Abstract
Focusing of an area array camera is an important step in making a high precision imaging camera. Its testing method needs special study. In this paper, a method of camera focusing is introduced. The defocusing depth of camera is calculated by using the frequency spectrum of defocused image. This method is especially suitable for the focusing of the Planar Array Camera, and avoids the complicated work of adjusting the focus plane of the planar array camera in the focusing process.
Highlights
Two kinds of method named DFF [1] [2] [3] [4] [5] (Depth from Focus) and DFD (Depth from Defocus) are described for measuring the defocusing distance of the camera and rapid autofocusing of the camera system
This paper describes the DFD method to adjust the focal plane of the camera
A plane array camera as an example is used to illustrate the process of realizing the fixed-focus of the camera by DFD method
Summary
Two kinds of method named DFF [1] [2] [3] [4] [5] (Depth from Focus) and DFD (Depth from Defocus) are described for measuring the defocusing distance of the camera and rapid autofocusing of the camera system. Focusing of a Area Array Camera, Frequency of Images, Defocused Image Through analyzing the image quality of a series of images, we can get the clarity of the images in different focus positions, and calculate the optimal position of the optical focal plane of the camera by fitting the defocusing curve.
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