JP2001326816A - Scanner adjustment value discrimination method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scanner adjustment value discrimination method by which a sheet-feeding or a self-scanning scanner can automatically conduct shading correction. SOLUTION: Data obtained by scanning of a read object while a light source of a scanner read section is put out are compared with a black reference data (step S105), scanning is applied to the read object while the light source of the scanner read section is lighted and data obtained by this scanning are compared with white reference data (step S106), and a warning is given in the case that the comparison result between the data obtained by the scanning and the black reference data or the white reference data indicates deviation over a prescribed range.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scanner adjustment value determining method for determining whether a scanner adjustment value is appropriate.

[0002]

2. Description of the Related Art In a scanner device for taking in image information, if the light amount of a light source is insufficient or an optimal adjustment value for reading an image is lost, it becomes impossible to read an image properly. . Therefore, a conventional scanner generally scans and reads data serving as a reference for white / black as shading correction processing.
It is determined whether the value is within a predetermined range with respect to the white reference data or the black reference data, and if the scan value exceeds an allowable value for the white reference data or the black reference data, a warning is issued. I have to.

However, such a shading correction process is a process generally performed in a flatbed scanner. In other words, in the flatbed type scanner device, the original to be read is placed on the contact glass, and the scanner reading section is moved under the contact glass along the original to scan, thereby causing the original to be illuminated. And irradiates the reflected light to obtain image data from the document. With such a structure, the flatbed type scanner can scan the white / black reference plate when the scanner reading unit moves.

[0004]

On the other hand, as a scanner device having a relatively simple structure, a sheet feeder in which image data of an object to be read is obtained by a scanner reading section in a process of conveying the object to be read. There is a type of scanner device. Further, as a scanner device having a simpler structure, a self-propelled scanner that obtains image data of an object to be read by moving a scanner reading unit that reads image data with respect to the object to be read by operation of a user. There is a device.

However, these sheet-feed type scanner devices and self-propelled scanner devices cannot automatically read the white / black reference plate when the scanner reading unit moves due to their structures. For this reason, when the light amount of the light source is insufficient or the optimal adjustment value for reading an image is lost, there is a disadvantage that it becomes impossible to perform appropriate image reading.

Therefore, conventionally, in these sheet-feed type scanner devices and self-propelled scanner devices, a white / black sheet as a reference for white / black is attached to a product and attached by a user operation. There is a type in which a white / black sheet is scanned and read, thereby performing a shading correction process. However, since such processing is left to the user, shading correction is not performed when necessary, or an operation for shading correction is performed if the user does not have knowledge even if the image data becomes extremely strange. May not be possible.

An object of the present invention is to make it possible to automatically perform shading correction in a sheet feed type scanner.

An object of the present invention is to make it possible to automatically perform shading correction in a self-propelled scanner device.

An object of the present invention is to make it possible to appropriately perform shading correction as the use time elapses.

[0010]

According to a first aspect of the present invention, there is provided a method of determining a scanner adjustment value, wherein a sheet reading type image data of an object to be read is obtained by a scanner reading section in a process of conveying the object to be read. Performing a scanning operation on an object to be read in a state where a light source of the scanner reading unit is turned off, and comparing data obtained by the scanning operation with black reference data; and Performing a scanning operation on the object to be read in a state where the light source is turned on, and comparing data obtained by the scanning operation with white reference data; and data obtained by the scanning operation and black reference data or white reference data. Performing a warning notification when the result of comparison with the value deviates from a predetermined range. Therefore, even in the sheet feed type scanner, the data values to be compared with the black reference data and the white reference data are automatically set without depending on the operation of the operator without forcing the operator to perform the scanning operation of the white / black sheet. can get.

According to a second aspect of the invention, there is provided a scanner adjustment value judging method, wherein a scanner reading section for reading image data with respect to an object to be read is moved by a user operation to obtain image data of the object to be read. Used in a self-propelled scanner device, performing a scanning operation on the object to be read in a state where the light source of the scanner reading unit is turned off, and comparing data obtained by the scanning operation with black reference data; Performing a scanning operation on the object to be read in a state where the light source of the scanner reading unit is turned on, comparing the data obtained by the scanning operation with white reference data, and the data obtained by the scanning operation and the black reference data or Issuing a warning when the comparison result with the white reference data is out of a predetermined range. Therefore, even in the self-propelled scanner device, the operator is not required to perform the scanning operation of the white / black sheet,
The data value to be compared with the black reference data and the white reference data is obtained.

According to a third aspect of the present invention, in the method for determining a scanner adjustment value according to the first or second aspect, a scanning operation for obtaining data to be compared with black reference data or white reference data is performed by using an image of an object to be read. It was done in the process of obtaining data. Therefore, in the process of obtaining the image data of the object to be read, data values to be compared with the black reference data and the white reference data are obtained, and the time required to obtain such data values is reduced. Further, when used in a self-propelled scanner, the operator is not forced to perform only an operation to obtain a data value to be compared with the black reference data and the white reference data. Is obtained.

The invention described in claim 4 is the first to third aspects of the present invention.
The invention of the scanner adjustment value determination method according to any one of
The method further includes a step of obtaining a history of data to be compared with the black reference data or the white reference data, and correcting the black reference data or the white reference data based on the history. Therefore, the black reference data or the white reference data that should be changed with the lapse of the use time is corrected, and the shading correction is appropriately performed with the lapse of the use time.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS.

The present embodiment is applied to a small portable information terminal device 1 capable of scanning a driver's license and issuing a foul notice to issue a foul notice of traffic rule violation. It is an example.

FIG. 1 is a plan view showing the appearance of the information terminal device 1, and FIG.

As shown in FIG. 1, a liquid crystal display 3 as a display section is provided on the front left side of the upper surface of a housing 2 containing a battery (not shown). The liquid crystal display 3 is used for displaying operation instructions and various information. A touch panel 4 is provided on the surface of the liquid crystal display 3. And the housing 2
A keyboard 5 is provided on the right side of the upper surface of the liquid crystal display 3 on the right side of the liquid crystal display 3. Keyboard 5
Keys such as numeric keys and function keys are provided.

As shown in FIG. 2, a printer unit 6 as a printing unit is housed on the inner rear side of the housing 2. A paper feed port 7 for taking in a foul notice as a recording medium into the printer unit 6 is formed on the back surface of the housing 2, and a discharge port 8 for discharging the foul notice is slightly deeper than the center of the upper surface of the housing 2. Side (rear side).
A cutter 9 for cutting continuous paper such as roll paper as a recording medium is provided at an edge of the paper discharge port 8. For this reason, the infringement notice is generally a cut sheet, but as an issuance form of the infringement notice, it may be cut and issued by the cutter 9 using continuous paper.
Further, the information terminal device 1 of the present embodiment can be used not only for printing and issuing a foul notice, but also for printing for other purposes. In such a case, the cutter 9 for cutting the continuous paper is useful.

Above the printer unit 6, a scanner unit 10
Are arranged. A reading object having an image to be read, for example, a slot 11 into which a driver's license is inserted is formed in the vicinity of the paper discharge port 8, and a discharge port 12 from which the reading object such as a driver's license is discharged is provided. , Near the paper feed port 7.

The configuration of the printer section 6 will be described. The printer section 6 mainly includes a thermal head 13 and a platen roller 14. That is, a paper transport path 15 from the paper feed port 7 to the paper output port 8 is provided, and the thermal head 13 and the platen roller 14
Is disposed slightly upstream of the sheet discharge port 8 in the sheet transport direction. A substantially U-shaped bent portion is formed in the paper transport path 15 by using the outer peripheral surface of the platen roller 14. As a result, the recording medium such as the foul notice discharged from the paper discharge port 8 is discharged upward and backward (back side) so as not to cover the liquid crystal display 3 and the keyboard 5, and furthermore, the printing surface is changed. Discharged upward. Here, the paper discharge operation is controlled so that the rear end of the recording medium such as a foul notice is stopped while being bitten by the thermal head 13 and the platen roller 14. As a result, a recording medium such as a foul notice is not dropped.

