JPH11215378A - Control method for scanner and its recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To generate image data while a logic relation is kept by correcting image data which a scanner reads and generating a correction table converting image data into that following a logic value which the scanner device outputs. SOLUTION: In a scanner 2, a correction table 24a for correcting an output value which a light-receiving part 23 outputs is formed in an EEPROM part 24 storing the drive conditions for a light-emitting part 22 and the light-receiving part 23. A driver program 12 incorporated in a host device 1, to which the scanner 2 is connected has a slice level for arranging image data transferred from the scanner 2. In such a case, a correction table 24a for calculating the difference value between an output value obtained by permitting the scanner 2 to previously read a reference original making the image density to be clear and to generate it and a logic value which the scanner 2 outputs, correcting the image data which the scanner 2 reads based on the difference value and converting image data into that following the logic value which the scanner 2 outputs is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for correcting variations among individual scanner devices in a method for controlling a scanner device connected to a host device.
Further, the present invention relates to a technique for appropriately correcting image data read by the scanner device in response to a request from an application that handles the read image data.

[0002]

2. Description of the Related Art In a scanner connected to a host device, required characteristics of image data may differ depending on the type of application program that uses the read image data.

For example, when a handwritten character included in image data is converted into character data by an OCR program based on image data obtained by reading an original with a scanner, ruled lines that overlap with or are close to the corresponding handwritten character It is necessary to create a state of only the handwritten characters to be deleted and read, and to facilitate character recognition by the above-mentioned OCR program.

For this purpose, normally, ruled lines and the like printed on the original are printed in a specific color, and a scanner device uses a light source color for suppressing the reading of the print color, and furthermore, a low level with a predetermined slice level. A method of cutting off the minute signal and eliminating reading of the unnecessary portion is adopted.

Further, for example, when an image for filing is formed based on image data read by the above-mentioned scanner device, ruled lines and the like are surely read without blurring outside the above-mentioned handwritten sentence. There are required items such as removal of noise generated by a background pattern as seen in a ground color portion of a document or a document made of thin paper.

For this purpose, a technique of eliminating reading of the unnecessary portion with a predetermined slice level is adopted.

However, in an ordinary scanner device, the reading characteristics are kept the same between individual devices due to variations in the characteristics of the built-in CCD sensor, variations in the characteristics of the amplifier unit, and variations in the adjustment of the mechanical unit. It is difficult.

In order to maintain the same reading characteristics among the individual devices, careful adjustments are made in the production stage to adjust the reading characteristics before shipment. However, in the stage of use by the user, errors occur for various reasons. Or an obstacle such as reversing the initial adjustment value when replacing the light source lamp or the like.

Referring to FIGS. 16 to 20, a description will be given of a method of controlling a scanner device according to the prior art.

FIG. 16 shows a configuration of a conventional scanner device.

The scanner device 60 includes a light emitting section 62 for irradiating a document to be read, and a light receiving section 63 for receiving irradiation light reflected from the reading surface of the document. Via the host device 5
0 is transferred. The specific adjustment value of the light emitting unit 62 or the specific adjustment value of the amplifier or the like included in the light receiving unit 63 is EEP
It is stored in the ROM section 64.

The host device 50 includes a driver program 52 for controlling the scanner device 60. The driver program 52 has a slice level 52a serving as a reference for deleting an unnecessary portion of the image data transferred from the scanner device 60.

Further, the host device 50 has a built-in application program for processing the image data provided by the driver program 52.

Referring to FIG. 17, a flow in which image data read by the scanner device 60 is processed by the host device 50 will be described. The reference signs in each step are as shown in FIG.
by.

In step S51, an original is set on the scanner device 60, and the flow advances to step S51 to read the original. The output value generated at the light receiving unit 63 is
After being amplified by the amplifier incorporated in the CPU 3, the arithmetic and control unit 61 transfers the image data to the host device 50 in step S <b> 53.

In step S54, the host device 50 arranges the image data transferred from the scanner device 60 by deleting unnecessary portions based on the slice level 52a.

In step S55, the image is displayed as an image on the display unit 56 and the application program 5 in the subsequent stage is displayed.
Then, the image data is transferred to 3.

