A Robust Light Field Camera Calibration Method
A technology of light field camera and calibration method, applied in image analysis, instrument, calculation and other directions, can solve the problems of microlens array processing error, difficult to achieve stable and accurate calibration, calibration result error, etc., achieve high-precision center point positioning, reliable The effect of high sex and high positioning
Active Publication Date: 2022-04-19
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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Problems solved by technology
Due to the processing error of the microlens array and the inevitable deviation in the installation process, the calibration method based on the local maximum value is difficult to achieve stable and accurate calibration in practical applications, especially when there are defects in the microlens, the calibration results often have Obvious error
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[0038] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0039] The present invention provides a robust light field camera calibration method, which basically includes the following steps:
[0040] Step 1. Set up a white scene, shoot it with a light field camera, and obtain the pictures required for calibration (such as figure 2 ).
[0041] Step 2: Filter the original image to reduce the influence of noise.
[0042] Step 3, center microlens calibration, including the following steps:
[0043] (3.1) Calculate the initial position of the central microlens:
[0044] (3.1.1)
[0045] Among them, width and height refer to the width and height of the filtered image respectively, and (x, y) is the initial position.
[0046] (3.2) Set the initial position as the center of the circle, set a search area of the same size as the microlens size, and search for a local maximum in this area.
[0047] (3....
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The invention discloses a robust light field camera calibration method. The method includes: first, using a light field camera to image a diffuse reflection whiteboard or an arbitrary white scene, and calibrate the microlens closest to the center of the image; then calibrate the remaining microlenses in the row where the microlens is located; secondly, Or calibrate the remaining microlenses row by row; finally, by constructing a Delaunay triangular grid, remove the bad pixels that do not meet the requirements, and correct the projection center position of the microlenses at the bad points. Compared with the traditional method of locating the center of the microlens through the local maximum value, the present invention is based on the inherent characteristics of the microlens array structure and the sub-aperture image, and effectively solves the deviation of the microlens at the edge of the image caused by the processing and installation errors of the microlens array. If the shift is large, the microlens calibration at the edge position is not robust, and the microlens with defects is calibrated incorrectly, which greatly improves the robustness and versatility of the algorithm.
Description
technical field [0001] The invention relates to a calibration method for a light field camera, which is characterized by robustness, stability and high precision. The invention belongs to the technical field of computer vision light field imaging. Background technique [0002] As a new type of imaging device, the light field camera simultaneously records the light intensity information and angle information of the scene, so that it has many features that traditional cameras do not have, such as refocusing, depth extraction, and extended depth of field. [0003] The light field camera based on the microlens array uses the microlens array to defocus or re-imaging the image of the main lens to realize the encoding of light angle information. How to accurately calibrate the light field camera to realize the decoding of the light field camera is the basis of many applications of the light field camera. Calibration accuracy and stability directly affect subsequent applications. ...
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IPC IPC(8): G06T7/80
CPCG06T7/80
Inventor 伍俊龙郭正华陈先锋马帅杨平许冰
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI