Programmable Aperture Camera Using LCoS
Programmable Aperture Camera Using LCoS
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DOI：
10.2197/ipsjtcva.4.1
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发表时间：
2010-09
期刊：
影响因子：
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通讯作者：
H. Nagahara;Changyin Zhou;Takuya Watanabe;H. Ishiguro;S. Nayar
中科院分区：
文献类型：
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作者：
H. Nagahara;Changyin Zhou;Takuya Watanabe;H. Ishiguro;S. Nayar
自 20 世纪 60 年代以来，光圈模式得到了广泛的研究，并针对各种应用提出了各种编码光圈，包括扩展景深、散焦去模糊、散焦深度、光场采集等。研究表明，由于不同的应用、成像条件或场景内容，最佳光圈模式可能有很大不同。此外，许多编码孔径技术需要在捕获期间暂时改变孔径图案。因此，通常需要有一个可编程光圈相机，其光圈图案可以根据需要动态改变，以便捕获更多有用的信息。在本文中，我们提出了一种使用硅基液晶（LCoS）器件的可编程孔径相机。这种设计提供了高亮度对比度和高分辨率孔径以及相对较低的光损失，并且能够以相当高的帧速率改变图案。我们构建了一个原型相机，并通过实验综合评估其特点和缺点。我们还演示了光场采集和散焦去模糊中的两种编码孔径应用。
Since 1960s, aperture patterns have been studied extensively and a variety of coded apertures have been proposed for various applications, including extended depth of field, defocus deblurring, depth from defocus, light field acquisition, etc. Researches have shown that optimal aperture patterns can be quite different due to different applications, imaging conditions, or scene contents. In addition, many coded aperture techniques require aperture patterns to be temporally changed during capturing. As a result, it is often necessary to have a programmable aperture camera whose aperture pattern can be dynamically changed as needed in order to capture more useful information. In this paper, we propose a programmable aperture camera using a Liquid Crystal on Silicon (LCoS) device. This design affords a high brightness contrast and high resolution aperture with a relatively low light loss, and enables one change the pattern at a reasonably high frame rate. We build a prototype camera and evaluate its features and drawbacks comprehensively by experiments. We also demonstrate two coded aperture applications in light field acquisition and defocus deblurring.