JP2000321142A - Method for estimating spectroscopic sensitivity of scanner and method and apparatus for forming duplication of scanner matching colorimetry reproduction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form such a duplication as an original image data and a duplicated image data are most approximate to each other by estimating the spectroscopic sensitivity data of a plurality of different scanners previously using a predetermined method and operating one image output signal value from image output signal values obtained for the plurality of different scanners. SOLUTION: The inventive apparatus comprises a part for estimating the spectroscopic sensitivity of a user scanner, and a part pertaining to formation of duplication. The part for estimating the spectroscopic sensitivity of a user scanner comprises a section 52 for holding an estimated sample spectroscopic transmittance data, a section 54 for calculating the estimated sample scanner value, a section 56 for forming a scanner value/transmittance value conversion table, and a section 58 for estimating a user scanner spectroscopic sensitivity. The part pertaining to formation of user application comprises a part pertaining to formation of a conversion table, and a part for forming a duplication of an original sample image. The part pertaining to formation of a conversion table comprises a section 32 for holding a user transmittance data, and a section 42 for forming a scanner data transmittance value conversion table.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for estimating a spectral sensitivity of a scanner and a method and an apparatus for producing a scanner matching colorimetric reproduction duplication using the same.

[0002]

2. Description of the Related Art Hitherto, so-called duplication in which another positive film is duplicated from a positive film (reversal color film) for slide screening or printing has been performed. In the case of performing reversal film duplication, recently, a digital duplication system using a scanner, a film recorder, and a digital output film has begun to spread. In such a system, when the same type of film is used for both the original and the output, the color reproduction accuracy is high. The fact is that the color reproduction accuracy decreases.

Conventionally, as a method of color matching for digital duplication, for example, a duplication system for performing color matching with software attached to a film recorder is known. Specifically, for example, Symbol
ic Sciences International's software, Fire
Ware. This is because the measurement system is a densitometer and scanner, and a one-dimensional lookup table (1DLUT)
And a three-dimensional look-up table (3DLUT) of a scanner and an output unit, and the output unit is a film recorder Light Jet.

[0004]

However, in a conventional duplication, for example, when a duplicate is used as a print original, the duplicate is read by a user's scanner. As a result, there is a problem that a difference occurs in the output value due to the spectral sensitivity of the scanner, and an error in color reproduction may occur. This is due to the difference in spectral sensitivity between the scanner that reads the original image and the user's scanner that reads the duplicate when performing digital duplication. In this regard, the above problem has not been solved even in the software of the above-mentioned conventional color matching method.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and includes an image data obtained by reading an original image by a user's scanner during duplication, and an image obtained by reading a duplicate by a user's scanner. An object of the present invention is to provide a duplication technique capable of creating a copy whose data is closest to the data.

[0006]

According to a first aspect of the present invention, there is provided a method for estimating a spectral sensitivity of a user scanner prior to performing scanner matching colorimetric reproduction duplication. A spectral sensitivity analysis chart having a number of color patches having different spectral transmittances or spectral reflectances in which gray patches are juxtaposed to each other is measured by a spectral colorimeter to obtain spectral transmittance data or spectral reflectance data. Along with this, the chart is recorded with a scanner to obtain a scanner recording value, and the scanner recording value obtained from the gray patch in the chart and the spectral transmittance data or spectral reflectance data obtained from the gray patch in the chart are converted into wavelengths. From the transmittance or reflectance averaged in the direction, the scanner recorded value and the transmittance or reflectance based value A one-dimensional table showing the relationship is created, and all of the scanner recorded values obtained by recording the chart with a scanner are converted into transmittance-based or reflectance-based values using the one-dimensional table, and the chart is spectrally analyzed. Scanner between spectral transmittance data or spectral reflectance data obtained by colorimetry with a colorimeter and a value obtained by converting a scanner recorded value into a transmittance or reflectance based value using the one-dimensional table. A scanner spectral sensitivity estimating method characterized by estimating a spectral sensitivity of a scanner by obtaining a matrix element by an optimization operation, assuming a matrix conversion by a matrix representing spectral sensitivity.