In step S56, the application program 53 processes the image data transferred from the driver program, and stores the image data processed in step S57 in a predetermined location designated by the application program 53. To be stored.

The above-mentioned application program 5
As an example of the processing of the image data in 3, the processing by the OCR program 53 a shown in FIG. 18 and the processing by the filing program 53 b shown in FIG. 19 are given.

The processing by the OCR program 53a will be described with reference to FIG. In step S56a, the OCR
The program 53a reads the image data and proceeds to step S
In step 56b, character data is generated from the image at the predetermined location, and the process proceeds to step S56c to perform processing such as replacement with the corresponding image data.

Referring to FIG. 19, the filing program 5
3b will be described. In step S56p, the OCR program 53a sets an area to be filed in the image data. In step S56q, a file destination for storing the image data is set, and in step S56q
The process proceeds to r, and the designated area portion of the image data is moved to a predetermined file destination. Step S56s
Executes the subsequent data processing.

FIG. 20 shows the density gradation of the image on the original to be read and the CCD reading the original.
The relationship with the output of the sensor is shown in an output diagram.

FIG. 20A shows the density gradation of the image on the original to be read and the C
4 shows an ideal relationship with an output value of a CD sensor. If the image density of the original changes from 0% to 100%,
The output value of the CCD sensor also changes linearly in accordance with the gradation change of the image density of the document.

Normally, low-frequency output noise caused by a stain on a document to be read, a background color portion of a document used for the document, or a background pattern as seen in a document made of thin paper is appropriately set. Eliminate the output below the slice level by truncating it.

In a document supplying image data to be applied to an OCR program for recognizing handwritten characters described in the document and converting the character data into character data, a frame line which clearly indicates a portion where the handwritten character is to be written is printed in a specific color. Then, the light source that irradiates the original at the time of reading is eliminated by truncating the light at the slice level that is appropriately set as the wavelength that suppresses reading of the frame line printed in the specific color.

However, in an actual individual scanner device, the characteristics of the CCD sensor or the aforementioned CCD
Due to variations in the characteristics of the amplifier that amplifies the output of the sensor, the density gradation of the image on the document and the output value of the CCD sensor that has read the document do not always maintain a linear relationship. In the device A, FIG.
Although an upward convex curve is formed as shown in (b), the device B has a downward convex curve as shown in FIG.

Therefore, in a device having a preset slice level fixed in practice, the image density level to be discarded actually varies among individual devices.

This means that compatibility between apparatuses cannot be maintained for image data obtained by reading the same original. In an application such as a photo pasted on an album, which directly uses read image data, there is no particular problem. However, the variation in output characteristics as described above requires a strict slice level such as OCR reading. This is an important issue for applications that need to be set in position.

In order to cope with the variation in the output characteristics between the individual devices, usually, an amplifier for amplifying the output of the CCD sensor is adjusted to correct the output characteristics of the CCD sensor so that the output characteristics become closer to a straight line. Alternatively, the slice level is adjusted so that appropriate image data can be supplied.

[0030]

As described above, the conventional method for controlling a scanner device has the following problems.

In an actual individual scanner device, C
Due to variations in the characteristics of the CD sensor or the characteristics of the amplifier that amplifies the output of the CCD sensor, the density gradation of the image on the original and the C
The output value of the CD sensor does not always maintain a linear relationship.

Therefore, it is difficult to maintain the compatibility of the image data between the individual devices due to the deviation of the characteristic from the linearity due to the above-mentioned variation.

In the application program using the image data read by the scanner device, it is necessary to erase a printed portion including a frame line other than the corresponding handwritten character as in an OCR program for reading handwritten characters described in an original. Or when it is necessary to delete only noise from the image data as unnecessary image information, it may be necessary to change the definition of the setting position of the slice level depending on the application program to be applied. For the above purpose, the setting position of the slice level must be strictly defined.

However, it is difficult to precisely define the setting position of the slice level due to the deviation of the characteristic from the linearity due to the above-mentioned variation.

[0035]

In order to solve the above problems, the present invention employs the following means.

1) A reference document whose density gradation is clearly set is read by a scanner device, and a difference between an output value obtained by reading the reference document and a theoretical value is calculated.

