A light field distance estimation method and light field imaging system
A distance estimation and light field imaging technology, applied in radio wave measurement systems, instruments, measurement devices, etc., can solve problems such as consumption and large computing memory, and achieve the effects of low computational complexity, high distance estimation accuracy, and simple structure
Active Publication Date: 2019-09-10
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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However, the current method requires multiple refocusing when estimating the distance of all planes on the light field image, and when the focal plane is very close to the main lens, it needs to interpolate the light field image and consume a large amount of computing memory
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[0056] Embodiments of the present invention will be described in detail below. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.
[0057] refer to Figure 1 to Figure 4 , in one embodiment, a kind of light field distance estimation method, the light field imaging system that adopts comprises calibration object and camera, wherein camera comprises master lens, microlens array, imaging unit, the distance of microlens array and imaging unit is fixed , is the focal length of the microlens array. The main lens used can be a single convex lens whose aperture value matches that of the microlens array. The light field distance estimation method comprises the following steps:
[0058] S1: Calibrate the camera and obtain the optical parameters of the camera;
[0059] S2: Adjust the positions of the imaging unit and the microlens array in the horizontal direction at the same time, so that...
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Provided are a light-field distance estimation method and a light-field imaging system. The light-field imaging system includes a calibration object and a camera, wherein the camera includes a main lens, a micro-lens array and an imaging unit, and the distance between the micro-lens array and the imaging unit is fixed as the focal length of the micro-lens array; according to the method, the camera is adopted to conduct shooting to obtain a light-field image, the imaging diameter of an object in the light-field image is extracted, the imaging diameter is substituted into an established distance estimation model, and the distance between the main lens and a plane where the object is located is solved. According to the light-field distance estimation method and the light-field imaging system, when the camera focuses on the calibration object, only the micro-lens array and the imaging unit need to be moved to make the imaging diameter of a calibration point on the calibration object minimum, and a complex refocus process is not needed. The imaging system is simple in structure, the presented distance estimation model is low in calculation complexity, and the distance estimation accuracy is relatively high.
Description
technical field [0001] The invention relates to the fields of computer vision and digital image processing, in particular to a light field distance estimation method and a light field imaging system. Background technique [0002] Light field cameras are widely used in computer vision, robotics and other fields because of their ability to obtain multi-dimensional information of the scene. Among them, the use of light field for distance measurement has gradually become a topic of concern to researchers. Traditional ranging methods are mainly divided into two categories: active ranging and passive ranging. Active ranging includes laser ranging and radar ranging. This ranging method not only requires expensive equipment, but also has high requirements for the environment. Passive distance measurement includes binocular distance measurement and camera array distance measurement, etc. This method mainly uses the principle of stereo matching, but the process of camera calibration ...
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IPC IPC(8): G01S11/12
Inventor 金欣陈艳琴戴琼海
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV