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High-Accuracy Correction of a Microlens Array for Plenoptic Imaging Sensors

Key Laboratory of Aerospace Thermophysics, Ministry of Industry and Information Technology, School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
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Sensors 2019, 19(18), 3922; https://doi.org/10.3390/s19183922
Received: 30 August 2019 / Revised: 10 September 2019 / Accepted: 10 September 2019 / Published: 11 September 2019
(This article belongs to the Section Optical Sensors)
Microlens array (MLA) errors in plenoptic cameras can cause the confusion or mismatching of 4D spatio-angular information in the image space, significantly affecting the accuracy and efficiency of target reconstruction. In this paper, we present a high-accuracy correction method for light fields distorted by MLA errors. Subpixel feature points are extracted from the microlens subimages of a raw image to obtain correction matrices and perform registration of the corresponding subimages at a subpixel level. The proposed method is applied for correcting MLA errors of two different categories in light-field images, namely form errors and orientation errors. Experimental results show that the proposed method can rectify the geometric and intensity distortions of raw images accurately and improve the quality of light-field refocusing. Qualitative and quantitative comparisons between images before and after correction verify the performance of our method in terms of accuracy, stability, and adaptability. View Full-Text
Keywords: plenoptic camera; microlens array; error correction; light-field image processing plenoptic camera; microlens array; error correction; light-field image processing
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Li, S.; Yuan, Y.; Gao, Z.; Tan, H. High-Accuracy Correction of a Microlens Array for Plenoptic Imaging Sensors. Sensors 2019, 19, 3922.

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