Filtered back-projection method and apparatus for reconstructing light field by focus stack

Abstract

The invention discloses a filtered back-projection method and apparatus for reconstructing a light field by a focus stack. The method mainly comprises the steps of giving out a geometric relationship of the four-dimensional light field and the focus stack, building a projection model for forming the focus stack by the light field, and forming a projection operator; based on the projection model, establishing a frequency domain relationship of the four-dimensional light field and the focus stack, and forming a Fourier slice relationship; based on the Fourier slice relationship, establishing filtered back-projection and convolution back-projection methods for reconstructing the light field by the focus stack; and selecting optimized filtering function and convolution function to reconstruct the light field. The focus stack is an image sequence collected by a relative motion of a detector and a lens, and by selecting the optimized filtering function and convolution function, the high-precision four-dimensional light field can be reconstructed. The four-dimensional light field can realize three-dimensional reconstruction under a shooting view angle of a camera, and can provide accurate three-dimensional structure information for virtual reality and geometric measurement.

Description

technical field

[0001] The invention relates to the fields of computer vision and digital image processing, and in particular to a filtered back projection method and device for reconstructing a light field from a focusing stack. Background technique

[0002] Light field imaging has become an important means of computational imaging and computer vision. Light field acquisition and acquisition has become an important research field. In recent years, light field data acquisition methods have emerged: one is direct acquisition means, that is, the light field is directly acquired by designing optical devices, such as light field cameras based on microlens arrays, camera arrays and lens arrays, etc.; the other is direct acquisition methods. It is an indirect acquisition method, that is, an ordinary camera is used to collect image data, and then the image data is post-processed to reconstruct the light field. However, for the existing direct acquisition methods, the acquisition ...

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