WO2006004165A1 - データ処理方法、データ処理装置、マスク製造方法およびマスクパターン - Google Patents
データ処理方法、データ処理装置、マスク製造方法およびマスクパターン Download PDFInfo
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- WO2006004165A1 WO2006004165A1 PCT/JP2005/012514 JP2005012514W WO2006004165A1 WO 2006004165 A1 WO2006004165 A1 WO 2006004165A1 JP 2005012514 W JP2005012514 W JP 2005012514W WO 2006004165 A1 WO2006004165 A1 WO 2006004165A1
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- mask
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- pattern
- dots
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
- B41J29/38—Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K15/00—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers
- G06K15/02—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers
- G06K15/10—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers by matrix printers
- G06K15/102—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers by matrix printers using ink jet print heads
- G06K15/105—Multipass or interlaced printing
- G06K15/107—Mask selection
Definitions
- the present invention relates to a data processing method, a data processing apparatus, a mask manufacturing method, and a mask pattern. More specifically, the present invention relates to a case where ink dots constituting a recording image are divided and formed by a plurality of recording head scans. The present invention relates to mask processing or mask pattern for generating the dot recording data.
- the multi-pass printing method is a method in which when an arbitrary area of an image is viewed, the ink dots constituting the image in that area are divided and formed by a plurality of scans of the print head. According to this method, unevenness in density due to variations in ejection performance, such as the direction of ink ejection for each nozzle (or ejection port) that ejects ink, and recording paper conveyance errors, etc. can be distributed to multiple scans. Can do. As a result, it is possible to record a high-quality image in which density unevenness is not noticeable.
- the generation of dot recording data for forming a plurality of ink dots constituting a recording image by dividing it into a plurality of scans generally uses a mask pattern (also simply referred to as “mask”). Performed by mask processing. As shown in FIG. 5 to be described later, the mask pattern includes pixels that allow recording (hereinafter also referred to as “recording allowable pixels”) and pixels that do not allow recording (hereinafter also referred to as “non-recording allowable pixels”). Are arranged.
- the print permitting pixels correspond to the portions shown in black in FIG. 5, and the non-recording allowance pixels correspond to the portions shown in white.
- various purposes such as adjusting the number of dots to be printed in each of the multiple scans and eliminating the density unevenness described above. It can take the form according to.
- Patent Document 2 the arrangement of the printable pixels in the mask pattern is made random, and a mask pattern having such randomness (hereinafter also referred to as a random mask) is used to obtain image data. Interference is happening. This improves the above problem.
- Patent Document 1 the arrangement of the print permitting pixels in the mask pattern is excellent in dispersibility, and the deviation of the dot formation position during bidirectional recording using such a highly dispersive mask pattern is proposed. It is described that the degradation of image quality due to the above is suppressed.
- the arrangement of the print permitting pixels in the mask described in the document is well dispersed using the concept of repulsive potential.
- this mask pattern is generated so as to avoid as close as possible the dots that are formed by using the mask pattern from each other. There are few frequency components.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2002-144552
- Patent Document 2 JP-A-7-052390
- Patent Document 3 Japanese Patent Laid-Open No. 2002-96455
- FIGS. 86 (a) to 86 (c) are diagrams for explaining this problem.
- This figure shows the process in which each ink is driven into the recording medium in the order of cyan, magenta, and yellow in a certain scan in multi-pass printing.
- cyan ink is first ejected onto a recording medium on which nothing has yet been printed.
- the position where each cyan ink is applied follows the arrangement of the print permitting pixels of the mask used.
- the cyan ink droplet 10C exists on the recording medium in an arrangement according to the mask.
- magenta ink is similarly ejected to a position according to the corresponding mask, and similarly, ink droplets 10M are formed before absorption.
- the ink droplet 10B in which the cyan ink droplet 10C and the magenta ink droplet 10M are connected in contact with each other (marked with X in the figure). May be formed).
- the ink droplet 10Y is formed before being absorbed by being ejected to the position according to the corresponding mask.
- connected ink droplets 10B are formed according to the relationship of the printable pixel arrangement of the mask used for each ink.
- ink droplets may be ejected in the same pixel, forming similar connected ink droplets.
- ink droplets that are sequentially ejected are applied to adjacent or adjacent pixels or the same pixel, they contact each other and attract each other by the surface tension, and are equivalent to two or three.
- Large droplets 10B formed by coalescence of (or more) ink droplets. Once such a grain is formed, the ink droplet applied to the next or adjacent position is likely to be attracted to the dahrain.
- the grain that was first generated grows gradually as a nucleus and eventually produces large grains. In particular, in a uniform image area, such grains fixed on the recording medium are irregularly formed. It is scattered in a scattered state and is visually recognized as beading.
- the present invention has been made to solve the above-described problems, and its purpose is to perform data processing that can reduce deterioration in image quality due to beading caused by grains in the middle of divided recording.
- a method, a data processing apparatus, a mask manufacturing method, and a mask pattern are provided.
- the grain is not generated only by the surface tension between the inks.
- a liquid that reacts with each other such as a treatment liquid that aggregates or insolubles them
- the droplets that come into contact with each other are bonded by a stronger chemical reaction, which is a grain. May be formed.
- another object of the present invention is to solve the problems caused by such grains.
- the present invention for solving the above-described problems provides a mask pattern manufacturing method used for generating image data for recording a plurality of types of dots in each of a plurality of scans.
- a determination step for determining the arrangement of the print permission pixels in each of the plurality of mask patterns corresponding to the plurality of mask patterns, wherein the determination step includes a plurality of low frequency components determined by the arrangement of the print permission pixels in each of the plurality of mask patterns.
- the method includes the step of determining the arrangement of the print permitting pixels so that both are reduced in the mask pattern.
- a plurality of dots corresponding to the plurality of types of dots are used.
- a determination step for determining an arrangement of the print permission pixels in each of the mask patterns, and the determination step includes a step of changing a placement of the print permission pixels in each of the plurality of mask patterns, and in the change step, the recording step It is characterized in that the arrangement of the print permitting pixels in the plurality of mask patterns is changed so that the low frequency component depending on the arrangement of the allowable pixels is reduced.
- a plurality of dots corresponding to the plurality of types of dots are used.
- Including a step of changing the arrangement of the print-permitted pixels in the pattern, and the arrangement of the print-permitted pixels after the change has a lower frequency component than the arrangement of the print-permitted pixels before the change.
- the method of manufacturing a mask pattern used for generating image data for recording a plurality of types of dots constituting an image by each of a plurality of scans the plurality of types And determining the arrangement of each of the plurality of mask patterns by changing the arrangement of the recording allowable pixels in each of the plurality of mask patterns corresponding to the dots to the first arrangement state force and the second arrangement state.
- the arrangement pattern of the print permission pixels obtained by the logical product of the plurality of mask patterns in the second arrangement state is the print permission obtained by the logical product of the plurality of mask patterns in the first arrangement state.
- the low-frequency component is small.
- a mask pattern manufacturing method used to generate image data for recording a plurality of types of dots constituting an image by each of a plurality of scans is used.
- a determination step for determining an arrangement in each of the plurality of mask patterns, and an arrangement pattern of print permitting pixels obtained by a logical sum of the plurality of mask patterns in the second arrangement state is the same as that in the first arrangement state.
- the low-frequency component is small as compared with an arrangement pattern of print permission pixels obtained by logical sum of the plurality of mask patterns.
- the plurality of types of mask patterns an array of print-allowable pixels and a second type of dots in the plurality of first mask patterns corresponding to the plurality of scans for recording at least the first type of dots.
- the plurality of second mask patterns corresponding to the plurality of scans for recording a plurality of print-allowable pixel arrangements differ, and the plurality of first mask patterns
- a low frequency component of an array pattern of print permitting pixels obtained by a logical product of a predetermined first mask pattern and a predetermined second mask pattern of the plurality of second mask patterns is the predetermined first mask. It is characterized in that it is less than the low frequency component of the array pattern of print permitting pixels obtained by performing logical product by shifting the predetermined second mask pattern with respect to the pattern.
- the image data used in each of the plurality of scans for printing a plurality of nozzle groups that record a plurality of types of dots on a predetermined area of the recording medium is scanned a plurality of times.
- the arrangement of the print-allowable pixels in the plurality of second mask patterns corresponding to the plurality of scans for recording the array and the second type of dot is different, and 1 mask
- the low-frequency component of the array pattern of print permitting pixels obtained when the predetermined first mask pattern of the pattern and the predetermined second mask pattern of the plurality of second mask patterns are logically ANDed at the normal position is The predetermined first mask pattern and the predetermined second mask pattern are less than the low frequency component of the recording permissible pixel array pattern obtained by ANDing at a position different from the normal position.
- an image used for each of a plurality of scans for performing recording by scanning a plurality of nozzle groups that record a plurality of types of dots a plurality of times with respect to a predetermined area of the recording medium A data processing method for generating data, wherein a plurality of types of mask patterns corresponding to each of the plurality of types of dots are used to generate image data corresponding to the plurality of types of dots in each of the plurality of scans.
- the plurality of second mask patterns corresponding to the plurality of scans for recording the prime arrangement and the second type of dot are different from each other in the print allowable pixel arrangement, and
- the low frequency component in the array pattern of the print-allowed pixels obtained by the logical product of the predetermined first mask pattern of the first mask pattern and the predetermined second mask pattern of the plurality of second mask patterns is a high frequency.
- the print permission pixels of the predetermined first mask pattern and the predetermined second mask pattern are arranged in association with each other so as to have characteristics smaller than the component.
- an image used for each of a plurality of scans for recording a plurality of nozzle groups that record a plurality of types of dots by scanning a predetermined area of the recording medium a plurality of times.
- a data processing method for generating data wherein a plurality of types of mask patterns corresponding to each of the plurality of types of dots are used to generate image data corresponding to the plurality of types of dots in each of the plurality of scans.
- the plurality of second mask patterns corresponding to the plurality of scans for recording the prime arrangement and the second type of dot are different from each other in the print allowable pixel arrangement, and
- the first mask of An array pattern of print permitting pixels obtained by a logical product of a predetermined first mask pattern of the patterns and a predetermined second mask pattern of the plurality of second mask patterns is non-periodic and has a low low frequency component. It is characterized by that.
- image data to be used for each of the plurality of scans is generated to perform recording by scanning a plurality of nozzle groups that record a plurality of types of dots a predetermined area of the recording medium a plurality of times.
- a plurality of types of mask patterns corresponding to the plurality of types of dots, and the image data corresponding to the plurality of types of dots is divided into image data to be used for each of the plurality of scans.
- the plurality of second mask patterns corresponding to the plurality of scans for recording the types of dots have different print-allowable pixel arrangements, and the plurality of second mask patterns are different.
- the low frequency component of the array pattern of the print permitting pixels obtained by the logical sum of the predetermined first mask pattern of one mask pattern and the predetermined second mask pattern of the plurality of second mask patterns is
- the predetermined second mask pattern is less than the low-frequency component of the print-permitted pixel array pattern obtained by shifting and logically summing the predetermined second mask pattern with respect to the predetermined first mask pattern.
- image data to be used for each of the plurality of scans is generated to perform recording by scanning a plurality of nozzle groups that record a plurality of types of dots a predetermined area of the recording medium a plurality of times.
- a plurality of types of mask patterns corresponding to the plurality of types of dots, and the image data corresponding to the plurality of types of dots is divided into image data to be used for each of the plurality of scans.
- the low-frequency component of the pattern is the low-frequency component of the array pattern of print-allowable pixels obtained when the predetermined first mask pattern and the predetermined second mask pattern are logically summed at a position different from the normal position. Featuring less than.
- image data to be used for each of the plurality of scans is generated to perform recording by scanning a plurality of nozzle groups that record a plurality of types of dots a predetermined area of the recording medium a plurality of times.
- a plurality of types of mask patterns corresponding to the plurality of types of dots, and the image data corresponding to the plurality of types of dots is divided into image data to be used for each of the plurality of scans.
- the plurality of second mask patterns corresponding to the plurality of scans for recording the types of dots have different print-allowable pixel arrangements, and the plurality of second mask patterns are different.
- the low frequency component in the array pattern of print-allowed pixels obtained by the logical sum of the predetermined first mask pattern of one mask pattern and the predetermined second mask pattern of the plurality of second mask patterns is the high frequency component.
- the recording permission pixels of the predetermined first mask pattern and the predetermined second mask pattern are arranged in association with each other so as to have smaller characteristics.
- image data to be used for each of the plurality of scans is generated to perform recording by scanning a plurality of nozzle groups that record a plurality of types of dots a predetermined area of the recording medium a plurality of times.
- a plurality of types of mask patterns corresponding to the plurality of types of dots, and the image data corresponding to the plurality of types of dots is divided into image data to be used for each of the plurality of scans.
- An array pattern of print permitting pixels obtained by a logical sum of a predetermined first mask pattern of one mask pattern and a predetermined second mask pattern of the plurality of second mask patterns is a non-circular pattern. It is characterized by low and low frequency components!
- image data to be used for each of the plurality of scans is generated to perform recording by scanning a plurality of nozzle groups that record a plurality of types of dots a predetermined area of the recording medium a plurality of times.
- a plurality of types of mask patterns corresponding to the plurality of types of dots, and the image data corresponding to the plurality of types of dots is divided into image data to be used for each of the plurality of scans.
- the low frequency component of the array pattern of the print permitting pixels obtained by the logical product of the predetermined first mask pattern of one mask pattern and the predetermined second mask pattern of the plurality of second mask patterns is The predetermined first mask pattern and the predetermined first mask pattern are less than a low frequency component of an array pattern of print-allowed pixels obtained by logically shifting the predetermined second mask pattern with respect to the predetermined first mask pattern.
- the low-frequency component of the printable pixel array pattern obtained by the logical sum of the predetermined second mask pattern is logically summed by shifting the predetermined second mask pattern with respect to the predetermined first mask pattern. This is characterized in that it is less than the low frequency component of the array pattern of the print permitting pixels obtained in the above.
- image data to be used for each of the plurality of scans is generated to perform recording by scanning a plurality of nozzle groups that record a plurality of types of dots a predetermined area of the recording medium a plurality of times.
- a plurality of types of mask patterns corresponding to the plurality of types of dots, and the image data corresponding to the plurality of types of dots is divided into image data to be used for each of the plurality of scans.
- the plurality of second mask patterns corresponding to the plurality of scans for recording the types of dots have different print-allowable pixel arrangements, and the plurality of second mask patterns are different.
- the low-frequency component of the array pattern of print-permitted pixels obtained when the predetermined first mask pattern of the mask and the predetermined second mask pattern of the plurality of second mask patterns are logically ANDed at the normal position is The predetermined first mask pattern and the predetermined second mask pattern are obtained by logically ANDing the predetermined first mask pattern and the predetermined second mask pattern at positions different from the normal positions, and the predetermined predetermined number is less than a low frequency component of an array pattern of print permitting pixels.
- the low-frequency component of the array pattern of the print-allowable pixels obtained when the first mask pattern and the predetermined second mask pattern are logically summed at regular positions is the predetermined first mask pattern and the predetermined mask pattern. It is less than the low frequency component of the array pattern of the print permitting pixels obtained when the second mask pattern is logically summed at a position different from the normal position.
- image data to be used for each of the plurality of scans is generated to perform recording by scanning a plurality of nozzle groups that record a plurality of types of dots a predetermined area of the recording medium a plurality of times.
- a plurality of types of mask patterns corresponding to the plurality of types of dots, and the image data corresponding to the plurality of types of dots is divided into image data to be used for each of the plurality of scans.
- the plurality of second mask patterns corresponding to the plurality of scans for recording the types of dots have different print-allowable pixel arrangements, and the plurality of second mask patterns are different.
- a low frequency component is a high frequency component in an array pattern of print permitting pixels obtained by a logical product of a predetermined first mask pattern of one mask pattern and a predetermined second mask pattern of the plurality of second mask patterns.
- the low frequency component in the array pattern of the print-allowed pixels obtained by the logical sum of the predetermined first mask pattern and the predetermined second mask pattern is smaller than the high frequency component.
- the print permission pixels of the predetermined first mask pattern and the predetermined second mask pattern are arranged in association with each other.
- image data to be used for each of the plurality of scans is generated to perform recording by scanning a plurality of nozzle groups that record a plurality of types of dots a predetermined area of the recording medium a plurality of times. Each of the plurality of types of dots. Dividing the image data corresponding to the plurality of types of dots into image data to be used for each of the plurality of scans, using a plurality of types of mask patterns corresponding to An array of print permitting pixels in a plurality of first mask patterns corresponding to the plurality of scans for recording at least the first type of dots and the plurality of scans for recording the second type of dots.
- the arrangement of the print permitting pixels in the plurality of second mask patterns corresponding to is different, and the predetermined first mask pattern of the plurality of first mask patterns and the predetermined second of the plurality of second mask patterns are different.
- the predetermined first mask pattern in which the array pattern of the print permitting pixels obtained by the logical product of the mask patterns is aperiodic and has a small amount of low frequency components.
- the predetermined first mask pattern and the predetermined second mask pattern so that an array pattern of print permitting pixels obtained by a logical sum of the predetermined second mask pattern is aperiodic and low frequency components are reduced.
- Each recordable pixel is arranged in association with each other.
- image data to be used for each of the plurality of scans is generated to perform recording by scanning a plurality of nozzle groups that record a plurality of types of dots a predetermined area of the recording medium a plurality of times.
- a plurality of types of mask patterns corresponding to the plurality of types of dots, and the image data corresponding to the plurality of types of dots is divided into image data to be used for each of the plurality of scans.
- Each of the plurality of types of mask patterns has a plurality of mask patterns corresponding to the plurality of scans, and is used in a predetermined at least two of the plurality of scans.
- the low-frequency component of the array pattern of print-allowable pixels obtained by the logical product of the two mask patterns is the predetermined at least two mask patterns. Rashi wherein the less than the low frequency components of the arrangement pattern of print permitting pixels obtained by logical Riseki with.
- image data to be used for each of the plurality of scans is generated to perform recording by scanning a plurality of nozzle groups that record a plurality of types of dots a predetermined area of the recording medium a plurality of times.
- Dividing the image data into image data to be used for each of the plurality of scans, and each of the plurality of types of mask patterns includes a plurality of mask patterns corresponding to the plurality of scans.
- the low frequency component of the array pattern of the print permitting pixels obtained by the logical sum of at least two predetermined mask patterns used in the same predetermined scan among the scans is logically shifted by shifting the predetermined at least two mask patterns. It is characterized by being less than the low-frequency component of the array pattern of print permitting pixels obtained by summing.
- image data to be used for each of the plurality of scans is generated to perform recording by scanning a plurality of nozzle groups that record a plurality of types of dots a predetermined area of the recording medium a plurality of times.
- a plurality of types of mask patterns corresponding to the plurality of types of dots, and the image data corresponding to the plurality of types of dots is divided into image data to be used for each of the plurality of scans.
- Each of the plurality of types of mask patterns has a plurality of mask patterns corresponding to the plurality of scans, and is used in a predetermined at least two of the plurality of scans.
- the low-frequency component of the array pattern of print-allowable pixels obtained by the logical product of the two mask patterns is the predetermined at least two mask patterns. Therefore, the low frequency component of the array pattern of the print permitting pixels obtained by the logical sum of the predetermined at least two mask patterns is less than the low frequency component of the array pattern of the print permitting pixels obtained by the logical product. It is characterized in that it is less than the low frequency component of the array pattern of print permitting pixels obtained by shifting the logical sum of the at least two predetermined mask patterns.
- Each type of mask pattern has a plurality of mask patterns corresponding to the plurality of scans, and among the plurality of mask patterns constituting the plurality of types of mask patterns, a predetermined N ( (N is an integer of 2 or more)
- the low-frequency component of the array pattern of print permission pixels obtained by the logical product of the mask patterns is the print permission obtained by logically shifting the predetermined N mask patterns. It is characterized by being less than the low-frequency component of the pixel array pattern.
- image data to be used for each of the plurality of scans is generated to perform recording by scanning a plurality of nozzle groups that record a plurality of types of dots a predetermined area of the recording medium a plurality of times.
- a plurality of types of mask patterns corresponding to the plurality of types of dots, and the image data corresponding to the plurality of types of dots is divided into image data to be used for each of the plurality of scans.
- Each of the plurality of types of mask patterns has a plurality of mask patterns corresponding to the plurality of scans, and a predetermined pattern among the plurality of mask patterns constituting the plurality of types of mask patterns is provided.
- the low-frequency component of the print-permitted pixel array pattern obtained by the logical product of N mask patterns is the predetermined N masks. Shifting the Kupata down, characterized in that less than the low frequency components of the arrangement pattern of print permitting pixels obtained by ANDing with.
- image data to be used for each of the plurality of scans is generated to perform recording by scanning a plurality of nozzle groups that record a plurality of types of dots a predetermined area of the recording medium a plurality of times.
- a plurality of types of mask patterns corresponding to the plurality of types of dots, and the image data corresponding to the plurality of types of dots is divided into image data to be used for each of the plurality of scans.
- Each of the plurality of types of mask patterns has a plurality of mask patterns corresponding to the plurality of scans, and a predetermined pattern among the plurality of mask patterns constituting the plurality of types of mask patterns is provided.
- the low-frequency component of the print-permitted pixel array pattern obtained by the logical product of N mask patterns is the predetermined N masks.
- the lower limit of the print-permitted pixel array pattern obtained by the logical sum of the predetermined N mask patterns which is smaller than the low-frequency component of the print-permitted pixel array pattern obtained by performing logical AND with the different patterns.
- the frequency component is lower than the low-frequency component of the print-permitted pixel array pattern obtained by logically ANDing the predetermined N mask patterns. Featuring few.
- the plurality of mask patterns used to generate image data for recording a plurality of types of dots in each of a plurality of scans are obtained by superimposing two or more of them.
- the pattern of the print permitting pixel has a lower frequency component than the pattern of the print permitting pixel when the overlapping position is shifted with respect to the two or more mask patterns.
- FIG. 1 is a block diagram mainly showing a hardware and software configuration of a PC as an image processing apparatus according to an embodiment of the present invention.
- FIG. 2 is a block diagram for explaining the flow of image data conversion processing in the ink jet recording system of one embodiment of the present invention.
- FIG. 3 is a perspective view showing an ink jet recording apparatus applicable to the embodiment of the present invention.
- FIG. 4 is a diagram schematically showing a recording head, a mask pattern, and a recording medium in order to explain two-pass recording.
- FIG. 5 is a diagram schematically showing a recording head and a recording pattern in order to explain 2-pass multi-pass recording.
- FIG. 6A is a diagram schematically showing binary data of six planes related to C, M, and Y divided recording.
- Fig. 6 (b) is a diagram schematically showing binary data of 6 planes related to C, M, and Y divided recording.
- FIG. 7 is a diagram for explaining a mask manufacturing method according to the first embodiment of the present invention.
- FIG. 8 is a flowchart showing the procedure of the mask manufacturing method according to the first embodiment of the present invention.
- FIG. 9 is a diagram schematically showing a function of the basic repulsive potential E (r) according to the embodiment of the present invention.
- FIG. 10A is a diagram schematically illustrating the application of repulsive potential and the attenuation process of the total energy, which are relevant to the first embodiment of the present invention.
- FIG. 10B is a diagram for schematically explaining the application of repulsive potential and the attenuation process of the total energy, which are relevant to the first embodiment of the present invention.
- FIG. 10C is a diagram schematically illustrating the application of repulsive potential and the attenuation process of the total energy, which are relevant to the first embodiment of the present invention.
- FIG. 10D is a diagram schematically illustrating the application of repulsive potential and the attenuation process of the total energy, which are useful in the first embodiment of the present invention.
- FIG. 11 is a flow chart showing the procedure of another mask manufacturing method according to the first embodiment of the present invention.
- FIG. 12 is a diagram for explaining the logical product of mask patterns.
- FIG. 13 is a diagram for explaining a logical sum of mask patterns.
- FIG. 14 is a diagram showing the arrangement of the print permitting pixels of the mask pattern according to the first embodiment of the present invention.
- FIG. 15 is a diagram showing the arrangement of print permitting pixels of the mask pattern according to the first embodiment of the present invention.
- FIG. 16 is a view showing the arrangement of the print permitting pixels of the mask pattern according to the first embodiment of the present invention.
- FIG. 17 is a diagram showing an arrangement of print permitting pixels of a mask pattern according to a comparative example.
- FIG. 18 is a diagram showing an arrangement of print permitting pixels of a mask pattern according to another comparative example.
- FIG. 19 is a diagram showing an arrangement of recording-allowable pixels for logical sum of two mask patterns according to the first embodiment of the present invention.
- FIG. 20 is a diagram showing an arrangement of recording allowable pixels of a logical product of two mask patterns according to the first embodiment of the present invention.
- FIG. 21 is a diagram showing an arrangement of recording-allowable pixels for logical sum of three mask patterns according to the first embodiment of the present invention.
- FIG. 22 shows a logical product of three mask patterns according to the first embodiment of the present invention. It is a figure which shows arrangement
- FIG. 23 is a diagram showing an arrangement of print permitting pixels for logical sum of two mask patterns according to a comparative example.
- FIG. 24 is a diagram showing an arrangement of print permitting pixels of a logical product of two mask patterns according to a comparative example.
- FIG. 25 is a diagram showing the arrangement of the record-allowed pixels of the logical sum of two mask patterns according to another comparative example.
- FIG. 26 is a diagram showing an arrangement of print permitting pixels of a logical product of two mask patterns according to another comparative example.
- FIG. 27 is a diagram for explaining an “overlapping” pattern of mask patterns.
- FIG. 28 shows “superposition of two mask patterns according to the first embodiment of the present invention.
- FIG. 1 A first figure.
- FIG. 29 is a diagram showing an arrangement of print-allowable pixels for “superposition” of three mask patterns according to the first embodiment of the present invention.
- FIG. 30 is a diagram showing an arrangement of print-allowable pixels for “superposition” of two mask patterns according to a comparative example.
- FIG. 31 is a diagram showing an arrangement of print-allowed pixels for “superposition” of two mask patterns according to another comparative example.
- FIG. 32 is a diagram illustrating the frequency characteristics of one mask for each of the mask of the first embodiment of the present invention and the mask according to the conventional example.
- FIG. 33 is a diagram for explaining the frequency characteristics of the logical sum of two masks for each of the mask of the first embodiment of the present invention and the mask according to the conventional example.
- FIG. 34 is a diagram for explaining the frequency characteristics of the logical product of two masks for each of the mask of the first embodiment of the present invention and the mask according to the conventional example.
- FIG. 35 shows a mask according to the first embodiment of the present invention and a mask according to the conventional example.
- FIG. 5 is a diagram for explaining the frequency characteristics of “superposition” of two masks.
- FIG. 36 shows the mask of the first embodiment of the present invention and the mask according to the conventional example.
- FIG. 5 is a diagram for explaining the frequency characteristics of “superposition” of three masks.
- FIG. 37 is a diagram showing the arrangement of print permitting pixels of the logical sum of two mask patterns when the mask of the first embodiment of the present invention is shifted.
- FIG. 38 is a diagram showing an arrangement of print permitting pixels of the logical product of two mask patterns when the mask is shifted according to the first embodiment of the present invention.
- FIG. 39 is a diagram showing an arrangement of print permitting pixels for “superposition” of two mask patterns when the mask of the first embodiment of the present invention is shifted.
- FIG. 40 is a diagram showing a power spectrum of a logical sum of two mask patterns of the mask of the first embodiment of the present invention and a mask shifted from the mask, respectively. It is a figure which shows the power spectrum of the logical sum of a turn.
- FIG. 42 is a diagram showing a power spectrum of a logical sum of two mask patterns of each of a mask of another comparative example and a mask shifted from that.
- FIG. 43 is a diagram showing a power spectrum of a logical product of two mask patterns of the mask of the first embodiment of the present invention and the mask shifted from it. It is a figure which shows the power spectrum of the logical product of a turn.
- FIG. 45 is a diagram showing a power spectrum of a logical product of two mask patterns of a mask of another comparative example and a mask shifted from that.
- FIG. 46 is a diagram showing a [superposition] power spectrum of the mask of the first embodiment of the present invention and two mask patterns each shifted from the mask. It is a figure which shows the power spectrum of [superposition] of a turn.
- FIG. 48 is a diagram showing a power spectrum of [superposition] of two mask patterns of a mask of another comparative example and a mask shifted from that.
- FIG. 49 is a diagram showing a [superposition] power spectrum of the mask of the first embodiment of the present invention and three mask patterns each shifted from the mask.
- FIG. 50 is a diagram showing a difference in low-frequency components of the logical sum, logical product, and [superposition] of the mask and the shifted mask of the first embodiment of the present invention! .
- FIG. 51 is a diagram showing a difference between a logical sum, a logical product, and a low frequency component of [superposition] of a mask of a comparative example and a mask shifted from that.
- FIG. 52 is a diagram showing a difference between a logical sum, a logical product, and a low frequency component of [superposition] of another comparative example mask and a mask shifted from that.
- FIG. 53 is a view for explaining the mask manufacturing method according to the second embodiment of the present invention.
- FIG. 54 is a view for explaining the mask manufacturing method according to the second embodiment of the present invention.
- FIG. 55 is a diagram showing an arrangement of print permitting pixels of a mask pattern according to the second embodiment of the present invention.
- FIG. 56 is a diagram showing an arrangement of print permitting pixels of a mask pattern according to the second embodiment of the present invention.
- FIG. 57 is a diagram showing the arrangement of the print permitting pixels of the mask pattern according to the second embodiment of the present invention.
- FIG. 58 is a diagram showing the arrangement of print permitting pixels for “superposition” of three mask patterns according to the second embodiment of the present invention.
- FIG. 59 is a diagram showing an arrangement of print permitting pixels for “superposition” of six mask patterns according to the first embodiment of the present invention.
- FIG. 60 is a diagram showing an arrangement of print-allowed pixels for “overlay” of nine mask patterns according to the second embodiment of the present invention.
- FIG. 61 is a diagram showing an arrangement of print permitting pixels for “superposition” of three mask patterns when the mask of the second embodiment of the present invention is shifted.
- FIG. 62 is a diagram showing an arrangement of print-allowed pixels for “overlay” of six mask patterns when the mask of the second embodiment of the present invention is shifted.
- FIG. 63 is a diagram showing an arrangement of print permitting pixels for “overlay” of nine mask patterns when the mask of the second embodiment of the present invention is shifted.
- FIG. 64 is a diagram showing a difference in low frequency components of [superposition] of the mask of the second embodiment of the present invention and the mask shifted from it.
- FIG. 65A is a view for explaining a mask according to the third embodiment of the present invention.
- FIG. 65B is a view for explaining a mask according to the third embodiment of the present invention.
- FIG. 66 is a flowchart showing the procedure of the mask manufacturing method according to the third embodiment of the present invention.
- FIG. 67 is a flowchart showing the procedure of another mask manufacturing method according to the third embodiment of the present invention.
- FIG. 68 is a diagram showing an arrangement of print permitting pixels of a mask pattern according to the third embodiment of the present invention.
- FIG. 69 is a diagram showing an arrangement of print permitting pixels of a mask pattern according to the third embodiment of the present invention.
- FIG. 70 is a diagram showing the arrangement of the print permitting pixels of the mask pattern according to the third embodiment of the present invention.
- FIG. 71 is a diagram showing an arrangement of recording-allowable pixels for logical sum of two mask patterns according to the third embodiment of the present invention.
- FIG. 72 is a diagram showing an arrangement of recording permission pixels of a logical product of two mask patterns according to the third embodiment of the present invention.
- FIG. 73 is a view showing the arrangement of print permitting pixels for “superposition” of two mask patterns according to the third embodiment of the present invention.
- FIG. 74 is a diagram showing an arrangement of print permitting pixels for “superposition” of three mask patterns according to the third embodiment of the present invention.
- FIG. 75 is a diagram showing the disposition of print permitting pixels of the logical sum of two mask patterns when the mask of the third embodiment of the present invention is shifted.
- FIG. 76 is a diagram showing an arrangement of print permitting pixels of the logical product of two mask patterns when the mask of the third embodiment of the present invention is shifted.
- FIG. 77 is a diagram showing an arrangement of print permitting pixels for “superposition” of two mask patterns when the mask of the third embodiment of the present invention is shifted.
- FIG. 78 is a diagram showing an arrangement of print permitting pixels for “superposition” of three mask patterns when the mask of the third embodiment of the present invention is shifted.
- FIG. 79 is a view showing a power spectrum of a logical sum of two mask patterns of a mask of the third embodiment of the present invention and a mask shifted from the mask, respectively.
- FIG. 80 is a diagram showing a power spectrum of a logical product of two mask patterns of a mask of the third embodiment of the present invention and a mask shifted from the mask, respectively.
- FIG. 81 is a diagram showing a power spectrum of [superposition] of two mask patterns for each of the mask of the third embodiment of the present invention and the mask shifted from it.
- FIG. 82 is a diagram showing a [superposition] power spectrum of the mask of the third embodiment of the present invention and three mask patterns each shifted from the mask.
- FIG. 83 is a diagram showing a difference between a logical sum, a logical product, and a low-frequency component of [superposition] of the mask of the third embodiment of the present invention and the mask shifted from it. .
- FIG. 84 is a view for explaining a mask used for two-pass multi-pass printing according to the fourth embodiment of the present invention.
- FIG. 85 is a view for explaining a mask used for 2-pass multi-pass printing according to the fifth embodiment of the present invention.
- FIG. 86 is a diagram for explaining the problems of the prior art.
- the embodiment of the present invention relates to a mask pattern for generating binary dot print data used in each scan of multipass printing, and its mask pattern.
- dot recording data in this specification means data indicating dot recording.
- FIG. 1 is a block diagram mainly showing hardware and software configurations of a personal computer (hereinafter also simply referred to as a PC) functioning as a host device according to an embodiment of the present invention.
- This host device generates image data to be recorded by the printer 104.
- a PC 100 that is a host computer operates application software 101, a printer driver 103, and a monitor driver 105 by an operating system (OS) 102.
- the application software 101 performs processing related to a word processor, spreadsheet, internet browser, and the like.
- Monitor driver 105 is a monitor Processing such as creating image data to be displayed on 106 is executed.
- the printer driver 103 performs drawing processing on various drawing command groups (image drawing commands, text drawing commands, graphics drawing commands, etc.) issued from the application software 101 to the OS 102, and finally uses the binary values used by the printer 104. Generate image data. Specifically, binary image data for each of a plurality of ink colors used in the printer 104 is generated by executing image processing described later in FIG.
- the host computer 100 includes a CPU 108, a hard disk (HD) 107, a RAM 109, a ROM 110, and the like as various hardware for operating the above software. That is, the CPU 108 executes the process according to the software program stored in the hard disk 107 or the ROM 110, and the RAM 109 is used as a work area when the process is executed.
- the CPU 108 executes the process according to the software program stored in the hard disk 107 or the ROM 110
- the RAM 109 is used as a work area when the process is executed.
- the printer 104 of the present embodiment is a so-called serial type printer that performs recording by ejecting ink while a recording head that ejects ink is moved against a recording medium.
- the recording head is prepared corresponding to each ink of C, M, Y, and ⁇ , and when these are mounted on the carriage, the recording medium such as recording paper can be scanned.
- Each recording head has an ejection port array density of 1200 dpi, and ejects 3.0 picoliter of ink droplets from each ejection port.
- Each recording head has 512 outlets.
- the printer 104 is a recording device that can execute multi-pass recording.
- a mask described in each embodiment described later is stored in a predetermined memory, and binary divided image data is obtained by using a mask determined for each scanning and ink color at the time of recording. Generate the process.
- the mask manufacturing process described in each embodiment described later is executed.
- the manufactured mask data is stored in a predetermined memory of the printer 104.
- FIG. 2 is a block diagram for explaining main data processing steps in the PC 100 and the printer 104 when recording is performed by the printer 104 in the configuration shown in FIG.
- the ink jet printer 104 performs recording with inks of four colors of cyan, magenta, yellow, and black, and is provided with a recording head J0010 for ejecting these four colors of ink.
- a user can create image data to be recorded by the printer 104 via the application 101 of the host PC 100.
- the image data created by the application 101 is passed to the printer driver 103.
- the printer driver 103 executes the pre-stage process 3 ⁇ 4 [0002, the post-stage process 3 ⁇ 4 [0003, y supplement 1 ⁇ 0004, the binarization process 3 ⁇ 4 [0005], and the print data creation 0006 as the processes.
- color gamut conversion is performed to convert the color gamut of the display device that displays the screen by the application into the color gamut of the printer 104.
- image data R, G, and B each of which is represented by 8 bits in R, G, and B, are converted to 8-bit data scale, G, and B within the printer's color gamut using a 3D LUT.
- the post-processing [0003] the color that reproduces the converted color gamut is separated into ink colors.
- ⁇ complement 1 ⁇ 0004 ⁇ correction is performed for each CMYK data obtained by color separation.
- conversion is performed so that each 8-bit data CMYK obtained by color separation is linearly associated with the gradation characteristics of the printer.
- quantization processing is performed to convert the 8-bit data C, M, Y, and ⁇ ⁇ that have been subjected to ⁇ correction into 1-bit data C, ⁇ , ⁇ , and ⁇ , respectively.
- print data is created by attaching print control data to binary image data containing binary 1-bit data C, M, K, and ⁇ .
- the binary image data includes dot recording data indicating dot recording and dot non-recording data indicating non-recording of dots.
- the print control data includes “recording medium information”, “recording quality information”, and “other control information” such as a paper feed method.
- the print data generated as described above is supplied to the printer 4.
- the printer 104 performs a mask data conversion process [0008] on the binary image data included in the input print data.
- the mask data conversion process [0008] mask masks which are stored in advance in a predetermined memory of the printer and described in each embodiment described later. AND is applied to the input binary image data.
- binary divided image data used in each scan in multi-pass printing is generated, and the timing at which ink is actually ejected is determined.
- the binary divided image data includes dot recording data and dot non-recording data.
- FIG. 3 is a perspective view showing the ink jet printer 104.
- Carriage M4000 is equipped with a print head and ink tank H1900 that supplies cyan (C), magenta (M), yellow (Y), and black (K) ink to the X head (main scanning direction). ), And each nozzle of the recording head ejects ink at a predetermined timing based on the binary divided image data.
- the recording medium is conveyed by a predetermined amount in the Y direction (sub scanning direction) in the figure.
- a mask pattern that is used or manufactured in the above-described recording system is distinguished by the number of times of scanning (hereinafter also referred to as “pass”) to complete an image of multi-pass recording and the ratio of recording allowable pixels.
- the present embodiment relates to two-pass multi-pass printing that completes an image in two scans for each ink of cyan (C), magenta (M), yellow (Y), and black (K). Then, for each of the ink colors used for the two-pass printing, a mask (hereinafter referred to as “one-plane” mask) used for each of a plurality of (two in the present embodiment) scanning is well dispersed. The combination of any number of planes in these masks is also well distributed.
- FIG. 4 is a diagram schematically showing a recording head, a mask pattern, and a recording medium in order to explain 2-pass recording.
- a recording head for simplification of illustration and description, a case where two-pass printing is performed with three colors of cyan, magenta, and yellow will be described. The same applies to the masks described below.
- the nozzle groups of cyan, magenta, and yellow are the first group and the second group 2 Divided into groups, each group containing 256 nozzles.
- Each group is associated with the mask pattern (Cl, C2, Ml, M2, Yl, Y2) of this embodiment, and the size of each mask pattern in the sub-scanning direction (conveyance direction) is the size of each group. It is 256 pixels, the same as the number of slurs. Also, the size in the scanning direction is 256 pixels.
- the two mask patterns (C1 and C2, or Ml and M2, or Y1 and Y2) corresponding to the same color ink nozzle group are complementary to each other. When these are superimposed, they correspond to 256 X 256 pixels. The recording of the completed area is completed.
- Each color nozzle group ejects ink onto a recording medium while scanning in a direction substantially orthogonal to the nozzle arrangement direction (“head scanning direction” indicated by an arrow in the figure).
- C, M, and Y inks are ejected to each region.
- the recording medium is conveyed by the width of one loop (here, 256 pixels) in the direction perpendicular to the scanning direction (the “recording medium conveyance direction” indicated by the arrow in the figure). Is done.
- an image having a size corresponding to the width of each group of the recording medium is completed by scanning twice.
- the first scan uses the first group of the C nozzle group, the first group of the M nozzle group, and the first group of the Y nozzle group for the area A on the recording medium in the first scan. Recording is performed in the order of C MY. In this first scan, the mask pattern Cl, the mask pattern Ml, and the mask pattern Y1 are used for the region A.
- the second group of the C nozzle group, the second group of the M nozzle group, and the second group of the Y nozzle group are applied to the area A where the printing in the first scan is completed.
- the remaining recording is performed in the order of YMC, and for the unrecorded area B, the first group of the C nozzle group, the first group of the M nozzle group, and the first group of the Y nozzle group are used.
- Recording is performed in the order of YM C. Therefore, in the second scan, mask pattern C2, mask pattern M2, and mask pattern Y2 are used for area A, and mask pattern Cl, mask pattern Ml, and mask pattern Y1 are used for area B. Furthermore, by continuing such an operation, recording is performed in each area in the order of C1M1Y1Y2M2C2 or Y1M1C1C2M2Y2.
- FIG. 5 is a schematic diagram conceptually illustrating the mask used for the two-pass printing described in FIG. 4 and its complementary relationship.
- P0001 is one color among C, M, and Y shown in FIG.
- the recording head is shown as having eight nozzles.
- the nozzles are divided into the first and second groups as described above, and each nozzle group includes four nozzles.
- P0002A and P0002B indicate mask patterns corresponding to the nozzle rows of the first and second groups, respectively. That is, the mask pattern P0002A (lower pattern in the figure) used in the first scan and the mask pattern P0002B (upper pattern in the figure) used in the second scan. Each of these becomes a mask of one plane.
- each mask pattern printable pixels are shown in black, and non-printable pixels are shown in white.
- the mask pattern P0002A for the first scan and the mask pattern P0002B for the second scan are complementary to each other. Therefore, when these are overlaid, the print permitting pixels fill the entire 4 ⁇ 4 area.
- the pattern shown in the figure is shown as a pattern different from the mask pattern of the present embodiment shown below for easy explanation. In this figure, the force that the print permitting pixels are arranged in a staggered pattern and an inverted staggered pattern is not included in the scope of the present invention.
- “recording allowable pixel” and “non-recording allowable pixel” are defined.
- the “recording allowable pixel” is a pixel that allows dot recording (ink ejection). If the binary image data corresponding to this recording pixel is data indicating ejection, dot recording is performed, and if it is data indicating non-ejection, dot recording is not performed.
- “non-recording-permitted pixels” are pixels that do not permit recording regardless of binary image data. Accordingly, even if the binary image data corresponding to the non-recording allowable pixels is data indicating ink ejection, recording is not performed.
- P0003 and P0004 show images completed by two-pass recording in dot arrangements constituting the images. Note that this image is a so-called solid image in which dots are formed on all pixels for the sake of easy explanation. Therefore, the arrangement of the print allowable pixels of the mask P0002 used for generating the dot print data is reflected as it is. The dot arrangement is shown. In the first scan, the first group of dot recording data is generated using the mask pattern P0002A. Then, the recording medium is conveyed by the width of the nozzle group in the direction of the arrow in the figure.
- the first group of dots for the area shifted by the carry amount The recording data is similarly generated using the mask pattern P0002A, and the second group dot recording data for the area recorded in the first group is generated using the mask pattern POOO 2A.
- FIGS. 6A-B show the two-pass printing described in FIGS. 4 and 5 using C, M, and Y inks (as described above, black K is omitted for simplicity). It is a figure explaining the case where it performs.
- Figure 6 [As shown here, use masks Cl, Ml, Yl, C2, M2, and Y2! ⁇ , C in two scans (forward scan and reverse scan in the examples shown in Figs. 6A to 6B) Eject M and Y inks and record a color image.
- Fig. 6 (b) shows the image of the area recorded in the order of the forward runner (scanning to the right in Fig. 4) and the reverse run trip (scanning to the left in Fig. 4). It is shown.
- the forward scan which is the first scan
- a cyan image is recorded based on the dot recording data of the divided image data of the cyan generated using the first-pass cyan mask (mask C1).
- the magenta image is superimposed on the cyan image recorded earlier, and The yellow image is recorded in sequence with the cyan and magenta images recorded before that.
- the second scan which is the second scan after the recording medium has been transported by a predetermined amount, similarly, based on the yellow, magenta, and cyan dot print data generated using the masks Y2, M2, and C2, respectively, Record over the previously recorded image.
- FIG. 6B shows that the image of the area recorded in the order of reverse run (scanning in the left direction in FIG. 4) and forward run (scanning in the right direction in FIG. 4) is completed. It shows how it works.
- the backward scan which is the first run
- a yellow image is recorded based on the dot recording data of the yellow divided image data generated using the first pass yellow mask (mask Y1).
- the magenta image is superimposed on the yellow image recorded earlier, and further the cyan image Are recorded in sequence on top of the yellow and magenta images recorded earlier.
- each of the images generated sequentially using the masks C2, M2, and Y2 is used. Based on the cyan, magenta, and yellow dot recording data, the image is recorded on top of it.
- the arrangement of the print permitting pixels when the masks of the respective planes that avoid the occurrence of grains in the intermediate image are overlapped has a characteristic that the low frequency component is small. Since there are few low-frequency components, the ink dot bias in the intermediate image in each stage can be kept small. As an important characteristic, non-periodic pattern characteristics are provided to prevent interference with image data and other noise. That is, the arrangement of the print permitting pixels when the plane mask is overlaid is non-periodic and has a low frequency component and has characteristics, so that the dispersibility is excellent. As a result, the proximity or adjacency of dots in the intermediate image at each stage leading to the completion of the image and the overlap of dots are eliminated as much as possible. In addition, even if overlapping and adjacent dots cannot be eliminated, such overlapping points are also highly dispersible.
- low frequency component refers to a component on the lower frequency side than half of the spatial frequency region where the frequency component (power spectrum) exists.
- the mask manufacturing method according to the embodiment of the present invention can be broadly divided into a method of simultaneously generating a mask for a plurality of passes (simultaneous generation) and a method of sequentially generating a mask for each pass (for each pass). Production) can be done in one of two ways.
- the former simultaneous generation method (number of passes to complete the image (number of scans) 1) generates masks for one pass at a time, and the remaining one pass masks are masks for which the printable pixels are generated simultaneously. It is generated so as to be exclusive to the arrangement of the print permitting pixels.
- the latter generation method for each pass is a method in which a mask is sequentially generated for each of a plurality of passes (scans) for completing an image, and the mask for the last pass has a printable pixel as in the former method. It is generated so as to be exclusive to the print permitting pixel arrangement of the mask generated so far. In the case of this embodiment, since it is a mask used for two-pass printing, simultaneous generation and generation for each pass are the same.
- placement movement method A method of increasing the dispersibility as a whole (hereinafter referred to as “placement movement method”) and a method of disposing the printable pixels one by one while increasing the dispersibility of the entire generated mask (hereinafter referred to as “sequential placement method”). )).
- FIG. 7 is a diagram conceptually showing a method for manufacturing a mask used in the two-pass printing of the present embodiment.
- each plane mask Cl used in the first pass each plane mask Cl used in the first pass
- step 2 the masks C2, M2, and Y2 for the planes used in the second pass are generated so as to have a complementary relationship with the masks Cl, Ml, and Y1 in the first pass.
- the mask for the second pass is generated so that the layout of the print permitting pixels is in an exclusive relationship with the layout of the print permitting pixels of the first pass mask.
- the arrangement of the print permitting pixels in the first-pass masks Cl, Ml, and Y1 is performed as follows. First, the arrangement movement method will be explained, and then the sequential arrangement method will be explained. Of course, any of these arrangement methods may be used.
- FIG. 8 is a flowchart showing an arrangement determination process by the arrangement movement method of the print permitting pixels of the mask used in the two-pass printing of the present embodiment.
- step S801 C, M, and Y 50% density images corresponding to the sizes of the first-pass masks Cl, Ml, and Y1 are acquired.
- step S802 a binary value is applied to each image using a binary value method such as error diffusion.
- a binary value method such as error diffusion
- the initial arrangement of the printable pixels using this binary key method can be obtained to some extent in the initial state with good dispersibility according to the binary key method used. This is because the calculation time or convergence time until the final placement determination can be shortened.
- the method of obtaining the initial arrangement in applying the present invention is not essential.
- the initial arrangement is a random arrangement of the recording allowable pixels whose 1-bit data is “1”. May be.
- step S803 the repulsive potential is calculated for all the print permitting pixels of the respective planes of the masks Cl, Ml, and Y1 obtained as described above. Specifically, (i) A repulsive force corresponding to the distance is applied between the print permitting pixels in the same plane.
- FIG. 9 is a diagram schematically showing a function of the basic repulsive potential E (r) according to the present embodiment.
- the repulsive force function defined in the present embodiment represents the range covered by the repulsive force r
- Up to 16 (pixels; mask pixels on which printable pixels are arranged).
- the potential due to the presence of a certain print-permitted pixel is the repulsive potential for a print-permitted pixel in the same plane, a print-permitted pixel in a different plane, and even a print-permitted pixel in a different plane that is within a distance r Is added.
- the size of the mask pattern is finite (in this embodiment, it is 256 x 256 pixels), in the potential calculation, the same pattern of 256 x 256 pixels seems to repeat the force. Periodic boundary conditions are used. Therefore, the left edge of the mask pattern is adjacent to the right edge, and the bottom is adjacent to the top.
- the dispersibility of recording-permitted pixels is affected by the values of a, ⁇ , and ⁇ .
- 8, and ⁇ can be obtained, for example, by performing an experiment in practice and optimizing with reference to a recorded image recorded using a mask.
- the coefficient s ( ⁇ ) is a coefficient that is further integrated in addition to ⁇ in order to disperse the overlapping recording allowable pixels.
- This coefficient s (n) is a value corresponding to the number of overlaps that more disperse these recordable pixels as the overlap increases. According to the experiment of the present inventor, by using s (n) obtained by the following two equations, the difference can be obtained!
- n is the number of overlaps
- the sum of the number of combinations is s (n). More specifically, the recording allowable pixel that overlaps the target recording allowable pixel for calculating the repulsive force (at the same position in the same plane or a different plane) is checked, and the recording allowable pixel located at the distance r from the target recording allowable pixel. Check out. In this case, the number of common overlaps between the recordable pixel of interest and the recordable pixel of another plane that overlaps at the same position as that pixel, and the recordable pixel that overlaps the same pixel at each pixel at the distance r. Let n be. Then, consider the repulsive force caused by the overlapping print permitting pixels between these two pixels.
- n 3 when considering an example in which there is a print permitting pixel in common in each of the first plane, the second plane, and the third plane between certain two pixels.
- a repulsive force caused by the overlap of the three recordable pixels is applied between these pixels.
- the repulsive force caused by the overlap of the three recordable pixels it is considered that the overlap of the two recordable pixels and the repulsive force of one recordable pixel act in a multiple manner together with the overlap of the three recordable pixels.
- the third plane is not considered, it can be considered that two recordable pixels overlap the first plane and the second plane, and if the second plane is not considered, the first plane and the third plane are overlapped.
- step S803 the total energy obtained by summing up the repulsive potentials of all the print-allowable pixels is obtained. Then, this total energy is attenuated.
- the print permitting pixels are sequentially transferred to the pixels having the lowest repulsive potential among the pixels within the distance r force in order for all the print permitting pixels.
- the total energy which is the total value of the repulsive potentials of all the print-permitted pixels, is reduced. In other words, this total energy gradually
- the next decreasing process is a process in which the disposition of the print permitting pixels sequentially increases the dispersibility, that is, a process in which the low frequency components of the record permitting pixel layout are sequentially decreased.
- step S805 the rate of reduction of the total energy in step S804 is calculated, and if it is determined that it is equal to or less than a predetermined value, the energy attenuation process is terminated.
- the predetermined value can be obtained as a reduction rate at which an image in which low frequency components are appropriately suppressed can be recorded based on the result of actual printing.
- each plane in which the rate of decrease in total energy is equal to or less than a predetermined value as described above is set as a first-pass mask Cl, Ml, Y1.
- masks C2, M2, and Y2 for the second pass are set with the exclusive positions of the print permitting pixels arranged in these masks as the print permitting pixel arrangement.
- step S805 it is determined in step S805 whether or not the total energy decrease rate is equal to or less than a predetermined value. When the decrease rate is equal to or less than the predetermined value, the process proceeds to step S806.
- the present embodiment is not limited to this example. For example, in step S805, it may be determined whether or not the total energy is less than or equal to a predetermined value, and if the total energy is less than or equal to the predetermined value, the process proceeds to step S806.
- FIGS. 10A to 10D are diagrams schematically illustrating the above-described repulsive potential calculation and total energy attenuation processing.
- the three planes Cl, Ml, and Y1 according to the present embodiment are shown in a perspective view, and in particular, the movement of a print permitting pixel is shown in a plan view.
- the smallest square represents the mask pixel, and the overlapping pixels correspond to the same pixel position between the planes.
- FIG. 10A is a diagram for explaining that potential is applied (increased) by repulsive force between the print permitting pixels when the print permitting pixels exist in the same plane.
- FIG. 10C shows the above-mentioned two cases.
- FIG. 4 is a diagram for explaining a repulsive potential that can be recognized in relation to recording permission pixels when there is an overlap of recording permission pixels.
- the total repulsive potential due to the presence of the target recording allowable pixel Do in the recording allowable pixel arrangement shown in FIG. 10C is 1 X J8E (0) + 1X aE (r) + 2X j8E (r) + ys (2) XE (r)
- FIG. 10D is a diagram for explaining that the total repulsive potential of the print permitting pixel is changed by moving the print permitting pixel Do in the print permitting pixel arrangement shown in FIG. 10C.
- the recording allowable pixel Do (recording allowable pixel of plane C1) moves to the adjacent pixel of the same plane
- the total repulsive potential due to the presence of the recording allowable pixel Do is the distance force r2.
- the total of the repulsive potential is obtained by calculating the total energy of the recording allowable pixels of the three pixels when the two pixels or the recording allowable pixels are moved. Is for the purpose of simplifying the explanation, and is actually obtained as an integral of the repulsive potential based on the relationship with the recordable pixels including the recordable pixels of other pixels that may exist other than these recordable pixels. Of course. [0086] As shown in FIGS. 10A to 10C, among the recording allowable pixels for which the total repulsive potential is calculated, for example, when the recording allowable pixel Do has the largest total repulsive potential, as illustrated in FIG. 10D.
- the change of the repulsive potential before and after the movement is obtained, and the recording allowable pixel Do is moved to the pixel having the lowest total repulsive potential before and after the movement.
- the total energy of all three planes can be reduced.
- the recording allowed pixel distribution power is low and low frequency components are distributed well.
- the masks C2, M2, and Y2 that are complementary to these masks are also recorded respectively. Are well dispersed.
- the distribution of the recordable pixels in the overlap of any number (2, 3, 4 or 5) of these 6 planes is also well distributed with few low frequency components.
- the first pass mask Cl, the first pass mask Ml, the first pass mask Yl, the second pass mask ⁇ 2, the second pass Mask ⁇ 2 and mask C 2 in the second pass In this order, the mask patterns are used so as to overlap each other and recording is performed.
- the first pass mask Yl, the first pass mask Ml, the first pass mask Cl, the second pass mask C2, and the second pass mask Recording is performed using mask M2 and mask Y2 of the second pass in order of the mask patterns.
- the intermediate images are “Y pass 1 + M pass 1”, “Y pass 1 + M pass 1 + M pass 1”, “Y pass 1 + M + 1 pass 1” "C + 2nd pass of the first pass", "Y of the first pass + M of the first pass + C of the first pass + C of the second pass + M of the second pass", "Y + 1 of the first pass M + 1st pass C + 2nd pass C + 2nd pass M + 2nd pass Y +
- Each ink dot distribution has low frequency components and excellent dispersion. It becomes.
- the dots recorded by the dot recording data of each nose generated using such a mask are also well dispersed.
- the arrangement pattern of the print permitting pixels of the mask has few low frequency components, so that the arrangement pattern of the dots recorded using the mask is the dot pattern in the original image before the mask process.
- the bias in the arrangement pattern does not appear.
- each dot pattern recorded using the mask of each pass also has low frequency components and good dispersibility, similar to the mask pattern.
- the printer 104 shortens the recording time difference between the planes, that is, the ejection time difference. It becomes possible.
- the carriage speed or ejection frequency can be increased, or the number of passes in multi-nosed printing is set to 4 passes in consideration of sufficient ink penetration, for example, and printing with 2 passes less is executed. It is also possible.
- the above-described arrangement movement method is a force relating to a case where it is applied to a 3-plane mask used in the first pass among 2-pass masks.
- This method is not limited to this mode, and is applied to all planes. It may be applied to to determine the layout of recordable pixels.
- the placement movement method may be applied to a six-plane mask for two passes of C, M, and Y.
- the range in which the recordable pixels are moved is not limited to the neighboring pixels, and the movement of replacing the arranged pixels in relation to the recordable pixels of other planes is allowed.
- a print permitting pixel of a certain plane is moved to a pixel where a record permitting pixel of the same plane is not arranged, and a record permitting pixel arranged in a pixel of another plane corresponding to the moved pixel is used. Pixels that same pre The screen is moved to the pixel corresponding to the pixel with the former recordable pixel.
- the printable pixels of the mask plane are still arranged.
- FIG. 11 is a flowchart showing the arrangement determination process of the print permitting pixels by the sequential arrangement method of the present embodiment.
- the process shown in FIG. 11 is to arrange 50% print permitting pixels on each plate by sequentially arranging print permitting pixels one by one on three planes and repeating that.
- step S1101 when placing a print permitting pixel, the repulsive potential generated between the print permitting pixel and the print permitting pixels already arranged in the respective planes of the masks Cl, Ml, and Y1 is calculated. calculate.
- the recording allowable pixels Do not include the pixels shown in FIG.
- the repulsive potential is calculated based on the relationship with the recording allowable pixels of the same plane C1 and different planes M1 and Y1 that are already arranged.
- the repulsive potential is the same regardless of where the print permitting pixels are located!
- step S1102 a mask pixel having the lowest potential energy is determined from the repulsive potentials calculated when placed on each mask pixel.
- step S1103 it is determined whether there are a plurality of mask pixels having the minimum energy. If there are a plurality of pixels, in step S1107, one mask pixel is determined from the plurality of pixels using a random number. In the present embodiment, a pixel having the minimum energy is determined under the condition that a print permitting pixel is already arranged in the same plane and is not arranged in an overlapping manner.
- the energy may be minimized due to the relationship with the recordable pixels of other planes. This is to prevent overlap because only one printable pixel is allowed for the mask pixel.
- step S1104 a print permitting pixel is arranged in the mask pixel having the determined minimum potential energy. That is, the mask data of the pixel is set to “1”.
- step S1105 it is determined whether or not one print-permitted pixel image is arranged for each of the C, M, and Y planes. If not, the process from step S1101 is repeated.
- step S1106 If the print permitting pixels are arranged one by one in this order, planes Cl, Ml, and Y1, whether or not the print permitting pixels are arranged up to 50% with respect to all the mask pixels in each of the three planes in step S1106. Judge whether or not. If the recordable pixels are not arranged up to 50% in each plane, the processing from step S1101 is repeated. Then, when 50% of print permitting pixels are arranged in all three planes, this process ends.
- the masks Cl, Ml, and Y1 for the first pass are set as described above, the masks C2, M2, and Y2 that are complementary to these are subsequently set.
- the sequential placement method described above a mask having the same characteristics as the placement movement method described above can be obtained.
- the three-plane masks Cl, Ml, and Yl obtained by the sequential arrangement method have the print permitting pixels well dispersed in the overlap.
- the masks C2, M2, and Y2 that are complementary to each other also have well-distributed printable pixels.
- the distribution of the print permitting pixels in the overlap of any number (2, 3, 4 or 5) of these 6 planes is also well distributed with few low frequency components.
- Another feature of the mask manufacturing method described above is that a periodic pattern that regularly repeats the arrangement of the print-permitted pixels is not generated. For example, a pattern with periodicity that repeats a staggered pattern or a Bayer pattern is not generated. Even if it is generated, it can be converged to avoid periodic turns by resetting the repulsive potential parameter. In this way, the machine of this embodiment
- the mask generated by the mask manufacturing method has a non-periodic pattern.
- the "logical product" pattern is literally a pattern obtained by performing a logical product operation on the same pixel position between a plurality of planes, as shown in FIG. Specifically, when there are both print-permitted pixels ("1") at corresponding pixel positions in a plurality of (two in the example shown in the figure) planes, the pattern from which these positions are extracted is a logical product pattern. . This logical product pattern shows the distribution of printable pixels that overlap between different planes.
- the "logical sum" pattern is literally a pattern obtained by performing a logical sum operation on the same pixel position between a plurality of planes, as shown in FIG. Specifically, when a record-allowed pixel ("1") exists at any pixel position of a plurality of (two in the example shown in the figure) plane, a pattern obtained by extracting the position is a logical sum pattern. .
- This logical sum pattern is a single plane that shows the arrangement of print-permitted pixels for different planes.
- the influence of other planes can be made relatively small, and the dispersibility within the same plane can be improved.
- the recordable pixel distribution (logical pattern) of the two planes superimposed is a good distribution with low frequency components and little dispersion. In this way, both the dispersibility of the print permitting pixels of the same plane and different planes are improved.
- the term ⁇ s (n) E (r) is basically a force that gives an effect of good dispersion of the overlapping recordable pixels, as described in FIGS. 10A to 10D.
- this term is set so that the potential increases as the number of overlaps increases, and the energy is reduced by moving or arranging the recording-permitted pixels one by one according to the potential to reduce the energy.
- This has the effect of reducing the number of overlaps in the process.
- a E (r) has the same effect of reducing the number of adjacent print-permitted pixels in the same plane.
- the term y s (n) E (r) also has the effect of reducing the number of overlaps by simply dispersing the overlapping print permitting pixels as much as possible.
- the number of print permitting pixels in the block of print permitting pixels due to adjacency or overlap is reduced as much as possible, and as a result, a print permitting pixel distribution with a low low frequency component can be obtained.
- the present embodiment it is effective to make the interaction between the planes different from each other in consideration of the magnitude of the force interaction and the like that are all j8 E (r). For example, if the number of planes is large, the repulsive potential between the planes of the mask used for ink that is applied as close as possible is made larger than other repulsive potentials. It is also effective to change the coefficient of Mari j8 E (r) and the shape of E (r) between planes. Further, for example, in the case of fixing using a reaction system, when a reaction liquid or ink having such a component is ejected by a recording head, a mask plane used for the reaction liquid or the like and the reaction action of the reaction liquid or the like is affected.
- the more uniformly the print-permitted pixels or their overlaps are distributed the more “good dispersion” or “the dispersion is better”.
- “Uniform dispersion” means that the total energy is as low as possible in the above repulsive potential example, that is, if there are overlapping printable pixels or adjacent clusters, In this state, the number of adjacent pixels is reduced as much as possible. Further, in such a state, the print permitting pixels are arranged as evenly as possible.
- “low frequency component is reduced (decreased)” means that when the dispersion is good as described above, in the power spectrum described later about the distribution, a region with high sensitivity in human visual characteristics (low frequency region) This means that the variance decreases (decreases) according to the degree of goodness.
- FIG. 14 to FIG. 16 are diagrams showing the layout patterns of the print permitting pixels of the masks Cl, Ml, Y1 (hereinafter referred to as “laminated masks” t) of the present embodiment manufactured by the above-described manufacturing method.
- FIG. 17 and FIG. 18 are diagrams showing similar patterns of the conventional mask. Specifically, FIG. 17 shows a pattern of a mask (referred to as “distributed mask of only its own plane”) that can be used in the first pass of cyan ink as shown in Patent Document 1, and FIG. The pattern of the described random mask is shown.
- Each mask pattern shown in FIGS. 14 to 18 has an area of 256 ⁇ 256 pixels.
- pixels shown in white are non-recordable pixels (that is, pixels that are masked regardless of the image data of that pixel), and pixels shown in black are printable pixels (that is, depending on the image data of that pixel).
- Each pixel) in which dots are to be formed is only the random mask shown in FIG. 18 has an impression that the visual roughness is high and the sliding force is poor compared to other masks. This is also a force that randomly determines the arrangement of print permitting pixels of dots without considering the correlation of dot arrangement in that plane (coefficient ⁇ ) when creating a random mask pattern.
- the “distribution mask only for its own plane” (FIG. 17) and the mask pattern of this embodiment (FIGS. 14 to 16) take into account the dispersibility within the same plane due to the effect of the coefficient ⁇ . Since the print permitting pixels are arranged, there is no bias in the distribution of the print permitting pixels, and the overall impression is smooth.
- FIGS. 19 and 20 are diagrams showing a logical sum pattern and a logical product pattern of the laminated masks Cl and Ml of the present embodiment shown in FIGS. 14 and 15, respectively.
- FIGS. 21 and 22 are diagrams showing a logical sum pattern and a logical product pattern of the laminated masks Cl, Ml, and Y1 shown in FIGS. 14, 15, and 16, respectively.
- FIGS. 23 and 24 are diagrams showing a logical sum pattern and a logical product pattern, respectively, of the dispersion mask of only the own plane according to the conventional example, and FIGS. 25 and 26 similarly illustrate the random mask according to the conventional example. It is a figure which shows each logical sum pattern and logical product pattern.
- the arrangement (logical AND) of things is well distributed and has no rough feeling. This is because, as described above, the dispersion of the recordable pixels between the two planes is considered (coefficient ⁇ ) and the dispersion of the overlap itself is taken into account (coefficient ⁇ s (n)) LTV.
- the logical sum pattern of the print permitting pixels when the three masks of the present embodiment are overlaid is such that the print permitting pixels are arranged without any gaps.
- this embodiment considers the dispersion of the recording allowable pixels among the three planes (coefficient ⁇ ), the recording allowable pixels of the three planes are well distributed. It will be arranged without gaps.
- each plane is a uniform mask for 2-pass printing, print permitting pixels are arranged at 50% density. Therefore, the density of the overlap of the three planes is 150% and the overlap cannot be excluded, but in the present embodiment, the overlap is limited to two overlaps by the coefficient ⁇ s (n).
- the result is shown in Figure 22. As can be seen, the logical product pattern from which three overlaps are extracted does not exist.
- this “overlapping” pattern corresponds to the case where a print allowable pixel (“1”) exists in any one of the mask pixels of a plurality of planes (two in the example shown in the figure).
- This is a pattern in which there is data corresponding to the number of data “1” indicating the recordable pixel in the pixel to be recorded and when the recordable pixel overlaps with the same mask pixel. For example, if the overlap is 2, “2”, if it is 3, “3”.
- a “superposition pattern” to be described later is represented by a density corresponding to the number indicated by the data. In other words, the black density increases as the number of printable pixels overlaps.
- This superposition pattern can indicate the arrangement of print permitting pixels for each of different planes as a single plane, and can also indicate the arrangement of overlapping print permitting pixels along with the degree of overlap.
- FIG. 28 and FIG. 29 are diagrams showing “overlapping” patterns when two and three stacked masks of this embodiment are stacked, respectively.
- the patterns shown in FIG. 28 and FIG. 29 represent patterns close to the ink dot pattern of the intermediate image when recording is performed using the mask of the present embodiment. Therefore, these patterns also indicate that the ink dots and their overlap in the intermediate image are well dispersed.
- Figs. 30 and 31 show a dispersion mask and a random mask of only the own plane according to the conventional example. It is a figure which shows the "superposition" pattern when two discs are accumulated. As shown in these figures, it can be seen that the “overlapping” pattern using the mask of the conventional example also has a good recording dispersibility pixel and the dispersion of the overlapping.
- the mask of this embodiment is evaluated based on the power spectrum indicating the frequency characteristics of the mask pattern.
- the power spectrum described below is obtained when the recordable pixels are replaced with the dot arrangement, and the power spectrum is obtained for a plane having a size of 256 pixels ⁇ 256 pixels.
- the power spectrum is based on “T. Mitsa and KJ Parker,“ Digital Halftoning using a Blue Noise Mask ”, Proc. SPIE 1452, pp. 47—56 (1991)”, which can treat two-dimensional spatial frequencies as one dimension. &) In the described radial averaged peak spectrum.
- FIG. 32 is a diagram for explaining the frequency characteristics of a single mask pattern (C1) for each of the laminated mask of the present embodiment, the dispersion mask only for the own plane according to the conventional example, and the random mask.
- FIG. 33 is a diagram for explaining the frequency characteristics of the logical sum pattern of two masks (Cl, Ml) for each of these three types of masks.
- Figure 34 is a diagram illustrating the frequency characteristics of the logical product pattern of two masks (Cl, Ml) for each of these three types of masks.
- each curve represents a power vector with respect to the spatial frequency of each mask pattern.
- Curve a is the power spectrum of the mask pattern (Fig. 14) of the stacked mask of this embodiment
- curve b is the power spectrum of the dispersion mask pattern (Fig. 17) only for its own plane
- curve c is random.
- the respective spectra of the mask pattern (Fig. 18) are shown. Comparing these three curves, it can be seen that the random mask (curve c) has substantially uniform power over the entire spatial frequency. Random masks do not have a special feature in the interval at which the recordable pixels are dispersed because the arrangement of the recordable pixels is randomly determined. Therefore, the distribution is substantially uniform from the low frequency region to the high frequency region.
- the power is low in the low frequency region, and the power peak exists at the high frequency. This is because the recordable pixels are somewhat While maintaining the distance, it shows that the distance is approximately evenly distributed.
- the present invention focuses on a low frequency region where visual roughness is a concern and suppresses the low frequency component.
- the mask pattern of the present invention is characterized in that such low frequency power is kept low.
- the frequency characteristics related to the sensitivity of the human eye depend on the distance between the recorded material and the human eye, for example, Dooley (“RP Dooley: Prediction Brightness Appearance at Edges Using Linear and Non-Liner Visual Describing Functions, SPES annual Meeting (1975))).
- Dooley RP Dooley: Prediction Brightness Appearance at Edges Using Linear and Non-Liner Visual Describing Functions, SPES annual Meeting (1975)
- components in the frequency range lower than approximately lOcycles / mm are recognized by the human eye.
- the present inventor has also confirmed experimentally. Therefore, it can be said that it is important to focus on the region including the low frequency side (low frequency region) from lOcycles / mm.
- the power vector of the logical sum and logical product pattern when the masks are overlapped as shown in FIGS. 33 and 34 is the cone mask dispersion mask (curve b) according to the conventional example.
- the number of low frequency components is larger than that of the laminated mask (curve a) of this embodiment. That is, as shown in FIG. 23 and FIG. 24, the arrangement of the print permitting pixels in the dispersion mask of only the own plane according to the conventional example is inferior in dispersion as compared with the laminated mask of this embodiment.
- FIGS. 35 and 36 show the “superposition” when the laminated mask of this embodiment, the dispersion mask of the self-plane only according to the conventional example, and the random mask of only the self-plane and two random masks are superposed, respectively.
- the curve a shows the power spectrum of the overlay pattern (FIGS. 28 and 29) of the laminated mask of the present embodiment
- the curve b shows the overlap of the dispersion mask of only the own plane according to the conventional example.
- the power spectrum of the stitching pattern (Fig. 30) is shown
- curve c shows the power spectrum of the random mask overlay pattern (Fig. 31) according to the conventional example.
- the random mask has substantially uniform power over the entire spatial frequency as in the power spectrum of the single mask, the logical sum pattern, and the logical product pattern.
- the dispersion pattern of the dispersion mask with only its own plane shown by curve b has more low frequency components than the dispersion mask with only its own plane shown in FIG.
- the superposition pattern of the dispersion mask mask of only the self plane indicated by the curve b has more low frequency components than the superposition pattern of the laminated mask of this embodiment. That is, as shown in FIG. 30, the dispersion becomes worse and the feeling of roughness of the pattern increases.
- the low frequency component of the overlay pattern of the laminated mask of the present embodiment indicated by the curve a is hardly changed even when compared with the single laminated mask shown in FIG. This indicates that even when the three planes are overlapped, the recordable pixels are distributed substantially evenly while maintaining a certain distance.
- the mask according to the embodiment of the present invention is a mask of different planes.
- the dispersibility of the print permitting pixels is greatly reduced.
- dispersibility is greatly reduced if the overlap is different from the normal overlap when considering the dispersion.
- the dispersibility between different planes is not considered, and therefore the dispersibility does not change even if the overlap is different from the normal overlap.
- FIG. 37 to FIG. 39 are diagrams showing the logical sum, logical product, and “superposition” patterns when Cl and Ml are superposed when the masks are shifted and superposed.
- the dispersibility of any of the overlapping patterns of the stacked masks Cl and Ml of the present embodiment shifted in the overlapping position, logical product, and “overlapping” is reduced, and no turn is observed. If you do this, the feeling of roughness will increase.
- FIGs. 40 to 42 are diagrams comparing the power spectra when the overlapping position is shifted and when the overlapping position is not shifted (that is, when overlapping is performed at a normal position).
- FIG. 10 is a diagram showing a power spectrum of a logical sum pattern of a laminated mask of FIG.
- the low frequency component when shifted is relatively large as compared with the case where there is no shift. This is because, as described above, the laminated mask considers dispersion even between different planes, so if the overlay method is different from the normal overlay when considering the dispersion, the dispersibility This is because of a significant drop.
- the dispersion mask and random mask of only the own plane according to the conventional example shown in FIG. 41 and FIG. 42 change almost to the low frequency component of the power spectrum when shifted and when not shifted. There is no. This is because these mask forces do not originally take into account the dispersion of print-permitted pixels between different planes, so even if the overlapping position shifts, there will be no significant difference in the dispersion in the pattern when superimposed. is there.
- FIGS. 43 to 45 are similar to the diagrams shown in FIGS. 40 to 42. It is a comparison figure of a power spectrum in case there is no. 43 to 45 are diagrams showing the power spectrum of the logical product pattern of the stacked mask of this embodiment, the dispersion mask of only the own plane according to the conventional example, and the random mask, respectively. 46 to 48 are comparison diagrams of power spectra when the overlapping position is shifted and not shifted. The laminated mask of this embodiment, the dispersion mask of only the own plane according to the conventional example, and the random mask are respectively shown. It is a figure which shows the power spectrum of the "superimposition" pattern of a mark.
- the low-frequency component in the laminated mask of this embodiment is greatly increased as compared with the case of no shifting.
- the dispersion mask and the random mask of only the own plane according to the conventional example have almost no change in the low frequency component of the power spectrum between the case of shifting and the case of no shifting.
- the power spectrum of the “overlapping” pattern when the three laminated masks Cl, Ml, and Y 1 of this embodiment shown in FIG. Increase.
- FIG. 50 to FIG. 52 are diagrams showing the evaluation by the above shift in terms of the amount of the low frequency component.
- the amount of the low-frequency component is obtained by integrating 90 or less components corresponding to approximately half of the spatial frequency region where the power spectrum exists.
- the shifted ones are the logical sum, logical product, “overlapping” pattern of masks Cl and Ml, and masks Cl, Ml, Y 1. It can be seen that the amount of the low-frequency component increases in any of the “overlapping” patterns in FIG.
- the amount of the low frequency component does not change between the dispersion mask of the own plane shown in FIG. 51 and the random mask shown in FIG.
- the present embodiment relates to 4-pass multi-pass printing that completes an image in four scans for each ink of cyan (C), magenta (M), yellow (Y), and black (K).
- C cyan
- M magenta
- Y yellow
- K black
- a plurality of (in this embodiment, four times) scans are used. Are also well dispersed.
- the cyan, magenta, and yellow color nozzle groups are divided into four groups, the first group to the fourth group, and each group includes 128 nozzles.
- Each group is associated with the mask pattern (Cl, C2, C3, C4, Ml, M2, M3, M4, Yl, Y2, Y3, Y4) of this embodiment, and the sub-scan direction of each mask pattern
- the size of (transport direction) is 128 pixels, the same as the number of nozzles in each group. On the other hand, the size in the scanning direction is 256 pixels.
- the four mask patterns (Cl, C2, C3 and C4, Ml, M2, M3 and M4, Yl, Y2, Y3 and Y4) corresponding to the same color ink nozzle group are complemented by 4 patterns respectively. It has a relationship corresponding to all pixels, and when these are overlapped, recording of an area corresponding to 128 ⁇ 256 pixels is completed.
- each color nozzle group ejects ink onto a printing medium while scanning in a direction substantially perpendicular to the nozzle arrangement direction. For example, C, M, and Y ink ejection is performed on each region.
- the recording medium is conveyed by the width of one loop (that is, 128 pixels) in the direction orthogonal to the scanning direction. As a result, an image having a size corresponding to the width of each group of the recording medium is completed by four scans.
- the second group of the C nozzle group, the second group of the M nozzle group, and the second group of the Y nozzle group are applied to the area A where the recording in the first scan is completed.
- recording is performed using the first group of the C nozzle group, the first group of the M nozzle group, and the first group of the Y nozzle group for the unrecorded region B. Therefore, in the second scan, mask pattern C2, mask pattern M2, and mask pattern Y2 are used for area A, and mask pattern Cl, mask pattern Ml, and mask pattern Y1 are used for area B.
- the third group of the C nozzle group, the third group of the M nozzle group, and the third group of the Y nozzle group are used for the area A where the recording in the second scan is completed.
- recording is performed for area B using the second group of the C nozzle group, the second group of the M nozzle group, and the second group of the Y nozzle group.
- recording is performed using the first group of the C nozzle group, the first group of the M nozzle group, and the first group of the Y nozzle group.
- mask pattern C3, mask pattern M3, and mask pattern Y3 are used for area A
- mask pattern C2, mask pattern M2, and mask pattern Y2 are used for area B
- area C is used for area C.
- mask pattern Cl, mask pattern Ml, and mask pattern Y1 are used.
- the fourth group of the C nozzle group, the fourth group of the M nozzle group, and the fourth group of the Y nozzle group are used for the area A where the recording of the third scan is completed.
- area C is recorded using the third group of the C nozzle group, the third group of the M nozzle group, and the third group of the Y nozzle group.
- recording is performed using the second group of the C nozzle group, the second group of the M nozzle group, and the second group of the Y nozzle group. Recording is performed using the first group, the first group of the M nozzle group, and the first group of the Y nozzle group.
- mask pattern C4, mask pattern M4, and mask pattern Y4 are used for region A, and mask pattern C3, mask pattern M3, and mask are used for region B.
- Pattern Y3 is used, mask pattern C2, mask pattern M2, and mask pattern Y2 are used for area C, and mask pattern Cl, mask pattern Ml, and mask pattern Y1 are used for area D.
- the image recording for the area A on the recording medium is completed in four scans. Recording is performed in the same way for area B and subsequent areas.
- the arrangement of the print permitting pixels when the masks of the respective planes are overlaid is aperiodic and low frequency components are present. Less dispersible. This eliminates as much as possible the proximity or adjacency of dots and dot overlap in the intermediate image at each stage leading to the completion of the image. In addition, even if dot overlap and adjacency cannot be completely excluded, even if such overlap occurs, the dispersibility should be high.
- the simultaneous generation method described in the first embodiment or the generation method for each pass can be used.
- the simultaneous generation method and the generation method for each path are not the same. Hereinafter, these methods will be described in order.
- FIG. 53 is a diagram for conceptually explaining the simultaneous generation method of the present embodiment.
- the simultaneous generation method of the present embodiment uses masks (Cl, Ml, Yl), (C2, M2, Y2) and (C3) which are masks for the first to third passes.
- M3, Y3) are generated simultaneously in step 1.
- the masks (C4, M4, Y4) for each plane used for the 4th pass are changed to the masks (Cl, Ml, Yl), (C2, M2, Y2) for the 1st to 3rd passes. ) And (C3, M3, Y3) and each color are generated in a complementary relationship.
- the mask for the fourth pass is generated for each color so that the arrangement of the print permitting pixels has an exclusive relationship with the arrangement of the print permitting pixels of the first pass through the pass mask.
- step S801 in FIG. 8 the masks (Cl, Ml, Yl), (C2, M2, Y2), (C3, M3, Y3) for the first to third passes, respectively. Acquire 25% density images of C, M, and Y corresponding to the size of the plane. Then, as in step S802, each image is binarized using a binary method such as an error diffusion method. As a result, for each mask (Cl, Ml, Yl), (C2, M2, Y2), (C3, M3, Y3), the initial layout in which the recordable pixels are arranged at 25% of the total mask pixels. Can be obtained.
- step S803 all the planes of the masks (Cl, Ml, Yl), (C2, M2, Y2), (C3, M3, Y3) obtained as described above are used. Calculate the repulsive potential for the recordable pixels.
- the influence of the recording allowable pixel in the distance r of another plane of a different color is the same as in the embodiment.
- the influence of the recording allowable pixels at the distance r in different planes Cl and C3 of the same color is 2.
- the dispersion of the recordable pixels when the masks of the same color are superimposed is ensured in preference to the dispersion of the recordable pixels of different colors ( ⁇ 8 is 1).
- step S804 of FIG. 8 energy attenuation is performed as described with reference to FIGS.
- the differences from the first embodiment are as follows.
- all the printable pixels of the 9 planes calculated in the process so far, and in turn, the printable pixel is the pixel with the lowest repulsive potential among the pixels within the distance r of the printable pixel force.
- a complementary relationship between the masks of the same color for 3 passes can be obtained.
- the sequential arrangement method in the simultaneous generation is basically the same as the processing described in the first embodiment with reference to FIG. The difference is the same as that described in the arrangement movement method.
- Ie The effect of recording tolerance pixels on other planes of different colors when calculating the repulsive potential; i8 E (r) weighting factor
- the target recording allowable pixel is arranged at the pixel with the lowest potential, the overlapping of the recording allowable pixels in the same color (plane) is prohibited.
- this arrangement ends the process of arranging 25% of each plane (see step S1106 in Fig. 11).
- FIG. 54 is a diagram conceptually illustrating the generation method for each path according to the present embodiment.
- step 1 the mask for the first pass is used.
- Step 4 the masks (C4, M4, Y4) of the planes used for the fourth pass are changed to the masks (Cl, Ml, Yl), (C2, M2) of the first to third passes generated above. , Y2) and (C3, M3, Y3) and each color are generated in a complementary relationship.
- the mask for the fourth pass is generated for each color so that the arrangement of the print permitting pixels has an exclusive relationship with the arrangement of the print permitting pixels of the masks for the first pass to the pass.
- step S801 in FIG. 8 images of 25% density of C, M, and Y corresponding to the size of the plane of each color mask (Cl, Ml, Yl) in the first pass are acquired. Then, as in step S802, each image is binarized using a binary key method such as an error diffusion method. As a result, for each plane (Cl, Ml, Yl) of each mask, it is possible to obtain an initial arrangement in which print permitting pixels are arranged in 25% of the entire mask pixels. [0166] Next, as in step S803, the repulsive potential is calculated for all the print permitting pixels of each plane of the mask (Cl, Ml, Y1) obtained as described above.
- This repulsive potential calculation is different from the application process of Embodiment 1 in the same way as the placement movement method in the simultaneous generation described above. That is, when calculating the repulsive potential of a certain permissible pixel, the effect of other permissible recording pixels at the distance r of other planes of different colors; the value of the weighting factor
- 8 E (r) is 3.
- the dispersion of the print permitting pixels (j8 is 3) when the masks of the same color are overlapped is ensured in preference to the dispersion with the print permitting pixels of different colors (
- 8 value of 1 is the same as in the first embodiment. It is possible to obtain a pattern that is highly arranged.
- the sequential arrangement method for generating each node is basically the same as that described in FIG. The difference is the same as that described in the arrangement movement method.
- 8 is set to 1 and different colors of the same color
- the influence of the recording allowable pixel force on the screen; the weighting coefficient ⁇ of ⁇ E (r) is 3.
- the pass pattern generated up to that point; the arrangement of the recording allowable pixel is fixed. Thereby, the mutual complementarity of the mask patterns from the first pass to the third pass can be guaranteed.
- FIG. 55 to FIG. 57 are diagrams showing the arrangement patterns of the print permitting pixels of each of the multi-layer masks Cl, Ml, Y1 of the present embodiment manufactured by any one of the above-described manufacturing methods.
- Each mask pattern has an area of 128 ⁇ 256 pixels.
- the mask pattern according to the present embodiment has the print permitting pixels in consideration of the dispersibility in the same plane due to the effect of the coefficient ⁇ . Get a smooth impression.
- 58 to 60 show three (Cl, Ml, Yl), six (C1, Ml, Yl, C2, M2, Y2) and nine (Cl, It is a figure which shows the "superposition" pattern when Ml, Yl, C2, M2, Y2, C3, M3, Y3) are overlapped at regular positions.
- the “overlapping” pattern when a plurality of these layer masks are overlapped represents the logical sum pattern of those masks as a lighter and darker, and the logical product pattern as a darker and darker.
- the “overlapping” patterns shown in these drawings represent patterns that are close to the ink dot pattern of the intermediate image when recording is performed using the mask of the present embodiment. Therefore, it can be seen from these patterns that the ink dots and their overlap in the intermediate image are well dispersed.
- FIG. 61 is a diagram showing a “superposition” pattern when the three stacked masks (Cl, Ml, Yl) shown in FIG. 58 are shifted and overlapped.
- FIG. 62 shows a “superposition” pattern when the six laminated masks (Cl, Ml, Yl, C2, M2, Y2) shown in FIG.
- Fig. 63 shows the "overlapping" pattern when the nine stacked masks (Cl, Ml, Yl, C2, M2, Y2, C3, M3, Y3) shown in Fig. 60 are shifted and overlapped.
- FIG. 61 is a diagram showing a “superposition” pattern when the three stacked masks (Cl, Ml, Yl) shown in FIG. 58 are shifted and overlapped.
- FIG. 62 shows a “superposition” pattern when the six laminated masks (Cl, Ml, Yl, C2, M2, Y2) shown in FIG.
- Fig. 63 shows the "overlapping" pattern when
- the pattern (Fig. 61) is not shifted in the overlapping pattern (Figs. 61 to 63) in which the stacking position of the stacking mask of this embodiment is shifted. Compared with (5 8 to Fig. 60), the dispersibility is reduced, and the feeling of roughness when observing the pattern is increased. Yes.
- Fig. 64 is a diagram showing the evaluation based on the above-described shift in terms of the amount of low frequency components.
- 3 (Cl, Ml, Yl), 6 (Cl, Ml, Yl, C2, M2, Y2) and 9 (CI, Ml, Yl, C2, M2, Y2, C3, M3, Compare the amount of low-frequency components in the case of Y3) with different [masking] and [overlay] patterns (Fig. 61 to Fig. 63) and without shifting (Figs. 58 to 60). Show and show.
- the shifted one is compared with the case where it is not shifted in any pattern (that is, when it is overlapped at the normal position). In other words, the amount of low frequency components increases.
- whether or not the mask is the one to which the present invention is applied is determined based on whether or not the evaluation value related to dispersibility changes greatly when the overlapping position is shifted. As described above, this can be done.
- the mask pattern in the present embodiment has a size of horizontal: 256 pixels X vertical: 128 pixels, and the vertical and horizontal sizes are different.
- align the vertical and horizontal sizes of the mask pattern to determine the frequency component of the force in this embodiment, in order to align the vertical and horizontal sizes to the size in the longitudinal direction (in this embodiment, 256 pixels in the horizontal direction), the pattern was repeated vertically and the frequency component was evaluated as a pattern of 256 pixels by 256 pixels. .
- the frequency component is evaluated for a pattern in which the vertical and horizontal sizes are aligned with the size in the longitudinal direction. Specifically, the pattern is repeated in the short direction until the size in the short direction of the pattern is equal to or greater than the size in the long direction, the medium force pattern is cut out, and the cut pattern is evaluated.
- the vertical and horizontal sizes are preferably 2 to the nth power (n is a positive integer) so that the fast Fourier transform can be used when performing the frequency conversion. If it is not 2 n, the 2 n power closest to the size in the longitudinal direction is specified, and the pattern is repeated vertically and horizontally so that it can be cut out with the specified 2 n size.
- the above-identified pattern of 2 n size is extracted, and the extracted pattern is evaluated.
- the mask pattern is horizontal: 500 pixels X vertical: 320 pixels.
- the 2 nth power closest to “500” is specified.
- the nearest 2 to the power of n is identified as “512”. Therefore, in order to cut out a pattern of 512 pixels by 512 pixels, the pattern is repeated once in the horizontal and vertical directions to generate a pattern of 1000 pixels by 640 pixels.
- a pattern of the medium power 512 pixels x 512 pixels of the 1000 pixel x 640 pixel pattern generated in this way is cut out, and the cut out pattern is evaluated.
- Emodiment 3 100% gradation mask for 2-pass recording
- This embodiment relates to a so-called gradation mask.
- the gradation mask is known from Patent Document 3, for example.
- Gradation is a mask with a different recording rate depending on the nozzle position, such that the recording rate at the center of the nozzle row is low and the central recording rate is set high. According to this mask, the effect of improving the image quality can be obtained by relatively reducing the frequency of the discharge of the end nozzle, which is likely to cause harmful effects at the boundary of the recording area of each pass in multi-pass printing. .
- the "printing rate" of the mask pattern described above is the ratio of the number of pixels allowed for printing to the total number of pixels (the sum of pixels allowed for printing and pixels allowed for printing) included in a certain area in the mask pattern. It is.
- the printing rate of the mask pattern corresponding to a single nozzle is the ratio of the printing allowable pixels to the total number of pixels included in the area corresponding to the single nozzle (single raster area).
- the present invention provides a gradation mask in which a plurality of regions corresponding to each of the recording rates changing in the mask maintain high dispersibility, and the recording rate is changed between the regions. And the effect described in Patent Document 3 can be obtained.
- FIGS. 65A and 65B are diagrams showing a printing rate corresponding to the nozzle position of the gradation mask according to the present embodiment, and mutually exclusive mask patterns of two planes.
- the two-plane mask is a cyan two-plane mask Cl, C 2.
- the figure typically shows cyan masks Cl and C2.
- the arrangement of the print permitting pixels of these six masks is dispersed among each other.
- each scan printing is performed with the nozzles with numbers 0 to 255 corresponding to the mask C2, and the nozzles with numbers 256 to 511 corresponding to the mask C1.
- mask C1 and mask C2 have a complementary relationship.
- the recording medium is conveyed by an amount corresponding to the length of 256 nozzle arrays.
- two-pass printing is performed in which the areas corresponding to the 256 nozzle arrays are complemented by the masks C1 and C2.
- the mask C1 and the mask C2 each have a recording rate of 0.3 force, etc.
- each raster (nozzle) up to 7, and the total of each plane has a recording rate of 50%.
- the number of print-allowable pixels in each raster of the mask is determined by the print rate. For example, in a raster with a printing rate of 0.4 (40%), if the mask raster size is 1000 pixels, approximately 400 printable pixels are arranged.
- the same method as described in the first embodiment can be used.
- the simultaneous generation method and the generation method for each pass are the same.
- the placement movement method or the sequential placement method will be described in order.
- FIG. 66 is a flowchart showing an arrangement determination process based on the arrangement movement method of the printable pixels of the gradation mask used in the two-pass printing of this embodiment.
- the processing shown in the figure is basically the same as the processing shown in FIG. Below, the differences Is mainly explained.
- steps S6601 and S6602 is the same as the processing in steps S801 and S802 shown in FIG.
- the processing in step S6603 is the same as the processing in step S803, and the repulsive potential is applied to all the recording allowable pixels arranged for each raster as described above in each plane of the masks Cl, Ml, and Y1.
- step S6604 as in step S804 of Fig. 8, the repulsive potentials obtained as described above for the recording allowable pixels of each plane are summed for the three planes C1, Ml, and Y1. Find the total energy. Then, as described above with reference to FIGS.
- the reduction rate of the total energy is calculated, and when it is determined that it is equal to or less than a predetermined value, the energy attenuation process is terminated. Then, each plane in which the rate of decrease in total energy is below the specified value is set as the first pass mask Cl, Ml, Y1. In addition, the masks C2, M2, and Y2 for the second pass are set with the print-permitted pixel positions at positions exclusive to the print-permitted pixel positions of these masks.
- whether or not to end the energy attenuation process is determined based on whether or not the force is below the predetermined amount of total energy, rather than using the rate of decrease in total energy. You can do it!
- FIG. 67 is a flowchart showing a recording-permitted pixel arrangement determination process by the sequential arrangement method of this embodiment.
- steps S6701 to S6703, S6705, S6706, and S6707 in FIG. 67 is the same as the processing in S1101 to S1103, S1105, S1106, and S1107 in FIG. [0195]
- step S6704 when placing a print-allowable pixel on a pixel with the lowest energy in the plane, if the number of placements per raster determined according to the printing rate is exceeded, the number of placements The raster is within the limit, and the next low energy pixel is placed on the low energy pixel of the raster. This makes it possible to obtain a highly dispersive gradation mask while changing the recording rate for each raster.
- the force for managing the number of arrangements for each raster is not limited to this.
- the arrangement number is limited for each of the plurality of rasters.
- FIG. 68 to FIG. 70 are diagrams showing arrangement patterns of the print permitting pixels of the masks Cl, Ml, and Y1 for one plane of the present embodiment manufactured by any of the above-described manufacturing methods.
- Each mask pattern has an area of 256 ⁇ 256 pixels.
- the mask pattern of the present embodiment has the recording tolerance pixels in consideration of the dispersibility in the same plane due to the effect of the coefficient ⁇ in particular. Except for the bias of the print permitting pixels, there is no bias in the dispersion of the print permitting pixels and the overall impression is smooth.
- FIG. 71 and FIG. 72 are diagrams showing a logical sum pattern and a logical product pattern of the laminated masks Cl and Ml of the present embodiment shown in FIG. 68 and FIG. 69, respectively.
- the arrangement (logical product) of the objects has a well-distributed and non-grainy feeling, with the exception of uneven distribution due to gradation. As described above, this is also the force that considers the variance of the print-allowable pixels between the two planes (coefficient ⁇ ) and the variance of the overlap itself (coefficient ⁇ s ( ⁇ ;)).
- FIG. 73 and FIG. 74 are diagrams showing “overlapping” patterns when two and three stacked masks of this embodiment are stacked, respectively.
- the “overlapping” pattern when layered masks Cl and Ml are overlaid is the logical sum pattern of these two masks (Fig. 71) at a low density.
- the logical product pattern (Fig. 72) is shown in a darker density.
- the “overlapping” pattern when layered masks Cl, Ml, and Yl are overlaid is the logical sum pattern of these three masks.
