JP2015097407A - Method for adjusting scanner and the scanner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for improving the movement of an image sensor adjusted by a control system, when the control system is easily affected by temperature, humidity, air pressure, light, or the like.SOLUTION: In a method for adjusting a scanner for scanning a document placed on a platen, the scanner includes the image sensor and a light source for emitting light and repeatedly executes a step for moving the image sensor line by line, to scan the document and additionally, a step 203 for moving the image sensor with a resolution of one pixel or less, to store a scan image and determining whether or not a difference between an actual scanning position and a predetermined scanning position is less than a predetermined value, and a step 204 for correcting a movement amount according to the difference.

Description

  The present invention relates generally to optical scanning. More particularly, the present invention relates to a method for adjusting a scanner to scan a document.

  U.S. Pat. No. 6,647,099 discloses a method based on the corner of a document being scanned on a transparent platen with the document image facing down. The platen defines the XY coordinate system. As the line of light moves in the Y direction, the line of light moves in the X direction as the line of light moves line by line, illuminating the document image line by line. Thus, the line of light reflected from the document is detected by a linear CCD array having a number of individual sensor cells arranged in a line that extends in the X direction and coincides with the line of light. A plurality of fiducial marks implemented on one or more reflective targets are placed at known positions relative to the platen and / or the reference corner of the document so that they are scanned prior to scanning the document. When the fiducial mark is detected, the physical position of the CCD sensor array in the X direction with respect to the fiducial corner and the orientation of the platen with respect to the CCD array and the light line can be accurately determined. Indexing the orientation of the platen can include indexing the displacement of the platen relative to the CCD array and the line of light, and indexing the direction of travel of the carriage supporting the CCD array and the orthogonality of the platen relative to the line of light. .

  US Patent Application 2005/0073728 discloses a CCD array image sensor fixed on a Y-direction stage supported on an X-direction stage. When the piezoelectric drive circuit supplies a voltage to the X direction piezoelectric element and the Y direction piezoelectric element, the CCD image sensor moves in the X direction and the Y direction. The X direction position sensor and the Y direction position sensor detect the position information of the CCD image sensor in the X direction and the Y direction, respectively, and send the position information to the piezoelectric drive circuit. The piezoelectric drive circuit sets the target movement of the CCD image sensor and detects the actual movement of the CCD image sensor from the position information. The piezoelectric drive circuit adjusts the output voltage to the X-direction piezoelectric element and the Y-direction piezoelectric element so that the movement of the target is the same as the actual movement. Thus, all scan positions are predetermined and fixed with respect to the scanner, and these scan positions are the same each time a new image is scanned.

U.S. Patent No. 6470099 US Patent Application No. 2005/0073728

  When the control system is sensitive to temperature, humidity, pressure, light, etc., it remains a problem to provide a way to improve the movement of the image sensor coordinated by the control system.

A method for adjusting a scanner for scanning a document is disclosed, the scanner comprising an image sensor and a light source for emitting light, the method comprising:
a) moving the image sensor with a movable mechanical member to place the image sensor at a predetermined scanning position;
b) determining the difference between the actual scan position and the predetermined scan position;
The method further includes determining a difference between the actual scan position and the predetermined scan position by detecting radiation from at least one fixed point having a fixed position relative to the image sensor.

  Therefore, there is an advantage that the position of the image sensor of the optical scanner can be constantly adjusted when the moving system of the scanner is affected by temperature, light, humidity, atmospheric pressure and the like. The position of the image sensor can be determined and is configured to adjust for each scanning position depending on the difference between the predetermined scanning position and the actual scanning position.

  Thus, it may be difficult or even impossible to accurately position the image sensor while scanning, but fixed to adjust the movement and position of the image sensor for scanning each image portion or strip. Since points are used, it is an advantage of this method that continuous adjustment of the image sensor position is possible. Therefore, since the image sensor adapts and obtains its position, there is an advantage that the image sensor is automatically adjusted and the movement of the image sensor is adaptive.

  Furthermore, there is an advantage that the same unit can be used for scanning and adjustment. This is a case where the image sensor detects a signal from a fixed point separately from the detection of incident light reflected from the document.

