MATLAB PROJECT
Effects
of Aperture Diameter on Image Blur of CMOS Image Sensor With Pixel Apertures
Abstract:
This paper presents the effects of aperture diameter on image blur of
complementary metal-oxide-semiconductor (CMOS) image sensor with pixel
apertures for depth extraction. In a conventional camera system, the aperture
is located at the camera lens. However, in the proposed camera system, the
aperture is located on the photodiode. The patterns in the pixel array of the
fabricated CIS are composed of blue, red, and white pixels, as well as pixel
apertures. The pixel apertures are formed by a metal pattern in the white
pixels and designed using a metal layer in the CIS process. The focused and
defocused images are simultaneously obtained using white pixels with and
without the pixel apertures. The focused image can be used as a reference image
to extract depth information for 3-D imaging. The sensor was designed and
fabricated using the 0.11-μm CIS process. The image blur as a function of the
aperture diameter was measured using the fabricated sensor. In addition, the
effects of the F -number of the camera lens, which is defined as the ratio of
focal length to the diameter of the camera lens, and variation in the output of
the CIS with the angle of incidence were investigated.
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