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Light field acquisition method

An acquisition method, a technology for encoding aperture, applied in the field of computational photography, which can solve problems such as not considering four-dimensional space

Active Publication Date: 2014-09-10
BEIJING UNIV OF TECH
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Problems solved by technology

However, the acquisition method of Babacan et al. only performs aliasing observations on the angular dimension (u, v), without considering the information correlation between the entire four-dimensional space (u, v, s, t)

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Embodiment Construction

[0015] This light field acquisition method includes the following steps:

[0016] (1) Scan the images collected by the light field camera K times by column to obtain a column vector;

[0017] (2) Use the observation matrix, prior constraints and the column vector of step (1) as the known quantities of the designed optimization model, and use the convex programming cvx toolkit to obtain the optimal solution;

[0018] (3) The optimal solution obtained in step (2) is used as the reconstructed light field, compared with the original light field, and the peak signal-to-noise ratio PSNR value is calculated as a measure of the reconstruction quality.

[0019] This method combines a random convolution CMOS optical sensor device with a coded aperture to achieve double observation of the angular dimension and spatial dimension of the light field. Compared with the previous single observation of the angular dimension, it improves the Image quality, or in other words, the compression rat...

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Abstract

The invention discloses a light field acquisition method, which can realize dual observation on the light field angle dimension and the spatial dimension and can improve the image quality on the premise of the same compression ratio. The method comprises steps: (1) images acquired by a light filed camera at K times are scanned in columns to obtain a column vector; (2) the measurement matrix, priori constraints and the column vector of the first step serve as known quantities of the designed optimization model, and the optimal solution is acquired by using a convex programming cvx toolkit; and (3) the optimal solution acquired by the second step serves as the reconstructed light field, the reconstructed light field is compared with an original light filed, and the value of the peak signal to noise ratio (PSNR) is calculated to serve as the measurement of the reconstructed quality.

Description

technical field [0001] The invention belongs to the technical field of computational photography, and in particular relates to a light field acquisition method. Background technique [0002] With the development of computational photography, more light information can be captured using optical devices and post-processing techniques. A commonly used way to express light information is light field. The so-called light field refers to a 4-dimensional function L(u, v, s, t), where (u, v) and (s, t) are light and double The two intersection coordinates of the plane, L describes the radiance of the light. Since the traditional camera can only capture the 2D projection of the 4D light field, many novel camera designs for collecting 4D information of the scene have appeared in recent years, which are generally called light field cameras. Currently, there are two types of light field cameras: single-camera multiplexing and multi-camera arrays. For the sake of this article, only th...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00G06T5/00G06T7/90
Inventor 尹宝才王玉萍王立春孔德慧
Owner BEIJING UNIV OF TECH