JP2016048905A5 - - Google Patents

Description

The input color conversion table defines a multidimensional correspondence between the third color space and the second color space, and the output color conversion table is suitable for supply to the second color space and the printing apparatus. It defines a multidimensional correspondence with a color space (a third color space that is a device-dependent color space). According to the second aspect, by correcting the input color conversion table or the output color conversion table on the basis of the difference between the chromaticity value of the target printed material and the chromaticity value of the printed material, the corrected multidimensional color conversion table is obtained. Can be obtained.

For example, the input color conversion table selecting unit calculates the chromaticity value read for the originals the image signal, a color difference between the chromaticity values defined in the input color conversion table stored in the input color conversion table database The input color conversion table having the smallest color difference average value (referred to as “average color difference”) or maximum color difference value (referred to as “maximum color difference”) may be selected.

As a fifth aspect, in the color conversion table creation device according to any one of the first aspect to the fourth aspect, a first color conversion in which a plurality of color conversion tables applicable as the first color conversion table are stored A plurality of color conversion tables, comprising: a table database; and a first color conversion table selection unit that selects one color conversion table from a plurality of color conversion tables stored in the first color conversion table database. Can be configured to include a color conversion table that indicates the correspondence between the read signal of the image reading unit and the chromaticity value for each combination of the color material type and the base material type used for creating the printed matter by the printing apparatus.
As a sixth aspect, in the color conversion table creation device according to any one of the first aspect to the fourth aspect, at least one of a target printed matter, a printed matter, and a color sample different from the target printed matter and the printed matter. A colorimetric unit that obtains the colorimetric value of the colorimetric object by performing colorimetry on one of the colorimetric objects, and an original image signal corresponding to the position on the original image data from which the colorimetric value is obtained by the colorimetric part At least one of a colorimetric target document image signal acquisition unit that acquires a color measurement target read image signal acquisition unit that acquires a read image signal corresponding to a position on read image data from which a colorimetric value is acquired by the colorimetry unit And a colorimetric object image signal acquisition unit including two of them.

It is desirable to use a spectrocolorimeter as the color measurement unit. According to the sixth aspect, it is possible to reduce the error of the chromaticity value grasped from the image read by the image reading unit and further improve the color matching accuracy.

As a seventh aspect, the position of the document image data in which the color measurement value is obtained by the color measurement unit with respect to the result of the color conversion by the first color conversion unit in the color conversion table creation device described in the sixth aspect The chromaticity value replacement unit that replaces the chromaticity value corresponding to 1 with the colorimetric value acquired by the colorimetry unit may be provided.

As an eighth aspect, in the color conversion table creation device according to the sixth aspect or the seventh aspect, a first color conversion table database storing a plurality of color conversion tables applicable as the first color conversion table; A first color conversion table selection unit that selects one color conversion table from a plurality of color conversion tables stored in one color conversion table database, and the plurality of color conversion tables are determined by a printing apparatus. Including a color conversion table that represents the correspondence between the read signal of the image reading unit and the chromaticity value for each combination of the color material type and the base material type used for creating the printed matter, and the first color conversion table selection unit One of a plurality of color conversion tables is selected based on the correspondence between the read image signal corresponding to the position on the read image data from which the color measurement value has been acquired by the color portion and the color measurement value acquired by the color measurement portion. color It may be configured to perform processing for selecting a conversion table.

According to the eighth aspect, it is possible to further improve the accuracy of the chromaticity value obtained from the image read by the image reading unit.

As a ninth aspect, in the color conversion table creation device according to any one of the sixth aspect to the eighth aspect, a read image signal corresponding to the position on the read image data from which the colorimetric value is acquired by the colorimetric unit; The first color conversion table correction unit that corrects the first color conversion table based on the correspondence relationship with the color measurement values acquired by the color measurement unit may be provided.

According to the ninth aspect, the chromaticity value acquired via the image reading unit can be brought close to the colorimetric value obtained from the colorimetric unit, and the accuracy of the chromaticity value can be increased.

As a tenth aspect, in the color conversion table creation device according to any one of the first aspect to the ninth aspect, document image data and an image represented by signal values of a third color space that is a device-dependent color space Based on the correspondence relationship between the chromaticity values of the read image of the target printed matter obtained through the processing by the associating unit and the first color converting unit, the third color space and the second color space of the document image data A second color conversion table creating unit that creates a second color conversion table representing a multidimensional correspondence relationship, and the second color conversion table created by the second color conversion table creating unit It can be configured to be used as an input color conversion table of the conversion unit.

According to the tenth aspect, the accuracy of color reproduction in the first printing is improved, and the convergence of color matching is accelerated.

As an eleventh aspect, in the color conversion table creation device according to any one of the first aspect to the tenth aspect, the image association unit extracts a partial image corresponding to the document image data from the read image data It can be set as the structure which has the image extraction part which performs.

According to the eleventh aspect, even when the original image data and the target printed material or the image content of the printed surface of the printed material do not correspond one-to-one, the target color matching can be performed.

As a twelfth aspect, in the color conversion table creation device according to any one of the first aspect to the eleventh aspect, the image association unit is configured to store the document image data and the read image data subjected to the process of associating the positional relationship. From each, it can be set as the structure which performs the color extraction process which extracts the corresponding color information.

As a thirteenth aspect, in the color conversion table creation device according to the twelfth aspect, the color extraction processing includes processing for setting a region of interest in document image data and processing for determining whether the region of interest satisfies the first extraction condition. And extracting the signal value of the document image data as color information from the region of interest that satisfies the first extraction condition, and satisfying the first extraction condition in the read image data that has been subjected to the process of associating the positional relationship. A corresponding color information extraction process for extracting a signal value of read image data as color information from a region at a position corresponding to the region of interest.

As a fourteenth aspect, in the color conversion table creation device according to the thirteenth aspect, the first extraction condition is that a color difference within the region of interest is equal to or less than a first extraction threshold value defined as an allowable range. It can be set as the structure containing these conditions.

As a fifteenth aspect, in the color conversion table creation device according to the thirteenth aspect or the fourteenth aspect, the color extraction process includes a process of determining whether or not the region of interest satisfies the second extraction condition. As processing, processing was performed for extracting the signal value of the document image data as color information from the region of interest satisfying the first extraction condition and satisfying the second extraction condition, and associating the positional relationship with each other. A configuration including a process of extracting a signal value of read image data as color information from a region at a position corresponding to a target region that satisfies the first extraction condition and the second extraction condition in the read image data can be employed.

As a sixteenth aspect, in the color conversion table creation device according to the fifteenth aspect, the second extraction condition is that the read image data exists in a region corresponding to the region of interest that satisfies the first extraction condition, and A configuration including a condition that an image defect does not exist in the region of the read image data at a position corresponding to the region of interest that satisfies the first extraction condition can be employed.

As a seventeenth aspect, in the color conversion table creation device according to any one of the thirteenth to sixteenth aspects, the color extraction process includes a process of determining whether the region of interest satisfies the third extraction condition, As the correspondence color information extraction processing, the signal value of the document image data as color information is extracted from the region of interest that satisfies the first extraction condition and satisfies the third extraction condition, and associates the positional relationship with each other. A process of extracting a signal value of the read image data as color information from an area at a position corresponding to the target area that satisfies the first extraction condition in the read image data that has been processed is performed. As a third extraction condition, It can be set as the structure by which any one condition of being a non-surface process area | region without surface processing or being a surface process area | region with surface processing is defined.

As an eighteenth aspect, in the color conversion table creation device according to any one of the first aspect to the eleventh aspect, the image associating unit includes the original image data and the second color space on which the positional relationship is associated. A color extraction process for extracting corresponding color information from each of the read chromaticity value image data represented by chromaticity values can be performed.

As a nineteenth aspect, in the color conversion table creating apparatus according to the eighteenth aspect, the color extraction processing includes processing for setting a region of interest in document image data and processing for determining whether the region of interest satisfies the first extraction condition. The first extraction in the read chromaticity value image data in which the signal value of the document image data as color information is extracted from the region of interest that satisfies the first extraction condition and the positional relationship is associated. And a corresponding color information extraction process for extracting the chromaticity value of the read chromaticity value image data as the color information from the area corresponding to the target area that satisfies the condition.

As a twentieth aspect, in the color conversion table creation device according to the nineteenth aspect, the first extraction condition is that a color difference within the region of interest is equal to or less than a first extraction threshold value defined as an allowable range. It can be set as the structure containing these conditions.

As a twenty-first aspect, in the color conversion table creating device of the nineteenth aspect or twentieth aspect, the color extraction process includes a process region of interest to determine whether the second extraction condition is satisfied, the corresponding relationship color information extraction As processing, processing was performed for extracting the signal value of the document image data as color information from the region of interest satisfying the first extraction condition and satisfying the second extraction condition, and associating the positional relationship with each other. A configuration including processing for extracting the chromaticity value of the read chromaticity value image data as color information from a region at a position corresponding to the target region that satisfies the first extraction condition and the second extraction condition in the read chromaticity value image data It can be.

As a 22nd aspect, in the color conversion table creating device 21 embodiment, the second extraction condition, that the image data read to the position in the region corresponding to the first extraction satisfying the target region is present, and, A configuration including a condition that an image defect does not exist in the region of the read image data at a position corresponding to the region of interest that satisfies the first extraction condition can be employed.

As a twenty- third aspect, in the color conversion table creation device according to any one of the nineteenth aspect to the twenty-second aspect, the color extraction process includes a process of determining whether the region of interest satisfies the third extraction condition, As the correspondence color information extraction processing, the signal value of the document image data as color information is extracted from the region of interest that satisfies the first extraction condition and satisfies the third extraction condition, and associates the positional relationship with each other. Extracts the chromaticity value of the read chromaticity value image data as color information from the region corresponding to the region of interest that satisfies the first extraction condition and the third extraction condition in the read chromaticity value image data that has been processed. The processing is performed, and as the third extraction condition, either a non-surface processed region without surface processing or a surface processed region with surface processing is determined. This Can.

As a twenty-fourth aspect, in the color conversion table creation device according to any one of the first aspect to the twenty- third aspect, a first image reading unit that reads a target printed matter and a printed matter that is printed by the printing device are used as an image reading unit. It can be set as the structure provided with the 2nd image reading part to read.

