A new, cellular automata-based, symmetric cipher and its archtecture are described in this paper. Using 16 bit words through non-autonomous cellular automata (CA), the cipher can provide data rates of 320 MBits per second at a clock rate... more
A new, cellular automata-based, symmetric cipher and its archtecture are described in this paper. Using 16 bit words through non-autonomous cellular automata (CA), the cipher can provide data rates of 320 MBits per second at a clock rate of 20 MHz. By employing involutions, unidirectional data flow is maintained through the cipher. A 96-bit autonomous CA is used to store the secret key and this evolves as data are introduced into the cipher. Such CA techniques are conducive to VLSI implementation due to modularity, parallelism and local communications.
Ciphers are applied to provide security for communications and data storage systems. A new, cellular automata-based, symmetric cipher and its architecture are described. Using 16 bit words through non-autonomous cellular automata (CA),... more
Ciphers are applied to provide security for communications and data storage systems. A new, cellular automata-based, symmetric cipher and its architecture are described. Using 16 bit words through non-autonomous cellular automata (CA), the cipher can provide data rates of 320 Mbits per second at a clock rate of 20 MHz. By employing involutions, unidirectional data flow is maintained through the cipher. A 96-bit autonomous CA is used to store the secret key and this evolves as data are introduced into the cipher. Such CA techniques are conducive to VLSI implementation due to modularity, parallelism and local communications
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The design and implementation of a communication system for an underwater remotely operated vehicle (ROV) are presented. The system is assumed to be composed of a remotely operated vehicle driven by a set of seven thrusters, a tethering... more
The design and implementation of a communication system for an underwater remotely operated vehicle (ROV) are presented. The system is assumed to be composed of a remotely operated vehicle driven by a set of seven thrusters, a tethering cable including power supply cables and two fibres for communication (the function of which is to transmit and monitor information) and a
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The implementation of a fuzzy logic controller for I-D motion control is presentred in this paper. Two difSerent control schemes are described. The first one uses a pure fuuy controller, its output being the control signal for the system.... more
The implementation of a fuzzy logic controller for I-D motion control is presentred in this paper. Two difSerent control schemes are described. The first one uses a pure fuuy controller, its output being the control signal for the system. The 7x7 fuzzy matrix assigns the controller output with respect t(o the error value and its derivative. The control curve of
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ABSTRACT This paper presents the design and VLSI implementation, on a single chip, of a new real-time colour space converter, which performs the transformation of the RCB colour coordinates to the intensity, hue and saturation (IHS)... more
ABSTRACT This paper presents the design and VLSI implementation, on a single chip, of a new real-time colour space converter, which performs the transformation of the RCB colour coordinates to the intensity, hue and saturation (IHS) colour space. This high speed VLSI chip is designed to work at 13.3 MHz and can process high resolution colour images of up to 697 pixels per horizontal line. Its minimum rate of operation is 133 MIPS. The high speed of opera- tion was achieved by pipelining the data in a vector fashion. The chip was implemented using a DLM, 1 .O/*m, N-well, CMOS pro- cess provided by European Silicon Structures and the die size dimensions for the chip are 5.669 mm x 6.144 mm = 34.830 mm'. The chip is intended to be used as the front end of colour machine vision systems in inspection tasks and in autonomous applications, where the need for short processing times is crucial. Finally, simulation results exhibiting the usefulness of the IHS colour space transform using the proposed ASIC and real colour image data are also presented.
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A new image enhancement technique using the Intensity, Hue and Saturation (lIHS) colour space is presented in this letter Experimental results illustrating the enhancement capabilities of the proposed technique are given. Comparative... more
A new image enhancement technique using the Intensity, Hue and Saturation (lIHS) colour space is presented in this letter Experimental results illustrating the enhancement capabilities of the proposed technique are given. Comparative examples of the proposed technique to the grey level histogram equalisation technique are also included.
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The design of a digital ultrasonic scanning system for positioning underwater remotely operated vehicles (UROVs) is presented in this paper. Its principle of operation is based on ultrasonic distance measurements (by determining the time... more
The design of a digital ultrasonic scanning system for positioning underwater remotely operated vehicles (UROVs) is presented in this paper. Its principle of operation is based on ultrasonic distance measurements (by determining the time of flight) and mechanical scanning. Ultrasonic imaging is used to construct the 3-D image of the environment surrounding the vehicle. The image is then used, in combination with signals coming from a gyroscope, to estimate the actual distances of the vehicle from the objects in the vicinity of the vehicle. The system consists of a 200 KHz point transducer, a scanning transmitter-receiver unit and a computer for image reconstruction and control of the UROV. The main advantages of this system are its simplicity and its accurate large scale measurement capability. The design of the system was carried out in order to conform directly with the computer controlling the UROV, and its operation was experimentally demonstrated.
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The design and implementation, using custom ICs, of a new real-time vector pipeline colour space transformer, which performs the transformation of the RGB colour coordinates to chromaticity coordinates is presented. Its minimum rate of... more
The design and implementation, using custom ICs, of a new real-time vector pipeline colour space transformer, which performs the transformation of the RGB colour coordinates to chromaticity coordinates is presented. Its minimum rate of operation is 66-5 MIPS and it can handle high resolution colour images of up to 682pizels per horizontal line. The high speed of operation was achieved
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Page 1. Optical power distribution in wireless infrared LANs GN Bakalidis E. Glavas Ph. Tsalides ... 143, No. 2, April 1996 trol devices and outdoor optical communication applications [9]. Nondirectional infrared links are not susceptible... more
Page 1. Optical power distribution in wireless infrared LANs GN Bakalidis E. Glavas Ph. Tsalides ... 143, No. 2, April 1996 trol devices and outdoor optical communication applications [9]. Nondirectional infrared links are not susceptible to optical alignment problems. ...
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