摘要
利用计算成像的方法得到不同方向、位置、景深处的图像以满足不同需求,实现先拍照后对焦的功能,克服了传统相机机械式调焦带来的缺陷,但其子光圈图像空间分辨率受微透镜数目的限制,成像质量相比传统相机有所下降。为此提出了一种高分辨率数字对焦方法,即先提取子光圈图像,然后采用小波和插值相结合的算法把每个子光圈图像的分辨率提高一倍,组成高分辨率子光圈图像阵列,再对该子光圈图像阵列做傅里叶切片变换重聚焦处理。通过对比处理结果发现,图像清晰度和分辨率均得到了提高。
The pictures in different directions, locations and depths of focus are obtained using the method of computational imaging to satisfy the different requirements and to achieve the function of taking the picture before focusing the camera, and overcoming the drawbacks of mechanical focusing in traditional camera. However, its image quality is lower than the traditional camera because its resolution is restricted by the number of microlens. The high resolution digital autofocus method is proposed, that is extracting the sub aperture pictures firstly, and then doubling the resolution of every sub aperature pictures by the method of the combination of wavelet transformation and interpolation. So, the sub aperature picture array with high resolution can be formed. The refocus processing on this array by Fourier slice transformation is done, and the processed results show that the definition and resolution of the refocused images increase greatly.
出处
《激光与光电子学进展》
CSCD
北大核心
2016年第10期83-89,共7页
Laser & Optoelectronics Progress
基金
中国科学院上海技术物理研究所导向性基础研究项目(CX-52)
关键词
图像处理
高分辨率重聚焦图像
小波和插值相结合的算法
傅里叶切片变换
数字对焦
子光圈图像
image processing
high resolution refocused image
combination algorithm of wavelet transformation and interpolation
Fourier slice transformation
digital focus
sub aperature picture
