Patent application number | Description | Published |
20080309703 | DOT MEASUREMENT METHOD AND APPARATUS - A dot measurement method includes: a line pattern forming step of forming line patterns on the ejection receiving medium; a pattern reading step of capturing an image of the line patterns; a profile graph acquiring step of acquiring profile graphs for each of the line patterns; a characteristic position calculating step of calculating extreme value positions, first edge positions and second edge positions for each of the line patterns; an approximation line calculating step of calculating a line-center approximation line, a first edge approximation line and a second edge approximation line; a line width calculating step of calculating a line width; a correlation information acquiring step of beforehand acquiring at least one of a first relationship between the line width and the dot diameter, and a second relationship between the line width and the ejection volume; and a measurement value calculating step of calculating at least one of the dot diameter and the ejection volume in accordance with the line width and the at least one of the first and second relationships. | 12-18-2008 |
20100079518 | DOT POSITION MEASUREMENT METHOD, DOT POSITION MEASUREMENT APPARATUS, AND COMPUTER READABLE MEDIUM - A dot position measurement method includes: a line pattern formation step of recording dots continuously by a plurality of recording elements of a recording head while performing relative movement between the recording head and a recording medium in such a manner that a measurement line pattern including a plurality of lines of rows of the dots respectively corresponding to the plurality of recording elements is formed on the recording medium; a reading step of reading the measurement line pattern formed on the recording medium with an image reading apparatus in a state where a longitudinal direction of the plurality of lines of the measurement line pattern are directed to a sub-scanning direction of the image reading apparatus and a reading resolution in the sub-scanning direction of the image reading apparatus is lower than a reading resolution in a main scanning direction of the image reading apparatus in such a manner that an electronic image data indicating a read image of the measurement line pattern is acquired; a region allocating step of allocating a plurality of averaging regions where an image signal on the read image is averaged in terms of the sub-scanning direction, to different positions in terms of the sub-scanning direction of each of line blocks, each line block including the lines arranged in the main scanning direction; an average profile image forming step of averaging the image signal in terms of the sub-scanning direction in each of the plurality of averaging regions that have been allocated to the different positions and creating average profile images for positions in terms of the main scanning direction; an edge position determination step of determining positions of both edges of each of the lines according to the average profile images; an averaging region position determination step of determining positions of the lines in the plurality of averaging regions according to the positions of the both edges determined in the edge position determination step; and a line block position determination step of determining positions of the lines in the line blocks according to the positions of the lines in the plurality of averaging regions determined according to the average profile images corresponding to the plurality averaging regions respectively. | 04-01-2010 |
20100079524 | INKJET RECORDING APPARATUS, COLOR CORRECTION METHOD AND COMPUTER-READABLE MEDIUM - An inkjet recording apparatus includes: a treatment liquid deposition device which deposits a treatment liquid insolubilizing or aggregating inks of a plurality of colors, onto a recording medium; a recording head which has a plurality of nozzles ejecting the inks onto the recording medium on which the treatment liquid has been deposited; a data acquisition device which acquires density data of an image with respect to each color, the density data corresponding to the plurality of colors; a higher-order color correction device which corrects the density data, wherein when the inks of different colors are ejected in ejection order so that a preceding ink ejected precedingly to form a lower layer and a subsequent ink ejected subsequently to form an upper layer overlap each other, the higher-order color correction device corrects the density data for a nozzle ejecting the subsequent ink according to the density data for a nozzle ejecting the preceding ink; and an ejection controller which controls ejection of the inks from the recording head according to the density data that the higher-order color correction device has corrected in such a manner that the image is formed on the recording medium. | 04-01-2010 |
20100079774 | DOT POSITION MEASUREMENT METHOD, DOT POSITION MEASUREMENT APPARATUS, AND COMPUTER READABLE MEDIUM - A dot position measurement method includes: a line pattern formation step of recording dots on a recording medium continuously by a plurality of recording elements of a recording head while performing relative movement between the recording head and the recording medium in such a manner that a measurement line pattern including a plurality of lines of rows of the dots corresponding to the plurality of recording elements respectively is formed on the recording medium, the measurement line pattern having a plurality of line blocks including recording line blocks and a reference line block, each of the recording line blocks including a group of the lines recorded by the recording elements spaced by a prescribed distance in a direction in which the plurality of recording elements are substantially arranged and which is perpendicular to a direction of the relative movement of the recording head, the reference line block including a group of the lines recorded by the recording elements selected from the recording elements for each of the recording line blocks; a reading step of reading the measurement line pattern on the recording medium formed in the line pattern formation step with an image reading apparatus in a state where a longitudinal direction of the plurality of lines of the measurement line pattern are directed to a sub-scanning direction of the image reading apparatus in such a manner that an electronic image data indicating a read image of the measurement line pattern is acquired; a line block position determination step of determining positions of the respective lines in each of the plurality of line blocks according to the read image acquired in the reading step; and a position correction step of correcting the positions of the respective lines in each of the recording line blocks determined in the line block position determination step, according to the reference line block. | 04-01-2010 |
