Digital focusing method and digital focusing device used for optical field imaging

A technology of light field imaging and focusing method, which is applied in the direction of image communication, color TV parts, TV system parts, etc. It can solve the problems of large amount of calculation, long calculation time, and complex calculation, and reduce the amount of data , time-saving effect

Inactive Publication Date: 2009-10-21
BEIHANG UNIV
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Problems solved by technology

[0013] In the reconstructed image sequence obtained by the existing method, each image data is obtained from the four-dimensional light field data of the entire image and transforme...

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  • Digital focusing method and digital focusing device used for optical field imaging
  • Digital focusing method and digital focusing device used for optical field imaging
  • Digital focusing method and digital focusing device used for optical field imaging

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Embodiment Construction

[0036] The digital focusing method for light field imaging of the present invention first obtains a two-dimensional light field image, and converts it into four-dimensional light field data; determines the window range of the target to be digitally focused in the existing image, so that the target occupies Most of the area of ​​the window; obtaining the two-dimensional light field data of the window from the two-dimensional light field image data, and converting it into four-dimensional light field data; according to the obtained four-dimensional light field data of the window, according to different The focus parameters of the window image are reconstructed to obtain the image sequence; the image clarity evaluation is performed on the image sequence respectively, and the focus parameter value when the image clarity evaluation value is the highest is obtained, and the four-dimensional light of the existing image is converted according to this focus parameter value. The field da...

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Abstract

The invention relates to a digital focusing method and a digital focusing device used for optical field imaging. The method comprises the following steps: selecting a window range of a target from a two-dimensional optical field image, and extracting optical field data in the window range; according to different focusing parameters, performing target image reconstruction to obtain an image sequence; and performing image definition evaluation on the image sequence, and finding an optimal focusing parameter value so as to obtain a refocusing image with optimal target definition. The method and the device reduce quantity of data participating in the image reconstruction, thereby saving time for digital focusing.

Description

technical field [0001] The present invention relates to an imaging method and device, in particular to a digital focusing method and device for light field imaging. Background technique [0002] The concept of light field imaging was proposed and developed by Marc Levoy and Ren Ng et al. It mainly refers to obtaining the spatial distribution of the target light radiation and the direction information of radiation transmission by using aperture segmentation or adding a modulation mask in the traditional optical imaging system, that is, the four-dimensional light field in the camera. By calculating and processing the light field data, a composite image refocused on a specified depth target is obtained, and digital focusing is realized. [0003] The light field distribution in the camera can be expressed by the optical flow between two planes, such as figure 1 As shown, the plane (u, v) is the pupil plane of the imaging system, the plane (x, y) is the detector plane, and the ...

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Application Information

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IPC IPC(8): H04N5/232
Inventor 袁艳周宇胡煌华周志良张修宝
Owner BEIHANG UNIV
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