2) On the basis of the difference between the output value obtained by reading the reference document and the theoretical value, a correction table for correcting the image data read by the scanner is generated.

By adopting this means, an effect is obtained that the density gradation characteristics of the image data read by the scanner device maintain linearity.

3) When the scanner device reads a document, the correction table can be adjusted according to the slice level or the light source color.

By taking this means, an effect is obtained that the image data read by the scanner device is corrected in accordance with its use.

[0041]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention takes the following forms.

1) In the control method of the scanner connected to the host device, the difference between the output value generated by reading the reference document for defining the image density in advance and the theoretical value to be output by the scanner is generated. The scanner calculates a value, corrects image data read by the scanner device based on the difference value, and forms a correction table for converting the image data into image data according to a theoretical value to be output by the scanner device.

By taking this form, an effect is obtained that image data read by the scanner device is corrected by the correction table.

2) A correction table for correcting the image data read by the scanner device and converting the image data into image data conforming to the theoretical value to be output by the scanner device is formed in an EEPROM section built in the scanner device. I do.

By taking this form, an effect is obtained that the image data read by the scanner device is corrected by the correction table before being transferred to the host device.

3) A correction table for correcting image data read by the scanner device and converting the image data into image data conforming to a theoretical value to be output by the scanner device is built in a host device connected to the scanner device. Driver program.

By taking this form, an effect is obtained that image data read by the scanner device is corrected by a correction table formed in a driver program built in the host device.

4) The correction table has a sub-table for adjusting the correction values of the correction table and additionally correcting the image data read by the scanner device.

By taking this form, an effect is obtained that image data read by the scanner device is corrected by a sub-table formed in a driver program incorporated in the host device.

5) The sub-table for additionally correcting the image data read by the scanner device is configured such that the added correction value corresponds to the slice level contained in the driver program.

By taking this form, an effect is obtained that the image data read by the scanner device is corrected by a sub-table adjusted in accordance with the slice level.

6) The sub-table for additionally correcting the image data read by the scanner device has the additional correction value corresponding to the light source color of the light emitting section of the scanner device.

By taking this form, an effect is obtained that the image data read by the scanner device is corrected by a sub-table which is adjusted according to the light source color of the light emitting section.

7) On a recording medium storing a program for realizing a control method of the scanner connected to the host device, the scanner is caused to previously read a reference document for clarifying the image density and form a correction table. A procedure for converting image data read by the scanner device into image data according to a theoretical value to be output by the scanner device based on the correction table; anda correction value stored in the correction table. And storing the additional correction value for additionally correcting the image data read by the scanner device in the sub-table.

By taking this form, the scanner device has the effect of maintaining the linearity of the density gradation characteristics of the read image and correcting the image data according to the application applied to the subsequent stage.

[0056]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A representative embodiment according to the present invention will be described with reference to FIGS.

FIG. 1 shows the configuration of a representative embodiment according to the present invention. In the scanner device 2, an EEPROM stores driving conditions of the light emitting unit 22 and the light receiving unit 23.
In the M section 24, a correction table 24a for correcting the output value output from the light receiving section 23 is formed.

The driver program 12 built in the host device 1 connected to the scanner device 2 has a slice level for organizing the image data transferred from the scanner device 2. The driver program 12
The application program 13 for processing the transferred image data is constituted by, for example, an OCR program 13a or a filing program 13b.

FIG. 2 shows the configuration of another representative embodiment according to the present invention. The image data transferred from the scanner device 2 is stored in a correction table 12b or sub-table 12c formed in the driver program 12.
, And are arranged based on the slice level 12a and transferred to the application program 13 at the subsequent stage.

The procedure for generating a correction table according to the present invention will be described with reference to FIGS.

The light emitted from the light emitting section 22 to the original is converted into an electric signal by the light receiving section 23. The output value of the electric signal changes according to the intensity of the light reaching the light receiving unit 23, that is, the image density of the document.

FIG. 10 is a diagram showing various cases showing the relationship between the image density of the document and the output value of the light receiving section 23 corresponding to the image density.

FIG. 10A shows an ideal output diagram based on a theoretical configuration output from the light receiving section of the scanner device. The output value of the light receiving unit 23 changes linearly according to the image density of the document.

FIG. 10B shows an example of an output diagram output from the light receiving section of one actual scanner device A. The output value of the light receiving unit 23 cannot linearly change in accordance with the image density of the document, and the output value is represented by a curve having an upward convex shape.

FIG. 10C shows an output diagram example of another scanner device B. The output value of the light receiving unit 23 cannot linearly change in accordance with the image density of the document, and the output value is represented by a curve having a downward convex shape.

Therefore, the output values of the respective light receiving sections 23 in the scanners A and B exhibit different behaviors, so that the scanners A and B have different contents even if they have the same original. Output image data.

FIG. 10 (d) shows an example of an output diagram in which the correction is performed by the correction table in the actual one scanner device A shown in FIG. 10 (b). Generation of the correction table will be described later. With the above correction,
The output value of the light receiving section 23 changes linearly, and matches the output diagram shown in FIG.

FIG. 10 (e) shows an example of an output diagram obtained by performing a correction using a correction table in another actual scanner device B shown in FIG. 10 (c). Generation of the correction table will be described later. By the above-described correction, the output value of the light receiving unit 23 changes linearly, which matches the output diagram shown in FIG.

Therefore, in the scanners A and B, the output values of the respective light receiving sections 23 change linearly and coincide with the output diagram shown in FIG. There is no difference between the image outputs B and B.

The generation of the correction table will be described with reference to FIGS.

The reference document shown in FIG. 11A is read by the scanner device. The above-mentioned reference document accurately embodies a preset image density gradation. In the following description, the gradation of the image density is changed from 0% to 100%.
The description will be made based on an example of a reference document divided into the above.

That is, the reference document has a density of 0%,
An image area consisting of 20%, 40%, 60%, 80% and 100% is formed. Also, as shown in the expected value setting table shown in FIG.
A difference value which forms an expected value of an intermediate value between the above-mentioned areas of 0% density and 100% density is calculated using a value obtained by dividing the difference between the output values obtained by reading the area of.

By the difference value calculation, a difference between the expected value and the read value in the conversion table shown in FIG. 11C is obtained. Further, the intermediate value is interpolated from the difference shown in the conversion table shown in FIG. 11C to obtain a correction table having a difference between the expected value and the read value in the reading accuracy of the scanner device. FIG. 12 shows an example of a correction table created according to the above procedure.

The creation of a sub-table derived from the above-mentioned correction table will be described with reference to FIGS.

FIG. 13A shows an output diagram of image data corrected according to the correction table created in the above procedure. The image data changes linearly along the output line A in accordance with the image density of the document. Also, a slice level B is set for the predetermined density level.

As shown in FIG. 13 (b), a point P, which is the intersection of the output line A and the slice level B, is determined, and the gradient of the output line A about the point P is calculated as The output straight line A1 is obtained by changing each of them over the range a around the point P.

According to the output straight line A1, the correction table shown in FIG.
It becomes what is shown in. The correction table that has been subjected to the additional correction is stored as a sub-table 12c in the driver program 12 shown in FIG.

By the above-mentioned treatment, the above-mentioned sub-table 1
2c is set so as to increase the sensitivity to a change in the gradation density of the document especially near the slice level.

As shown in FIG. 13C, the output straight line A1
, The output value of the image data corresponding to the gradation density of the document can be changed. This has substantially the same effect as finely adjusting and varying the slice level up and down. Further, since the sensitivity to the change in the gradation density of the document is high near the slice level, the effect of the fine adjustment can be clearly shown.

According to the output straight line A1 having been subjected to the fine adjustment, the sub-table shown in FIG. 14 is further subjected to additional correction to become the one shown in FIG. The sub-table on which the above additional correction has been performed is stored as a sub-table 12c in the driver program 12 shown in FIG.

Referring to FIG. 3, a flow of creating a correction table executed in one embodiment of the present invention will be described. The reference numerals quoted in each step are based on FIG.

A reference document is set on the scanner 2 in the mode for setting the correction table in step S01, and the flow advances to step S02 to read the reference document.

In step S03, the scanner device 2
Transfers the image data obtained from the reference document to the host device 1.

