Dr. Mohanamuralidhar Rao Kunda Profile

Dr. Mohanamuralidhar Rao Kunda

at National Remote Sensing Agency

SPIE Involvement:

Author

Proceedings Article | 22 December 2006 Paper

Onboard multispectral data compression using JPEG-like algorithm: a case study

A. Senthil Kumar, T. Radhika, P. V. Narashima Rao, A. Manjunath, K. M. M. Rao

Proceedings Volume 6405, 640527 (2006) https://doi.org/10.1117/12.697564

KEYWORDS: Data compression, Image compression, Image quality, Multispectral imaging, Image analysis, Image resolution, Chromium, Reconstruction algorithms, Data transmission, Image classification

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Proceedings Article | 22 December 2006 Paper

Fast searching of spectral library database using variable interval spectral average method

A. Senthil Kumar, S. Jayabharathi, A. Manjunath, K. M. M. Rao

Proceedings Volume 6405, 64051K (2006) https://doi.org/10.1117/12.697554

KEYWORDS: Minerals, Databases, Hyperspectral imaging, Absorption, Calcite, Remote sensing, Reflectivity, Principal component analysis, Wavelets, Signal detection

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Proceedings Article | 22 December 2006 Paper

On-orbit spatial resolution estimation of IRS—CARTOSAT-1 cameras with images of artificial and man-made targets: preliminary results

A. Senthil Kumar, A. Manjunath, K. Rao, A. S. Kiran Kumar, R. Navalgund, K. Radhakrishnan

Proceedings Volume 6405, 64050W (2006) https://doi.org/10.1117/12.697001

KEYWORDS: Modulation transfer functions, Cameras, Satellites, Point spread functions, Spatial resolution, Satellite imaging, Infrared cameras, Signal to noise ratio, Sensors, Infrared imaging

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Proceedings Article | 30 November 2006 Paper

Design of system calibration for effective imaging

G. Varaprasad Babu, K. Rao

Proceedings Volume 6407, 64070H (2006) https://doi.org/10.1117/12.697275

KEYWORDS: Calibration, Imaging systems, Charge-coupled devices, Light, Lamps, Light sources, Sensors, Amplifiers, Image processing, Data corrections

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A CCD based characterization setup comprising of a light source, CCD linear array, Electronics for signal conditioning/ amplification, PC interface has been developed to generate images at varying densities and at multiple view angles. This arrangement is used to simulate and evaluate images by Super Resolution technique with multiple overlaps and yaw rotated images at different view angles. This setup also generates images at different densities to analyze the response of the detector port wise separately. The light intensity produced by the source needs to be calibrated for proper imaging by the high sensitive CCD detector over the FOV. One approach is to design a complex integrating sphere arrangement which costs higher for such applications. Another approach is to provide a suitable intensity feed back correction wherein the current through the lamp is controlled in a closed loop arrangement. This method is generally used in the applications where the light source is a point source. The third method is to control the time of exposure inversely to the lamp variations where lamp intensity is not possible to control. In this method, light intensity during the start of each line is sampled and the correction factor is applied for the full line. The fourth method is to provide correction through Look Up Table where the response of all the detectors are normalized through the digital transfer function. The fifth method is to have a light line arrangement where the light through multiple fiber optic cables are derived from a single source and arranged them in line. This is generally applicable and economical for low width cases. In our applications, a new method wherein an inverse multi density filter is designed which provides an effective calibration for the full swath even at low light intensities. The light intensity along the length is measured, an inverse density is computed, a correction filter is generated and implemented in the CCD based Characterization setup. This paper describes certain novel techniques of design and implementation of system calibration for effective Imaging to produce better quality data product especially while handling high resolution data.

Conference Committee Involvement (2)

GEOSS, CEOS, and the Future Global Remote Sensing Space System for Societal Benefits

18 November 2008 | Noumea, New Caledonia

GEOSS and Next-Generation Sensors and Missions

13 November 2006 | Goa, India

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