- the logical product pattern is expressed in terms of density and density in terms of V and density.
- the “overlapping” patterns shown in FIG. 73 and FIG. 74 represent patterns that are close to the ink dot pattern of the intermediate image when recording is performed using the mask of this embodiment. Therefore, it can be seen from these patterns that ink dots and their overlap in the intermediate image are well dispersed.
- the gradation mask according to this embodiment is also evaluated by shifting as in the above embodiments.
- 75 to 77 are diagrams showing logical sum, logical product, and “superposition” patterns when the masks Cl and Ml shown in FIG. 68 and FIG.
- the logical sum, logical product, and “superposition” patterns when the superposition positions of the laminated masks Cl and Ml of this embodiment are shifted are various patterns superposed at regular positions ( Compared with Fig. 71 to Fig. 7 3), the dispersibility is lowered, and the feeling of roughness when the pattern is observed is increased.
- FIG. 78 is a diagram showing an “overlapping” pattern when the stacked masks Cl, Ml, and Yl are shifted and overlapped.
- the “superposition” pattern when the overlay position of the multilayer masks Cl, Ml, Yl of this embodiment is shifted is also different from the pattern (FIG. 74) overlaid at the regular position. The dispersibility decreases, and the feeling of roughness increases when the pattern is observed.
- FIG. 79 to FIG. 81 are diagrams comparing the power spectra when the overlapping position is shifted and when the overlapping position is not shifted (that is, when overlapping is performed at a normal position). Specifically, it is a diagram showing the power spectrum when the logical sum, logical product, and [overlapping] pattern of the two laminated masks CI and Ml of this embodiment are shifted and not shifted.
- FIG. 82 is a diagram showing the power spectrum when the [overlapping] pattern of the three laminated masks of this embodiment is shifted and when it is not shifted.
- the low-frequency component when shifted is the case where there is no shift in any of logical sum, logical product, and [overlapping]. In It becomes larger than that. This is because, as described above, the laminated mask considers dispersion even between different planes. Therefore, when the overlay method is different from the normal overlay when considering the dispersion, the dispersibility is large. It is also the power to decline.
- the power is increased when the spatial frequency is around 1 to 20. This is because the recording rate is changed as a gradation mask. That is, such a relatively small spatial frequency, that is, a bias in the arrangement of the recordable pixels having a large period, is recognized as a gradation for the time being, and this is unnecessary for the present invention to control. It is not recognized as a bias of low frequency components.
- Fig. 83 is a diagram showing the evaluation based on the shift described above in terms of the amount of low frequency components.
- the two stacked masks Cl and Ml of the present embodiment the logical sum, the logical product, the “overlapping” pattern, and the “overlapping” patterns of the masks Cl, Ml, and Y1 are shifted and shifted. Compare and show the amount of low frequency components in the case.
- Each of the Ml logical sum, logical product, “overlapping” patterns and masks Cl, Ml, Y1 “overlapping” patterns has a larger amount of low-frequency components than the unshifted pattern.
- the masks of a plurality of planes of the same color are in a complementary relationship with each other, and the arrangement of print permitting pixels is exclusive between the planes.
- the application of the present invention is not limited to such a mask.
- the present invention can also be applied to a mask having a plurality of planes exceeding 100% when the recording rates of a plurality of masks of the same color are combined. If a mask exceeding 100% is used, the maximum ink injection amount can be increased even when the resolution of the image data is low.
- two planes of the same color used for two-pass printing are used. Each of them relates to a mask that has a recording rate of 75% and a total recording rate of 150%.
- Fig. 84 is a schematic diagram conceptually illustrating a mask used for the two-pass printing.
- P0001 indicates a recording head of one color among C, M, and Y, and here, it is shown as having eight nozzles for simplicity of illustration.
- the nozzles are divided into two groups, 1st and 2nd, and each nozzle group contains 4 nozzles.
- ⁇ 0002 ⁇ and ⁇ 0002 ⁇ indicate mask patterns corresponding to the first and second groups of nozzle rows, respectively. That is, the mask pattern ⁇ 0002 ⁇ (lower pattern in the figure) used in the first scan and the mask pattern P0002B (upper pattern in the figure) used in the second scan. Each of these becomes a 1-plane mask.
- each mask pattern the print permitting pixels are shown in black, and the non-printing allowance pixels are shown in white.
- the mask pattern P0002A for the first scan and the mask pattern POOO 2B for the second scan each have a recording rate of 75%, that is, a pattern in which the ratio of the number of printable pixels to the total mask pixels in each pattern is 75%. is there. Therefore, when these are overlapped, the pattern allows for a recordable pixel of 150% of the 4 ⁇ 4 area, that is, a pattern including overlap. Note that the pattern shown in the figure is conceptually different from the mask pattern of the present embodiment shown below for easy explanation.
- P0003 and P0004 show images that are completed by two-pass printing, with dot arrangements constituting the images.
- one dot is placed in a pixel, it is indicated as “1”, and when two dots are placed, it is indicated as “2”.
- this image is a so-called solid image in which dots are formed on all the pixels for the sake of easy explanation. Therefore, the arrangement of the print allowable pixels of the mask P0002 used to generate the dot print data is reflected as it is. The dotted dot arrangement is shown.
- the first scan the first group of dot recording data is generated using the mask pattern P0002A.
- an image in which 75% of dots of all pixels are filled is formed.
- the recording medium is conveyed upward in the drawing by the width of the nozzle group.
- the dot recording data of the first group for the area shifted by the carry amount is also generated using the mask pattern P0002A and recorded in the first group.
- the second group of dot recording data for the recorded area is generated using the mask pattern P0002B.
- the mask manufacturing method of the present embodiment can be performed basically in the same manner as in the first embodiment.
- step S1106 it is determined whether or not the print permitting pixels are arranged up to 75% in both generations of steps 1 and 2 above.
- step S1104 in FIG. 11 does not prohibit overlapping the print permitting pixels of different planes of the same color when arranging the print permitting pixels. That is, when trying to arrange at the position where the energy is the lowest, it is arranged even if it overlaps with the recordable pixel of another plane of the same color at that position. This As a result, a mask with a recording rate of 150% can be generated by superposing two masks, exceeding the recording rate of 100%.
- the present invention can also be applied to a so-called cluster mask in which m ⁇ n recording allowable pixels are used as one unit.
- FIG. 85 is a view for explaining the concept of a 100% uniform mask with a cluster size of 1 ⁇ 2 for 2-pass printing.
- P0001 indicates a recording head of one color among C, M, and Y, and here, it is shown as having eight nozzles for simplification of illustration.
- the nozzles are divided into two groups, 1st and 2nd, and each nozzle group contains 4 nozzles.
- ⁇ 0002 ⁇ and ⁇ 0002 ⁇ indicate mask patterns corresponding to the nozzle rows of the first and second groups, respectively. That is, the mask pattern used in the first scan is “0002” (the lower pattern in the figure) and the mask pattern used in the second scan is “0002” (the upper pattern in the figure). Each of these becomes a mask of one plane.
- each mask pattern 1 X 2 size cluster recording allowable pixels are shown in black, and I X 2 size cluster non-recording allowable pixels are shown in white.
- the first scanning mask pattern ⁇ 0002 ⁇ and the second scanning mask pattern ⁇ 0002 ⁇ are patterns with a recording rate of 50%. Therefore, when these are overlaid, the cluster recording-permissible pixel becomes a 100% pattern for a 4 ⁇ 4 area.
- ⁇ 0003 and ⁇ 0004 are images that are completed by two-pass printing.
- the arrangement is shown in units of two dots. Note that this image is a so-called solid image in which dots are formed in all the pixels for the sake of easy explanation. Therefore, the arrangement of the print allowable pixels of the mask ⁇ 0002 used for generating the dot print data is The dot arrangement is reflected as it is.
- the first scan the first group of dot recording data is generated using the mask pattern ⁇ 00 02 ⁇ .
- an image in which 50% of all pixels are filled is formed.
- the recording medium is conveyed upward in the drawing by the width of the nozzle group.
- the first group of dots for the area shifted by the carry amount is used.
- the second print data is generated using the mask pattern P002A, and the second group of dot print data for the area recorded by the first group is generated using the mask pattern PO002B. These two scanning scans complete the image. At this time, if the completed image is a solid image, an image in which 100% of all pixels are filled with IX two unit dots is formed.
- the four-pass mode shown in the second embodiment can be combined with the third embodiment, the fourth embodiment, and the fifth embodiment, respectively, and the gradation shown in the third embodiment is also possible.
- a combination of these aspects with Embodiments 4 and 5 is also possible.
- the combination of Embodiment 4 and Embodiment 5 is also possible, and these combinations can be implemented from the description of each embodiment.
- Ink types applicable in the present invention are not limited to the ink types described in the above embodiments.
- light ink (light cyan ink, light magenta ink) having a lower density than the basic color of CMY, and special color inks such as red, blue, and green can be further added.
- the laminated mask described in the above embodiment may be applied to all of the plurality of types of ink used in the recording apparatus, or a part of the plurality of types of ink used in the recording apparatus. For these combinations, a laminated mask may be applied.
- a stacking mask may be applied to combinations of some of these six colors (two colors, three colors, four colors, and five colors).
- two forms are possible.
- the first form is the above This is a form in which laminated masks are generated for some colors, and mask manufacturing methods for other colors are not required.
- CMY complementary metal-oxide-semiconductor
- KLcLm the other three colors
- a stacking mask is generated for the above-mentioned part of the color, and the other selected colors are assigned to the selected one of the stacking masks generated for the above-mentioned part of the color. It is. For example, for 3 colors of CMY out of 6 colors, a laminated mask is generated by the manufacturing method described in the above embodiment, and for the other 3 colors (KLcLm)! /, For CMY If it is a laminated mask, the selected one is applied.
- the laminated mask is applied to a combination of different ink colors.
- the present invention is not limited to this embodiment.
- the present invention can also be applied to a mode in which printing is performed using dots of the same color and different diameters (same color inks having different ejection volumes).
- the above-described laminated mask may be applied to dots having the same color and different diameters (for example, large dots and small dots). For example, consider the case of using six types of dots: large cyan, small cyan, large magenta, small magenta, yellow, and black.
- a laminated mask is generated by the manufacturing method described in the above embodiment for large cyan and small cyan, or large magenta and small magenta.
- the above-described stacked mask is applied to the combination of different color dots, and the combination of the same color dots having different diameters is used.
- the form which applies the same mask may be sufficient.
- a laminated mask is generated by the manufacturing method described in the above embodiment, and for the small cyan, the same mask as the large cyan is used.
- the same mask as large magenta is applied to small magenta.
- the number of types of dots having the same color and different diameters is not limited to two types, large, medium, and small, but may be more.
- the present invention is not effective only when applied to dots having at least one of different colors and sizes. For example, separated nozzle group forces are ejected at different timings. Even if it is applied to color inks, it is effective.
- nozzle groups are arranged in the order of CMYMC along the main scanning direction of the head! In this form, the same color nozzle groups (C nozzle group, M nozzle group) are manufactured by the above manufacturing method. The laminated mask is applied.
- the present invention is also applicable to a form using a liquid other than ink.
- the liquid other than the ink include a reaction liquid that aggregates or insolubilizes the color material in the ink.
- at least one kind of ink and a reaction liquid are generated by the manufacturing method described in the above embodiment.
- the present invention can be applied to any deviation of a dye ink containing a dye as a color material, a pigment ink containing a pigment as a color material, and a mixed ink containing a dye and a pigment as a color material. It is.
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Abstract
Description
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Priority Applications (6)
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EP05765535A EP1764221B1 (en) | 2004-07-06 | 2005-07-06 | Data processing method, data processing apparatus and mask generation method |
AT05765535T ATE536594T1 (de) | 2004-07-06 | 2005-07-06 | Datenverarbeitungsverfahren, datenverarbeitungsvorrichtung,verfahren zur produktion einer maske und masken-muster |
US11/566,855 US7614713B2 (en) | 2004-07-06 | 2006-12-05 | Data processing method, data processing apparatus, mask generation method, and mask pattern |
US12/133,928 US7887152B2 (en) | 2004-07-06 | 2008-06-05 | Data processing method, data processing apparatus, mask generation method, and mask pattern |
US12/975,955 US8157343B2 (en) | 2004-07-06 | 2010-12-22 | Data processing method, data processing apparatus, mask generation method, and mask pattern |
US13/293,809 USRE45358E1 (en) | 2004-07-06 | 2011-11-10 | Data processing method, data processing apparatus, mask generation method, and mask pattern |
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JP2008207385A (ja) * | 2007-02-23 | 2008-09-11 | Canon Inc | データ処理方法、データ処理装置およびデータ記録方法 |
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US20070097164A1 (en) | 2007-05-03 |
US8157343B2 (en) | 2012-04-17 |
EP2202674A1 (en) | 2010-06-30 |
US20110090518A1 (en) | 2011-04-21 |
US7614713B2 (en) | 2009-11-10 |
RU2006143050A (ru) | 2008-06-10 |
ATE536594T1 (de) | 2011-12-15 |
EP2202674B1 (en) | 2014-09-10 |
JP2006044258A (ja) | 2006-02-16 |
USRE45358E1 (en) | 2015-02-03 |
US7887152B2 (en) | 2011-02-15 |
RU2337009C2 (ru) | 2008-10-27 |
EP1764221A1 (en) | 2007-03-21 |
US20080239337A1 (en) | 2008-10-02 |
EP1764221A4 (en) | 2009-05-27 |
EP2202673A1 (en) | 2010-06-30 |
JP4280732B2 (ja) | 2009-06-17 |
ATE549695T1 (de) | 2012-03-15 |
EP1764221B1 (en) | 2011-12-07 |
EP2202673B1 (en) | 2012-03-14 |
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