JPH08149260A - Image reader - Google Patents

Abstract

PURPOSE: To generate the image representing accurately the image of an original even when a handy scanner is moved on a curve locus. CONSTITUTION: An area CCD sensor 105 picks up a 2-dimension image of an original with rough resolution attended with the movement of a handy scanner so as to be partly in duplicate every time and an area CCD sensor 112 picks up a 2-dimension image of the original with high resolution. A relative relation between images picked up by the area CCD sensor 105 is obtained based on an image pattern in the duplicate range, the relative arrangement between images picked up by the area CCD sensor 112 and the images picked up by the CCD sensor 112 are combined so as to be in matching with the obtained arrangement.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image reading apparatus for reading an image, and more particularly to an image reading apparatus using a hand scanner for reading an image of an original while moving on the original for reading the image.

[0002]

2. Description of the Related Art Conventionally, there are roughly two types of scanners for sending an image of an optically read original to a connected personal computer (personal computer) or a word processor. Flatbed scanners and handy scanners) are known.

The flatbed scanner is a scanner of a type in which an original is placed on a reading surface prepared for the scanner and is read, and the scanner is necessarily larger than the original. Therefore, in order to handle a large document, it is necessary to enlarge the scanner body. Therefore, a large area is occupied around the personal computer or the like.

This is against the demand for space saving, and is a drawback of the flatbed scanner.

The other handy scanner is a type of scanner used by a user while moving on a document. The handy scanner sequentially reads the image of the document as it moves. Therefore, the handy scanner can be made smaller than the size of the document without depending on the size of the document to be read by the size of the scanner.

However, since the handy scanner reads an image while moving on a document, it is necessary to accurately detect the position where the image is read in accordance with the movement of the scanner. That is, the handy scanner is usually provided with a rod-shaped roller that moves while rotating on the original, and the moving distance of the scanner is measured according to the rotation of this roller, and the distance for one line of the generated image is measured. Each time the scanner moves, a line sensor such as a one-dimensional CCD sensor captures an image of the original for one line, and the images of each captured line are arranged in the capture order to generate the screen of the entire original. . Alternatively, at regular intervals, a line sensor such as a one-dimensional CCD sensor captures an image of an original for one line, and the position on the screen corresponds to the position of the scanner specified by the moving distance of the scanner at that time. By embedding the captured image of each line, the screen of the entire document is generated.

In the position detection using the rod-shaped roller, only movement information in the one-dimensional direction can be obtained. Therefore, when the speeds at both ends of the one-dimensional reading sensor are not constant (when there is movement including the rotation component of the scanner), the image for one line to be read is the line of the image read before that. However, the image of the entire original cannot be accurately generated.

Regarding this problem, taking as an example the case where an image for one line is taken in every movement of a fixed amount of movement,
This will be described in more detail.

FIG. 5 shows the structure of a conventional handy scanner.

In FIG. 5, 1000 is a handy scanner, 2
000 is a personal computer to which a handy scanner 1000 is connected.

When the user manually runs the handy scanner 1000 on an original while pressing a reading start button (not shown), the handy scanner 100 is operated.
The illumination light source 1101 emits light from the originals arranged in a line of 0 to illuminate the surface of the original in a straight line.

The light emitted from the illumination light source is reflected on the surface of the original, and the reflected light is collected by the optical system 1102 and imaged on the one-dimensional sensor 1103. The one-dimensional sensor 1103 converts the reflected light that has been imaged into an electric signal, and outputs it as image data for one line in the control circuit 110.
4 is output. Here, the conversion of the reflected light into the electric signal by the one-dimensional sensor 1104, that is, the reading of the image data for one line is measured by one encoder which detects the rotation of the roller 1106 provided in the scanner 1000. It is assumed that the movement amount is performed every time the movement amount reaches a certain amount (a distance corresponding to the width of one line of the image).

The control circuit 1104 transmits the received image data for one line to the personal computer 2000 via the interface circuit 1105.

In the personal computer 2000, an interface circuit 2001 is used to provide a handy scanner 1000.
The image data for one line transmitted by the above is received and stored in the memory 2002.

By repeating the above operation until the reading start button is released, image data for one line is sequentially stored in the memory 2002 of the personal computer 2000 to form one screen. . That is,
Personal computer 2000 received i-th 1
The image data for a line constitutes an i-line on the screen.

