A Light Field Acquisition Device with Variable Spatial Resolution

Abstract

The present invention provides a light field acquisition device with variable spatial resolution. On the basis of the external design of the lens array, according to the task requirements of different imaging applications, the optical parameters of the optical accessories are determined by a task-driven parameter design method. And assembly parameters, and relying on the retractable connection structure, the spatial resolution of the imaging system is continuously variable, so that while maintaining the portability of the assembly of the external lens array light field acquisition device, it further meets the requirements of different applications for the spatial resolution of the imaging system The actual needs of flexible adjustment. The present invention aims at the feature that the spatial resolution of the imaging system of the external lens array light field camera is related to the installation parameters. By adopting a retractable mechanical connection structure, the spatial resolution of the imaging system is continuously adjustable, thereby realizing a set of variable space resolution light field acquisition device.

Description

technical field [0001] The invention relates to the fields of computer vision and optical engineering, in particular to a light field collection device. Background technique [0002] Compared with traditional optical imaging, which only records the light intensity distribution of the two-dimensional imaging plane, light field imaging can simultaneously capture the angle information including the scene occlusion relationship, thus introducing digital computing into the imaging process, providing high-quality visual The acquisition of information provides new ideas. [0003] At this stage, light field cameras based on lens arrays have gradually become the mainstream of light field acquisition devices. In 2005, Ren Ng designed the first hand-held microlens array built-in light field camera, but this device has the problem of low spatial resolution of light field sampling; in order to improve the spatial resolution of light field sampling, T.Geogiev et al. At the cost of sacri...

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Problems solved by technology

In 2005, Ren Ng designed the first hand-held microlens array built-in light field camera, but this device has the problem of low spatial resolution of light field sampling; in order to improve the spatial resolution of light field sampling, T.Geogiev et al. At the cost of sacrificing the angular resolution of the light field, a light field camera with a built-in focusing microlens array is designed. It can be seen that the focusing light field camera has a trade-off between the spatial resolution and the number of angular samples.

However, the design of a light field camera based on a built-in microlens array requires dismantling the traditional camera to insert the microlens array between its main lens and the sensor, and the operation of disassembling the internal structure of the traditional camera is relatively difficult in practice

In 2007, T.Geogiev et al. proposed a light field acquisition device with an external lens array, which mainly includes an optical element with a positive focal length and a lens array with a negative focal length, although the optical accessory can be portablely installed outside the main lens of a traditional camera , but its corresponding optimal installation distance is difficult to determine. At the same time, when the optical parameters of the imaging system are determined, its spatial resolution and angular sampling number are also fixed.

However, in practice, different imaging applications have significantly different requirements for the spatial resolution of the light field imaging system, so it is difficult for existing light field cameras to meet the shooting requirements of flexible adjustment of the spatial resolution of the imaging system

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