Next, the configuration of the scanner section 10 will be described. Outlet 1 through insertion section 11 through scanner section 10
A reading transport path 16 leading to 2 is provided. The scanner unit 10 mainly includes a transport roller 17 and a scanner reading unit 18. The transport roller 17 is disposed below the reading transport path 16, and the scanner reading unit 18 is disposed above the scanning transport path 16. The scanner reading section 18 includes an LED and a CCD, and has a configuration in which the LED illuminates the driver's license to be read with the LED and the reflected light is received by the CCD. Here, the reading conveyance path 1
Reference numeral 6 is formed in a substantially straight line so that an image can be read even when the object to be read is as hard as a card made of plastic or the like such as a driver's license. In addition, the terminal end of the reading conveyance path 16 is configured such that an object to be read such as a driver's license discharged from the discharge port 12 does not interfere with a recording medium such as a foul notice inserted into the paper feed port 7 without feeding. It is slightly bent by the guide member 19 so as to be discharged substantially parallel to the direction. Further, the scanner reading unit 18
As shown in FIG. 2, one end is urged to press against the transport roller 17 by the restoring force of a leaf spring 20 fixed to the housing 2.

In the information terminal device 1 of the present embodiment, the paper transport path 15 and the read transport path 16 are arranged close to each other due to the space in the housing 2. Therefore, in the case of such a configuration, the sheet feeding port 7 and the insertion port 11
If they are arranged close to each other, it is expected that a recording medium such as a violation ticket and an object to be read such as a driver's license will be erroneously inserted into the paper feed port 7 and the insertion port 11, respectively. Therefore, in the present embodiment, the insertion port 11 for an object to be read such as a driver's license is located near the discharge port 8, and the paper supply port 7 for a recording medium such as a violation ticket is located near the discharge port 12. By arranging them, even if the recording medium or the object to be read is inserted into the wrong mouth, it is possible to prevent the inconvenience that the recording medium or the object to be read is pulled into the wrong conveyance path as it is.

FIG. 3 is a block diagram showing the electrical connection of each part. First, a CPU 51 for executing various arithmetic processes and centrally controlling each unit is provided, and a ROM 52 and a RAM 53 are connected to the CPU 51 via a system bus. The ROM 52 stores fixed data such as a control program in a fixed manner. Therefore, the ROM 52
Functions as a medium for storing the control program. However, the medium for storing the control program is RO
The storage medium is not limited to M52, and various storage media such as FD, HDD, and various optical media can be used. Then, in the information terminal device 1 of the present embodiment, the CPU 51 controls each unit according to such an operation program, so that the information terminal device 1 executes a desired operation. However, the ROM 52 shown here merely conceptually shows a medium having a function of storing data even when the power is turned off. Therefore, in the ROM 52 here,
For example, a medium such as an EEPROM which stores information in a rewritable manner and stores the stored contents is also included. The RAM 53 stores various variable information in a rewritable manner and is used, for example, as a work area. Further, such a partial area of the RAM 53 is also used as various counter areas. The contents stored in a part of the RAM 53 are backed up by a battery (not shown).

The objects driven and controlled by the CPU 51 according to the control program stored in the ROM 52 include, for example, the liquid crystal display 3, the touch panel 4, the keyboard 5, the printer unit 6, the scanner unit 10, and the interface 54. Therefore, these units are also connected to the CPU 51 via the system bus.

In such a configuration, in the information terminal device 1 according to the present embodiment, when the driver's license is inserted into the insertion port 11, the driver's license is automatically loaded by the transport roller 17 and And in the process,
The content of the driver's license is read by the scanner unit 10 using a scanner. Thereby, information such as a name, a date of birth, and a driver's license number can be obtained. Therefore, not only information input using the keyboard 5 or the touch panel 4 as input information for printing predetermined information by the printer unit 6 on the violation ticket inserted into the paper feed port 7 but also the scanner unit 10 The information read by the scanner is also available.

The information terminal device 1 of the present embodiment as described above
Is executed by the CPU 51 centrally controlling each unit according to the control program stored and stored in the ROM 52.

Here, an outline of the scan reading process by the scanner unit 10 will be described with reference to FIG. First, the presence or absence of a warning is determined (step S101). If there is no warning (N in step S101), a determination process is performed to determine whether the scanner unit 10 has been activated (step S1).
03). Here, the warning determined in step S101 will be described later in detail.

When a driver's license is inserted into the slot 11,
This is detected by a sensor (not shown), and the scanner operation by the scanner unit 10 starts. Therefore, step S10
3 is detected (step S1).
03, Y), a scan operation is performed (step S1)
04). That is, the transport roller 17 is driven to rotate, whereby the image data of the driver's license automatically loaded is taken into the scanner reading unit 18, and the image data output from the scanner reading unit 18 is subjected to predetermined processing by the CPU 51. Is done.

After the scan operation is performed in step S104, a MAX value check process (step S105)
MIN value check processing (step S106) and M
AX value and MIN value save processing (step S107)
Are executed in order. These processes will be described in detail with reference to FIG.

FIG. 5 is a schematic diagram conceptually showing the values of the black reference data and the white reference data in 256 gradations.
First, in the scanner reading unit 18 of the present embodiment, a CCD
Is converted into a digital signal of 256 gradations from 0 to 255. The theoretical value of black data is "255"
, And the theoretical value of the white data is “0”. On the other hand, in the present embodiment, a predetermined value smaller than “255” is set as black target data in the black reference data.
Further, a predetermined value larger than “0” is set in the white reference data as a white target. Here, the reason why the predetermined value smaller than “255” is set as the black reference data and the predetermined value larger than “0” is set as the white reference data is that the black reference data processing of the present embodiment (see FIG. 6). ) And white reference data processing (see FIG. 7), the details of which are described below.

The MAX value check processing executed in step S105 is black reference data processing. FIG.
9 is a flowchart showing the flow of black reference data processing (MAX check processing). In the black reference data processing, the LED in the scanner reading unit 18 is turned off (step S201), and a dummy scan is performed in this state (step S202) to obtain MAX data, that is, data to be compared with the black reference data. (Step S2
03). In this case, the dummy scan may be the whole of one line or a part of one line. Also,
This processing is executed in an area outside the reading area of the driver's license during the scanning operation shown in step S104 of FIG. For example, the dummy scan operation shown in step S202 is executed immediately before the end of the scan operation by the scanner unit 10. Alternatively, as another embodiment, the dummy scan operation shown in step S202
It may be taken in during the processing of step S104 in FIG. 4 and executed immediately after the start of the scanning operation by the scanner unit 10.

When the MAX data is obtained in step S203, the MAX data is compared with black reference data as a black target (step S204). In this case, if it is determined that the MAX data is larger than the black reference data (Y in step S204), it means that the optimal adjustment value for reading the image has been lost, and thus it is abnormal. An alert is issued (step S
207). On the other hand, when it is not determined that the MAX data is larger than the black reference data (step S2).
(N of 04), since there is no abnormality at this point, the process proceeds to the next process. As the next process, it is determined whether or not the acquired MAX data is within a predetermined range (step S20).
5). Specifically, it is determined whether or not a value obtained by subtracting the value of MAX from the black reference data as the black target does not exceed a determination value that defines a predetermined range. As a result, when it is determined that the acquired MAX data is out of the predetermined range (Y in step S205), the light amount of the light source is insufficient or the optimal adjustment value for reading the image is broken. Therefore, a warning notification indicating an abnormality is issued (step S207). In contrast,
When it is not determined that the acquired MAX data is out of the predetermined range (N in step S205), normal processing is performed because there is no abnormality (step S206).

Here, the normal process executed in step S206 is a process in which the CPU 51 recognizes that the scan read data is normal with respect to the black reference data. On the other hand, the abnormal processing executed in step S207 is that the CPU 51 recognizes that the scan read data is abnormal with respect to the black reference data,
As a result, the CPU 51 controls the driving of the liquid crystal display 3 and causes the liquid crystal display 3 to output a display indicating an abnormality.

As described above, in this embodiment, the LED in the scanner reading section 18 is turned off (step S20).
1) By executing a dummy scan in this state (step S202), MAX data to be compared with the black reference data is obtained. For this reason, the value obtained by the dummy scan is not completely black, and it is inappropriate to represent the value with the number of gradations of “255”. Here, in the present embodiment,
There is a reason to set a predetermined value smaller than "255" as black reference data.

Next, M executed in step S106
The IN value check processing is white reference data processing. FIG. 7 shows white reference data processing (MIN check processing).
It is a flowchart which shows the flow. First, scan reading is performed by the scanner unit 10 to obtain MIN data. In this case, scan reading may be performed for the entire line or a part of the line. In addition, the processing is executed in the white portion of the driver's license during the scanning operation shown in step S104 of FIG. For example, the scanning operation for acquiring the MIN data shown in step S301 is performed immediately before the end of the scanning operation by the scanner unit 10. Alternatively, as another embodiment, the scan operation for acquiring the MIN data shown in step S301 is fetched during the process of step S104 in FIG. 4 and is executed immediately after the start of the scan operation by the scanner unit 10. You may do it.

When the MIN data is obtained in step S301, the MIN data is compared with white reference data as a white target (step S302). In this case, if it is determined that the MIN data is smaller than the white reference data (Y in step S302), it means that the optimal adjustment value for reading the image has been lost, and thus it is abnormal. An alert is issued (step S
305). On the other hand, if it is determined that the MIN data is larger than the white reference data (N in step S302), there is no abnormality at this point, and the process proceeds to the next process.
As the next process, it is determined whether or not the acquired MIN data is within a predetermined range (step S303).
Specifically, it is determined whether or not a value obtained by subtracting white reference data as a white target from the value of MIN does not exceed a determination value that defines a predetermined range. As a result, when it is determined that the acquired MIN data is out of the predetermined range (Y in step S303), the light amount of the light source is insufficient, or the optimal adjustment value for reading the image is broken. Therefore, a warning notification indicating an abnormality is issued (step S305). On the other hand, when it is not determined that the acquired MIN data is out of the predetermined range (N in step S303), normal processing is performed because there is no abnormality (step S304).

Here, the normal process executed in step S304 is a process in which the CPU 51 recognizes that the scan read data is normal with respect to the white reference data. On the other hand, the abnormal processing executed in step S207 is that the CPU 51 recognizes that the scan read data is abnormal with respect to the white reference data,
As a result, the CPU 51 controls the driving of the liquid crystal display 3 and causes the liquid crystal display 3 to output a display indicating an abnormality.

As described above, in this embodiment, the driver's license, which is the actual object to be read, is scanned and read, and MIN data to be compared with the white reference data is obtained (step S301). In other words, what is scanned and read at the time of shading correction is not the pure white sheet but the white portion of the driver's license. For this reason, compared to pure white,
The brightness is slightly inferior. Here, in the present embodiment,
There is a reason to set a predetermined value larger than “0” as the white reference data.

As described above, in the present embodiment, even with a sheet-feed type scanner, comparison with the black reference data and the white reference data is performed without forcing the operator to perform the scanning operation of the white / black sheet. The data value to be obtained is automatically obtained regardless of the operation of the operator. Therefore, it is possible to simplify the operation and optimize the image data scanned and read.

