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US 5,327,252 AGranted
Print evaluation apparatus
AssigneeCanon Kabushiki Kaisha
InventorsShinsuke Tsuruoka, Hiroshi Haruyama, Hideaki Uemura
Life of this patent
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Abstract
A print evaluating apparatus includes an image reader having a plurality of photoreceptors to read a print pattern line by line; a relative movement causing device for imparting relative movement between the print pattern and the image reader in a direction different from a direction in which the photoreceptors are arranged; and a processor for effecting plural operations in parallel for plural evaluation items for image signals corresponding to the print pattern supplied by the image reader during the relative movement, and for effecting evaluation on data provided by the operations.
Claims76
A print evaluating apparatus, comprising:
- reading means having a plurality of photoreceptors to read a print pattern line by line;
- relative movement means for imparting relative movement between the print pattern and said reading means in a direction different from a direction in which said photoreceptors are arranged;
- and
- processing means for effecting plural operations in parallel for plural evaluation items for image signals corresponding to the print pattern supplied by said reading means during the relative movement, and for effecting evaluation on data provided by the operations, wherein said print pattern has plural pattern areas corresponding to the plural evaluation items, and wherein said processing means effects the parallel operation for the respective pattern areas.
1 more element
A print evaluation apparatus, comprising:
- reading means for reading a print evaluation pattern having plural pattern areas corresponding to plural evaluation items;
- and
- processing means for effecting print evaluations for the plural evaluation items on the basis of image signals corresponding to the plural area patterns supplied from said reading means.
A print evaluation apparatus, comprising:
- first reading means having a plurality of photoreceptors to read a pattern on a print;
- second reading means having a plurality of photoreceptors to read the pattern;
- relative movement means for imparting relative movement between said first reading means and the print and between said second reading means and the print in a direction which is different from a direction in which said plural photoreceptors are arranged;
- first processing means for effecting first print evaluation on the basis of image signals supplied from said first reading means;
- and
- second processing means for effecting second print evaluation on the basis of image signals supplied from said second reading means;
- wherein said first and second reading means have different resolution powers.
4 more elements
A print evaluation apparatus, comprising:
- reading means having a plurality of photoreceptors to read a pattern line by line;
- relative movement means for imparting relative movement between the print pattern and said reading means in a direction which is different from a direction in which said photoreceptors are arranged;
- memory means for storing movement distance data relating to a movement distance imparted by said moving means in association with a reading timing of the operation of said reading means;
- and
- processing means for effecting print evaluation on the basis of image signals from said reading means and the movement distance data supplied during the relative movement.
2 more elements
A print evaluation apparatus, comprising:
- reading means for reading a line pattern having lines printed at a constant pitch in a direction of relative movement between printing means and a print on which the pattern is printed;
- projecting means for determining projective data of image signals supplied from said reading means in a direction of length of the lines;
- processing means for determining pitch data relating to a pitch of the lines on the basis of the projective data and effecting an evaluation relating to the relative movement on the basis of the pitch data.
A print evaluation apparatus, comprising:
- reading means for reading a line pattern having lines printed at a constant pitch on a print in a direction of relative movement between printing means and the print;
- projection means for providing projective data of image signals from said reading means in a direction of length of the lines;
- and
- processing means for determining constrast data relating to a contrast between the line and a background on the basis of the projective data and for effecting an evaluation on the basis of the contrast data.
1 more element
A print evaluation apparatus, comprising:
- reading means having a plurality of photoreceptors for reading a pattern on a print line by line;
- relative movement means for imparting relative movement between said reading means and the print in a direction which is different from a direction in which the photoreceptors are arranged;
- and
- processing means for determining end position information of the print and pattern position information of the pattern on the basis of image signals supplied from said reading means during the relative movement, for processing the end position information and the pattern position information to determine a positional relation between the end of the print and the pattern, and for evaluating a print position accuracy.
