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A frequency domain optical field digital refocusing algorithm capable of suppressing resampling error

A digital refocusing and resampling technology, applied in computing, image data processing, color TV components, etc., can solve problems such as artifacts and reconstruction errors

Active Publication Date: 2019-02-19
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

[0005] The present invention aims to provide a frequency-domain light-field digital refocusing technology that can suppress resampling errors, aiming at the problem that reconstruction errors will be caused during resampling of frequency-domain data and artifacts will be generated in reconstructed images in the existing frequency-domain digital refocusing technology. Focusing algorithm, this algorithm effectively avoids the error caused by the resampling of discrete data caused by frequency domain coordinate transformation by performing spatial coordinate transformation on the original 4D light field

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  • A frequency domain optical field digital refocusing algorithm capable of suppressing resampling error

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[0025] In order to make the objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0026] In order to better understand the derivation process of the algorithm of the present invention, the following briefly introduces the existing light field digital refocusing principle and the frequency domain slice-based light field digital refocusing algorithm proposed by Ng.

[0027] According to the light field 4D parameter model, the 4D light field recorded by the microlens light field camera can be expressed as According to the light radiation formula, the image intensity obtained by the camera image plane can be expressed as:

[0028]

[0029] Where F represents the distance between the main lens plane and the image plane, and φ represents the angle between the light (x, y, u, v) and the focal plane. definition Formula (1)...

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Abstract

The invention discloses a frequency domain optical field digital refocusing algorithm capable of suppressing resampling error, and belongs to the field of optical field image calculation, which solvesthe problem that the existing frequency domain digital refocusing technology causes resampling error in frequency domain data resampling and generates artifacts in the reconstructed image. The specific steps are as follows: At first, that 4D light field is transform into spatial coordinates according to the refocusing depth, Then the center slice in the horizontal direction is taken from the Fourier spectrum, and the refocusing image is obtained by 2D inverse Fourier transform of the central slice. The algorithm avoids the error of discrete data resampling caused by the frequency coordinate transform effectively through the spatial coordinate transformation of the original 4D light field. Compared with the traditional light field digital refocusing method based on the Fourier projection slice theorem, the algorithm of the invention requires fewer operation steps and has lower computational complexity. At the same time, it can achieve the same refocusing effect as the most robust spatial projection integral digital refocusing algorithm.

Description

technical field [0001] The invention belongs to the field of light field image calculation, in particular to a frequency domain light field digital refocusing algorithm capable of suppressing resampling errors. Background technique [0002] With the continuous development of light field rendering theory and plenoptic functions, light field imaging technology has become a hot topic in modern computational photography. With the remarkable advantages of taking pictures first and then focusing, light field cameras have led the digital industry in the past ten years. A revolution. According to the biplane parameterized model of the light field, Ng places a microlens array in front of the sensor of a conventional camera to obtain a 4D light field, and calls this light field camera model a plenoptic camera. The design of the microlens array plays the role of splitting the light inside the camera, so that the light field camera not only records the position information of the light...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/11G06T7/50G06T7/70H04N5/232
CPCG06T7/11G06T7/50G06T7/70H04N23/67H04N23/80
Inventor 武迎春张雄王玉杰倪进王安红
Owner TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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