In step S04, the host device 1 calculates a correction value based on the transferred image data.

In step S04a, the arithmetic control unit 11 first selects an area having a gradation density of 0% from the image data,
Proceeding to step S04b, the average value in the above-mentioned 0% density region is calculated. In step S04c, the above average value is temporarily stored, and the flow advances to step S04d to check whether or not there is data to be subsequently processed. Then, the flow returns to step S04a to select an area having a density of 10%.

According to the above procedure, the gradation density is 100%
If you end the temporary storage of the average value in the area. The calculation of the correction value is completed.

In step S05, a correction table is created based on the correction values calculated in the above procedure. The details of the above-described correction table creation have already been described in the description based on FIGS. 10 to 12.

In step S06, the above-mentioned correction table is transferred to the EEPROM 24 built in the scanner device 24 and stored as the correction table 24a.

Referring to FIG. 4, a flow of creating a correction table executed in another embodiment of the present invention will be described. The reference numerals quoted in each step are based on FIG.

A reference document is set on the scanner device 2 in the mode for setting the correction table in step S11, and the flow advances to step S12 to read the reference document.

In step S13, the scanner device 2
Transfers the image data obtained from the reference document to the host device 1.

In step S14, the host device 1 calculates a correction value based on the transferred image data.

In step S14a, the arithmetic and control unit 11 first selects an area having a gradation density of 0% from the image data,
Proceeding to step S14b, the average value in the above-mentioned 0% density region is calculated. In step S14c, the average value is temporarily stored, and the process proceeds to step S14d, where the presence or absence of subsequent data to be processed is confirmed, and the process returns to step S14a to select an area having a density of 10%.

According to the above procedure, the gradation density is 100%
If you end the temporary storage of the average value in the area. The calculation of the correction value is completed.

In step S15, a correction table is created based on the correction values calculated in the above procedure. The details of the above-described correction table creation have already been described in the description based on FIGS. 10 to 12.

In step S16, the above correction table is stored in the driver program 12 as a correction table 12b.

Referring to FIG. 5, the flow of image reading executed in one embodiment of the present invention will be described. The reference numerals quoted in each step are based on FIG.

In step S21, a document to be read is set on the scanner 2 set in the reading mode, and the flow advances to step S22 to read the document.

In step S23, the scanner device 2
The arithmetic and control unit 21 of FIG.
The correction is performed based on the correction table 24a stored in the EPROM section 24. The corrected image data is transferred to the host device 1 in step S24.

In step S25, the host device 1 that has received the transfer of the corrected image data performs processing such as deleting the signal in the low-level area based on the slice level 12a, and displays the processed image data. The image data is displayed on the section 16 and transferred to the application program 13 for performing the subsequent processing.

In step S27, the image data is processed in the application program 13, and in step S28, the data processed by the application program 13 is stored in a predetermined location, and the process ends. The details of the image data processing executed in step S27 will be described later.

Referring to FIGS. 6 and 7, an example of processing of image data by the application program executed in step S27 will be described.

As shown in FIG. 6, the image data is
A flow for performing character recognition using the program 13a will be described.

In step S27a, the OCR program 1
3a reads the image data and proceeds to step S27b to generate character data from the corresponding image.

In step S27c, the image data is changed by replacing the image data with a corresponding character.

In step S27d, the data subjected to the above-mentioned change processing is transferred to a subsequent application program to execute necessary processing.

Referring to FIG. 7, a description will be given of a flow when filing the image data using the filing program 13b.

In step S27p, an area to be filing is set from the image data.

In step S27q, a file destination for storing the image data is set, and the flow advances to step S27r to move the image data to a predetermined file destination.

In step S27s, the data stored in the predetermined position is notified to a subsequent application program to execute necessary processing.

Referring to FIG. 8, a flow of image reading executed in another embodiment of the present invention will be described. The reference numerals quoted in each step are based on FIG.

In step S31, a document to be read is set on the scanner 2 set in the reading mode, and the flow advances to step S32 to read the document.

In step S33, the image data is transferred to the host device 1.

The host device 1 having received the image data transfer from the scanner device corrects the image data based on the correction table 12b in step S34, and proceeds to step S35 to execute the corrected image data. Is displayed on the display unit 16.

