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Journal of Imaging, Volume 5, Issue 4

2019 April - 8 articles

Cover Story: A new method to measure ecological light pollution, a novel anthropogenic stressor that affects flora and fauna on many scales is presented. We used a commercial digital camera with a fisheye lens to acquire at least two vertical-plane multispectral (RGB) images to cover the full solid angle, not only the all-sky view. This simple procedure provides a comprehensive way to characterize nocturnal light and light pollution. To make the method accessible to a broad audience, we give a step-by-step explanation of the technical and practical procedure and software to process luminance and correlated color temperature maps. The image shows data obtained in winter near the arctic circle in Finland. View this paper.
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Articles (8)

  • Article
  • Open Access
13 Citations
9,370 Views
12 Pages

Evaluating Human Photoreceptoral Inputs from Night-Time Lights Using RGB Imaging Photometry

  • Alejandro Sánchez de Miguel,
  • Salvador Bará,
  • Martin Aubé,
  • Nicolás Cardiel and ,
  • Carlos E. Tapia,
  • Jaime Zamorano and
  • Kevin J. Gaston
  • + 2 authors+ 0 author

Night-time lights interact with human physiology through different pathways starting at the retinal layers of the eye; from the signals provided by the rods; the S-, L- and M-cones; and the intrinsically photosensitive retinal ganglion cells (ipRGC)....

(This article belongs to the Special Issue Light Pollution Assessment with Imaging Devices)
  • Review
  • Open Access
103 Citations
15,328 Views
25 Pages

In this era of digitization, most hardcopy documents are being transformed into digital formats. In the process of transformation, large quantities of documents are stored and preserved through electronic scanning. These documents are available from...

  • Article
  • Open Access
17 Citations
5,874 Views
14 Pages

Qualitative methods are widely used for the solution of inverse obstacle problems. They allow one to retrieve the morphological properties of the unknown targets from the scattered field by avoiding dealing with the problem in its full non-linearity...

(This article belongs to the Special Issue Microwave Imaging and Electromagnetic Inverse Scattering Problems)
  • Article
  • Open Access
77 Citations
15,154 Views
17 Pages

Artificial light at night is a novel anthropogenic stressor. The resulting ecological light pollution affects a wide breadth of biological systems on many spatio-temporal scales, from individual organisms to communities and ecosystems. However, a wid...

(This article belongs to the Special Issue Light Pollution Assessment with Imaging Devices)
  • Article
  • Open Access
18 Citations
7,831 Views
26 Pages

Zig-Zag Based Single-Pass Connected Components Analysis

  • Donald G. Bailey and
  • Michael J. Klaiber

Single-pass connected components analysis (CCA) algorithms suffer from a time overhead to resolve labels at the end of each image row. This work demonstrates how this overhead can be eliminated by replacing the conventional raster scan by a zig-zag s...

(This article belongs to the Special Issue Image Processing Using FPGAs)
  • Article
  • Open Access
13 Citations
8,929 Views
15 Pages

Street Sign Recognition Using Histogram of Oriented Gradients and Artificial Neural Networks

  • Kh Tohidul Islam,
  • Sudanthi Wijewickrema,
  • Ram Gopal Raj and
  • Stephen O’Leary

Street sign identification is an important problem in applications such as autonomous vehicle navigation and aids for individuals with vision impairments. It can be especially useful in instances where navigation techniques such as global positioning...

  • Article
  • Open Access
18 Citations
10,201 Views
17 Pages

Ultrasound (US) could become a standard of care imaging modality for the quantitative assessment of femoral cartilage thickness for the early diagnosis of knee osteoarthritis. However, low contrast, high levels of speckle noise, and various imaging a...

  • Article
  • Open Access
14 Citations
10,169 Views
24 Pages

To systematically analyze biological changes with spatiotemporal dynamics, it is important to establish a system that is amenable for real-time in vivo imaging at various size levels. Herein, we focused on the developing pupal wing tissues in the pal...

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J. Imaging - ISSN 2313-433X