基于Lytro光场相机的数字重聚焦研究

Digital Refocusing Based on Lytro Light Field Camera

传统相机只能聚焦拍摄一定距离范围的清晰图像,而光场相机可以实现先拍照后聚焦,该相机无需在拍摄时对焦,通过对光场图像的后期处理实现任意距离处的数字重聚焦。对Lytro光场相机的数字重聚焦技术进行了研究,首先采用高曝光图像峰值检测法对微透镜阵列中心进行标定,再利用标定得到的中心坐标数据对原始光场数据进行重映射得到4D光场;最后对4D光场进行基变换和重积分得到任意距离处的重聚焦图像。实验结果验证了本文所提方法可实现光场图像任意焦面处的重聚焦。

While traditional cameras can only capture clear images within a certain distance,the light field camera does not need to focus when capturing the images,and digital refocusing at any distance can be achieved through post-processing of the captured light field image. In this paper, digital Lytro light field camera refocusing techniques are studied. Firstly,peak detection method is implemented to high-exposure image to calibrate the center of micro lens array; then the original light field image is remapped to get 4D light field data with the center coordinates data obtained in calibration; Finally,4D light field-based transformation and re-integration are conducted to get the refocused image at any distance. The experimental results show that the proposed method can achieve refocused light field images at any focal plane.