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Light field imaging automatic refocusing method

A light field imaging and refocusing technology, applied in optics, image analysis, optical components, etc., can solve problems such as large computational redundancy, improve execution efficiency, fast and effective refocusing operations, and overcome large computational redundancy. Effect

Active Publication Date: 2014-10-01
INST OF AUTOMATION CHINESE ACAD OF SCI
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Problems solved by technology

[0006] The present invention aims to break through the limitation of large calculation redundancy in the refocusing process of the existing light field imaging region of interest, and proposes a new automatic refocusing method for light field imaging to improve the refocusing efficiency of the region of interest in light field imaging. efficiency

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Embodiment Construction

[0039] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0040] When the imaging system is imaging the scene with a certain focal length, the image of the object located on the focal plane is clear, and the image of the object deviating from the focal plane is blurred. The out-of-focus blur is caused by this deviation, which can be analyzed and expressed by the point spread function (PSF), Based on this, the present invention establishes a light field refocusing model as:

[0041] g [ x ] = ( h ( β ) ⊗ p ) [ x ] + N [ x ...

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Abstract

The invention discloses a light field imaging automatic refocusing method. According to the method, a point spread function model and an ambiguity evaluation model are established, based on the models, according to different focusing depths and a corresponding refocusing image, an ambiguity evaluation function of an area of interest is estimated, the focusing depth of the area of interest is obtained by obtaining an extreme point of the function, and finally a refocusing image corresponding to the depth is obtained. By directly estimating the focusing depth of the area of interest, refocusing of the area of interest is achieved, the shortcoming that computing redundancy is large in the existing method is overcome, a quick and effective automatic refocusing mechanism is provided for optical field imaging in imaging field depth expanding, the execution efficiency of refocusing operation of the optical field imaging area of interest is improved, and studying, application and development of optical field imaging can be well promoted.

Description

technical field [0001] The invention relates to an automatic refocusing method for a region of interest (ROI) in light field imaging, and belongs to the technical fields of computational imaging, image processing, computer vision and the like. Background technique [0002] The light field is the propagation of light radiation in all directions at various positions in space. In 1908, Lippmann first proposed a light field camera based on a lens array. Until 1992, Adelson proposed a full light field camera on this basis and proposed its application in image depth extraction. Light field imaging as a computational imaging way began to receive more and more attention. Light field imaging uses its special imaging structure to broaden the types of data captured by images, and has been applied in the fields of expanding imaging depth of field, depth estimation, super-resolution, object segmentation, and biometric recognition. [0003] Taking advantage of the advantages of light fi...

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Application Information

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IPC IPC(8): H04N5/232G06T7/00G02B7/36
Inventor 谭铁牛孙哲南侯广琦张驰秦娅楠
Owner INST OF AUTOMATION CHINESE ACAD OF SCI
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