Now, in this case, the scanner 100
When 0 moves so as to draw a curve, the image data for one line is sequentially read with a different inclination with respect to the original. In this case, the two tilted on the original
On the memory of the personal computer 2000 having lines, the screen is constructed as two parallel lines, and therefore, the screen of the accurate image of the original cannot be generated.

For this reason, in the technique disclosed in Japanese Patent Laid-Open No. 3-256448, two position sensors are provided at both ends of the reading portion of the scanner, and the respective position sensors are made to detect the amount of movement in the directions orthogonal to each other. 1000
When the curve moves in a curved line, an accurate screen is generated by correcting the mutual positional relationship between the read lines in accordance with the amount of movement detected by the two position sensors.

Further, by reading the position information engraved on the sheet installed on the upper or lower part of the original together with the reading of the image data, the position on the sheet of the scanner is detected, and accordingly, the position is detected. A technique is known in which an accurate screen is generated by correcting the positional relationship between the read lines.

[0019]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
According to the technology described in Japanese Patent No. 56448, in reality, 2
The movement amount cannot be accurately detected by one position sensor, and an error occurs. Therefore, in the generated screen, characters, straight lines, etc. are not smoothly connected, and a shift or the like is unavoidable.

On the other hand, according to the method using the sheet in which the position information is engraved, the space saving cannot be realized because a sheet or the like on which the position information of the size of the original is recorded is required, and the handy scanner cannot be realized. The result is that the greatest advantage is destroyed.
Moreover, since it is necessary to install the seats one by one, the annoyance at the time of use increases.

Further, according to the conventional image reading apparatus,
When reading an image of one original, all of the images are read at the same resolution.

Therefore, all the originals including a fine portion of the image are read with a fine resolution or a coarse resolution. Then, if all are read with fine resolution, unnecessary portions are read finely, so it takes time to read, the amount of image data becomes enormous, and the memory capacity is wasted. On the other hand, if all of them are read at a coarse resolution, even if a part of the image that is desired to be read finely (such as a photograph) is included, even that part is read roughly, which causes a problem that the image quality is deteriorated.

In view of the above-mentioned problems of the conventional image reading apparatus, the present invention does not require a special sheet or the like, and more accurately, even when a document is moved in a curved line. It is an object of the present invention to provide an image reading device capable of generating an image.

It is another object of the present invention to provide an image reading apparatus capable of reading an image of a modified original document presented for each part when a rough part and a fine part are included in the same document.

[0025]

[Means for Solving the Problems] To achieve the above object,
The present invention is, for example, a first imaging unit that is two-dimensionally moved on a document and sequentially captures a two-dimensional image of a predetermined range of the document at a predetermined resolution with the movement. The two-dimensional image, which is fixed to the image pickup means and is for each part of the document, has a resolution higher than the resolution of the first image pickup means within a range narrower than the image pickup area of the first image pickup means, and is accompanied by the movement. There is provided a handy scanner device having a second image pickup means for sequentially picking up images.

[0026]

The handy scanner device according to the present invention comprises two mutually fixed image pickup means, and the second image pickup means is arranged in a range narrower than the range imaged by the first image pickup means. A two-dimensional image of a document is sequentially captured with the movement at a resolution higher than that of the first imaging unit.

If such a handy scanner device is used, the image picked up by the first image pickup means is always an image picked up in an area wider than the image picked up by the second image pickup means. By referring to this, it is possible to accurately obtain the mutual positional relationship between the images captured by the second imaging unit, including the rotation component. Then, the respective images captured by the second image capturing means can be combined so as to match the obtained arrangement relationship.

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the image reading apparatus according to the present invention will be described below.

The structure of the image reading apparatus according to this embodiment is shown in FIG.

In the figure, 100 is a handy scanner, and 200
Is a personal computer.

The handy scanner 100 includes a control circuit 10
2. Area CCD sensor 105 (coarse area CCD sensor 115) that captures a two-dimensional image at a coarse resolution, area CCD sensor 11 that captures a two-dimensional image at a fine resolution
2 (fine area CCD sensor 112), a light source 104 composed of a light emitting diode array for illuminating a document, a coarse area CCD sensor 105, an optical system 106 for focusing the reflected light of the document on the fine area CCD sensor 112, an image combining means 103, Interpolation means 108, memory 10
7, position conversion means 109, character straight line recognition means 110, and interface circuit 111.

