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

Researchers find an improved method of imaging objects through the fog

Posted by
Subscribe for News Feed
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.


  • 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.


  • 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.

Subscribe for News Feed