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借贷宝:停止催收百名裸条女大学生 未满23岁将不得借贷
京东白条多地频现盗刷 消费者遭催收公司“逼债”
借款野蛮催收行为将被规范 真是几家欢喜几家愁
为规范网贷催收 上海互金协会发行业倡议书
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EPFL开发全新成像技术 让普通摄像头捕获超高速视频

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编辑: 1   作者: cnbeta   时间: 2019/03/14 14:17/00  

慢速摄影(Slo-mo)不仅是智能机上的一项趣味功能,因为科学家们也在借助这项技术,去捕捉令人难以置信的实验细节,比如更好地理解火箭发射、闪电模式、以及毒蛇攻击等。近日,来自瑞士洛桑联邦理工学院(EPFL)的一支研究团队,展示了他们最新开发的成像技术。其特点是能够借助普通的摄像头,捕获令人难以置信的超高速影像。

虚拟帧技术可让普通摄像头捕获令人难以置信的高速视频(图自:2019 Jamani Caillet)

据悉,这项被称作“虚拟帧”的技术,由 EPFL 软界面工程力学实验室和哈佛大学的研究人员们共同打造。其开发出了一种全新的成像方法,可捕捉令人难以置信的一闪而过的细节。

在深入“虚拟帧”之前,我们先来描述下这样一个场景。当一滴水撞击水面、织物被撕碎、或是气球被弹出的时候,普通相机难免会拍下模糊的画面。

但若能够在拍摄时,以恰当的方式去照亮主体,科学家们就可以采用全新的方法,去描述这些高速发生的事件。EPFL 工程学院教授 John Kolinski 解释称:

初始照明必须恰当地完成,以便图片模糊部分包含的正确信息可被使用。基于此,物体必须具有可量化的瞬时状态 —— 要么完全遮挡住光线,要么完全让它通过。

研究配图 - 5:像素分辨率与帧速率之间的权衡(via:Optics Express)

后续照片会被处理成二进制图像,其中的物体被以黑色或白色像素点表示,而没有任何中间态。换言之,一块织物要么已被撕裂,要么就是完整的;物体的表面要么是干的,要么就是湿的。

研究人员可以放弃分配给普通图像的每千个像素的数千组灰度值,并借助传感器的功能,轻松将之涂成黑白或相反色。

这样一来,该方法能够在保持全空间分辨率(或图像像素数)的同时,实现更高的帧速率。据悉,在 400 万像素的情况下,他们已经实现了高达 65MHz 的帧速率(相当于 6500 万 fps)。

Kolinksi 表示,这就像是拍摄几乎瞬间消失的现象的延时照片。原则上,现代智能手机可借此实现超过 100 万 fps 的帧速率。

Drop of water impacting a drop of water - Jamani Caillet(via)

目前,研究人员正在各种领域测试这种新颖的成像技术。从常规的智能手机,到专业级的射击分析。当物体得到正确的照明时,它会始终如一地返回所需的结果。

有关这项研究的详情,已经发表在近日出版的《光学快讯》(Optics Express)期刊上。原标题为:《The virtual frame technique: ultrafast imaging with any camera》。

[来源:EPFL]