Title:Underwater Optical Image Coding for Marine Health Monitoring Based on DCT
VOLUME: 16 ISSUE: 1
Author(s):Mohammad Kazem Moghimi and Farahnaz Mohanna*
Affiliation:Department of Communication Engineering, University of Sistan and Baluchestan, Zahedan, Department of Communication Engineering, University of Sistan and Baluchestan, Zahedan
Keywords:Marine health, underwater optical imaging, image compression, DCT, fast fourier transform, health monitoring.
Abstract:
Introduction: Optical imaging in the underwater environment to monitor marine objects
is now a hot topic of research which can be used for environmental healthcare systems
through the underwater ecosystem. Among different areas of research, image coding techniques
are widely applied to compress data for reliable communications. One of the challenges faced during
the underwater communications is having a low bit rate in acoustic links, particularly while
doing imaging in deep waters (in this condition, light needed for imaging is provided by a power
supply).
Materials and Methods: Two Dimensional-Discrete Cosine Transform (2D-DCT) is the main
technique that we want to use for image compression, to test two different patch sizes in 2D-DCT
to study the patch size effect on the quality of compression, execution time and preservation ability
of high-frequency information in edges.
Results: The results clearly show that a larger patch size can always be better in terms of computational
complexity, quality of coded images and also edge preservation when we use DCT for the
compression process.
Discussion and Conclusion: Although this research approves the approach of JPEG codec once
again for using the largest sub-image block in image compression (in terms of similarity and complexity),
however, the use of an edge preservation factor is a new finding for our research. On the
other hand, using the largest patch size is not a general approach for all image processing applications,
because some studies have shown that smaller patch may be more effective for some other
applications.
