Active confocal imaging for visual prostheses.

Active confocal imaging for visual prostheses.
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DOI:
10.1016/j.visres.2014.10.023
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发表时间:
2015-06
期刊:
影响因子:
1.8
通讯作者:
Peli, Eli
Peli, Eli
中科院分区:
心理学3区
文献类型:
--
作者:
Jung, Jae-Hyun;Aloni, Doron;Yitzhaky, Yitzhak;Peli, Eli

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在盲人假体视力方面取得了令人鼓舞的进展,包括视网膜和皮质植入物,以及其他使用触觉或电刺激的“感觉替代装置”。然而,它们分辨率低,视野有限,只能显示很少的灰度级(动态范围有限),严重限制了它们的应用。为了克服这些限制,图像处理或成像系统可以强调感兴趣的对象并抑制背景杂波。我们提出了一种基于光场技术的主动共聚焦成像系统,该系统将使任何视觉假体的盲人用户能够有效地扫描、聚焦并仅看到感兴趣的对象,同时抑制来自背景杂波的干扰。该系统使用光场传感器捕获三维场景信息,并仅显示包含对象的聚焦平面。在捕获共焦图像后,基于模糊差异的去杂波过程去除杂波。在初步实验中,我们验证了基于共焦的背景杂波去除对低分辨率和有限动态范围的模拟磷光图像中目标识别的积极影响。使用定制的多摄像机系统,我们证实了利用光场成像可以有效地实现共焦去杂波图像的概念。
There are encouraging advances in prosthetic vision for the blind, including retinal and cortical implants, and other “sensory substitution devices” that use tactile or electrical stimulation. However, they all have low resolution, limited visual field, and can display only few gray levels (limited dynamic range), severely restricting their utility. To overcome these limitations, image processing or the imaging system could emphasize objects of interest and suppress the background clutter. We propose an active confocal imaging system based on light-field technology that will enable a blind user of any visual prosthesis to efficiently scan, focus on, and “see” only an object of interest while suppressing interference from background clutter. The system captures three-dimensional scene information using a light-field sensor and displays only an in-focused plane with objects in it. After capturing a confocal image, a de-cluttering process removes the clutter based on blur difference. In preliminary experiments we verified the positive impact of confocal-based background clutter removal on recognition of objects in low resolution and limited dynamic range simulated phosphene images. Using a custom-made multiple-camera system, we confirmed that the concept of a confocal de-cluttered image can be realized effectively using light field imaging.
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