Here, in the present embodiment, as the process of step S107 in FIG. 4, a save process (step S107) of the MAX value obtained in step S105 and the MIN value obtained in step S106 is executed. The save in this case is performed, for example, by using the EEPROM 52 in the ROM 52.
This is performed in the M area or the backup storage area in the RAM 53. The save process in step S107 means a log acquisition process as a history. Specifically, in the present embodiment, the MAX value and M
The IN value is saved. Then, the saved MAX value and MIN value are used for correction processing of black reference data as a black target and white reference data as a white target. In such a process of correcting the black reference data and the white reference data, an average value of the MAX values of the past 50 times and an average value of the MIN values of the past 50 times are obtained, and the average values are replaced with the black reference data and the white reference data. This is the process.
Hereinafter, this processing will be described in more detail with reference to FIG.

FIG. 8 is a schematic diagram for explaining the reference data correction processing. In FIG. 8, "A" means a value handled by the apparatus of the present embodiment as black reference data or white reference data, and "x" indicates M actually obtained by scan reading.
It means AX data or MIN data. In the present embodiment, the history of the actually obtained MAX data or MIN data represented by “x” is collected, for example, in the past 50 times, and the average value is used as black reference data or white reference data indicated by “A”. . On the other hand, if the MAX data or MIN data actually obtained for the black reference data or the white reference data deviates greatly, such data is considered to be a flock and should not be adopted as a history. ing. In FIG. 8, “B” indicates a maximum range value adopted as history for black reference data or white reference data, and “C” indicates a minimum range value adopted as history for black reference data or white reference data. Indicates the value. And
As is clear from FIG. 8, the black reference data or white reference data indicated as “A” decreases with the passage of time (in FIG. 8, time progresses toward the right side). This is because the LED, which is a light source in the scanner unit 10, causes a decrease in light amount due to deterioration with time. However,
When the light amount of the LED falls below a certain value, it is impossible to perform proper scan reading only by another adjustment method. Therefore, as shown in FIG. 8, a determination criterion is provided, and when the black reference data or white reference data indicated as “A” falls below the determination criterion, the value is set as the black reference data or white reference data. The processing of not handling is performed. As described above, in the present embodiment, the history of the data compared with the black reference data or the white reference data is obtained, and the black reference data or the white reference data is corrected based on the history. Thus, the black reference data or the white reference data that fluctuates can be corrected, and the shading correction can be appropriately performed as the use time elapses.

Next, as another embodiment, an operation program for performing the above-described shading correction processing may be realized by a self-propelled scanner device. In this case, the processing corresponding to the processing shown in FIGS. 4, 6, and 7 can be directly executed as the processing for shading correction. The self-propelled scanner device has the same operation and effect as the present embodiment.

[0043]

According to a first aspect of the present invention, there is provided a sheet feed type scanner device in which a scanner reading unit obtains image data of an object to be read in a process of conveying the object to be read. A scanning operation of the object to be read with the light source of the scanner reading unit turned off, a step of comparing data obtained by the scanning operation with black reference data, and turning on a light source of the scanner reading unit. Performing a scanning operation on the object to be read in a state where the scanning operation is performed, and comparing data obtained by the scanning operation with white reference data; and a comparison result between the data obtained by the scanning operation and black reference data or white reference data. Performing a warning notification when the value is out of a predetermined range. Also, the data values to be compared with the black reference data and the white reference data can be automatically obtained without forcing the operator to perform the scanning operation of the white / black sheet, regardless of the operation of the operator. And optimizing scan-read image data.

According to a second aspect of the invention, there is provided a scanner adjustment value judging method wherein a scanner reading section for reading image data with respect to an object to be read is moved by a user operation to obtain image data of the object to be read. Used in a self-propelled scanner device, performing a scanning operation on the object to be read in a state where the light source of the scanner reading unit is turned off, and comparing data obtained by the scanning operation with black reference data; Performing a scanning operation on the object to be read in a state where the light source of the scanner reading unit is turned on, comparing the data obtained by the scanning operation with white reference data, and the data obtained by the scanning operation and the black reference data or Performing a warning notification when the comparison result with the white reference data is out of the predetermined range. Also in the canner device, the data value to be compared with the black reference data and the white reference data can be obtained without forcing the operator to perform the scanning operation of the white / black sheet, so that the operation is simplified and the scanned image is read. Data can be optimized.

