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—Delay-sensitive video transmission over IEEE 802.11 wireless local area networks (WLANs) is analyzed in a cross-layer optimization framework. The effect of delay constraint on the quality of received packets is studied by analyzing " expired-time packet discard rate ". Three analytical models are examined and it is shown that M/M/1 model is quite an(More)
In this paper, we present a novel blind watermarking method with secret key by embedding ECG signals in medical images. The embedding is done when the original image is compressed using the embedded zero-tree wavelet (EZW) algorithm. The extraction process is performed at the decompression time of the watermarked image. Our algorithm has been tested on(More)
This paper presents the design of a novel wireless sensor network structure to monitor patients with chronic diseases in their own homes through a remote monitoring system of physiological signals. Currently, most of the monitoring systems send patients' data to a hospital with the aid of personal computers (PC) located in the patients' home. Here, we(More)
Digital radiology places very high demands on the networking and digital storage infrastructure of hospitals. In addition to having quite stringent requirements on the quality of the images displayed to the radiologist, much of the technical challenge resides in the necessity of displaying desired images as rapidly as possible. We present an infrastructure(More)
This paper describes the implementation of a multi-channel wireless EEG (Electroencephalogram) device to acquire and record EEG signals from the brain. Improvements to existing EEG devices include a greater number of channels whilst remaining portable, extending the range of wireless transmission to improve mobility and a reliable method of construction. An(More)