1 more element
A print evaluation apparatus, comprising:
- reading means having a plurality of photoreceptors to read a printed line pattern line by line;
- relative movement means for imparting relative movement between said reading means and the line pattern in a direction different from a direction in which the plural photoreceptors are arranged;
- calculating means for calculating first information relating to an end position of the line pattern and second information relating to a width of the pattern on the basis of the image signals supplied from said reading means during the relative movement;
- and
- processing means for effecting linearity evaluation of the line pattern on the basis of central position information determined from said first information and second information and on the basis of a line to which the line pattern is approximated.
2 more elements
A print evaluating method, comprising the steps of:
- a first step of imparting relative movement between a print patten and a reading means which reads the print pattern in a direction different from a direction in which a plurality of photoreceptors of the reading means are arranged, the print pattern having plural areas corresponding to plural evaluation items;
- a second step of effecting plural operations in parallel for plural evaluation items for an image signal, corresponding to the print pattern, output from said reading means during the relative movement of said first step;
- and
- a third step of effecting an evaluation with respect to the evaluation items on the basis of data provided by the operations of said second step.
1 more element
A print evaluating method, comprising the steps of:
- a first step of reading, using reading means, a print pattern on a print including plural measurement regions corresponding to plural evaluation items;
- and
- a second step of effecting evaluations with respect to the plural evaluation items on the basis of an image signal corresponding to the plural measurement regions produced by the reading means.
A print evaluating method, comprising the steps of:
- a first step of reading a print pattern on a print using first reading means with a first measurement resolution power;
- a second step of reading the print pattern using second reading means with a second measurement resolution power which is different from the first measurement resolution power;
- a third step of effecting a first print evaluation on the basis of an image signal corresponding to the print pattern read in said first step;
- and
- a fourth step of effecting a second print evaluation, which is different from the first evaluation, on the basis of an image signal corresponding to the print pattern read in said second step.
2 more elements
A print evaluating method, comprising the steps of:
- a first step of imparting relative movement between a print pattern and a reading means in a direction different from a direction in which a plurality of photoreceptors of the reading means are arranged;
- a second step of storing data of a distance of the movement in said first step in association with a read timing of said reading means;
- a third step of effecting a print evaluation on the basis of (i) an image signal from said reading means during the relative movement and (ii) the stored data.
A print evaluating method, comprising the steps of:
- a first step of reading a pattern comprising lines on a print, the lines being printed at predetermined intervals in a direction of relative movement between the print and a reading means;
- a second step of obtaining projective data in a direction of a length of the line pattern on the basis of an image signal corresponding to the line pattern read in said first step;
- a third step of obtaining interval data relating to the intervals of the line pattern on the basis of the projective data obtained in said second step;
- a fourth step of effecting an evaluation of the relative movement on the basis of the interval data obtained in said third step.
1 more element
A print evaluating method, comprising the steps of:
- a first step of reading a pattern comprising lines on a print, the lines being printed at predetermined intervals in a direction of relative movement between the print and a reading means;
- a second step of obtaining projective data in a direction of a length of the line pattern on the basis of an image signal corresponding to the line pattern read in said first step;
- a third step of obtaining contrast data relating to a contrast of the lines and a background thereof on the basis of the projective data obtained in said second step;
- a fourth step of effecting an evaluation of the printing on the basis of the contrast data obtained in said third step.
1 more element
A print evaluating method, comprising the steps of:
- a first step of imparting relative movement between a print and a reading means in a direction different from a direction in which a plurality of photoreceptors of the reading means are arranged, the print having a predetermined print pattern;
- a second step of obtaining end position information of the print and pattern position information on the basis of an image signal from said reading means during the relative movement of said first step;
- and
- a third step of effecting an evaluation of print position accuracy on the basis of the end position information of the print and the pattern position information.
1 more element
A print evaluating method, comprising the steps of:
- a first step of reading a line pattern on a print by a reading means having plural photoreceptors;
- a second step of obtaining first information on an end position of the line pattern and second information on a width of a line pattern on the basis of an image signal output from said reading means;
- a third step of obtaining information on a center position of the line pattern and an approximated line on the basis of the first information and the second information;
- and
- a fourth step of evaluating a linearity of the line pattern from the center position information and the approximated line obtained in said third step.
2 more elements
Dependencies are inferred from the claim text.