Dynamic threshold device

Details Dynamic threshold device Dynamic threshold device

H - Electricity

04

N

350/14

H04N 1/403 (2006.01)

Patent

CA 1158761

ABSTRACT A thresholder for input signals, representing the optical density of elements of a two-dimensional density varying image, wherein transducer means produces series of such input signals, each series corresponding to density variations along a first dimension of the image, and wherein the improvement comprises: information storage means for storing a first reference amount and a plurality of second reference amounts; first means for combining an amount representing one of said input signals with the first reference amount in accordance with a function of the difference therebetween to produce an updated first reference amount and for operatively replacing in the storage means said firs-t reference amount with the updated first reference amount; second means for combining the updated first reference amount with a selected one of the second reference amounts to produce an updated second reference amount as a function of the difference therebetween and for operatively replacing in the storage means the selected one of said second reference amounts with the updated second reference amount; and comparison means for producing a binary output as a function of the relative magnitude of one of the input signal representing amounts and an updated second reference amount. CT9-80-001

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