[0007] In order to solve the above problems, the present invention provides:
A spectral sensitivity analysis chart having a number of color patches having different spectral transmittances or spectral reflectances, in which gray patches are juxtaposed in part, and a spectrum for obtaining spectral transmittance data or spectral reflectance data by measuring the color of the charts A colorimeter,
A scanner that obtains a scanner recording value from the chart, a scanner recording value obtained from a gray patch in the chart, and transmission obtained by averaging spectral transmittance data or spectral reflectance data obtained from a gray patch in the chart in the wavelength direction. 1 showing the relationship between the scanner recorded value and the transmittance or reflectance based value from the reflectance or reflectance.
A conversion table creation unit for creating a dimension table, using the one-dimensional table, and converting all of the scanner recorded values obtained by recording the chart with a scanner into transmittance or reflectance based values; and Matrix conversion by a matrix representing scanner spectral sensitivity between spectral transmittance data or spectral reflectance data obtained by colorimetry using a spectrophotometer and values obtained by converting scanner recording values using the one-dimensional table. And a scanner spectral sensitivity estimating unit that obtains the matrix element by an optimization operation.

In order to solve the above problem, a second aspect of the present invention is to input an image input signal value from an object of duplication, and obtain a plurality of values estimated by the method according to the first aspect. Spectral sensitivity data of various scanners and
Using a first conversion table showing a relationship between an image input signal value and predetermined transmittance data by a predetermined scanner, the image input signal value is converted into predetermined transmittance data by a plurality of various scanners, and Using a second conversion table showing the relationship between predetermined transmittance data and image output signal values by the scanner, the image input signal value converted into transmittance data by the various scanners is a photograph that matches the target object. Converted to image output signal values for obtaining with materials, from a plurality of image output signal values obtained for the various scanners,
A method for producing a scanner-matching colorimetric reproduction duplication application, wherein one image output signal value is obtained by a predetermined operation, and the obtained image output signal value is output to a photographic material that matches the object according to the image output signal value. I do.

Further, regarding the second conversion table,
A conversion table creation chart is output to a predetermined photographic material, the chart is measured with a spectrophotometer, and using the scanner spectral sensitivity data estimated by the method according to claim 1,
Calculate predetermined transmittance data by a predetermined scanner, create the second conversion table from the relationship between the transmittance data and the image output signal value when outputting the chart, and perform the first conversion. For the table, the chart is image-recorded, an image input signal value is obtained, and is associated with an image output signal value when outputting the chart, and using the second conversion table, the image input signal value and Preferably, the first conversion table is created from the relationship with the transmittance data.

It is preferable that the first and second conversion tables are obtained by providing a table created in advance from outside.

It is preferable that the predetermined calculation is a weighted average of the plurality of image output signal values.

Further, the photographic material is preferably a transmission type photographic material.

[0013] Similarly, in order to solve the above-mentioned problems,
The present invention provides an image input signal holding unit for holding an image input signal value obtained by recording from an object of duplication, and spectral sensitivity data of various scanners estimated by the method according to claim 1 in advance. A user scanner spectral sensitivity data holding unit, a first conversion table indicating a relationship between an image input signal value and predetermined transmittance data by a predetermined scanner, and predetermined transmittance data and image output by a predetermined scanner. The second conversion table indicating the relationship with the signal value, and referring to the spectral sensitivity data of the various scanners estimated in advance, using the first conversion table, the image input signal value, by various scanners An image transmittance data conversion unit for converting the image data into predetermined transmittance data, and using the second conversion table to convert predetermined transmittance data from the various scanners into an image. An image output data conversion unit that converts the image output signal value into a force signal value, performs a predetermined operation on the image output signal value for the various scanners, and finally calculates output image data. Provided is a colorimetric reproduction duplication preparation device.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A scanner spectral sensitivity estimation method and apparatus of the present invention and a scanner matching colorimetric reproduction duplication creating method and apparatus using the same will be described in detail based on preferred embodiments shown in the accompanying drawings. Will be described. According to the present invention, in order to create a copy in which the image data read at the time of duplication and the image data obtained by reading the copy with a user's scanner are closest to each other, a (user) scanner is first used. Is estimated. Then, the duplication is created so that the spectral sensitivity of the scanner at the time of creating the duplication and the scanner of the user are matched.