As shown in FIG. 2a, a fine area CCD
The sensor 112 is stacked on the rough area CCD sensor 105 and images a range narrower than that of the rough area CCD sensor 105. The coarse area CCD sensor 105
The image of the square-shaped area surrounding the area captured by the fine area CCD sensor 112 is captured.

The handy scanner 100 also has two ball-shaped spheres 101 at target positions with respect to the center of the area CCD sensor 105. Ball-shaped sphere 10
Although not shown in FIG. 1 in order to avoid complication of the drawing, two rollers that rotate in two predetermined directions orthogonal to each other are provided so as to rotate with the rotation of the sphere. Moreover, an encoder for detecting the rotation of the roller is connected to each roller.

The ball-shaped sphere is the handy scanner 100.
Rotates with the movement of. This rotation is decomposed into mutually orthogonal components by a roller provided adjacent to the rotation, and the amount of movement of each component is detected by the encoder. The detected movement amount is transmitted to the control circuit 102 in the form of pulse information (the movement amount is represented by the number of pulses).

On the other hand, the personal computer 200 is
The interface circuit 201 and the memory 202 are provided.

The operation of the image reading apparatus according to this embodiment will be described below.

When the start of image reading is instructed, the control circuit 102 of the handy scanner 100 causes the rough area C
CD sensor 105 and fine area CCD sensor 11
2 picks up an image of the original, and the image picked up by the coarse area CCD sensor 105 is used as a reference partial image, and the fine area CC
The image captured by the D sensor 112 is used as a partial image in the memory 1
It is stored in 07. Then, after that, the control circuit 102 of the handy scanner 100 obtains a finer movement amount of the center of the area CCD sensor 112 and a rotation amount with this center as a rotation center than the movement amount transmitted from the encoder, and the fine movement amount is obtained. Each time the movement amount of the center of the area CCD sensor 112 becomes the length of one side of the area CCD sensor 112,
Coarse area CCD sensor 105 and fine area CC
The D sensor 112 captures an image of the document, and the image is stored in the memory 1
It is stored in 07.

The image combining means 103 and the memory 107
Every time an image is captured in the memory 107, the entire area created by combining the images captured by the fine area CCD sensor 112 up to the previous time in the memory 107 is added to the fine area CC this time.
The images captured by the D sensor 112 are combined.

The details of creating the whole image will be described below.

First, the partial image stored in the memory 107 for the first time is set as the whole image. Then, when the second reference partial image (reference numeral 301 in FIG. 3a) is stored in the memory 107, the character / line recognition unit 110 causes the control circuit 10 to operate.
2 receives the amount of movement of the handy scanner 100, obtains the overlapping range of the second reference partial image and the first reference partial image (reference numeral 300 in FIG. 3a), and includes this range (on the original The same object of () is photographed) characters (print characters) or straight lines are detected. As a method of detecting characters, Japanese Patent Laid-Open Nos. 2-170280, 3-179585 and 2-255996 are available.
Various methods such as the method described in Japanese Patent Application Laid-Open No. 2-126382 and the like are known. For example, a method for detecting characters by taking a histogram of an image vertically and horizontally and diagonally, and the like can be used. You can

In this detection, the position of the character in one image, the character corresponding to the straight line, and the straight line in the other image should be roughly estimated from the movement amount of the handy scanner 100. You can

Then, the character / straight line detecting means 110 detects the area of the detected character or straight line (reference numerals 302 and 30 in FIG. 3b).
3) is taken out from the respective images onto the memory 107.

When two character or straight line areas are taken out from the memory 107, the interpolation means 108 enlarges each area. Enlargement is performed by generating pixels between pixels in each area by interpolation. Thereby, it can be linearly doubled and the area can be quadrupled. Further, the number of pixels may be increased 16 times or more by further performing interpolation. By performing the interpolation in this way, it is possible to eliminate the influence of the shift (maximum half pixel) of the CCD cell of the area CCD sensor corresponding to one pixel with respect to the character or the straight line when the both areas are photographed.

