Effects of the atmosphere on image quality in the imaging lidar system

B. Presennakumar; Anoop Kumar S.; D. Ramakrishna Rao; S. Muraleedharen Nair; Mohankumar Santhibhavan Vasudevanpillai; S. Veerabuthiran; M. Satyanarayana

doi:10.1117/12.694584

12 December 2006 Effects of the atmosphere on image quality in the imaging lidar system

B. Presennakumar, Anoop Kumar S., D. Ramakrishna Rao, S. Muraleedharen Nair, Mohankumar Santhibhavan Vasudevanpillai, S. Veerabuthiran, M. Satyanarayana

Author Affiliations +

Proceedings Volume 6409, Lidar Remote Sensing for Environmental Monitoring VII; 64090X (2006) https://doi.org/10.1117/12.694584
Event: SPIE Asia-Pacific Remote Sensing, 2006, Goa, India

Abstract

Lidar techniques are based on the interaction of the laser beam with various constituents of the atmosphere like aerosols, gas molecules etc. Various atmospheric conditions like temperature turbulence, refractive index variation, fog, rain etc. really influence the transmission properties of the laser beam. An Imaging Lidar provides a 3-D Image of the targets like clouds when used vertically up in the atmosphere or any terrestrial object on the ground when used horizontally. Various image processing techniques are used to improve the image quality by using various mathematical models related to atmospheric conditions. A portable IR Imaging lidar system has been designed and developed for imaging the terrestrial targets during nighttime in complete dark conditions. The system is also being used for study of the structure of clouds in the troposphere. The system mainly consists of a CW laser source operating in the IR region and a CCD array-imaging device with zooming capability to cover the long range. The CCIR standard video output available from the CCD camera is monitored by a high resolution monochrome monitor. The video output is digitized using a frame grabber board. The digitized image is subjected to online and offline processing methods. The image signal depends on the integral response of the laser source, reflection/scattering properties of the objects, atmospheric effects etc. Based on the image processing methods needed to improve the quality of image under different atmospheric conditions, known a priori, an empirical model is developed. This paper describes the imaging lidar system developed and the image processing.

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B. Presennakumar, Anoop Kumar S., D. Ramakrishna Rao, S. Muraleedharen Nair, Mohankumar Santhibhavan Vasudevanpillai, S. Veerabuthiran, and M. Satyanarayana "Effects of the atmosphere on image quality in the imaging lidar system", Proc. SPIE 6409, Lidar Remote Sensing for Environmental Monitoring VII, 64090X (12 December 2006); https://doi.org/10.1117/12.694584

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KEYWORDS

LIDAR

Image processing

Imaging systems

Image quality

Image filtering

Linear filtering

Signal to noise ratio

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