Significance of pre-processing and its impact on lossless hyperspectral image compression

ABSTRACT

The primitive aspect of hyperspectral imagery is its inherent spatial and spectral correlation. This correlation is exploited by subjecting the imaging cube to compression. A new approach to accomplish lossless hyperspectral image compression has been proposed. The imaging cube is subjected to pre-processing stage prior to entropy coding. Pre-processing stage comprises band normalization, ordering of bands followed by image scanning. A new sorting technique entitled Greedy Heap Sorting is suggested. The proposed strategy yields an average compression ratio (CR) of 4.93 and average bits per pixel (bpp) of 3.08. The proficiency of the system is on par with the existing contemporary algorithms for lossless hyperspectral image compression in terms of CR, bpp and reduced complexity.

KEYWORDS:

• Pre-processing
• band-reordering
• heap-sorting
• scanning
• correlation
• Huffman coder

Disclosure statement

No potential conflict of interest was reported by the authors.

Notes on contributors

A. S. Mamatha received her BE degree in Telecommunication Engineering from Dr. AIT, Bangalore and M.E in Electronics from UVCE, Bangalore in 2009 and is currently pursuing PhD programme at VTU Belgaum. She is currently working as Assistant professor in the Department of Electronics and communication engineering at R N Shetty Institute of Technology, Bangalore, India. Her research interest is in the Field of Multispectral Image compression, Signal processing. She has published 10 research papers in Journals and Conference Proceedings.

Vipula Singh received her BE degree in electronics from NIT Bhopal and MTech in electronics from NIT Nagpur in 2003 and PhD from School of Information Technology at Guru Gobind Singh IndraPrastha University New Delhi, India in 2009. In 1993, she joined Punjab Communications Ltd. as R&D engineer. In 2003, she joined as faculty in Appejay college of Engineering, Gurgaon and also worked as Assistant Professor in Electronics and communication department at PESIT Bangalore, Currently she is working as Professor and Head of Department, ECE at R N Shetty Institute of Technology, Bangalore. She has published more than 35 research papers in Journals and Conference Proceedings. Her research interests are Digital Image Processing, Pattern Recognition, Artificial Neural Networks, Digital signal processing and Ground Penetrating Radar.

Rajath Kumar M P was an undergraduate student in the Department of Electronics and communication engineering at R N Shetty Institute of Technology, Bangalore, India. He was working as a project assistant.

ORCID

A. S. Mamatha http://orcid.org/0000-0001-6265-8287

Vipula Singh http://orcid.org/0000-0001-5861-8768

Rajath Kumar M P http://orcid.org/0000-0001-6922-8220