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An effective rectification method for Lenselet-Based Plenoptic Cameras

机译：基于Lenselet的全光相机的有效矫正方法

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摘要

The Lenselet-Based Plenoptic has recently drawn a lot of attention in the field of computational photography. The additional information inherent in light field allows a wide range of applications, but some preliminary processing of the raw image is necessary before further operations. In this paper, an effective method is presented for the rotation rectification of the raw image. The rotation is caused by imperfectly position of micro-lens array relative to the sensor plane in commercially available Lytro plenoptic cameras. The key to our method is locating the center of each micro-lens image, which is projected by a micro-lens. Because of vignetting, the pixel values at centers of the micro-lens image are higher than those at the peripheries. A mask is applied to probe the micro-lens image to locate the center area by finding the local maximum response. The error of the center coordinate estimate is corrected and the angle of rotation is computed via a subsequent line fitting. The algorithm is performed on two images captured by different Lytro cameras. The angles of rotation are -0.3600° and -0.0621° respectively and the rectified raw image is useful and reliable for further operations, such as extraction of the sub-aperture images. The experimental results demonstrate that our method is efficient and accurate.
机译：基于Lenselet的全光望远镜最近在计算摄影领域引起了很多关注。光场中固有的附加信息允许广泛的应用，但是在进一步操作之前，必须对原始图像进行一些初步处理。本文提出了一种有效的原始图像旋转校正方法。旋转是由市售Lytro全光相机中微透镜阵列相对于传感器平面的位置不正确引起的。我们方法的关键是找到每个由微透镜投影的微透镜图像的中心。由于渐晕，微透镜图像的中心处的像素值高于周围的像素值。通过找到局部最大响应，使用遮罩探测微透镜图像以定位中心区域。校正中心坐标估计的误差，并通过随后的直线拟合计算旋转角度。该算法在不同的Lytro相机捕获的两个图像上执行。旋转角度分别为-0.3600°和-0.0621°，并且经过校正的原始图像对于进一步的操作（例如子孔径图像的提取）有用且可靠。实验结果表明我们的方法是有效和准确的。

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  • 来源
    《Optoelectronic imaging and multimedia technology IV》|2016年|100200f.1-100200f.6|共6页
  • 会议地点 Beijing(CN)
  • 作者

    Jing Jin; Yiwei Cao; Weijia Cai; Wanlu Zheng; Ping Zhou;

  • 作者单位

    School of Biological Science Medical Engineering, Southeast University, Nanjing, China 210096;

    School of Biological Science Medical Engineering, Southeast University, Nanjing, China 210096;

    School of Biological Science Medical Engineering, Southeast University, Nanjing, China 210096;

    School of Biological Science Medical Engineering, Southeast University, Nanjing, China 210096;

    School of Biological Science Medical Engineering, Southeast University, Nanjing, China 210096;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    rectification; light field; plenoptic cameras; Lytro; sub-aperture images;

    机译：整改光场全光摄像机Lytro;子孔径图像;

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