A color conversion table creation method according to a twenty-fifth aspect includes an original image color conversion step for converting original image data into print image data using an input color conversion table and an output color conversion table, and a printing apparatus according to the print image data. A printing process for printing a printed material, a step for reading the printed material by an image reading unit to obtain printed material read image data representing a read image of the printed material, and a target printed material for reading the target printed material by the image reading unit and representing a read image of the target printed material A first color representing a correspondence relationship between the step of obtaining read image data, and the signal value of the first color space obtained from the image reading unit and the chromaticity value of the second color space which is a device-independent color space Using the conversion table, the read image color conversion step for converting the signal value of the first color space into the chromaticity value of the second color space, and the printed material is read by the image reading unit. The process of associating the positional relationship between the printed material read image data and the document image data represented by the signal value of the first color space obtained in step 1 and the signal of the first color space obtained by reading the target printed material with the image reading unit The signal value of the printed material read image data in the second color space is obtained by an image associating process for performing a process of associating the positional relationship between the target printed material read image data represented by the value and the document image data, The signal value of the target printed matter read image data is converted into the color of the second color space by the process of associating the positional relationship between the printed matter read chromaticity value image data obtained by converting the chromaticity value and the original image data and the read image color conversion step. An image associating process for associating the positional relationship between the target printed material read chromaticity value image data and the original image data obtained by conversion into a degree value, and a device-dependent color space The correspondence relationship between the original image data represented by the signal value of the third color space and the chromaticity value of the target printed matter and the chromaticity value of the printed matter obtained through the processing in the image matching step and the read image color conversion step And a color conversion table creating step for creating a color conversion table used for color conversion in the original image color conversion step based on the difference between the chromaticity value of the target printed matter and the chromaticity value of the printed matter.

In the color conversion table creation method of the 25th aspect, the same matters as the specific matters of the color conversion table creation device specified in the 2nd to 24th aspects can be appropriately combined. In that case, the processing unit and the functional unit as the means for performing the processing and function specified in the color conversion table creating apparatus can be grasped as the elements of the “process (step)” of the corresponding processing and operation.

As a twenty-sixth aspect, in the color conversion table creation method according to the twenty-fifth aspect, the color conversion table created in the color conversion table creation process is used for color conversion in the document image color conversion process, A printing process, a process of obtaining printed material read image data, a read image color conversion process, an image association process, and a color conversion table creation process can be repeated.

A program according to a twenty-seventh aspect is obtained from an image reading unit, a function of acquiring read image data representing each read image of a target printed material and a printed material from an image reading unit that reads the target printed material and the printed material printed by the printing apparatus. Signal value of the first color space using the first color conversion table representing the correspondence between the signal value of the first color space and the chromaticity value of the second color space which is a device-independent color space A first color conversion function for converting image data into chromaticity values of a second color space, and a second color conversion function for color conversion of document image data to print image data using an input color conversion table and an output color conversion table And the positional relationship between the printed material read image data represented by the signal value of the first color space obtained by reading the printed material printed by the printing device according to the print image data with the image reading unit and the document image data. An image association function for performing a process of associating and a process of associating the positional relationship between the target printed matter read image data represented by the signal value of the first color space obtained by reading the target printed matter with the image reading unit and the document image data, Alternatively, a process of associating the positional relationship between the printed material read chromaticity value image data obtained by converting the signal value of the printed material read image data into the chromaticity value of the second color space and the document image data by the first color conversion function. And the positional relationship between the target printed matter read chromaticity value image data obtained by converting the signal value of the target printed matter read image data into the chromaticity value of the second color space and the original image data by the first color conversion function. Processing by an image association function for processing, document image data represented by signal values of a third color space that is a device-dependent color space, an image association function, and a first color conversion function Color conversion used for the second color conversion function based on the difference between the chromaticity value of the target printed matter and the chromaticity value of the printed matter from the correspondence relationship between the chromaticity value of the target printed matter and the chromaticity value of the printed matter obtained through This is a program that causes a computer to realize a color conversion table creation function for creating a table.

Regarding the program of the twenty-seventh aspect, the same matters as the specific matters of the color conversion table creation device specified in the second to twenty-fourth aspects can be appropriately combined. In this case, the processing unit or function unit as a means for performing the processing or function specified in the color conversion table creating apparatus can be grasped as an element of the “function” of the program that performs the corresponding processing or operation.

A color conversion table creation device according to a twenty-eighth aspect includes a first image reading unit that reads a target printed matter and obtains read image data representing a read image of the target printed matter, and reads the printed matter printed by the printing device. A second image reading unit that acquires read image data representing a read image, a signal value of the first color space obtained from each of the first image reading unit and the second image reading unit, and a device-independent color space A first color conversion table representing a correspondence relationship with the chromaticity value of the second color space is used to convert the signal value of the first color space into the chromaticity value of the second color space. A color conversion unit, a second color conversion unit that converts document image data into print image data using the input color conversion table and the output color conversion table, and a printed matter printed by the printing apparatus according to the print image data. Second image reading unit A process for associating the positional relationship between the printed material read image data represented by the signal value of the first color space obtained by reading and the document image data and the first printed image obtained by reading the target printed material by the first image reading unit. The signal value of the printed material read image data is processed by the image associating unit that performs processing for associating the positional relationship between the target printed material read image data and the document image data represented by the signal value of the color space. The process of associating the positional relationship between the printed material reading chromaticity value image data obtained by converting the chromaticity value of the second color space and the document image data, and the signal value of the target printed material reading image data by the first color conversion unit. An image association unit that performs processing for associating the positional relationship between the target printed material read chromaticity value image data obtained by conversion into the chromaticity value of the second color space and the document image data; Document image data represented by signal values in the third color space, which is a color space, the chromaticity value of the target printed matter and the chromaticity value of the printed matter obtained through processing by the image association unit and the first color converting unit A color conversion table that includes a color conversion table creation unit that creates a color conversion table used for the second color conversion unit based on the difference between the chromaticity value of the target print and the chromaticity value of the print Device.

