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相关概念视频

Computed Tomography01:10

Computed Tomography

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Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...
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Design Example: Traverse Angle Computations01:25

Design Example: Traverse Angle Computations

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Traverse angle computations are a critical component of surveying, used to compute the internal angles within a closed traverse. A traverse consists of a series of connected lines forming a closed loop, often used for land boundary delineation or mapping. Calculating the internal angles ensures accuracy in the traverse geometry and is essential for checking survey data integrity.The process begins with known azimuths and bearings of the traverse sides. Internal angles at each vertex are...
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Area Computation by the Alternative Coordinate Method01:24

Area Computation by the Alternative Coordinate Method

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The alternative coordinate method, also known as the Shoelace Formula, is a technique for determining the area of a traverse using Cartesian coordinates. This method relies on the sequential arrangement of x and y coordinates for each point of the shape, ensuring accuracy and ease of application.In this approach, each corner's x and y coordinates are listed as fractions, with the x-coordinate as the numerator and the y-coordinate as the denominator. These coordinates are arranged sequentially...
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Imaging Studies III: Computed Tomography01:27

Imaging Studies III: Computed Tomography

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DefinitionComputed Tomography (CT) of the genitourinary (GU) tract is a non-invasive imaging modality that utilizes X-rays and computer processing to generate detailed cross-sectional images of the urinary system, encompassing the kidneys, ureters, bladder, and adjacent structures such as the adrenal glands.PurposeCT scans of the GU tract serve several diagnostic and therapeutic purposes, including:Diagnosis of Urinary Tract Diseases: Detects kidney stones, tumors, cysts, and congenital...
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Social Foundations of Self IV: Self in Digital Communication01:30

Social Foundations of Self IV: Self in Digital Communication

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Since the early 2000s, computer-mediated communication (CMC) has grown rapidly, playing a crucial role in self-development. A key distinction between CMC and real-life interactions is the lack of a physically present partner. This absence makes non-verbal cues such as facial expressions, body language, and paralinguistic signals unavailable in CMC platforms like email, instant messaging, or social media. The lack of these cues can create ambiguity and complicate how feedback is interpreted.The...
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A postsynaptic neuron usually receives numerous impulses from several other presynaptic neurons. The axon hillock of the postsynaptic neuron integrates all these signals and determines the likelihood of firing an action potential.
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使用普通数码相机的计算潜望镜

Charles Saunders1, John Murray-Bruce1, Vivek K Goyal2

  • 1Department of Electrical and Computer Engineering, Boston University, Boston, MA, USA.

Nature
|January 25, 2019
PubMed
概括
此摘要是机器生成的。

这项研究提出了一种使用普通相机拍摄的单一照片的新计算潜望镜方法. 它可以在没有专用设备的情况下在障碍物周围进行非视线成像.

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科学领域:

  • 光学学
  • 计算机视觉
  • 计算机成像

背景情况:

  • 传统的非视线成像 (NLOS) 依赖于专门的,昂贵的超快光学系统.
  • 现有的方法往往依赖于光线的运行时间,

研究的目的:

  • 介绍一种新的二维计算潜望镜技术.
  • 使用单个标准数字照片实现非视线成像.

主要方法:

  • 使用普通数码相机拍摄的一张照片.
  • 使用射线光学模拟物体可见半影和隐藏场景之间的线性依赖.
  • 不需要控制或时间变化的照明.

主要成果:

  • 成功地恢复一个不透明的物体的位置和它背后的场景.
  • 在没有视线的障碍物周围实现非视线成像
  • 用常见的摄影设备展示计算潜望镜的可行性.

结论:

  • 这种技术为非视线成像提供了低成本,易于使用的解决方案.
  • 潜在的应用包括危险环境监测,导航和安全.
  • 通过简化NLOS场景的硬件要求,推进计算成像.