FIG. 1 is a block diagram showing an example of a digital duplication system incorporating a scanner spectral sensitivity estimating apparatus and a colorimetric reproduction duplication creating apparatus according to an embodiment of the present invention. The digital duplication system of this embodiment performs duplication of a reversal film. As shown in FIG. 1, mainly a duplication creation device (hereinafter, referred to as a creation unit) 10, an image input device (hereinafter, referred to as an input unit) 12, and an image output device (hereinafter, referred to as an output unit) 14.
And a spectrophotometer 16. Specifically, the creating unit 10 is a computer, the input unit 12 is a scanner, and the output unit 1
Reference numeral 4 denotes a printer or a film recorder. The input unit 10 records the original sample image 20 to be duplicated, and the output unit 14 outputs the duplication created by the creation unit 10 as a duplicate image 22. Spectrophotometer 16
Is to measure the chart 24 output by the output unit 14 and obtain a spectral transmittance value in order to obtain data for creating a conversion table for performing colorimetric reproduction duplication.

In this embodiment, the spectral sensitivity of the user's scanner is first estimated. For this purpose, a sample 28 for measuring the spectral sensitivity of the scanner is recorded by the user scanner 26, and the data is stored in, for example, a network or a floppy disk. Is input to the creating unit 10 through the recording medium 29. At the same time, the scanner spectral sensitivity measurement sample 28 is measured by the spectrophotometer 16, and the data is also sent to the creating unit 10.

FIG. 2 is a block diagram showing a schematic configuration of the creating unit 10 in the present embodiment. The creating unit 10 roughly divides a portion for estimating the spectral sensitivity of the user scanner,
The part related to the creation of the duplication includes a part related to the creation of the conversion table, and the part related to the creation of the duplication of the original sample image.

The parts relating to the creation of the conversion table include a chart data creating section 30, a spectral transmittance data holding section 32, a transmittance value data calculating section 34, a user scanner spectral sensitivity data holding section 36, an output data / transmittance value conversion. It comprises a table creation unit 38, a chart scanner recording data holding unit 40, and a scanner data / transmittance value conversion table creation unit 42. The portion related to duplication creation includes an image scanner recording data holding unit 44, an image transmittance value data conversion unit (image transmittance data conversion unit) 46, and an image output data conversion unit 50. The portions for estimating the spectral sensitivity of the user scanner include an estimated sample spectral transmittance data holding unit 52, an estimated sample scanner value calculating unit 54, a scanner value / transmittance value conversion table creating unit 56, and a user scanner spectral sensitivity estimating unit. It consists of 58.

Hereinafter, the operation of the present embodiment will be described. First, a method of estimating the spectral sensitivity of the user scanner will be described. First, a sample 28 for estimating the scanner spectral sensitivity, which is a chart for analyzing the spectral sensitivity of the user scanner, is created. This is made by, for example, cutting out what is necessary from a so-called gelatin filter, and is composed of many color patches (84 colors) and gray patches (12 colors). The spectral transmittance p (λ) of the patch portion of the scanner spectral sensitivity estimation sample 28 is measured by the spectral colorimeter 16. The measured spectral transmittance p (λ) of the patch portion is sent to the estimated sample spectral transmittance data holding unit 52 and held therein.

