Abstract
In this paper, overall system model, shown in Figure (1), of video compression-encryption-transmitter/decompression-dencryption-receiver was designed and implemented. The modified video codec system has used and in addition to compression/decompression, theencryption/decryption video signal by using chaotic neural network (CNN) algorithm was done. Both of quantized vector data and motion vector data have been encrypted by CNN. The compressed and encrypted video data stream has been sent to receiver by using orthogonal frequency division multiplexing (OFDM) modulation technique. The system model was designed according to video signal sample size of 176 × 144 (QCIFstandard format) with rate of 30 frames per second. Overall system model integrates and operates successfully with acceptable performance results.
Highlights
Compression of digital video signal becomes very important in video transmission applications because the amount of data associated especially for video signal is very huge to be handled by a limited bandwidth channel
One especially promising approach here is the Orthogonal Frequency Division Multiplexing (OFDM) which does provide high data rates over wireless channel, and supports a notion of resources sharing between multiple wireless terminals by dividing the wireless bandwidth into so-called “subcarriers”, which can be individually assigned to different terminals [8]
The video signal is compressed with constant quality for all video sequence so that the output bit rate is variable with time
Summary
Compression of digital video signal becomes very important in video transmission applications because the amount of data associated especially for video signal is very huge to be handled by a limited bandwidth channel. In addition to compression, providing a secure level of the transmitted data against unauthorized users is important, especially in applications that require a high level of protection such as medical, military, and entertainment applications. The data rate requirements are aggravated if multiple terminals demand video transmission from a signal access point, serving a given wireless cell. One especially promising approach here is the Orthogonal Frequency Division Multiplexing (OFDM) which does provide high data rates over wireless channel, and supports a notion of resources sharing between multiple wireless terminals by dividing the wireless bandwidth into so-called “subcarriers”, which can be individually assigned to different terminals [8].
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