In the color conversion table creation device of the 28th aspect, the same matters as the specific matters of the color conversion table creation device specified in the second aspect to the 23rd aspect can be appropriately combined.

As a 29 aspect, in the color conversion table creating device of the 24th aspect or the 28th aspect, the second image reading unit can be configured as an in-line sensor provided in the printing apparatus.

A color conversion table creation method according to a thirtieth aspect includes a step of reading a target printed matter by a first image reading unit to obtain target printed matter read image data representing a read image of the target printed matter, an input color conversion table, and an output color conversion A document image color conversion step for color-converting document image data to print image data using a table, a printing step for printing a printed matter by a printing device according to the print image data, and a printed matter by reading the printed matter by the second image reading unit A printed material read image data representing the read image of the first color space, a signal value of the first color space obtained from each of the first image reading unit and the second image reading unit, and a device independent color space. Reading that converts the signal value of the first color space into the chromaticity value of the second color space using the first color conversion table that represents the correspondence relationship with the chromaticity values of the second color space Image color conversion step, processing for associating positional relationship between printed image read image data and document image data represented by signal value of first color space obtained by reading printed material by second image reading unit, and target printed material An image associating step for performing a process of associating the positional relationship between the target printed material read image data and the document image data represented by the signal value of the first color space obtained by reading the image data with the first image reading unit, or Processing for associating the positional relationship between the printed material read chromaticity value image data obtained by converting the signal value of the printed material read image data into the chromaticity value of the second color space and the original image data in the read image color conversion step, and the read image The positional relationship between the target printed material read chromaticity value image data and the original image data obtained by converting the signal value of the target printed material read image data into the chromaticity value of the second color space by the color conversion process. The target obtained through the image association process for performing the process of associating, the original image data represented by the signal values of the third color space that is the device-dependent color space, and the processes of the image association process and the read image color conversion process Based on the correspondence between the chromaticity value of the printed material and the chromaticity value of the printed material, a color conversion table used for color conversion in the original image color conversion process is created based on the difference between the chromaticity value of the target printed material and the chromaticity value of the printed material A color conversion table creating method comprising: a color conversion table creating step.

In the color conversion table creation method of the 30th aspect, the same matters as the specific matters of the color conversion table creation device specified in the 2nd to 23rd aspects and the 29th aspect can be appropriately combined. In that case, the processing unit and the functional unit as the means for performing the processing and function specified in the color conversion table creating apparatus can be grasped as the elements of the “process (step)” of the corresponding processing and operation.

A program according to a thirty-first aspect includes a function of acquiring read image data representing a read image of a target print from a first image reading unit that reads the target print, and a second image reading unit that reads the print printed by the printing apparatus A function for acquiring read image data representing a read image of a printed material from the image data, a signal value of the first color space obtained from each of the first image reading unit and the second image reading unit, and a device-independent color space. A first color that converts a signal value of the first color space into a chromaticity value of the second color space using a first color conversion table that represents a correspondence relationship with the chromaticity values of the second color space. A conversion function, a second color conversion function for converting original image data into print image data using the input color conversion table and the output color conversion table, and a second printed matter printed by the printing apparatus in accordance with the print image data. Image reading Obtained by reading the target printed matter with the first image reading unit and processing for associating the positional relationship between the printed matter read image data and the document image data represented by the signal values of the first color space obtained by reading with the first part. An image association function for performing a process of associating a positional relationship between target printed matter read image data and document image data represented by a signal value of the first color space, or a signal of printed matter read image data by the first color conversion function A signal of the target printed matter read image data is obtained by the process of associating the positional relationship between the printed matter reading chromaticity value image data obtained by converting the value into the chromaticity value of the second color space and the original image data and the first color converting function. An image association function for performing a process of associating the positional relationship between the target printed material read chromaticity value image data obtained by converting the value into the chromaticity value of the second color space and the document image data; Document image data represented by signal values in the third color space, which is a device-dependent color space, the chromaticity value of the target printed matter and the chromaticity of the printed matter obtained through processing by the image association function and the first color conversion function A color conversion table creation function that creates a color conversion table used for the second color conversion function based on the difference between the chromaticity value of the target printed matter and the chromaticity value of the printed matter based on the correspondence with the values is realized in a computer It is a program to let you.

Regarding the program of the 31st aspect, the same matters as the specific matters of the color conversion table creation device specified in the 2nd to 23rd aspects and the 29th aspect can be appropriately combined. In this case, the processing unit or function unit as a means for performing the processing or function specified in the color conversion table creating apparatus can be grasped as an element of the “function” of the program that performs the corresponding processing or operation.