On the other hand, the scanner spectral sensitivity estimation sample 2
Reference numeral 8 denotes a user scanner 2 to be analyzed for spectral sensitivity estimation.
6, the image is recorded. This recording is performed by measuring the entire chart portion at once. The recorded image is sent by the recording medium 29 to the estimated sample scanner value calculation unit 54 of the creation unit 10 of the present system. The estimated sample scanner value calculator 54 calculates the scanner recorded values o (r, g, b) of the patch portion of the recorded image.

Next, in the scanner value / transmittance value conversion table creating section 56, a scanner value / transmittance value conversion table which is a one-dimensional lookup table (1DLUT) showing a relationship between the scanner recording value and the transmittance value is stored. , Each r, g,
Create for b. First, the scanner value / transmittance value conversion table creation unit 56 calculates the average of the measurement data p (λ) of each gray patch in the wavelength λ direction from the measurement data stored in the estimated sample spectral transmittance data storage unit 52. To obtain gray patch transmittance data _pga . Next, the scanner value is obtained from the gray patch recording data o _g (r, g, b) of the scanner recording value o (r, g, b) obtained above and the gray patch transmittance data p _ga just obtained.・ Transmit the transmittance value conversion table (1DLUT) to r, g, b
About three kinds are created. And this scanner value
Using the transmittance value conversion table, all the actually measured scanner recorded values o (r, g, b) obtained above are converted into transmittance-based scanner recorded values o ′ (r, g, b).

Next, in estimating the scanner spectral sensitivity, a scanner color conversion system model shown in FIG. 3 is assumed, and the scanner spectral sensitivity is estimated using this model. As shown in FIG. 3, in the scanner conversion system model adopted here, a scanner signal is output in the following procedure.

That is, in step m1, the scanner spectral sensitivity f _rgb (λ) is applied to the input patch spectral transmittance p (λ) as in the following equation (1) in step m2.
An estimated value o "(r, g, b) of the scanner recording value is calculated. O" (r, g, b) = _frgb (λ) p (λ) (1) Is actually a matrix operation of an order corresponding to the number of data. This estimate o "(r, g, b) with respect to, using a 1-dimensional look-up table f _un in Step m3 following formula (2)
And the scanner output signal o (r, g,
Obtain b). o (r, g, b) = _fun (o "(r, g, b)) (2)

If necessary, a color conversion matrix operation is performed in step m4. However, in this case, since conversion by a matrix is not required, step m4 is represented by a broken line. In actual calculation, the color conversion matrix may be a unit matrix. Then, the scanner output signal o (r, g, b) is finally obtained and output (procedure m5). In the present embodiment, the spectral sensitivity f _rgb (λ) of the scanner is estimated assuming the above model.

As described above, the procedure m
1 and the scanner output signal o (r, g, b) in step m5, are obtained.
From this, the scanner spectral sensitivity _frgb (λ) (element of the matrix) is estimated. Here, in the scanner value / transmittance value conversion table creating unit 56, the scanner recorded value o (r, g, b) obtained by actual measurement is converted into a transmittance-based scanner recorded value o ′ (r, g, b). It shall be be regarded scanner output signal o in the model of FIG. 3 (r, g, b) in that which was subjected to reverse transformation 1DLUTf _un. Then, according to the model of FIG.
(r, g, b) the estimated value of the scanner From value is data before performing the conversion by _{1DLUTf un o "(r, g} ,
It should correspond to b).

Then, by optimization operation, o "(r, g,
Estimate the scanner spectral sensitivity _frgb (λ) such that b) best approaches o '(r, g, b). Although the optimization operation is not particularly limited, for example, a method of obtaining the one that minimizes the square of the difference represented by the following equation (3) by the simplex method is preferably exemplified. Σ ｛o ″ _K (r, g, b) −o _K (r, g, b)｝ ² (3) where the sum に お け る in equation (3) is K = 1,. Where M is the number of charts of the estimated sample, and the actual calculation is also preferably performed with data at 10 nm intervals because of the number of data. Then, the number of data is 40. In this way, the spectral transmittance p (λ) of the estimated sample and the scanner recorded value o (r, g, b) are obtained.
From the above, the spectral sensitivity of the user scanner (specifically, the matrix f
The element (coefficient) of _rgb (λ) is estimated.

