wide field of view. We formulate our model by noting that all imaging systems perform a mapping from incoming scene rays to photosensitive elements on the image detector. This mapping can be conveniently described using a set of virtual sensing elements, called raxels. Raxels include geometric, radiometric and optical properties. We present a novel ray based calibration method that uses structured light patterns to extract the raxel parameters of an arbitrary imaging system. Experiments' results for perspective as well as non-perspective imaging systems are included.