Arrangement for examining objects
First Claim
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1. A device for examining objects for regions whose emission, absorption or reflection deviates from that of the surrounding regions, comprising:
- scanning means which scan the object, line-by-line, and supply a scanning signal depending on the emission, absorption or reflection;
means for generating a binary identification signal when a region whose emission, absorption or reflection considerably deviates from that of the surrounding regions is scanned;
coding means which produce binary sample signals corresponding to samples of said identification signal at a plurality of discrete positions on said scan lines, the logic level of said sample signals assuming a first value when the identification signal is present and a second value when the identification signal is not present;
a store connected to receive the sample signals;
a gate means which produce a relative shift of at least one discrete position between sample signals associated with successive lines and which combine said shifted sample signals by ORing logic levels of said first value; and
evaluation means which process the result of said combination and which activate a signal upon the occurrence therein of several consecutive logic levels associated with the identification signal.
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Abstract
An arrangement for detecting foreign objects in products. The products are X-rayed to produce a quantized raster scanned signal. The samples thus obtained for each line are combined with the bit samples of the next line, shifted by at least one position, and the output signal is applied to an evaluation arrangement which supplies an alarm signal when a foreign object is present.
17 Citations
5 Claims
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1. A device for examining objects for regions whose emission, absorption or reflection deviates from that of the surrounding regions, comprising:
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scanning means which scan the object, line-by-line, and supply a scanning signal depending on the emission, absorption or reflection; means for generating a binary identification signal when a region whose emission, absorption or reflection considerably deviates from that of the surrounding regions is scanned; coding means which produce binary sample signals corresponding to samples of said identification signal at a plurality of discrete positions on said scan lines, the logic level of said sample signals assuming a first value when the identification signal is present and a second value when the identification signal is not present; a store connected to receive the sample signals; a gate means which produce a relative shift of at least one discrete position between sample signals associated with successive lines and which combine said shifted sample signals by ORing logic levels of said first value; and evaluation means which process the result of said combination and which activate a signal upon the occurrence therein of several consecutive logic levels associated with the identification signal. - View Dependent Claims (2, 3, 4, 5)
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Specification