When the two character or straight line areas are expanded on the memory 107, the character / line detection means 110
Detects the linear component in the character pattern included in both areas. (However, in advance, the character and straight line recognition means 1
If 10 detects a straight line instead of a character, this process is unnecessary. ) Then, for each image, the longest straight line component is extracted from each image, and the shift in the direction of the straight line component in both images (shift angle) is detected. For detection of straight lines and straight line components, for example,
The image is binarized, black pixels are extracted from the binarized image, black pixels connected to the black pixels are extracted, and black pixels are present on the line connecting both ends of the connection of the extracted black pixels. It can be performed by determining whether or not Further, the length of the straight line or the straight line component is obtained from the coordinates of both ends of the detected straight line or the straight line component. In addition, the slope of a straight line or a straight line component can be determined by the endpoint fitting method, the iterative endpoint fitting method (“Image recognition and image understanding”, Keigaku Publishing), the Hough transform method (Matsuyama, Kosui, “Hough transform and pattern matching”). , Information Processing Vol.30 No.9 (Heisei 1)).

Then, the image combining means sets the memory 10 so that the detected misalignment angle becomes zero.
The second reference image read from 7 is rotated to
The reference partial image for the second time is overlaid so that the longest straight line component extracted previously overlaps (FIG. 3c).

Then, at the boundary portion between the images of the first and second reference partial images, it is detected whether or not there is a deviation in which characters, straight lines, etc. are not smoothly continuous, as shown in FIG. 4a. If so, the second reference partial image is rotated at a small angle, a few times at different angles, so as to eliminate the deviation. If the displacement is not eliminated by this rotation, the entire character is horizontally moved pixel by pixel until the displacement is eliminated, and the displacement is eliminated as shown in FIG. 4b.

When the deviation is eliminated, the range on the original corresponding to the second partial image and the first partial illumination are determined from the amount of rotation and movement applied to the second partial image for reference. The relative layout relationship on the document with respect to the range on the document corresponding to the working image is obtained, and the second layout is performed so as to match the obtained layout relationship.
Rotate and move the partial image for the first time, join it to the first partial image in the entire image (in this case, the entire image and the first partial image are equal), and join the combined images for the third The whole image for the partial image of.

The above-described processing is repeated every time the partial image and the reference image are fetched in the memory 107 until an instruction to finish the image reading is given, so that the entire image of the entire original is created in the memory 107.

When the entire image of the entire original is created in the memory 107, the control circuit 102 sends it to the personal computer 200 via the interface circuit 111.

In the personal computer 200, the interface circuit 201 receives this and stores it in the memory 202.

The embodiment of the present invention has been described above.

According to the above-described embodiment, the rough area CCD sensor 105 sequentially photographs the originals so that the photographing ranges partially overlap each other, and the rough image is obtained based on the image patterns included in the overlapping ranges. The relative arrangement between the images photographed by the area CCD sensor 112 is obtained, and the relative arrangement between the images photographed by the fine area CCD sensor 112 is obtained from this, and the fine area CCD is adapted to this.
The images captured by the sensor 112 were sequentially combined. Therefore, according to this embodiment, even when the handy scanner 100 is moved by drawing a curve, it is possible to accurately generate an image of a document having a fine resolution captured by the fine area CCD sensor 112. You can

On the contrary, the case of generating an image of a fine resolution, which accurately represents an original and is photographed by the coarse area CCD sensor 105, will be described below.

In this case, when the image reading is instructed, the control circuit 102 of the handy scanner 100 causes the rough area CCD sensor 105 and the fine area CCD sensor 112 to pick up the image of the original, and the image picked up by the rough area CCD sensor 105. And a small area CCD sensor 1
The image picked up by 12 is a coarse area CCD sensor 105
An image obtained by combining the image converted into the image having the resolution of 1) according to the arrangement is stored in the memory 107 as the first partial image. A fine area CCD sensor 1
Coarse area CCD sensor 105 of the image captured by 12
As shown in FIG. 2B, the conversion into the image of the resolution can be performed by using the average value of a plurality of pixels of the image captured by the fine area CCD sensor 112 as the value of the pixel of the corresponding converted image. it can.