The first color conversion unit 64 uses a color conversion table (corresponding to a “first color conversion table”) of the scanner profile 68 to perform color conversion processing (RGB → Lab conversion) from RGB values to Lab values. I do. The scanner profile 68 is a color conversion table (“first color conversion table”) indicating the correspondence between RGB values, which are read image signal values in the device-dependent color space obtained from the image reading unit 30, and device-independent Lab values. )including. Although the Lab color space is used as the device-independent color space here, other device-independent color spaces can also be used. The color space of the read image signal (RGB) obtained from the image reading unit 30 corresponds to the “first color space”, and the device-independent color space exemplified by the Lab color space corresponds to the “second color space”. To do. The function of color conversion by the first color conversion unit 64 corresponds to the “first color conversion function”. Process for color converting an image signal read by the first color conversion section 64 corresponds to the "read image color conversion process".

In the case of a conventional printing system, when creating such a color conversion table, generally, the correspondence between image signal values and chromaticity values regularly arranged in the entire color space is obtained using a color chart. From this correspondence, a color conversion table is created by interpolation using a predetermined interpolation method.

For ID = 2 to 5, because there is no lattice points corresponding directly, with respect to neighboring lattice points set the chromaticity values. As shown in FIG. 11, for ID = 2, 3, and 4, chromaticity values are set at the four surrounding grid points surrounding the document image signal value.

Claims (31)

