Towards a true spherical camera
Towards a true spherical camera
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迈向真正的球形相机
DOI：
10.1117/12.817149
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发表时间：
2009
影响因子：
5.2
通讯作者：
S. Nayar
中科院分区：
文献类型：
--
作者：
Gurunandan Krishnan;S. Nayar
我们设计了一种具有以下特性的球形成像系统：(i)一个4π的视场，使其能够“看到”所有方向；（ii）单一投影中心，以避免视场内的视差；（iii）均匀的空间和角度分辨率，以实现视场的均匀采样。我们的设计包括一个球形（球）镜头封装在一个球形探测器外壳。探测器外壳具有传感元件均匀分布，但相邻元件之间有自由空间，从而使探测器对光部分透明。我们确定了产生最紧凑的点扩展函数的传感元件的最佳尺寸和探测器外壳的直径。用这种相机捕获的图像具有最小的模糊，可以使用球面反褶积去模糊。目前的固态技术不允许制造高分辨率的球形探测器阵列。因此，为了验证我们的设计，我们构建了一个带有单个传感元件的球形相机原型，它可以一次扫描一个球形图像。
We present the design of a spherical imaging system with the following properties: (i) A 4π field of view that enables it to "see" in all directions; (ii) a single center of projection to avoid parallax within the field of view; and (iii) a uniform spatial and angular resolution in order to achieve a uniform sampling of the field of view. Our design consists of a spherical (ball) lens encased within a spherical detector shell. The detector shell has a uniform distribution of sensing elements, but with free space between neighboring elements, thereby making the detector partly transparent to light. We determine the optimal dimensions of the sensing elements and the diameter of the detector shell that produce the most compact point spread function. The image captured with such a camera has minimal blur and can be deblurred using spherical deconvolution. Current solid state technologies do not permit the fabrication of a high resolution spherical detector array. Therefore, in order to verify our design, we have built a prototype spherical camera with a single sensing element, which can scan a spherical image one pixel at a time.