光场相机重聚焦性能的研究

发布时间：2018-01-22 13:18

本文关键词： 光场 Lytro相机微透镜阵列重聚焦图像全聚焦　出处：《中北大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着光场成像技术的不断发展,光场相机不停地运用在各个领域,目前越来越多的技术都不断以三维图像的形式出现在我们的生活当中,因此我们可以更好地感受现实场景的多元化。而2012年Lytro相机的问世,更加方便了消费者的使用,为摄影爱好者解决了很多难题。本文对光场相机的重聚焦性能展开了深入的研究,主要内容包含对提取到的原始灰度图像进行编码、颜色校正及标定等处理,根据光场成像技术完成光场图像重聚焦,由图像序列融合得出图像全聚焦,用分割的立体匹配法分析图像的视差图,本文具体的流程如下:首先,将Lytro相机作为本文研究所需要的设备,考虑到Lytro相机作为一个封闭的黑盒子,本文从Lytro相机的工作原理、文件结构及算法分析了光场相机的性能,完成了对Lytro相机所采集到的原始图像的编码、标定、颜色校正及内容的数字转化。然后,着重研究光场相机的成像原理及光场的双平面参数化表示,在此基础上分析了光场能量函数,通过对该函数的研究得出光场在成像系统中所使用的表达式,分析了Lytro相机的重聚焦技术,采用空间域积分重聚焦技术得到不同焦点的光场图像,并且根据光场在机身内的传播路径,光路分布图以及透镜折射原理模拟出了光场成像系统,得到了光场模拟图象并完成了重聚焦。最后,在重聚焦的基础上对光场图像进一步研究,先构造子图像序列,对子图像进行数字重聚焦,采用适当的清晰度评价函数计算子图像的最高聚焦点,然后采用图像融合技术得到全聚焦的光场图像。本文对图像视差图进行了一定的研究,为后续的深度测量和三维重建奠定了基础。
[Abstract]:With the continuous development of optical field imaging technology, optical field cameras are constantly used in various fields. At present, more and more technologies appear in our lives in the form of three-dimensional images. So we can better feel the diversity of the real scene, and in 2012, the Lytro camera came out to make it more convenient for consumers to use. Many problems have been solved for photographers. In this paper, the refocusing performance of the field camera is studied in depth. The main contents include coding the original gray image, color correction and calibration. According to the light field imaging technology to complete the light field image refocusing, from the image sequence fusion to get the image full focus, using segmentation stereo matching method to analyze the parallax image. The specific flow of this paper is as follows: first. Taking the Lytro camera as the equipment needed for the research in this paper, considering the Lytro camera as a closed black box, this paper starts from the working principle of the Lytro camera. The file structure and algorithm analysis of the performance of the light field camera, the completion of the Lytro camera collected the original image coding, calibration, color correction and digital conversion of the content. The imaging principle of the light field camera and the biplane parameterized representation of the light field are studied emphatically. On this basis, the energy function of the light field is analyzed, and the expression of the light field used in the imaging system is obtained through the study of the function. The refocusing technology of Lytro camera is analyzed. The spatial domain integral refocusing technique is used to obtain the light field images with different focal points, and according to the propagation path of the light field in the fuselage. The light field imaging system is simulated by the optical path distribution and the lens refraction principle. The simulated image of the light field is obtained and the refocusing is completed. Finally, the light field image is further studied on the basis of the refocusing. First, the sub-image sequence is constructed, and the sub-image is digitally refocused, and the highest focus of the sub-image is calculated by the appropriate definition evaluation function. Then the fully focused light field image is obtained by image fusion technology. In this paper, the parallax image is studied, which lays a foundation for the subsequent depth measurement and 3D reconstruction.
【学位授予单位】：中北大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP391.41

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