Abstract: In this paper, we propose a novel (n,n) secret image sharing scheme. Both the construction and revealing of shares are based on matrix addition. In this paper, we have analyzed the secret image sharing scheme proposed by Dong and Ku [8] and improved it. The method [8] was applicable only for square images. The shares generated for a complete black image were themselves completely black; they were not random which made it a (1, n) secret sharing scheme. In case of images having completely single color other than the color black, the shares were having strip patterns rather than being random. Our proposed scheme is applicable for any size of image, has no pixel expansion and can reconstruct the secret image precisely. Our scheme includes no matrix multiplication for construction of shares, rather works on simple matrix addition which reduces the computational complexity. The scheme can be directly applied for any of the binary, grayscale or color image. Experimental results show that our

• Publication Date: 09-Jul-2012
• DOI: 10.15224/978-981-07-2950-9-9699
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Abstract: This paper proposes a wireless stepper motor controller designed using Very High Speed Integrated Circuit Hardware Description Language (VHDL) and is implemented on DE0 Altera Field Programmable Gate Array (FPGA). The proposed controller uses the Pulse- Width Modulation (PWM) technique to rotate the motor through the desired angle, speed and direction. Using the proposed controller it is possible to rotate the stepper motor precisely. In addition, the motor has been operated with a speed ranging from 5.625° per second to 20° per second in either clockwise or anticlockwise direction. Features such as manual rotation, to rotate the motor in directional mode, to pause the rotation, to execute the rotation with varying speed at desired region, return-to-zero, and zero position detection have been incorporated in the design. This proposed controller has been designed to operate wirelessly using Zigbee transreceiver module. More over the complete controller can be redesigned and realized in

• Publication Date: 09-Jul-2012
• DOI: 10.15224/978-981-07-2950-9-9706
• Views: 0
• Downloads: 0