In the user scanner spectral sensitivity estimating section 58,
The spectral transmittance p (λ) of the estimated sample is obtained from the estimated sample spectral transmittance data holding unit 52, and the scanner recorded value o ′ () converted to transmittance-based data from the scanner value / transmittance value conversion table creation unit 56 is obtained. After obtaining r, g, b), the user scanner spectral sensitivity _frgb (λ) is estimated by the method described above. The estimated user scanner spectral sensitivity _frgb (λ) is sent to the user scanner spectral sensitivity data holding unit 36.

In the scanner spectral sensitivity estimating method described above, for example, the spectral transmittance obtained by measuring the transmitted light of an analysis chart created by cutting out a gelatin filter with a spectral colorimeter is used. May be attached to a white background, and the reflected light may be measured with a spectrophotometer to use the spectral reflectance. In that case, the estimated sample spectral transmittance data holding unit 52 becomes the estimated sample spectral reflectance data holding unit 52. In addition, processing is performed by replacing all spectral transmittances with spectral reflectances.

Next, a method for creating an output data / transmittance value conversion table (second conversion table, second 3DLUT) and a scanner data / transmittance value conversion table (first conversion table, first 3DLUT) Will be described.
First, the creation of the second 3DLUT will be described. This table shows the relationship between the transmittance value and the output signal. First, prepare chart data for creating a lookup table. The output unit 14 is a film recorder. In the chart data creation unit 30 of the creation unit 10, a chart composed of a combination FR (i, j, k) of the representative values of the R, G, and B output signals of the film recorder. Create data (output signal). Here, i, j, k = 1,
2,..., N. That is, FR (i, j, k)
Corresponds to grid data of an N × N × N 3DLUT.
The chart data (output signal) FR (i, j, k) is output from the output unit (film recorder) 14 to a plurality of reversal films assumed for input and output, and the chart 24 is output.
Is created.

The charts 24 on the plurality of reversal films just created are measured by the spectrophotometer 16,
The spectral transmittance data D (f, i, j, k, wl) is obtained. Here, the suffix f indicates the type of the film, and wl indicates the wavelength. The wavelength is usually 380 to 780 nm, and is spaced at intervals of 5 or 10 nm. Spectral transmittance data D (f,
i, j, k, wl) are sent to the spectral transmittance data holding unit 32 of the creating unit 10.

Next, in the transmittance value data calculation section 34, the spectral transmittance data D (i, j, k, wl) and the user scanner spectral sensitivity data L prepared in advance in the user scanner spectral sensitivity data holding section 36 are stored. From (l, wl), the scanner transmittance value C (l, f, i, j, k) is calculated. Here, 1 (ell) represents the type of the scanner.

Next, in the output data / transmittance value conversion table creation section 38, the R, G, B output signals FR (i, j,
k) and the scanner transmittance value C (l, f, i, j, k) obtained by the transmittance value data calculator 34, and the relationship C (l, f, i, j, k) ← → Output data / transmittance value conversion table (second 3) indicating FR (i, j, k)
DLUT). The second conversion table forms a database described by a set of a plurality of 3DLUTs using the film type and the (user) scanner type as parameters.

Next, the creation of the first 3DLUT will be described. This shows the relationship between the input image data and the transmittance value. In order to create the first 3DLUT, the chart 2 is scanned by the image recording scanner of the input unit 12.
4 and the chart scanner recorded data S (f, i,
j, k), the chart scanner recording data holding unit 4
Send to 0.

