Researchers find an improved method of imaging objects through the fog | Daily Current Affairs 2021
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Researchers find an improved method of imaging objects through the fog

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Imaging objects through fog

Researchers have recently found a method that can improve the images captured on such days. The imaging of objects in foggy weather conditions may now be clearer.

Highlights:

  • The team from the Raman Research Institute (RRI), Bengaluru, an autonomous institute of the Department of Science and Technology; Space Applications Centre, Indian Space Research Organisation, Ahmedabad; Shiv Nadar University, Gautam Buddha Nagar; and Université Rennes and Université Paris-Saclay, CNRS, France, modulated the light source and demodulated them at the observer’s end to achieve sharper images.
  • The research was published in the journal ‘OSA Continuum’.
  • Research by a team has offered a solution for improving the image quality without heavy computations.
  • The study was partially funded by the Department of Science and Technology, Ministry of Science and Technology, Government of India.

Key Points:

  • The researchers demonstrated the technique by conducting extensive experiments on foggy winter mornings at Shiv Nadar University, Gautam Buddha Nagar, Uttar Pradesh.
  • With this technique, imaging of objects during foggy weather may now be clearer, as this method can improve images captured on foggy days.
  • This technique involves modulation of light source and demodulation at observer’s end.

About the Technique:

  • Researchers selected ten red LED lights as source of light.
  • They modulated this source of light by varying current flowing through LEDs at a rate of about 15 cycles per second.
  • A camera was installed at a distance of 150 metres from the LEDs, which captured image and transmitted it to desktop computer.
  • Then, computer algorithms used knowledge of modulation frequency to extract characteristics of the source.
  • This process is dubbed as ‘demodulation’.

Significance of technique:

  • This technique is cost-effective as it requires only a few LEDs and an ordinary desktop computer.
  • It can improve the landing techniques of aeroplanes by providing pilots with a good view of beacons across the runway.
  • It is better than relying only on reflected radio waves.
  • This method can also reveal obstacles in the path which are otherwise hidden by fog in rail, sea, and road transportation.
  • It can help in identifying lighthouse beacons.
  • This breakthrough could be of immense importance to the defence, maritime and aviation sectors.

Background:

  • Researchers have long attempted to use the physics of scattering and computer algorithms to process resulting data and improve the quality of images.
  • But computer algorithms require the processing of large volumes of data increasing storage and processing time.

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