An image reading unit that reads the target printed matter and the printed matter printed by the printing apparatus and acquires read image data representing the respective read images of the target printed matter and the printed matter;
Using the first color conversion table representing the correspondence between the signal value of the first color space obtained from the image reading unit and the chromaticity value of the second color space which is a device-independent color space, the first color conversion table is used. A first color conversion unit that converts a signal value of one color space into a chromaticity value of the second color space;
A second color conversion unit that converts document image data to print image data using the input color conversion table and the output color conversion table;
The printed material read image data represented by the signal value of the first color space obtained by reading the printed material printed by the printing device according to the print image data by the image reading unit, and the original image data. A process for associating a positional relationship and a process for associating the positional relationship between the target printed matter read image data represented by the signal value of the first color space obtained by reading the target printed matter with the image reading unit and the original image data Printed matter read chromaticity value image data obtained by converting the signal value of the printed matter read image data into the chromaticity value of the second color space by the image association unit or the first color conversion unit The process of associating the positional relationship with the document image data and the signal value of the target printed matter read image data by the first color conversion unit are converted into the color of the second color space. An image correlating unit that performs processing for associating the positional relationship between the target print reading chromaticity value image data obtained by converting the value to the original image data,
The original image data represented by the signal value of the third color space which is a device-dependent color space, and the chromaticity value of the target printed matter obtained through the processing by the image association unit and the first color conversion unit, A color conversion table for creating a color conversion table for use in the second color conversion unit based on the difference between the chromaticity value of the target printed material and the chromaticity value of the printed material from the correspondence relationship with the chromaticity value of the printed material The creation department;
A color conversion table creation device comprising:   The color conversion table creation unit corrects the input color conversion table or the output color conversion table based on the correspondence relationship between the original image data, the chromaticity value of the target printed material, and the chromaticity value of the printed material. The color conversion table creation device according to claim 1, wherein a color conversion table used for the second color conversion unit is created.   The color conversion table creation unit creates a color correction table for correcting an output value of the input color conversion table based on a correspondence relationship between the original image data, the chromaticity value of the target printed matter, and the chromaticity value of the printed matter. The color conversion table creation device according to claim 1 or 2. An input color conversion table database in which a plurality of input color conversion tables having different color reproduction characteristics are stored;
Based on the correspondence relationship between the original image data and the chromaticity value of the target printed matter from among the plurality of input color conversion tables stored in the input color conversion table database, the second color conversion unit An input color conversion table selection unit for performing processing for selecting one input color conversion table to be applied;
The color conversion table creation device according to any one of claims 1 to 3. A first color conversion table database storing a plurality of color conversion tables applicable as the first color conversion table;
  A first color conversion table selection unit that selects one color conversion table from the plurality of color conversion tables stored in the first color conversion table database;
  With
  The plurality of color conversion tables include a color conversion table representing a correspondence relationship between a read signal of the image reading unit and a chromaticity value for each combination of a color material type and a base material type used for creating a printed matter by a printing apparatus. The color conversion table creation apparatus according to claim 1. The colorimetric value of the colorimetric object is obtained by performing colorimetry on at least one of the target printed material, the printed material, and the color sample different from the target printed material and the printed material. A colorimetric unit to perform,
The colorimetric target document image signal acquisition unit that acquires a document image signal corresponding to the position on the document image data from which the colorimetric value is acquired by the colorimetric unit, and the reading that has acquired the colorimetric value by the colorimetry unit A colorimetric target image signal acquisition unit including at least one of the colorimetric target read image signal acquisition unit for acquiring a read image signal corresponding to a position on the image data;
The color conversion table creation device according to claim 1, comprising: The colorimetric value acquired by the colorimetric unit is a chromaticity value corresponding to the position of the original image data from which the colorimetric value is acquired by the colorimetric unit with respect to the color conversion result by the first color conversion unit The color conversion table creation apparatus according to claim 6 , further comprising a chromaticity value replacement unit that replaces with a value. A first color conversion table database storing a plurality of color conversion tables applicable as the first color conversion table;
A first color conversion table selection unit that selects one color conversion table from the plurality of color conversion tables stored in the first color conversion table database;
With
The plurality of color conversion tables include a color conversion table representing a correspondence relationship between a read signal of the image reading unit and a chromaticity value for each combination of a color material type and a base material type used for creating a printed matter by a printing apparatus. ,
The first color conversion table selection unit corresponds to a read image signal corresponding to a position on the read image data from which the color measurement value is acquired by the color measurement unit and a color measurement value acquired by the color measurement unit. The color conversion table creation device according to claim 6 or 7 , wherein a process of selecting one color conversion table from the plurality of color conversion tables is performed based on the relationship. The first color conversion based on a correspondence relationship between the read image signal corresponding to the position on the read image data from which the colorimetric value is acquired by the colorimetric unit and the colorimetric value acquired by the colorimetric unit. color conversion table generating apparatus according to any one of claims 6 to 8 comprising a first color conversion table correction unit that corrects the table. The color of the read image of the target printed matter obtained through the processing by the original image data represented by the signal value of the third color space which is a device-dependent color space, the image association unit, and the first color conversion unit A second color for generating a second color conversion table representing a multidimensional correspondence between the third color space and the second color space of the document image data based on the correspondence with the degree value; It has a conversion table creation unit,
The color according to any one of claims 1 to 9 , wherein the second color conversion table created by the second color conversion table creation unit is used as an input color conversion table of the second color conversion unit. Conversion table creation device. The image correlating unit creates a color conversion table according to any one of claims 1 to 10 having an image extraction unit that performs processing for extracting a partial image corresponding to the original image data from among the read image data apparatus. The image correlating unit from each of the original image data and the read image data processing is performed for associating the positional relationship, any one of claims 1 to perform color extraction process of extracting the corresponding color information 11 The color conversion table creation device according to Item 1. The color extraction process includes
Processing for setting a region of interest in the document image data;
A process for determining whether the region of interest satisfies a first extraction condition;
A signal value of the original image data as the color information is extracted from the region of interest satisfying the first extraction condition, and the first image in the read image data subjected to the process of associating the positional relationship is used. 13. A color conversion table creation according to claim 12 , further comprising: correspondence color information extraction processing for extracting a signal value of the read image data as the color information from a region at a position corresponding to the target region that satisfies the extraction condition of apparatus. Before SL first extraction conditions, the difference in color in the noted region is, the color conversion table according to claim 13 or less first extraction threshold defined as the allowable range, including a condition that Creation device. The color extraction process includes a process of determining whether or not the region of interest satisfies a second extraction condition;