  There is an advantage that the fixed point functions as a reference point for estimating the position of the image sensor.

  Furthermore, each image portion, i.e. a strip of the original, is scanned in the scanning process, and the movement and positioning of the image sensor is an iterative process. The document is scanned by scanning a plurality of image portions or strips from which the document can be divided, and then the digital image of the document is completed when all the image portions or strips are scanned.

  The predetermined scanning position can be obtained from the preceding scanning position.

  When the position of the image sensor is not accurate with respect to the desired position, there is the advantage that the difference or distance from the desired position can be calculated and the movement of the image sensor can be corrected for this. Therefore, although the image created by the image sensor under such conditions is an accurate image, the position where the image is viewed is not the desired position, and the present method provides a solution to solve this. .

  In addition, when performing measurements, adjustments and corrections according to the method, there is the advantage that inexpensive materials can be used for the scanner while still obtaining precise and accurate measurements.

  It is an advantage of this method that the scanner can be continuously operated and driven while performing the adjustment, whether or not the document is scanned. Before scanning the document, the scanner performs a rough pre-adjustment, and when the document is scanned, the actual scanning and adjustment is performed simultaneously or alternately.

  Furthermore, some embodiments according to the method have the advantage that the resolution of the digital image of the document is improved.

  In some embodiments, the method includes scanning the original to convert it to a digital image by detecting light incident on the image sensor, where the light is emitted from the light source and reflected from the original. The image sensor further includes a step of providing a plurality of light sensors.

In some embodiments, the method comprises:
c) further comprising scanning a portion of the document at the scan position and storing a digital image of said portion of the document.

In some embodiments, the method comprises:
The method further includes a step of repeating steps a) to c) until scanning of the document is completed.

  In some embodiments, the method includes that when scanning of the document is complete, the digital image of the document consists of a plurality of digital images of the scanned portion of the document. The advantage of this embodiment is that by combining or splicing all of the scanned image portions or strips of the document, the portion of each image or strip center can be used where the resolution is highest. That is, the digital image of the obtained document can be a high-resolution image.

In some embodiments, at least one fixed point is configured on the glass plate on which the document is placed for scanning.
The advantage of this embodiment is that by placing or configuring a fixed point on the scanner glass plate, the fixed point has a fixed position relative to other parts or units of the scanner, thereby Can be adjusted for. Therefore, the fixed point is a reference point in the scanner, and thereby the positioning of the image sensor can be performed.

In some embodiments, at least one fixed point is
-A stitch wire;
-A metal member;
-A radiation point;
-A point light source;
-An infrared mark;
− Patterns,
-Selected from the group comprising grooves.

  In some embodiments, the radiation from at least one fixed point is reflected radiation.

  In some embodiments, the radiation is electromagnetic radiation.

  In some embodiments, the radiation is light.

  In some embodiments, the radiation is visible light.

  In some embodiments, detection of radiation from at least one fixed point is performed by receiving radiation with at least one redundant light sensor, which is used for generating a digital image of the document. Defined as not used. The advantage of this embodiment is that a redundant light sensor is used to detect the fixed point, which is the light used for scanning and detecting the fixed point, i.e. for adjusting the movement of the image sensor. Since it is not the same as the sensor, the detection of the fixed point therefore does not affect the scanning and imaging of the document.

In some embodiments, at least one redundant light sensor is
-An image sensor;
-Placed on a device selected from the group comprising a second sensor.
The advantage of this embodiment is whether there is enough space in the image sensor for redundant photosensors, or whether the fixed point radiation is light that the image sensor can detect. Depending on the situation, it is possible to place redundant photosensors in the image sensor or another second sensor.

In some embodiments, the second sensor is
-Movable mechanical parts;
-Attached to a device selected from the group comprising image sensors.
An advantage of this embodiment is that the second sensor, on which a redundant light sensor can be placed, can be attached to a movable mechanical member that moves the image sensor or to the image sensor itself.

In some embodiments, the one or more image sensors, the second sensor, and the movable mechanical member are fixedly attached to each other.
The advantage of this embodiment is that if there is a second sensor, the second sensor, the image sensor and the movable mechanical member can all be attached to each other so that (they are movable relative to each other) If this is the case, the calculation of the movement of the image sensor may be complicated).

In some embodiments, the second sensor is
-An image sensor;
− An infrared (IR) sensor;
In some embodiments, the predetermined scan position is determined by identifying the position of the image sensor relative to at least one fixed point, and when scanning a portion of the document, the digital image of the portion of the document has the highest resolution. Will be brought in. The advantage of this embodiment is that the resolution of the image portion is improved. Selected from the group comprising far infrared (FIR) sensors.
The advantage of this embodiment is that the second sensor can detect different types of radiation, such as light, visible light, infrared, far-infrared, etc., so that the fixed point emits different types of radiation. That's good. However, the image sensor can also detect, for example, infrared radiation, far infrared radiation, and the like.

  In some embodiments, the predetermined scan position is determined by identifying the position of the image sensor relative to at least one fixed point, and when scanning a portion of the document, the digital image of the portion of the document has the highest resolution. Will be brought in. The advantage of this embodiment is that the resolution of the image portion is improved.

In some embodiments, the movable mechanical member is
-Voltage means;
-An actuator;
-A piezoelectric motor;
-A resonant circuit;
-A vibration motor;
-Magnetic means;
It is moved using means selected from the group comprising solenoids;
The advantage of this embodiment is that the movable mechanical member can be moved by various means and the movement by these means can be accurate and precise.

  In some embodiments, the step of determining the difference between the scan position and the predetermined scan position is performed by optical feedback. The advantage of this embodiment is that optical feedback can be accomplished using materials that are fast, accurate, and inexpensive.

  In some embodiments, determining the difference between the actual scan position and the predetermined scan position includes comparing the actual scan position coordinates to the predetermined scan position coordinates.

  In some embodiments, if the difference is greater than or equal to a predetermined threshold, a sequential substitution method is performed. The advantage of this embodiment is that if the actual scanning position and the predetermined scanning position are not equal within a tolerance, that is, if the difference between the two positions is greater than or equal to a predetermined threshold, the two positions are not equal. A calculation is performed to calculate the next scan position as defined and to correct the difference and take into account the error. In this way, the sequential substitution method is performed.

  In some embodiments, the sequential substitution method includes calculating a correction amount. The advantage of this embodiment is that in performing the correction amount calculation, the difference is taken into account when calculating the next scan position, thereby optimizing the movement of the image sensor.

In some embodiments, the method comprises:
Performing a correction amount calculation based on the determined difference between the first actual scanning position and the first predetermined scanning position to determine a second predetermined scanning position;
Adjusting the movement of the image sensor to position the image sensor at the second predetermined scanning position.

In some embodiments, the image sensor is
-A linear array of light sensors;
-A plurality of optical sensors arranged displaced relative to each other;
-CCD image sensor,
A CMOS image sensor;
-Selected from the group comprising CIS image sensors.

In some embodiments, the scanner is
-A large scanner;
-A roller scanner;
-Selected from the group comprising a flatbed scanner.

  In some embodiments, the method further includes repeating steps a) -b) until the difference between the scan position and the predetermined scan position is less than a predetermined value.

  In some embodiments, the optical scanning of the document is adapted to start when the difference between the actual scan position and the predetermined scan position falls below a predetermined value.

  The above two embodiments relate to adjusting the scanner prior to document scanning. Prior to document scanning, the scanner adjusts the position of the image sensor so that the image sensor is positioned at a distance defined sufficiently close to the document scanning to be performed. As long as the difference or distance between the actual scanning position of the image sensor and the first predetermined scanning position is too large or larger than the predetermined value, scanning of the document is not started and no image is stored Only the adjustment of the image sensor is continued. However, as soon as the distance between the actual scanning position of the image sensor and the first predetermined scanning position falls below a predetermined value, then actual image scanning is then started and the image is stored. The advantage of this embodiment is that image scanning and image storage are performed only if the difference or distance between the actual scanning position and the predetermined scanning position of the image sensor is sufficiently small, This saves time and storage when scanning because only the image used for the resulting image can be stored. The quality of the scanned image can be better when imaging is performed only when the actual scan position of the image sensor is within a predetermined value range of the predetermined scan position.

In some embodiments, the method comprises:
-Performing a correction amount calculation based on the determined difference between the first actual scanning position and the first predetermined scanning position to determine a second predetermined scanning position;
Adjusting the movement of the image sensor to position the image sensor at the second predetermined scanning position.

  The present invention relates to various aspects, including the methods described above and below, and corresponding devices, applications, and / or product means, each of which is described in relation to the first mentioned aspect. Each of the embodiments described in relation to the first mentioned aspect and / or the embodiments disclosed in the appended claims. It has one or more corresponding embodiments.

Specifically, this specification discloses a scanner for scanning an original,
-An image sensor;
-A light source for emitting light;
A movable mechanical member for moving the image sensor to position the image sensor at a predetermined scanning position;
-Means for determining the difference between the actual scanning position and the predetermined scanning position;
-Means for detecting radiation from at least one fixed point having a fixed position relative to the image sensor in order to determine the difference between the actual scanning position and the predetermined scanning position;

  The above and / or additional objects, features and advantages of the present invention will become more apparent from the following non-limiting detailed description of embodiments of the present invention, with reference to the accompanying drawings.

It is a figure which shows the Example of the mechanism of a scanner. It is a figure which shows the Example of the mechanism of a scanner. 2 is a flow diagram showing a process preceding scanning. 6 is a flowchart showing a process during scanning.

  In the following description, reference is made to the accompanying drawings, which illustrate by way of example how the invention may be practiced.

  FIG. 1a shows one embodiment of the scanner mechanism. The scanner 100 includes a light source 101 for illuminating a document 102 such as a document. An original 102 is placed on a glass plate or platen 103 for scanning. Light from the light source 101 strikes the original 102 and is reflected as reflected light 104. An image sensor 105 including a plurality of optical sensors 106 detects reflected light 104 incident from the document 102, and the reflected incident light 104 is converted into a digital image of the document. The reflected light 104 passes through an optical element 107 such as a lens. The image sensor 105 is configured to move in one or more directions to position the image sensor 105 at a predetermined position relative to the glass plate 103 and / or the fixed point 110, a pre-calculated position, or a desired position. Attached to the movable machine member 108.

  The movable mechanical member may be moved by voltage difference, actuator, piezoelectric motor, resonant circuit, vibration motor, magnetic means, solenoid and / or the like.

  In order to generate a complete digital image of the entire document, the image sensor scans the document by scanning a portion of the document at a time and stores an image of each part, and as a result, when the entire document is scanned, The resulting digital image of the original consists of a single image of each part of the original. Each digital image of each part of the document may be stored in a processing unit and / or the like.

  For each part of the document that the image sensor will scan, the image sensor must move so that it is accurately positioned with respect to each part of the document. Because scanning is sensitive to temperature, light, humidity, pressure, etc., image sensors and scanners can be affected by these parameters, but these effects can be affected at any location where the image sensor is actually located. This can be taken into account by measuring whether a part is being scanned and then comparing this actual position to a predetermined or desired position. The desired or predetermined scan position can be determined by identifying the position of the image sensor relative to the scanner's fixed point 110, and scanning a portion of the document will provide the highest resolution for the digital image of that portion of the document. Will be brought.

  When comparing the actual position, i.e. the actual scanning position, with the desired or predetermined scanning position, the difference or distance between these two positions is, for example, the (x, y) coordinates of the actual scanning position, i.e. It can be found by comparing the coordinate positions in the two directions with the coordinates of a given scanning position.

