Abstract: An automatic digital image characterization system has a feature extractor, including a segment processor and a feature processor. The segment processor is connected for receiving an image in the form of digitized pixel values; each pixel value having an amplitude and being associated with positional information in the form of column and row values. The feature processor converts the image information into column and row axis functions having calculated values of statistical mean amplitude and standard deviation. A system processor registers images, senses image changes, locates objects and detects hidden information.

Abstract: An automatic digital image characterization system has a feature extractor, including a segment processor and a feature processor. The segment processor is connected for receiving an image in the form of digitized pixel values; each pixel value having an amplitude and being associated with positional information in the form of column and row values. The feature processor converts the image information into column and row axis functions having calculated values of statistical mean amplitude and standard deviation. A system processor registers images, senses image changes, locates objects and detects hidden information.

Abstract: A device for effecting a generally tamper resistant threaded connection. The device includes a threaded fastener and a tool for driving and setting the fastener. The fastener has an internally threaded body portion, and a hollow cylindrical axially extending tool engaging portion spaced radially outward from the body portion and interconnected therewith. The tool engaging portion has a generally serrated driving surface defined by a plurality of circumferentially spaced recesses for receiving a like number of complementary shaped projections on the tool. The recesses and the projections cooperate to establish a driving connection between the fastener and the tool when the tool is turned in a direction for driving and setting the fastener. When the tool is turned in a direction for backing-off the fastener once it has been set, the recesses and the projections cooperate to slidingly eject the projections from the recesses to break the driving connection between the tool and the fastener.