Light field camera refocusing method

Abstract

The invention discloses a light field camera refocusing method based on orthogonal lattice point conversion. Firstly, a light field camera is used for shooting a uniform white wall or a uniform whitelight plate to obtain a white image, an inter-class variance method is used for solving an optimal threshold value of the white image and carrying out binaryzation, and a hexagonal-orthogonal latticepoint conversion method is used for correcting a white image contour area; on the basis, two-dimensional coordinates of a central point of a white image contour are calculated by using image invariantmoment, four-dimensional information of a light field is represented by using a biplanar parametric representation method, and finally, refocusing of the light field image is realized by using a light field imaging principle and an energy function of light. The refocused image is rich in details and high in calculation efficiency, can be used as an image post-processing algorithm to stably operate in the current infrared monitoring equipment, and improves the scene depth information collected by the current equipment.

Description

technical field [0001] The invention belongs to the field of light field image processing, and in particular relates to a light field camera refocusing method for scene depth information. Background technique [0002] Under the traditional two-dimensional imaging framework, there are limitations in solving many problems such as calculating the depth of the scene and obtaining the geometric shape of the target. The root cause of these limitations is that the traditional imaging method can only record the position information of the light passing through, but loses the light angle information that is highly coupled with the scene depth, target geometry, scene occlusion relationship, that is, three-dimensional (3D) information. The light field imaging theory can fundamentally solve the problem of light angle information collection. Therefore, it is of great practical significance to study computational photography based on light field imaging theory. [0003] Utilizing the li...

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to solve the problem that the existing imaging method can only record the position information of the light passing through, but loses the light angle information highly coupled with the scene depth, target geometry, scene occlusion relationship, etc. On the basis of equipment, through software algorithm, it provides a light field camera refocusing method based on orthogonal grid point conversion, which refocuses the collected light field image at 0.2 to 2 times the distance from the main lens to the focal plane between

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