Özet:
Nowadays, wireless sensor networks (WSNs) are widely used for the different
multimedia applications in which the data in multimedia form (e.g., images and videos)
are captured by visual sensors and transmitted to base station or destination nodes, and
such networks commonly called as wireless multimedia sensor networks (WMSN) to
transmit high-quality image over sensor nodes needing high throughput, less bit error
rate (BER) and more transmission rate with less consumption of energy parameters.
For WMSNs, energy efficiency and security are two major concerns as the high
dimensional and sensitive digital images consume more processing capabilities of
sensor nodes. Thus, it requires the development of energy-aware multimedia
processing algorithms to transmit digital images in WMSN without compromising
security and quality. The cooperative image transmission methodology over sensor
networks is proven to be an effective solution in the recent past.
In the first contribution of the thesis, we propose energy efficiency and quality-aware
multi-hop one-way cooperative image transmission framework based on image pre-
processing technique, wavelet-based two-dimensional discrete wavelet transform (2DDWT) methodology, and decode and forward (DF) algorithm at relay nodes.
In the second contribution, along with the image quality improvement and compressive
sensing (CS) technique, the security of CS data has been achieved. The one-way DF
based cooperative secure digital image transmission model over WSNs uses advanced
terminologies for image compression called optimization JPEG2000 compression, and
modified Elliptic curve cryptography (ECC) encryption is proposed.
In the final contribution of this thesis, one-way image transmission in the MIMO
communication model is proposed for secure digital image transmission over the WSNs.
The simulation results of each contribution of this thesis are presented in comparison
with the new state-of-art methods. The obtained results prove that the proposed digital
image transmission models provide an improvement in energy efficiency, security and service quality (QoS)