After that, the control circuit 102 of the handy scanner 100 determines from the movement amount transmitted from the encoder,
The movement amount of the center of the fine area CCD sensor 112 and the rotation amount with this center as the rotation center are obtained, and the rough area CC
The coarse area CCD sensor 10 is used so that the D sensor 105 captures an area that partially overlaps the previously captured area each time.
5 and the fine area CCD sensor 112 picks up an image of the original, and the combined image as described above is stored in the memory 107 as a partial image.

The image combination means 103 and the memory 107
Each time a partial image is captured, the partial image captured this time is combined with the entire image created on the memory 107 by combining the partial images captured up to the previous time.

The details of creating the whole image will be described below.

First, the partial image stored in the memory 107 for the first time is set as the whole image. Then, when the second partial image is stored in the memory 107, the character / line recognition unit 110 causes the control circuit 102 to cause the handy scanner 10 to operate.
A moving amount of 0 is received, a range in which the second partial image and the entire image overlap is obtained, and a character (print character) included in this range (the same object on the original is photographed) is included.
Alternatively, a straight line is detected. Then, the character / straight line detection means 1
Reference numeral 10 retrieves the detected character or straight line area from the respective images onto the memory 107.

When two character or straight line areas are extracted from the memory 107, the interpolation means 108 enlarges each area. Enlargement is performed by generating pixels between pixels in each area by interpolation. Thereby, it can be linearly doubled and the area can be quadrupled. Further, the number of pixels may be increased 16 times or more by further performing interpolation. By performing the interpolation in this way, it is possible to eliminate the influence of the shift (maximum half pixel) of the CCD cell of the area CCD sensor corresponding to one pixel with respect to the character or the straight line when the both areas are photographed.

When the two character or straight line areas are enlarged on the memory 107, the image combining means detects the straight line components in the character patterns included in both areas. (However, in advance, the character / line recognition means 110
However, if a straight line is detected instead of a character, this process is unnecessary. ) And for each image,
The longest straight line component is extracted from each image, and the shift in the direction of the straight line component (shift angle) in both images is detected. Then, the detected misalignment angle is 0
The second partial image read from the memory 107 is rotated so that the whole image is overlapped with the longest straight line component extracted previously.

Then, at the boundary between the whole image and the image for the second reference partial image, it is detected whether or not there is a smooth discontinuity of characters, straight lines, etc., and if there is, a deviation is detected. In order to solve the problem, try rotating the second partial image at a small angle, a few times at slightly different angles. If the deviation is not eliminated by this rotation, the second partial image is horizontally moved pixel by pixel until it is eliminated, and the deviation is eliminated.

If the deviation is eliminated, finally,
In this way, an image in which the partial images are connected to the entire image is created in the memory 107, and this is used as the entire image for the third partial image. At this time, a range in which the entire image and the second partial image overlap each other occurs. Therefore, in this range, either one of the partial image and the entire image is valid, and the other image is invalid. In this embodiment,
Only the range of the partial image that does not overlap with the entire image is connected to the entire image.

Through the above processing, the entire image of the entire original is created on the memory 107 with a coarse resolution.

When the entire image of the entire original is created on the memory 107, the control circuit 102 sends it to the personal computer 200 via the interface circuit 111.

In the personal computer 200, the interface circuit 201 receives this and stores it in the memory 202.

Below, an image of coarse resolution taken by the coarse area CCD sensor 105 and a fine area CCD
A case will be described in which an image of one original is generated by mixing images of fine resolution captured by the sensor 112.

In this case, first, as described above,
An entire image with a coarse resolution of the entire original is created in the memory 107.

Then, after that, the handy scanner 100
Is moved to a range such as a photograph included in the original document that is desired to be captured at a fine resolution, and an instruction to read at the fine resolution is issued.

When the reading at the fine resolution is instructed, until the reading at the fine resolution is instructed,
As described above, an entire image with a fine resolution is created.

Then, the whole image of the fine resolution created is incorporated into the whole image of the coarse resolution created previously.

This processing is performed as follows. That is, the image combination means 103 moves the amount of movement measured by the encoder as the amount of movement of the handy scanner 100 between the time when the whole image having the coarse resolution is created and the time when the reading at the fine resolution is instructed. Is received through the control circuit 102, and a character and a straight line (the same object is photographed, which are commonly included in both the range of the created fine-resolution whole image and the range of the coarse-resolution whole image created earlier that overlap Object) is detected, the relative arrangement of the two is calculated based on this, and preferably the deviation of the boundary between the two is adjusted, and the whole image of fine resolution is incorporated into the whole image of coarse resolution ( The whole image of the fine resolution is replaced with the image at the overlapping position in the whole image of the coarse resolution) and stored in the memory 107.

