Correction circuit of a halftone dot area rate detector
AssigneeDainippon Screen Seizo Kabushiki Kaisha
InventorYasuhiro Yonekura
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Abstract
A correction circuit of a halftone dot area rate detector wherein a relation between a detected halftone dot area rate and a light transmittance or reflectance of an object obtained by a halftone photography is approximately expressed by a turning curve having at least one turning point, which comprises line segments, by using a turning point correction circuit comprising an inverting amplifying circuit, wherein another inverting amplifying circuit is coupled in parallel with the turning point correction circuit, and wherein a potensiometer couples the outputs of the two circuits and outputs a signal corresponding to a correction amount.
Claims2
A correction circuit of a halftone dot area rate detector wherein a relation between a detected halftone dot area rate and a light transmittance or reflectance of an object obtained by a halftone photography is approximately expressed by a turning curve having at least one turning point, which comprises line segments, by using a turning point correction circuit comprising an inverting amplifying circuit, the improvement which comprises:
- (a) another inverting amplifying circuit which is coupled in parallel with the turning point correction circuit;
- and
- (b) a potentiometer which couples the outputs of the two circuits and which outputs a signal corresponding to a correction amount.
Dependencies are inferred from the claim text.