Then, in the scanner data / transmittance value conversion table creation unit 42, the chart data creation unit 30
The output signals FR (i, j, k) of the R, G, and B chart data of the film recorder created in step (1) and the chart scanner recording data S (f, i, j, k) in the chart scanner recording data holding unit 40. (Conversion table) S (f, i, j, k) ← → FR (i, j, k) Next, this relationship and the output signal FR (i, j, k) and the scanner transmittance value C (l, f, i) expressed in the database of the output data / transmittance value data conversion table obtained above. , J, k), FR (i, j, k) ← → C (l, f, i, j, k), and the chart scanner recorded data S (f, i, j, k)
k) and the scanner transmittance values C (l, f, i, j, k) are associated with each other, and the relationship: S (f, i, j, k) ← → C (l, f, i, j,
k), a scanner data / transmittance value conversion table (first 3DLUT) is created.

This first 3DLUT is also a second 3DLUT.
Similarly to the above, a database described by a set of a plurality of 3DLUTs using the film type and the user scanner type as parameters is formed. Also, this conversion table is directly
(F, i, j, k) and C (l, f, i, j, k) are not related to each other, but S (f, i, j, k) via FR (i, j, k). k) ← → FR (i, j, k) ← → C
A double structure of (l, f, i, j, k) may be used.

As described above, in the present embodiment, the conversion tables (first and second 3DLUTs) are created by the creation unit 1
0, but the present invention is not limited to this. An already created table may be provided from outside (for example, from a manufacturer or the like via the Internet).

Next, a method of actually creating a duplication and outputting a duplicate image will be described. The original sample image 20 recorded by the scanner of the input section 12 First, the image scanner From data _{SI (f i, i, j} , k)
And Here, f _i is a recording film type. Image scanner From data _{SI (f i, i, j} , k) is sent to the image scanner From data holding portion 44 of the creating unit 10.

Next, when the film type and the scanner type of the original sample are designated, the image transmittance value data conversion unit 46
User scanner spectral sensitivity data holding unit 36 estimated in advance
The scanner data / transmittance value conversion table (first 3D LU) is referred to the user scanner spectral sensitivity stored in
From the database of T), a scanner data / transmittance value conversion table that satisfies the condition for the designated scanner type is selected. Then, the image transmittance value data conversion unit 4
6 refers to the scanner data transmission value conversion table selected, the image scanner From data SI (f i, _i,
j, k) is converted into scanner transmittance value data CI (l). Here, 1 is the type of the user scanner.

Next, when a film type of the output film and a user scanner type which are excellent in the film recorder such as the color reproduction range and the flare resistance are designated, the image output data conversion unit 5
0 is an output data / transmittance value conversion table (second 3DL) with reference to the user scanner spectral sensitivity estimated in advance and held in the user scanner spectral sensitivity data holding unit 36.
From the UT) database, an output data / transmittance value conversion table that meets the conditions is selected. Then, the image output data conversion unit 50 refers to the selected output data / transmittance value conversion table and converts the scanner transmittance value data CI (l) of the image obtained above into a film recorder, a film type, and the like. It is converted into image output data (image output signal) FR (i, j, k) according to the output environment.

After the original sample image 20 is recorded by the scanner, the film type and the scanner type are designated, the conversion table is referred to, the recorded image is converted into a transmittance value, and further converted into output data. The process is repeated while changing the scanner type, and a plurality of image output data suitable for each scanner type is created.

Then, finally, a predetermined function operation is performed on each of the plurality of image output data for each pixel to calculate one image output data. The function operation is not particularly limited, and for example, a weighted average for each light source is preferably exemplified. In other words, by weighting according to the proportion used among several scanner types, it is possible to create a copy that is closest to the image data obtained by reading the original image with the scanner that the user frequently uses. it can.

Hereinafter, specific embodiments will be described.