According to a third aspect of the present invention, in the method for determining a scanner adjustment value according to the first or second aspect, a scanning operation for obtaining data to be compared with black reference data or white reference data is performed by using an image of an object to be read. Since the process is performed in the process of obtaining the data, in the process of obtaining the image data of the object to be read, the data value to be compared with the black reference data and the white reference data can be obtained. And further simplification of the operation can be achieved. Further, when used in a self-propelled scanner device, the operator is not forced to perform an operation only to obtain a data value to be compared with the black reference data and the white reference data.
In this aspect, the operation can be further simplified.

The invention described in claim 4 is the first to third aspects of the present invention.
The invention of the scanner adjustment value determination method according to any one of
The method further includes a step of obtaining a history of data to be compared with the black reference data or the white reference data, and correcting the black reference data or the white reference data based on the history. The reference data or the white reference data can be corrected, and the shading correction can be appropriately performed as the use time elapses.

[Brief description of the drawings]

FIG. 1 is a plan view of a small portable information terminal device having a scanner device function according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional side view thereof.

FIG. 3 is a block diagram of electrical connection of each unit.

FIG. 4 is a flowchart illustrating an outline of a scanning process.

FIG. 5 is a schematic diagram conceptually showing values of black reference data and white reference data in 256 gradations.

FIG. 6 is a flowchart showing a flow of black reference data processing (MAX check processing) in FIG. 4;

FIG. 7 is a flowchart showing a flow of white reference data processing (MIN check processing) in FIG. 4;

FIG. 8 is a schematic diagram for explaining reference data correction processing.

[Explanation of symbols]

 18 Scanner reading unit

Continued on the front page F term (reference) 5B047 AA01 BA01 BB02 BC18 CB04 DA04 DC01 DC07 5C062 AA02 AA05 AB17 AC22 AC56 AF15 5C072 AA01 BA08 DA12 EA05 FB12 LA15 RA16 UA02 5C077 LL04 LL11 MM20 MM27 PP06 SS07 PP03 SS03

Claims (4)

[Claims] 1. A state in which a light source of the scanner reading unit is turned off, which is used for a sheet feed type scanner device in which a scanner reading unit obtains image data of the reading target during a process of transporting the reading target. Performing a scanning operation on the object to be read, comparing the data obtained by this scanning operation with black reference data, and performing a scanning operation on the object to be read with the light source of the scanner reading unit turned on. A step of comparing the data obtained by the scanning operation with the white reference data; and a step of giving a warning when the comparison result between the data obtained by the scanning operation and the black reference data or the white reference data is out of a predetermined range. And a scanner adjustment value determination method comprising: 2. A self-propelled scanner device which obtains image data of an object to be read by moving a scanner reading unit for reading image data with respect to the object to be read by operation of a user; Performing a scanning operation on the object to be read with the light source of the reading unit turned off, comparing data obtained by the scanning operation with black reference data; and reading with the light source of the scanner reading unit turned on. Performing a scanning operation on the object and comparing the data obtained by the scanning operation with the white reference data; and comparing the data obtained by the scanning operation with the black reference data or the white reference data to determine a predetermined range. Performing a warning notification when it deviates. 3. The scanner adjustment value determination according to claim 1, wherein a scan operation for obtaining data to be compared with the black reference data or the white reference data is performed in a process of obtaining image data of a reading target. Method. 4. The method according to claim 1, further comprising the step of obtaining a history of data to be compared with the black reference data or the white reference data, and correcting the black reference data or the white reference data based on the history. A method for determining a scanner adjustment value according to claim 1.