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US 4,736,315 AGranted
Apparatus for evaluating density and evenness of printed patterns
AssigneeFujitsu Limited
InventorsTohru Ozaki, Takashi Toriu, Hiromichi Iwase
Life of this patent
Estimating the term…
Abstract
An apparatus for evaluating density-evenness of patterns printed on an article includes a circuit for calculating density distribution of the image data in each segment; a circuit for normalizing the density distribution with an area of effective image data in each segment; and a circuit for quantifying the density and evenness of the patterns.
Claims15
An apparatus for evaluating density and eveness of patterns printed on an article comprising:
- means for receiving a plurality of image data representing said patterns which are divided into a plurality of segments and for calculating the density distribution of image data in each segment;
- means for determining effective segments which are segments that comprises valid data and for normalizing said density distribution of each effective segment;
- and
- means for quantifying the density and evenness of said patterns printed on said article on the basis of density distributions normalized by said normalizing means.
1 more element
An apparatus for evaluating density and evenness of patterns printed on an article comprising:
- means for receiving a plurality of image data representing said patterns which are divided into a plurality of segments;
- means for calculating the density distribution of plurality of image data in each segment;
- means for normalizing said density distribution with an area of effective image data in each segment;
- and
- means for quantifying the evenness of the patterns on the basis of said normalized density distributions;
- wherein said density distribution calculating means includes
- a differential circuit receiving said plurality of image data in each segment and producing differential values thereof;
- a first discriminating-converting circuit receiving said differential values, discriminating the received differential values with a predetermined value, and converting the received differential values into a specific value in response to said discrimination;
- a second discriminating-converting circuit receiving said plurality of image data in each segment, discriminating the received image data with a predetermined value, and converting the received image data into a specific value in response to said discrimination;
- a circuit for finding an effective domain of the printed patterns by synthesizing signals output from said first and second discriminating-converting circuits;
- and
- means for calculating a density histogram of the image data with reference to the effective domain.
9 more elements
Dependencies are inferred from the claim text.