  For example, if this difference is greater than or equal to a predetermined threshold, a sequential substitution method can be performed. The sequential substitution method may be performed by an integrator, which is a device configured to perform integration of mathematical operations. Alternatively and / or in addition, the sequential substitution method may be performed by a servo mechanism, servo drive or servo motor that is an automatic device configured to use error detection feedback to correct the performance of the mechanism. . The feedback or error correction signal can assist in controlling the mechanical position. The servo mechanism can provide position control and may operate on the principle of negative feedback, where the control input is compared to the actual position of the mechanical system as measured by some kind of transducer at the output. Some difference (the “error signal”) between the actual value and the target value is amplified and can be used to drive the system in the direction necessary to reduce or eliminate the error. The servo drive can generate movement proportional to the command signal. The command signal can represent a desired speed, and a speed sensor attached to the servo motor may report the actual speed of the motor returned to the servo drive. The servo drive may then compare the actual motor speed with the commanded motor speed and then change the voltage frequency to the motor to correct any error in speed. Thus, the servomechanism, servomotor or servo drive can monitor the feedback signal and continually adjust for deviations from the expected movement, ensuring the accuracy of the commanded movement. Alternatively and / or in addition, the sequential substitution method may be, for example, Newton's method, which is a method of continuously finding better approximations. The sequential substitution method can include calculation of the correction amount of the scanning position for obtaining the second predetermined scanning position, and the calculation of the correction amount can be performed by, for example, the first actual scanning position and the first predetermined scanning position. Performed based on the determined difference between positions. The movement of the image sensor is then adjusted to place or position the image sensor at a second predetermined scanning position.

  The process then scans the entire document, for example, for the third, fourth, fifth, sixth, etc. positions, ie for all parts of the document, and the resulting digital image is complete. Repeat until.

  The target position of the image sensor 105 is obtained based on optical feedback. Optical feedback is accomplished by detecting reflected light 109 from the fixed point 110. The fixing point 110 is disposed on the glass plate 103, and the fixing point 110 may be, for example, a stitch wire, a metal member, a radiation point, a point light source, an infrared mark, a pattern, a groove, and / or the like. The redundant optical sensor 111 detects the reflected light 109 from the fixed point 110. Redundant photosensors are not used to generate a digital image of a document. In FIG. 1 a, redundant photosensor 111 is placed on image sensor 105 along with a plurality of photosensors 106. There may be one or more redundant sensors used to scan a fixed point.

  Multiple optical sensors for the image sensor 105 to detect reflected light 104 from the original 102 to generate a digital image of the original 102 when the image sensor has excess, excess, residual and / or excess of optical sensors This mechanism comprising both 106 and a redundant light sensor 111 for performing optical feedback may be used, the one or more light sensors being used to generate a digital image of the document. Is not used. This is the case, for example, when a scanner has multiple image sensors and these two or more image sensors are displaced with respect to each other, for example, so that there is an overlap between, for example, two photosensors covering the same area. Could be.

  FIG. 1 b is similar to FIG. 1 a, except that the redundant photosensor 111 is not located on the image sensor 105 but on the second sensor 112.

  The image sensor 105 includes only a plurality of optical sensors 106 for detecting the reflected light 104 from the original 102 in order to generate a digital image of the original 102, and the second sensor 112 performs optical feedback. This mechanism with redundant optical sensors 111 is an image sensor 105, that is, all of the optical sensors 106 are used to create a digital image of the document, thereby being used for optical feedback. Can be used when there is no surplus, excess, residue and / or excess of light sensors. This is the case when the optical sensor 106 in the image sensor 105 is, for example, a straight line, such as when the print resolution is, for example, 600 dpi and corresponds to, for example, an image sensor configured to scan an A4 or A3 document size. This may be the case where there is no extra light sensor, arranged in an array.

  As one example, visible light can be used to generate a digital image of the document, and then the second sensor 112 is an infrared (IR) sensor that detects, for example, infrared light from a fixed point 110 It can be. Therefore, in this embodiment, the second sensor 112 can detect infrared light, and the image sensor cannot detect infrared light from a fixed point. Alternatively and / or in addition, the image sensor can detect infrared light, far infrared light, and the like. Alternatively and / or in addition, the second sensor can be an optical image sensor that can detect visible light, such as image sensor 105, or far infrared (FIR) that can detect long wavelength infrared radiation. It can be a sensor.

  The image sensor 105 can be a linear array of photosensors, a plurality of photosensors configured to be displaced relative to each other, a CCD image sensor, a CMOS image sensor, a CIS image sensor, and / or the like.

  The scanner can be a large scanner, a roller scanner, a flatbed scanner and / or the like.