In step S36, the operator confirms whether or not to perform additional correction. When an instruction to execute additional correction is obtained, the flow advances to step S37 to perform additional correction.

The detailed flow of executing the additional correction will be described with reference to FIG.

In step S37a, the arithmetic control unit 11 checks the set value of the slice level 12a. Alternatively, the color configuration of the light source color specified to the light emitting unit 22 of the scanner device 2 is confirmed.

In step S37b, the target range of the additional correction is set, and the flow advances to step S37c to proceed to the correction table 12b.
Is additionally corrected. The details of the additional correction of the correction data are as described in the description based on FIGS. 13A and 13B.

In step S37d, it is confirmed with the operator whether fine adjustment of the correction data is to be performed, and if an instruction to execute fine adjustment is obtained, the flow advances to step S37e to generate a fine adjustment value. In step S37f, the correction value is generated. To change. The details of the fine adjustment of the correction data are as described in the explanation based on FIG.

In step S37g, the finely adjusted correction data is stored in the sub-table 12c, and in step S37h
The image data is stored in the sub-table 12c.
The additional correction is performed based on.

Returning to the description of the flow of FIG. Step S3
At step 8, an image obtained by the additional correction is displayed on the display unit 16. At step S39, an instruction from the operator is waited. If the operator determines that additional correction is necessary again, the process returns to step S37.

If the operator determines in step S39 that the additional correction is appropriate, the process proceeds to step S40.

In step S40, the image data is processed in the application program 13, and in step S41, the data processed by the application program 13 is stored in a predetermined location, and the processing ends.

The image data processing executed in step S40 is the same as that in step S27 described with reference to FIG.
6 and FIG. 7.
Has already been described, and a detailed description thereof will be omitted here.

[0125]

According to the present invention, the following effects can be expected.

1) In the control method of the scanner connected to the host device, the difference between the output value generated by reading the reference document for defining the image density in advance and the theoretical value to be output by the scanner is provided. The scanner calculates a value, corrects image data read by the scanner device based on the difference value, and forms a correction table for converting the image data into image data according to a theoretical value to be output by the scanner device.

By taking this means, the image data read by the scanner device is corrected by the correction table, so that the image data is generated while maintaining the theoretical relationship.

2) A correction table for correcting the image data read by the scanner device and converting the image data into image data conforming to the theoretical value to be output by the scanner device is formed in an EEPROM section built in the scanner device. I do.

By taking this measure, the image data read by the scanner device is corrected by the correction table before being transferred to the host device, so that the image data received by the host device is always theoretically accurate data. The effect of configuring is obtained.

3) A correction table for correcting image data read by the scanner device and converting the image data into image data conforming to the theoretical value to be output by the scanner device is built in a host device connected to the scanner device. Driver program.

By adopting this means, the image data read by the scanner device is corrected by a correction table formed in a driver program built in the host device, so that it is possible to easily change the image data by changing the correction value. obtain.

4) The correction table has a sub-table for adjusting the correction values of the correction table and additionally correcting the image data read by the scanner device.

By adopting this means, the image data read by the scanner device is corrected by the sub-table formed in the driver program built in the host device, so that the effect that correction data by additional correction can be easily generated is obtained.

5) The sub-table for additionally correcting the image data read by the scanner device is configured such that the added correction value corresponds to the slice level contained in the driver program.

By taking this means, the image data read by the scanner device is corrected by the sub-table which is adjusted according to the slice level, so that the image data is processed without operating the slice level. The effect is obtained.

6) The sub-table for additionally correcting the image data read by the scanner device has the additional correction value corresponding to the light source color of the light emitting portion of the scanner device.

By adopting this means, the image data read by the scanner device is corrected by the sub-table which is adjusted according to the light source color of the light emitting unit. The effect of processing the image data in accordance with the color composition of the light source is obtained.

7) In the recording medium storing the program for implementing the control method of the scanner connected to the host device, the scanner is made to read in advance a reference document for clarifying the image density and form a correction table. A procedure for converting image data read by the scanner device into image data according to a theoretical value to be output by the scanner device based on the correction table; anda correction value stored in the correction table. And a driver program for executing a procedure for storing an additional correction value for additionally correcting the image data read by the scanner device in the sub-table.