As the correspondence color information extraction process, a signal value of the document image data as the color information is extracted from the region of interest that satisfies the first extraction condition and satisfies the second extraction condition, In addition, the read image as the color information from the region of the position corresponding to the region of interest that satisfies the first extraction condition and the second extraction condition in the read image data subjected to the process of associating the positional relationship. color conversion table creating device according to claim 13 or 14 comprising a process for extracting a signal value of the data. The second extraction condition is that the read image data exists in a region corresponding to the region of interest satisfying the first extraction condition, and the region of interest satisfies the first extraction condition. The color conversion table creating apparatus according to claim 15 , further comprising a condition that an image defect does not exist in an area of the read image data at a corresponding position. The color extraction process includes a process of determining whether or not the region of interest satisfies a third extraction condition;
As the correspondence color information extraction process, a signal value of the document image data as the color information is extracted from the region of interest that satisfies the first extraction condition and satisfies the third extraction condition, In addition, a signal value of the read image data as the color information is extracted from a region at a position corresponding to the region of interest that satisfies the first extraction condition in the read image data subjected to the process of associating the positional relationship. Processing takes place,
As the third extraction condition, that the surface processing is not non-surface processed region, or one that is surface processed region where the surface processing is present, claim 13 in which one of the conditions either is determined 16 The color conversion table creation device according to Item 1. The image association unit corresponds to color information corresponding to each of the original image data subjected to the process of associating the positional relationship and the read chromaticity value image data represented by chromaticity values of the second color space. color conversion table generating apparatus according to any one of claims 1 to 11 for the color extracting process of extracting. The color extraction process includes
Processing for setting a region of interest in the document image data;
A process for determining whether the region of interest satisfies a first extraction condition;
In the read chromaticity value image data in which the signal value of the original image data as the color information is extracted from the region of interest that satisfies the first extraction condition and the positional relationship is associated. 18. including a correspondence color information extraction process for extracting a chroma value of the reading chromaticity value image data as the color information from the area corresponding to the first extraction satisfying the region of interest The color conversion table creation device described in 1. The color conversion table creation according to claim 19 , wherein the first extraction condition includes a condition that a color difference within the region of interest is equal to or less than a first extraction threshold value defined as an allowable range. apparatus. The color extraction process includes a process of determining whether or not the region of interest satisfies a second extraction condition;
As the correspondence color information extraction process, a signal value of the document image data as the color information is extracted from the region of interest that satisfies the first extraction condition and satisfies the second extraction condition, In addition, as the color information from the region of the position corresponding to the region of interest that satisfies the first extraction condition and the second extraction condition in the read chromaticity value image data subjected to the process of associating the positional relationship. color conversion table creating device according to claim 19 or 20 comprising a process of extracting a chroma value of the reading chromaticity value image data. The second extraction condition is that the read image data exists in a region corresponding to the region of interest satisfying the first extraction condition, and the region of interest satisfies the first extraction condition. The color conversion table creation device according to claim 21 , including a condition that an image defect does not exist in an area of the read image data at a corresponding position. The color extraction process includes a process of determining whether or not the region of interest satisfies a third extraction condition;
As the correspondence color information extraction process, a signal value of the document image data as the color information is extracted from the region of interest that satisfies the first extraction condition and satisfies the third extraction condition, In addition, the color information from the region corresponding to the region of interest that satisfies the first extraction condition and the third extraction condition in the read chromaticity value image data that has undergone the process of associating the positional relationship is used as the color information. A process of extracting a chromaticity value of the read chromaticity value image data is performed,
The condition according to any one of claims 19 to 21 , wherein any one of a non-surface processed region without surface processing or a surface processed region with surface processing is defined as the third extraction condition. The color conversion table creation device according to Item 1. As the image reading unit, a first image reading unit for reading the target printed material, or a second image reading unit and from which claim 1 comprising 23 to read the printed matter printed by the printing device 1 The color conversion table creation device described in the item. An original image color conversion step for converting original image data into print image data using an input color conversion table and an output color conversion table;
A printing step of printing a printed matter by a printing device according to the print image data;
Reading the printed matter by an image reading unit to obtain printed matter read image data representing a read image of the printed matter;
Reading target printed matter by the image reading unit to obtain target printed matter read image data representing a read image of the target printed matter;
Using the first color conversion table representing the correspondence between the signal value of the first color space obtained from the image reading unit and the chromaticity value of the second color space which is a device-independent color space, the first color conversion table is used. A read image color conversion step of converting a signal value of one color space into a chromaticity value of the second color space;
A process for associating a positional relationship between the printed image read image data represented by the signal value of the first color space obtained by reading the printed material with the image reading unit and the original image data, and the target printed material. An image associating step for performing a process of associating a positional relationship between the target printed material read image data represented by the signal value of the first color space obtained by reading by the reading unit and the document image data, or the reading A process for associating the positional relationship between the printed material read chromaticity value image data obtained by converting the signal value of the printed material read image data into the chromaticity value of the second color space and the original image data by an image color conversion step; Target printed matter read chromaticity obtained by converting the signal value of the target printed matter read image data into the chromaticity value of the second color space in the read image color conversion step. An image correlating step of performing processing for associating the positional relationship between the image data and the original image data,
The original image data represented by the signal value of the third color space which is a device-dependent color space, the chromaticity value of the target printed matter obtained through the processing in the image association step and the read image color conversion step, and the Color conversion for creating a color conversion table used for color conversion in the original image color conversion step based on the difference between the chromaticity value of the target printed material and the chromaticity value of the printed material from the correspondence relationship with the chromaticity value of the printed material Table creation process;
A color conversion table creation method comprising: Using the color conversion table created in the color conversion table creation step for color conversion in the document image color conversion step, again obtaining the document image color conversion step, the printing step, and obtaining the printed material read image data; The color conversion table creation method according to claim 25 , wherein a read image color conversion step, the image association step, and the color conversion table creation step are repeated. A function of acquiring read image data representing each read image of the target printed material and the printed material from an image reading unit that reads the target printed material and the printed material printed by the printing apparatus;
Using the first color conversion table representing the correspondence between the signal value of the first color space obtained from the image reading unit and the chromaticity value of the second color space which is a device-independent color space, the first color conversion table is used. A first color conversion function for converting a signal value of one color space into a chromaticity value of the second color space;
A second color conversion function for converting document image data into print image data using the input color conversion table and the output color conversion table;