  The movable mechanical member 108 is configured to move in one or more directions, and the movement or movement may be in the range of about 2 micrometers. However, it is understood that the movement of the mechanical member 108 may be smaller or larger. A movable mechanical member 108 scans the document 102 at various positions, thereby moving the image sensor 105 to detect various portions or intervals of pixels. When pixels from various parts of the document are detected and / or stored, the resolution of the digital image of the document is improved.

  FIG. 2 is a flow diagram illustrating a process for adjusting the position of the image sensor prior to document scanning. First, a coarse and coarse adjustment of the scanner and image sensor positions is performed before the document is placed on the scanner for scanning.

  In step 201, the image sensor is moved so as to be positioned at a predetermined scanning position. The predetermined scanning position may be obtained based on the previous scanning position. In step 202, for example, the scanner's fixed point on the scanner's glass plate is scanned at the scan position where the image sensor has moved. The fixed point may be scanned using an image sensor or a second sensor. At step 203, it is determined whether the difference or distance between the actual scanning position and the predetermined scanning position is less than a predetermined value or distance. In step 204, when the difference between the actual scan position and the predetermined scan position is greater than or equal to a predetermined value, ie, distance, the physical to be moved to position the image sensor at the predetermined scan position at the next scan position The distance is determined and the change in the correction amount of the scanning position is calculated in order to find the next predetermined scanning position. In step 205, when the difference between the actual scan position and the predetermined scan position is less than a predetermined value or distance, the image sensor is defined as ready to perform actual scanning on the document. .

  Thus, the first, preliminary, rough adjustment is performed by the redundant light sensor receiving a signal, for example visible light, infrared light, etc., from a fixed point placed on the glass plate of the scanner, for example. The Thereby, optical feedback is obtained, and the image sensor is roughly adjusted by this optical feedback. When a rough pre-adjustment is acceptable within the threshold, the scanner is ready to perform the actual scanning of the document.

  FIG. 3 is a flow diagram illustrating the process during scanning. In step 301, the image sensor is moved so as to be positioned at a predetermined scanning position. In step 302, the document and the fixed point are scanned at the scanning position where the image sensor has moved. A part of the document is scanned by the optical sensor of the image sensor, and the fixed point is scanned by the redundant optical sensor. In step 303, it is determined whether or not the document scanning is completed. If scanning of the document is not completed at step 304, a distance to move the image sensor is determined in order to position the image sensor at the next predetermined scanning position. This distance can be obtained by calculating the correction amount of the scanning position. This process is then continued, such as by repeating step 301 where the image sensor is moved. If scanning of the document is complete, the process is stopped at step 305.

  In this manner, the image sensor scans the document one by one until the entire document is scanned and digitally stored. When the first image portion or strip is scanned, the image sensor moves to the next position, scans the next image portion or strip, and so on until the entire original is scanned.

  Fine or fine adjustment of the position and movement of the image sensor for each position where a portion or strip of the image is scanned and stored is also a fixed point on the glass plate of the scanner plate and the redundancy of the image sensor or second sensor This is accomplished by optical feedback performed by an optical sensor.

  An image sensor should ideally scan each individual image portion or strip at a particular respective location. However, due to temperature, humidity, etc., the image sensor may not be able to find the correct position accurately or precisely. Thus, fine or fine adjustment is performed simultaneously with the scanning of each image portion, so that the actual position of the image sensor can be compared with the ideal position, and the actual position and the ideal position can be compared. The deviation between the two is calculated to calculate the correction amount of the scanning position. As a result, the movement of the image sensor to the next scanning position is adjusted according to this deviation.

  While several embodiments have been described and shown in detail, the present invention is not so limited and may be practiced otherwise in the scope of what is defined in the following claims. In particular, it should be understood that other embodiments may be utilized and functional and structural changes may be made without departing from the scope of the invention.

  In the device claim enumerating several means, several of these means can be embodied by one and the same element of hardware. The mere fact that certain measures are recited in mutually different dependent claims or described in different embodiments does not indicate that a combination of these measures cannot be used to advantage.

  The term “comprising / comprising” as used herein is to be interpreted as specifying the presence of an explicit feature, integer, step or component, but one or more other features thereof. It should be emphasized that this does not exclude the presence or addition of integers, steps, components or groups.