20100238223 | DOT POSITION MEASUREMENT METHOD AND APPARATUS, AND COMPUTER READABLE MEDIUM - The dot position measurement method includes: a line pattern forming step of forming a measurement line pattern including a plurality of lines formed by dot sequences corresponding to respective recording elements on a recording medium, by continuously recording dots by the recording elements while causing a recording head having the recording elements and the recording medium to move relatively to each other in a relative movement direction, the measurement line pattern including: a plurality of line blocks each constituted of a group of lines to be recorded using the recording elements spaced a prescribed interval apart in an effective direction of alignment of the recording elements which is perpendicular to the relative movement direction, the line blocks being formed at mutually different positions in a lengthwise direction of the lines on the recording medium; and a reference line block containing lines to be recorded by the recording elements which are common respectively with the recording elements forming the line blocks; a reading step of reading the measurement line pattern formed on the recording medium in the line pattern forming step by an image reading device, and acquiring electronic image data representing a read image of the measurement line pattern; a position-in-line-block identifying step of identifying line positions in each of the line blocks and the reference line block, from the read image acquired in the reading step; and a position correcting step of correcting the line positions of the line blocks determined in the position-in-line-block identifying step in accordance with the reference line block, by employing a correction function using a piecewise polynomial expression. | 09-23-2010 |
20100238459 | DOT POSITION MEASUREMENT METHOD AND APPARATUS, AND COMPUTER READABLE MEDIUM - The dot position measurement method includes: a line pattern forming step of forming a measurement line pattern including a plurality of lines formed by dot sequences corresponding to respective recording elements on a recording medium, by continuously recording dots by the recording elements while causing a recording head having the recording elements and the recording medium to move relatively to each other in a relative movement direction, the measurement line pattern including a plurality of line blocks each constituted of a group of lines to be recorded using the recording elements spaced a prescribed interval apart in an effective direction of alignment of the recording elements which is perpendicular to the relative movement direction, the line blocks being formed at mutually different positions in a lengthwise direction of the lines on the recording medium; a reading step of reading the measurement line pattern formed on the recording medium in the line pattern forming step by an image reading device, and acquiring electronic image data representing a read image of the measurement line pattern; a position-in-line-block identifying step of identifying line positions in each of the line blocks, from the read image acquired in the reading step; a function determination step of providing a temporary recording element number corresponding to the line positions within each of the line blocks, and obtaining a function representing a relationship between the temporary recording element number and the line positions for each of the line blocks; a determination step of determining whether there is an error in the temporary recording element number for each of the line blocks, between the line blocks, in accordance with the function obtained for each of the line blocks; and a recording element position specifying step of changing the temporary recording element number of at least one of the line blocks which is determined to have the error in the temporary recording element number in the determination step, and specifying a correspondence relation between the line positions within each of the line blocks and the recording elements. | 09-23-2010 |
20110085184 | DOT POSITION MEASUREMENT METHOD AND DOT POSITION MEASUREMENT APPARATUS - A dot position measurement method includes: a line pattern forming step of forming a measurement line pattern including a plurality of lines of rows of dots corresponding to a plurality of recording elements arranged in a first direction of a recording head respectively, on a recording medium, while causing relative movement between the recording head and the recording medium in a second direction perpendicular to the first direction, the measurement line pattern including a plurality of line blocks each including a group of the lines recorded by the recording elements spaced at a prescribed interval in the first direction, and a plurality of common line blocks each including the lines recorded by the recording elements which are same as the recording elements recording the lines included in the plurality of line blocks respectively; a reading step of reading an image of the measurement line pattern formed on the recording medium in the line pattern forming step, by an image reading apparatus; a line position measurement step of measuring positions of the lines included in the plurality of line blocks and the plurality of common line blocks, from the image of the measurement line pattern read by the image reading apparatus; an averaging step of determining average values of measurement values of positions of the lines recorded by the same recording elements among the plurality of common line blocks; and a line position correction step of correcting the measurement values of the positions of the lines according to the average values. | 04-14-2011 |