EXAMPLES As an example, the film used was EPR manufactured by Kodak Co., Ltd. as an input film and Fujichrome "Digital Output Film" (DOF) manufactured by Fuji Photo Film Co., Ltd. as an output film. The scanner was manufactured by Dainippon Screen. SG1000 and Celsis 6250 manufactured by Fuji Photo Film Co., Ltd. were used as a user scanner. The printer is LightJe made by CSI.
Using t2080, TC1800 manufactured by Tokyo Denshoku Co., Ltd. was used as the spectrophotometer. The patch specification is 9 × 9
X 9 colors, the size of one patch is 3 x 3 mm, and the color chart for spectral sensitivity analysis (estimation sample) is 96 types of optical filters manufactured by Fuji Photo Film Co., Ltd.
(12 filters) were used.

With the above settings, the original and the copy are input by the target scanner Celsis 6250,
Using this as a manuscript and performing the above-described processing, these reproductions were created and visually evaluated. As a result, the reproduction accuracy was sufficient. The CIELab 1976 average color difference of 24 colors of the Macbeth chart was 1.6. As described above, according to this embodiment, when EPR is used for the input film (original) and DOF is used for the output film (duplicate), digital duplication with excellent color reproduction accuracy as described above is performed on the scanner. Was completed.

In the above embodiments, the duplication of a reversal film for digital output has been described. However, the present invention can be applied to the duplication of a general reversal film or a general transmissive photographic light-sensitive material such as a transmissive display light-sensitive material. Can be applied, and an excellent effect can be obtained. Furthermore, with regard to general photographic materials, the case where a photo (print) image is read by a scanner and a duplicate image is output on the same photographic material is widely included in the concept of duplication. Is reflected light, not transmitted light. However, if the same processing as above is performed on these image data using spectral reflectance instead of spectral transmittance as transmittance data, color reproduction It is possible to create a copy having excellent properties.

Although the scanner spectral sensitivity estimation method of the present invention and the scanner matching colorimetric reproduction duplication creating method and apparatus using the same have been described in detail above, the present invention is not limited to the above examples. Of course, various improvements and changes may be made without departing from the spirit of the present invention.

[0046]

As described above, according to the present invention, when read by a user's scanner, a duplicate with excellent color reproduction accuracy is obtained which is closest to image data obtained by reading the original with the scanner. Can be.

[Brief description of the drawings]

FIG. 1 is a block diagram schematically illustrating a duplication system including a colorimetric reproduction duplication creation device according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating a creation unit of FIG. 1;

FIG. 3 is a block diagram showing a scanner color conversion system model used in scanner spectral sensitivity estimation in the embodiment.

[Explanation of symbols]

 Reference Signs List 10 creation unit (duplication creation device) 12 input unit (image input device) 14 output unit (image output device) 16 spectrophotometer 20 original sample image 22 duplicate image 24 chart 30 chart data creation unit 32 spectral transmittance data Holding unit 34 Transmittance value data calculation unit 36 User scanner spectral sensitivity data holding unit 38 Output data / transmittance value conversion table creation unit 40 Chart scanner recording data holding unit 42 Scanner data / transmittance value conversion table creation unit 44 Image scanner recording Data holding unit 46 Image transmittance value data converting unit 50 Image output data converting unit 52 Estimated sample spectral transmittance data holding unit 54 Estimated sample scanner value calculating unit 56 Scanner value / transmittance value conversion table creating unit 58 User scanner spectral sensitivity estimation Department

Claims (8)

