Lensless light-field imaging with Fresnel zone aperture: quasi-coherent coding

Shimano Takeshi; Nakamura Yusuke; Tajima Kazuyuki; Sao Mayu; Hoshizawa Taku

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Lensless light-field imaging with Fresnel zone aperture: quasi-coherent coding

机译：玻璃灯场成像与菲涅耳区光圈：准相干编码

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We propose a new type of lensless camera enabling light-field imaging for focusing after image capture and show its feasibilities with some prototyping. The camera basically consists only of an image sensor and Fresnel zone aperture (FZA). Point sources making up the subjects to be captured cast overlapping shadows of the FZA on the sensor, which result in overlapping straight moire fringes due to multiplication of another virtual FZA in the computer. The fringes generate a captured image by two-dimensional fast Fourier transform. Refocusing is possible by adjusting the size of the virtual FZA. We found this imaging principle is quite analogous to a coherent hologram. Not only the functions of still cameras but also of video cameras are confirmed experimentally by using the prototyped cameras. (C) 2018 Optical Society of America

机译：我们提出了一种新型无透镜摄像头，使图像捕获后的轻场成像可以聚焦，并以一些原型设计显示其可行性。相机基本上仅包括图像传感器和菲涅耳区孔径（FZA）。编码源构成要在传感器上捕获的受试者捕获FZA的重叠的阴影，这导致直线莫尔条纹由于计算机中另一个虚拟FZA的乘法而重叠。通过二维快速傅里叶变换，条纹生成捕获的图像。通过调整虚拟FZA的大小，可以进行重焦。我们发现这种成像原理与相干全息图相似。不仅通过使用原型摄像机通过实验确认了仍然相机的功能还是摄像机的功能。（c）2018年光学学会

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来源
《Applied optics》 |2018年第11期|共10页
作者
Shimano Takeshi; Nakamura Yusuke; Tajima Kazuyuki; Sao Mayu; Hoshizawa Taku;
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Hitachi Ltd Ctr Technol Innovat Elect Totsuka Ku 292 Yoshida Cho Yokohama Kanagawa 2440817 Japan;

Hitachi Ltd Ctr Technol Innovat Elect Totsuka Ku 292 Yoshida Cho Yokohama Kanagawa 2440817 Japan;

Hitachi Ltd Ctr Technol Innovat Elect Totsuka Ku 292 Yoshida Cho Yokohama Kanagawa 2440817 Japan;

Hitachi Ltd Ctr Technol Innovat Elect Totsuka Ku 292 Yoshida Cho Yokohama Kanagawa 2440817 Japan;

Hitachi Ltd Ctr Technol Innovat Elect Totsuka Ku 292 Yoshida Cho Yokohama Kanagawa 2440817 Japan;

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Lensless light-field imaging with Fresnel zone aperture: quasi-coherent coding

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