20110227988 | FINE PATTERN POSITION DETECTION METHOD AND APPARATUS, DEFECTIVE NOZZLE DETECTION METHOD AND APPARATUS, AND LIQUID EJECTION METHOD AND APPARATUS - A fine pattern position detection method includes: a reading step of reading line patterns formed on a recording medium, at a prescribed read pixel pitch in a prescribed reading direction to acquire read data; a read pixel position acquisition step of acquiring from the read data corresponding positions of the line patterns based on the read pixel pitch; a characteristic value acquisition step of acquiring, from the read data, characteristic values at the corresponding positions of the line patterns and characteristic values at adjacent pixel positions which are adjacent to each of the corresponding positions of the line patterns according to the read pixel pitch; a candidate position output step of applying the characteristic values at the corresponding positions of the line patterns and the characteristic values at the adjacent pixel positions, to a position table in which the characteristic value at each of the corresponding positions of the line patterns and the characteristic values at the adjacent pixel positions are associated with a candidate position which is a candidate position having highest possibility of arrangement of each of the line patterns and which is assigned at a distance shorter than the read pixel pitch from the corresponding position of each of the line patterns, so as to output the candidate position of each of the line patterns; and a recording position acquisition step of calculating a recording position of each of the line patterns on the recording medium, from the corresponding position of each of the line patterns based on the read pixel pitch and the output candidate position of each of the line patterns. | 09-22-2011 |
20140090569 | PRINTING RELIEF PLATE, PRINTING RELIEF PLATE PRODUCING APPARATUS, PRINTING APPARATUS, PRINTING PRESSURE DETERMINING APPARATUS, AND METHODS THEREFOR - On a printing relief plate, which is produced by a printing relief plate producing apparatus and a printing relief plate producing method, convexities and detecting portions are set to be lower than a solid area of the printing relief plate. In the event that a detecting portion image and a solid area image are printed on a print medium using the printing relief plate by a printing apparatus and by carrying out a printing method, in a printing pressure determining apparatus and a printing pressure determining method, it is determined whether a printing pressure is an appropriate printing pressure or not by comparing an optical density of the detecting portion image and an optical density of the solid area image. | 04-03-2014 |
Patent application number | Description | Published |
20090085952 | TEST CHART, TEST CHART MEASUREMENT METHOD, AND TEST CHART MEASUREMENT APPARATUS - A test chart is recorded on a recording medium by means of a line head having a plurality of recording elements by causing the plurality of recording elements to perform recording operation while moving the recording medium and the line head relatively to each other in a relative movement direction. The test chart includes: a line pattern block which includes a plurality of line patterns respectively corresponding to the plurality of recording elements, the plurality of line patterns being arranged at a prescribed interval or above so as to be separated from each other, wherein the plurality of line patterns include reference line patterns arranged on both end regions of the line pattern block, the reference line patterns having line characteristic quantities different from the others of the plurality of line patterns. | 04-02-2009 |
20120154477 | DEFECTIVE RECORDING ELEMENT DETECTING APPARATUS, DEFECTIVE RECORDING ELEMENT DETECTING METHOD, AND IMAGE FORMING APPARATUS - A defective recording element detecting apparatus includes: an image signal acquiring device which acquires read image signals obtained by reading, a linear test pattern recorded by an image recording apparatus having: a recording head and a medium conveying device which causes relative movement between a recording medium and the recording head in a signal decomposing device which sequentially assigns reading pixel numbers 0 to n to the acquired read image signals, divides the reading pixel numbers by an analysis pitch unit PS to obtain remainders, and decomposes the read image signals into an image signal of each of the obtained remainders; a fluctuation signal calculating device which calculates a fluctuation signal of each of the remainders; and an identifying device which identifies a defective recording element among the plurality of recording elements based on the fluctuation signal of each of the remainders. | 06-21-2012 |
20120154837 | DEFECTIVE RECORDING ELEMENT DETECTING APPARATUS AND METHOD, AND IMAGE FORMING APPARATUS AND METHOD - A defective recording element detecting apparatus includes: a read image data acquiring device which acquires read image data of a test pattern recorded on a recording medium by a recording head having recording elements; a reference area setting device which sets a reference area including a part of the test pattern on a read image representing image contents of the read image data; a comparison area setting device which sets a comparison area on the read image; a correlation operation device which performs a correlation operation between the comparison area and the reference area; a distortion correction value determining device which determines a distortion correction value, from a result of the correlation operation; an image distortion correcting device which corrects image distortion of the read image using the distortion correction value; and a defective recording element determining device which identifies a defective recording element according to the corrected read image. | 06-21-2012 |
20120250040 | RECORDING POSITION ERROR MEASUREMENT APPARATUS AND METHOD, IMAGE FORMING APPARATUS AND METHOD, AND COMPUTER-READABLE MEDIUM - A recording position error measurement apparatus includes a read image signal acquisition device and a signal processing device having: a dividing device which divides pixel series of the read image signal into sequences having different remainder values so as to generate image signals of the respective sequences; a prediction signal generation device which calculates regular prediction signals which are predicted with respect to the respective sequences, according to the read image signal; a threshold value determination device which determines tone value differences corresponding to respective distances representing recording position errors from the prediction signals, and which determines threshold values corresponding respectively to the recording position errors, from the tone value differences; a change signal calculation device which calculates a change signal indicating a difference between the prediction signal and the image signal of each of the sequences; and an error distance calculation device which specifies the recording position errors of the plurality of recording elements in the recording head according to comparing the change signal with each of the threshold values. | 10-04-2012 |