[Claims] 1. A spectral sensitivity analysis chart having a number of color patches having different spectral transmittances or spectral reflectances in which gray patches are juxtaposed in part is measured by a spectral colorimeter to obtain spectral transmittance data or While obtaining spectral reflectance data, the chart is recorded with a scanner to obtain a scanner recorded value, the scanner recorded value obtained from the gray patch in the chart, and the spectral transmittance data obtained from the gray patch in the chart or From the transmittance or reflectance obtained by averaging the spectral reflectance data in the wavelength direction, the relationship between the scanner recorded value and the transmittance or reflectance-based value is shown.
Creating a dimension table, using the one-dimensional table, converting all the scanner recorded values obtained by recording the chart with a scanner to transmittance or reflectance based values, and converting the chart with a spectrophotometer It represents scanner spectral sensitivity between spectral transmittance data or spectral reflectance data obtained by color measurement and a value obtained by converting a scanner recording value into a transmittance or reflectance-based value using the one-dimensional table. A scanner spectral sensitivity estimating method characterized by estimating a spectral sensitivity of a scanner by assuming matrix transformation by a matrix and obtaining the matrix element by an optimization operation. 2. A spectral sensitivity analysis chart having a number of color patches having different spectral transmittances or spectral reflectances in which gray patches are juxtaposed in part, and spectral transmittance data or spectral reflectances obtained by measuring the color of the charts. A spectrophotometer that obtains rate data; a scanner that obtains a scanner recording value from the chart; a scanner recording value obtained from a gray patch in the chart; and spectral transmittance data or spectrum obtained from a gray patch in the chart. From the transmittance or reflectance obtained by averaging the reflectance data in the wavelength direction, the relationship between the scanner recorded value and the transmittance or reflectance-based value is shown.
A conversion table creation unit that creates a dimension table, and converts all the scanner-recorded values obtained by recording the chart with a scanner into transmittance- or reflectance-based values using the one-dimensional table; Matrix conversion by a matrix representing scanner spectral sensitivity between spectral transmittance data or spectral reflectance data obtained by colorimetry using a spectrophotometer and values obtained by converting scanner recording values using the one-dimensional table. And a scanner spectral sensitivity estimating unit that obtains the matrix element by an optimization operation. 3. An image input signal value input from an object of duplication, and spectral sensitivity data of a plurality of various scanners estimated by the method according to claim 1, and image input signal values and a predetermined scanner. Using a first conversion table indicating a relationship with predetermined transmittance data, the image input signal value is converted into predetermined transmittance data by a plurality of various scanners, and the predetermined transmittance data by a predetermined scanner and Using a second conversion table showing the relationship with the image output signal value, the image output signal value for obtaining the image input signal value converted into transmittance data by the various scanners with a photographic material that matches the object To obtain one image output signal value by a predetermined operation from a plurality of image output signal values obtained for the various scanners, and according to the image output signal value And outputting to a photographic material that matches the object. 4. A method according to claim 1, wherein a chart for preparing the conversion table is output to a predetermined photographic material, and the chart is measured by a spectrophotometer. Using scanner spectral sensitivity data,
Calculating predetermined transmittance data by a predetermined scanner, creating the second conversion table from the relationship between the transmittance data and an image output signal value when outputting the chart, and performing the first conversion For the table, the chart is image-recorded, an image input signal value is obtained, and the image output signal value at the time of outputting the chart is made to correspond to the image input signal value. 4. The method for creating a scanner matching colorimetric reproduction duplication according to claim 3, wherein the first conversion table is created from a relationship with the transmittance data. 5. The method according to claim 3, wherein the first and second conversion tables are obtained by externally providing tables prepared in advance. 6. The method according to claim 3, wherein the predetermined calculation is a weighted average of the plurality of image output signal values. 7. The method according to claim 3, wherein the photographic material is a transmission type photographic material. 8. An image input signal holding section for holding an image input signal value obtained by recording from an object of duplication, and spectral sensitivity data of various scanners estimated in advance by the method according to claim 1. A user scanner spectral sensitivity data holding unit, a first conversion table indicating a relationship between an image input signal value and predetermined transmittance data by a predetermined scanner, and predetermined transmittance data and an image by a predetermined scanner. A second conversion table indicating a relationship with an output signal value, and referring to the spectral sensitivity data of the various scanners estimated in advance, using the first conversion table, the image input signal value is converted into various scanners. And an image transmittance data conversion unit for converting the image data into predetermined transmittance data according to the above-described second conversion table. An image output data conversion unit that converts the image output signal value into an image output signal value, performs a predetermined operation on the image output signal value for the various scanners, and finally calculates output image data. A matching colorimetric reproduction duplication creation device.