University of Delaware

Charles Boncelet

Gonzalo R Arce

Xiang-Gen Xia

Electrical connection systems and methods are disclosed. An electrical system includes an electrical plug and an electrical receptacle. The electrical plug has at least one prong having at least one opening. The electrical receptacle has at least one socket, an electrical contact positioned within the at least one socket, a light source positioned to transmit light through the at least one socket, and a photodetector positioned to receive the light transmitted by the light source through the at least one socket. The electrical receptacle further has a microprocessor programmed to selectively couple the electrical contact with the power source based on the light received by the photodetector.

Safety connection electrical systems and methods

The present invention relates to multiresolution watermarking methods for digital images which are based on a discrete wavelet transform (DWT). Pseudo-random codes are added to the large coefficients located at the high and middle frequency bands of the DWT of a digital image. A peak is detected to signify a signature of the watermark. The methods taught herein are more robust then conventional methods for common image distortions, such as the wavelet transform based image compression, additive noise, image halftoning, and image resealing. Moreover, the method is hierarchal. The computational load needed to detect the watermark depends on the noise level in an image. The multiresolution and hierarchial watermarking method taught by the present invention results in lower computational loads, on average, while providing a high quality watermark which is utilizable with modern image/video compression standards.

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Newark, DE, United States of America

Charles Boncelet