100 scanner
101 light source
102 Original
103 Glass plate, platen
104 Reflected light
105 Image sensor
106 Optical sensor
107 Optical elements
108 Machine parts
109 Reflected light
110 fixed points
111 Redundant light sensor
112 Second sensor

Claims (15)

A method of adjusting a scanner comprising an image sensor having a linear array of photosensors for scanning a line, and a light source for emitting light,
Scanning a document, wherein the document is moved by a first movable mechanical member by moving an image sensor line by line relative to the document in a direction orthogonal to the one line until the entire document is scanned. Scanning step,
Additionally, by a second movable mechanical member configured to move the image sensor along the one line,
a) In order to dispose the image sensor from the actual scanning position to a predetermined scanning position, the image sensor is moved to have a resolution of one pixel or less so that the resolution of the digital image of the document can be improved. And steps to
b) By detecting the radiation of light from at least one fixed point, a difference between the actual scanning position and the predetermined scanning position is obtained, and the movement amount of the image sensor is corrected based on the difference. Steps,
c) scanning one line of the document at the predetermined scanning position and storing the one-line digital image of the document;
Including
A method comprising repeating steps a) to b) until the difference between the actual scanning position and the predetermined scanning position is less than a predetermined value.   Scanning to convert a document into a digital image by detecting light incident on the image sensor, wherein the light is emitted from a light source and reflected from the document, and the image sensor includes a plurality of light sensors. The method of claim 1, comprising the step of:   3. The method according to claim 1, wherein the steps a), b) and c) are performed for each line while scanning the original line by line.   The method according to claim 1, wherein a moving range of the image sensor in a direction along the linear array is smaller than 2 μm.   As long as the distance between the actual scanning position of the image sensor and the first predetermined scanning position is greater than a predetermined value, the scanning of the document is not started, and adjusting the image sensor is not an image at all. Without scanning, and as soon as the distance between the actual scanning position of the image sensor and the first predetermined scanning position becomes smaller than a predetermined value, the actual scanning of the original is started. The method according to claim 1, wherein the method is characterized in that   Detection of radiation from the at least one fixed point is performed by receiving the radiation with at least one redundant light sensor, wherein the redundant light sensor is not used for generating a digital image of the document. 6. A method according to any one of claims 1 to 5, characterized in that it is defined. The at least one redundant light sensor comprises:
-The image sensor;
-A second sensor;
The method of claim 6, wherein the method is disposed on a device selected from the group comprising:   8. The method according to claim 1, wherein the step of determining the difference between the actual scanning position and the predetermined scanning position is performed by optical feedback.   The method according to claim 1, wherein when the difference is equal to or greater than a predetermined threshold, a sequential substitution method is performed.   The method of claim 9, wherein the successive substitution method includes a compensation calculation. Performing a compensation calculation based on the determined difference between the first actual scanning position and the first predetermined scanning position to determine a second predetermined scanning position;
Adjusting the movement of the image sensor to position the image sensor at the second predetermined scanning position;
The method according to claim 1, further comprising: -A light source for emitting light;
-A linear array of image sensors for scanning one line;
A first movable mechanical member for moving the image sensor or the document relative to each other in a direction orthogonal to the linear array until the entire document is scanned line by line;
A second movable mechanical member configured to move the image sensor from an actual scanning position to a predetermined scanning position in a direction along the linear array;
-Means for determining a difference between the actual scanning position and the predetermined scanning position;
-Means for detecting radiation from at least one fixed point having a fixed position relative to the image sensor to determine the difference between the scanning position and the predetermined scanning position;
A scanner for scanning a document, comprising: The second movable mechanical means comprises:
-Voltage means;
-An actuator;
-A piezoelectric motor;
-A resonant circuit;
-A vibration motor;
-Magnetic means;
-A solenoid;
The scanner of claim 12, wherein the scanner is moved using means selected from the group comprising: The scanner
-A large scanner;
-A roller scanner;
-A flatbed scanner;
14. A scanner according to claim 12 or 13, wherein the scanner is selected from the group comprising:   15. A servo mechanism, servo drive or servo motor that provides error detection feedback to correct the performance of the first movable mechanical member. Scanner.

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