The printed material read image data represented by the signal value of the first color space obtained by reading the printed material printed by the printing device according to the print image data by the image reading unit, and the original image data. A process for associating a positional relationship and a process for associating the positional relationship between the target printed matter read image data represented by the signal value of the first color space obtained by reading the target printed matter with the image reading unit and the original image data Printed matter read chromaticity value image data obtained by converting the signal value of the printed matter read image data into chromaticity values of the second color space by the first color conversion function The signal value of the target printed matter read image data is converted into the second color space by the process of associating the positional relationship with the document image data and the first color conversion function. And an image correspondence function of performing processing for associating the positional relationship between the target print reading chromaticity value image data obtained the original image data is converted into chromaticity values,
The original image data represented by the signal value of the third color space which is a device-dependent color space, and the chromaticity value of the target printed matter obtained through the processing by the image association function and the first color conversion function, A color conversion table for creating a color conversion table used for the second color conversion function based on the difference between the chromaticity value of the target printed material and the chromaticity value of the printed material from the correspondence relationship with the chromaticity value of the printed material Create function,
A program that makes a computer realize. A first image reading unit that reads a target printed matter and obtains read image data representing a read image of the target printed matter;
A second image reading unit that reads a printed matter printed by a printing apparatus and obtains read image data representing a read image of the printed matter;
A correspondence relationship between the signal value of the first color space obtained from each of the first image reading unit and the second image reading unit and the chromaticity value of the second color space which is a device-independent color space. A first color conversion unit that converts a signal value of the first color space into a chromaticity value of the second color space using a first color conversion table that represents
A second color conversion unit that converts document image data to print image data using the input color conversion table and the output color conversion table;
Printed material read image data represented by signal values of the first color space obtained by reading the printed material printed by the printing apparatus according to the print image data with the second image reading unit, and the original image A process for associating a positional relationship with data, and a target printed matter read image data represented by a signal value of the first color space obtained by reading the target printed matter by the first image reading unit; An image association unit that performs a process of associating the positional relationship of the printed matter, or a printed matter reading obtained by converting a signal value of the printed matter read image data into a chromaticity value of the second color space by the first color conversion unit. The process of associating the positional relationship between the chromaticity value image data and the original image data and the signal value of the target printed material read image data by the first color conversion unit An image correlating unit that performs processing for associating the positional relationship between the target print reading chromaticity value image data obtained by converting the chromaticity values of the color space and the original image data,
The original image data represented by the signal value of the third color space which is a device-dependent color space, and the chromaticity value of the target printed matter obtained through the processing by the image association unit and the first color conversion unit, A color conversion table for creating a color conversion table for use in the second color conversion unit based on the difference between the chromaticity value of the target printed material and the chromaticity value of the printed material from the correspondence relationship with the chromaticity value of the printed material The creation department;
A color conversion table creation device comprising: The color conversion table creation device according to claim 24 or 28 , wherein the second image reading unit is an in-line sensor built in the printing device. Reading the target printed matter by the first image reading unit to obtain target printed matter read image data representing the read image of the target printed matter;
An original image color conversion step for converting original image data into print image data using an input color conversion table and an output color conversion table;
A printing step of printing a printed matter by a printing device according to the print image data;
Reading the printed matter by a second image reading unit to obtain printed matter read image data representing a read image of the printed matter;
A correspondence relationship between the signal value of the first color space obtained from each of the first image reading unit and the second image reading unit and the chromaticity value of the second color space which is a device-independent color space. A read image color conversion step of converting a signal value of the first color space into a chromaticity value of the second color space using a first color conversion table representing;
Processing for associating the positional relationship between the printed image data and the document image data represented by the signal values of the first color space obtained by reading the printed material with the second image reading unit, and the target printed material Is performed by associating the positional relationship between the target printed matter read image data represented by the signal value of the first color space and the original image data obtained by reading the image with the first image reading unit. A printed product read chromaticity value image data obtained by converting a signal value of the printed product read image data into a chromaticity value of the second color space in the read image color conversion step or the original image data. The target mark obtained by converting the signal value of the target printed matter read image data into the chromaticity value of the second color space by the process of associating the positional relationship and the read image color conversion step. An image correlating step of performing processing for associating the positional relationship between the object read chromaticity value image data and the original image data,
The original image data represented by the signal value of the third color space which is a device-dependent color space, the chromaticity value of the target printed matter obtained through the processing in the image association step and the read image color conversion step, and the Color conversion for creating a color conversion table used for color conversion in the original image color conversion step based on the difference between the chromaticity value of the target printed material and the chromaticity value of the printed material from the correspondence relationship with the chromaticity value of the printed material Table creation process;
A color conversion table creation method comprising: A function of acquiring read image data representing a read image of the target printed matter from a first image reading unit that reads the target printed matter;
A function of acquiring read image data representing a read image of the printed matter from a second image reading unit that reads the printed matter printed by the printing apparatus;
A correspondence relationship between the signal value of the first color space obtained from each of the first image reading unit and the second image reading unit and the chromaticity value of the second color space which is a device-independent color space. A first color conversion function that converts a signal value of the first color space into a chromaticity value of the second color space using a first color conversion table that represents
A second color conversion function for converting document image data into print image data using the input color conversion table and the output color conversion table;
Printed material read image data represented by signal values of the first color space obtained by reading the printed material printed by the printing apparatus according to the print image data with the second image reading unit, and the original image A process for associating a positional relationship with data, and a target printed matter read image data represented by a signal value of the first color space obtained by reading the target printed matter by the first image reading unit; An image association function for performing a process of associating the positional relationship of the printed matter, or a printed matter reading obtained by converting a signal value of the printed matter read image data into a chromaticity value of the second color space by the first color conversion function. The signal value of the target printed material read image data is converted to the previous value by the process of associating the positional relationship between the chromaticity value image data and the document image data and the first color conversion function. And an image correspondence function of performing processing for associating the positional relationship between the target print reading chromaticity value image data obtained by converting the chromaticity value and the original image data of the second color space,
The original image data represented by the signal value of the third color space which is a device-dependent color space, and the chromaticity value of the target printed matter obtained through the processing by the image association function and the first color conversion function, A color conversion table for creating a color conversion table used for the second color conversion function based on the difference between the chromaticity value of the target printed material and the chromaticity value of the printed material from the correspondence relationship with the chromaticity value of the printed material Create function,
A program that makes a computer realize.