Method of and apparatus for determining the sharpness of a pictu

Details Method of and apparatus for determining the sharpness of a pictu Method of and apparatus for determining the sharpness of a pictu

1976-12-07

1978-10-31

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

3401463MA, 356124, 358130, 364515, H04N 702, H04N 530

Patent

active

041237781

ABSTRACT:
Method and apparatus for determining the sharpness of a picture through evaluation of the absolute values of the density differences between adjacent points of the image in at least one selected area of the image. The absolute values are measured and compared with at least two threshold values. The absolute difference values obtained as a result of the comparison are then counted when they exceed the threshold values. The counts thus obtained are compared with reference count values to produce a decision output and when a plurality of decision outputs are obtained, these are combined to arrive at a decision as to the sharpness of the image.

REFERENCES:
patent: 3805239 (1974-04-01), Watanabe
patent: 3981579 (1976-09-01), Weinert et al.

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