Signal Processing: Image Communication ( IF 3.5 ) Pub Date : 2022-09-13 , DOI: 10.1016/j.image.2022.116869 Thomas Coppin , Douglas W. Palmer , Krishan Rana , Donald G. Dansereau , Michael J. Collins , David A. Atchison , Jonathan Roberts , Ross Crawford , Anjali Jaiprakash
Light field cameras show great potential for use in retinal imaging. The ability to refocus images and remove glare post-acquisition provides great benefits over current fundus cameras. Previous light field fundus cameras did not have the spatial resolution required for retinal screening. In this work, we design a light field fundus camera based on the specifications prescribed by the ISO standard for fundus cameras. We build a camera according to the developed specifications and test it using the method prescribed by the standard. We validate the design procedure by showing that the resolutions achieved by the constructed camera were similar to those achieved by the theoretical design. We additionally show that we can achieve a spatial resolution of 33.3 lp/mm which is a significant improvement over 17.96 lp/mm obtained in previous work. Given a larger sensor and custom microlens array, the proposed design procedure could feasibly provide the spatial resolution required for diagnostic retinal imaging while keeping the preferable qualities of a light field camera.
中文翻译:
用于视网膜成像的聚焦光场眼底相机设计
光场相机在视网膜成像中显示出巨大的潜力。在采集后重新聚焦图像和消除眩光的能力与当前的眼底相机相比具有很大的优势。以前的光场眼底相机没有视网膜筛查所需的空间分辨率。在这项工作中,我们根据 ISO 眼底相机标准规定的规格设计了一种光场眼底相机。我们根据开发的规格制造相机,并使用标准规定的方法对其进行测试。我们通过展示构建的相机实现的分辨率与理论设计实现的相似来验证设计程序。我们还表明,我们可以实现 33.3 lp/mm 的空间分辨率,这比之前工作中获得的 17.96 lp/mm 有了显着改进。