By adopting this means, the scanner device has the effect of maintaining the linearity of the density gradation characteristics of the read image and providing a procedure for correcting the image data according to the application applied to the subsequent stage. .

[Brief description of the drawings]

FIG. 1 is a configuration diagram according to a representative embodiment of the present invention.

FIG. 2 is a configuration diagram according to another representative embodiment of the present invention.

FIG. 3 is a flowchart for creating a correction table.

FIG. 4 is a flowchart for creating a correction table.

FIG. 5 is a flowchart for reading image data.

FIG. 6 is a flowchart at the time of correction data processing.

FIG. 7 is a flowchart at the time of correction data processing.

FIG. 8 is a flowchart for reading image data.

FIG. 9 is a flowchart at the time of executing additional correction.

FIG. 10 is an explanatory diagram of generation of a correction table.

FIG. 11 is an explanatory diagram of generation of a correction table.

FIG. 12 is an explanatory diagram of generation of a correction table.

FIG. 13 is an explanatory diagram of subtable generation.

FIG. 14 is an explanatory diagram of sub-table generation.

FIG. 15 is an explanatory diagram of sub-table generation.

FIG. 16 is a configuration diagram according to a typical embodiment of the prior art.

And FIG. 17 is a flowchart for reading image data according to the related art.

And FIG. 18 is a flowchart at the time of image data processing according to a conventional technique.

And FIG. 19 is a flowchart at the time of image data processing according to a conventional technique.

FIG. 20 is an output diagram according to the related art.

[Explanation of symbols]

 1: Host device 2: Scanner device 11: Operation control unit 12: Driver program 12a: Slice level 12b: Correction table 12c: Sub table 13: Application program 13a: OCR program 13b: Filing program 15: Operation unit 16: Display unit 21 : Arithmetic control unit 22: light emitting unit 23: light receiving unit 24: EEPROM unit 24 a: correction table

Claims (7)

[Claims] In a control method of a scanner device connected to a host device, an output value generated by reading a reference document for clarifying image density by the scanner device (2) and a theory to be output by the scanner device (2) The image data read by the scanner device (2) is corrected based on the difference value, and the scanner device (2) reads the image data in a subsequent image data reading operation. A correction table (24a, 12b) serving as a reference for converting the converted image data into image data conforming to a theoretical value to be output by the scanner device (2). 2. A control method for a scanner device according to claim 1, wherein said image data read by said scanner device is converted into image data conforming to a theoretical value to be output by said scanner device. Correction table (24a)
In the scanner device (2)
The control method for a scanner device according to claim 1, wherein the control method is formed in a section (24). 3. The method for controlling a scanner device according to claim 1, wherein the image data read by the scanner device is converted into image data according to a theoretical value to be output by the scanner device. Correction table (12b)
Is formed in a driver program (12) built in a host device connected to the scanner device (2). 4. The method for controlling a scanner device according to claim 1, wherein the correction table adjusts a correction value of the correction table to read an image read by the scanner device. The method according to claim 3, further comprising a sub-table (12c) for additionally correcting data. 5. The method for controlling a scanner device according to claim 1, wherein the sub-table for further correcting the image data read by the scanner device includes the additional correction value in a driver program. The method according to claim 4, wherein the control is performed in accordance with the slice level (12a). 6. A control method for a scanner device according to claim 1, wherein the sub-table for additionally correcting the image data read by the scanner device includes the additional correction value of the scanner device. The control method for a scanner device according to claim 4, wherein the control unit is configured to correspond to a light source color of the light emitting unit (22). 7. A recording medium storing a program for realizing a control method of a scanner device connected to a host device, wherein the scanner device (2) is caused to read in advance a reference original for clarifying the image density, and a correction table (24
a, 12b), and image data read by the scanner device (2) based on the theoretical values to be output by the scanner device (2) based on the correction table (12b). And a correction value stored in the correction table (12b), and an additional correction value for additional correction of the image data read by the scanner device (2) is stored in the sub-table (12).
c) storing a driver program for executing the steps of: c) storing the driver program.