Since the resolution (number of pixels per unit area) differs between the created fine-resolution whole image and the coarse-resolution whole image, a plurality of pixels are converted into one pixel by averaging in advance. The entire image having a fine resolution may be reduced (converted to a coarse resolution) and the above-described processing for obtaining the relative arrangement may be performed.

With the above processing, the coarse area CCD sensor 1
The entire image of one document in which a coarse resolution image captured by the image sensor 05 and a fine resolution image captured by the fine area CCD sensor 112 are mixed is stored in the memory 10.
It has been created on 7. In this way, when the final entire image of the original document is created on the memory 107, the control circuit 102 sends it to the interface circuit 11.
1 to the personal computer 200.

In the personal computer 200, the interface circuit 201 receives this and stores it in the memory 202.

[0075]

[Effect] As described above, according to the present invention, it is possible to move in a curved line without requiring a special sheet or the like.
It is possible to provide an image reading device that can more accurately generate an image of a document. Further, when a rough portion and a fine portion are included in the same document, it is possible to provide an image reading device capable of reading the image of the document with a resolution suitable for each part.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an image reading apparatus according to an embodiment of the present invention.

FIG. 2 is a two-area CCD used in one embodiment of the present invention.
It is a figure showing the arrangement | positioning of a sensor, and the relationship of resolution.

FIG. 3 is a diagram showing an image superimposing process performed in an embodiment of the present invention.

FIG. 4 is a diagram showing a process of eliminating a deviation performed in an embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of a conventional image reading device.

[Explanation of symbols]

 100 Handy Scanner 101 Sphere 102 Control Circuit 103 Image Combination Means 104 Light Source 105 Coarse Resolution Area CCD Sensor 106 Optical System 107 Memory 108 Interpolation Means 109 Position Conversion Means 110 Character Line Recognition Means 111 Interface Circuit 112 Fine Resolution Area CCD Sensors 200 personal computer

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location G06K 9/22 H04N 1/387 101

Claims (5)

[Claims] 1. A first image pickup means for moving a two-dimensional image of a document two-dimensionally in a predetermined range at a predetermined resolution and sequentially capturing the two-dimensional image with the movement, and the first image pickup means. The two-dimensional image is fixed to the means, and the two-dimensional image of each part of the original is sequentially moved with the movement at a resolution higher than the resolution of the first imaging means in a range narrower than the range captured by the first imaging means. A handy scanner device having a second image pickup means for picking up an image. 2. A first image pickup means for sequentially picking up a two-dimensional image of a predetermined range of the document at a predetermined resolution as it is moved on the original document, and to the first image pickup means. A second fixed image capturing device that sequentially captures a two-dimensional image for each part of a document with a resolution higher than the resolution of the first image capturing unit in a range narrower than the image capturing range of the first image capturing unit. Of the first image pickup unit and the second image pickup unit, the first image pickup unit picks up a two-dimensional image partially overlapped with the two-dimensional image taken last time with the movement. To do
At the same time, a control means for picking up a two-dimensional image of the original, and an image pattern included in a range overlapping with the i-th taken two-dimensional image in the two-dimensional image taken by the first image pickup means i + 1 The arrangement in the (i + 1) th two-dimensional image of the target image pattern and the image pattern corresponding to the target image pattern in the i-th captured two-dimensional image are the reference image patterns. Range on the document corresponding to the (i + 1) th captured two-dimensional image and the range on the document corresponding to the (i) th captured two-dimensional image according to the arrangement in the i-th captured two-dimensional image. Of the second image pickup means depending on the obtained relative arrangement.
The relative arrangement on the original between the area on the original corresponding to the + 1st captured two-dimensional image and the area on the original corresponding to the i-th captured two-dimensional image is calculated, and the calculated relative arrangement is calculated. And the arrangement of the i-th captured two-dimensional image on the document, the second imaging unit obtains the arrangement of the (i + 1) -th captured two-dimensional image, and the second imaging is performed so as to match the arrangement. I is a two-dimensional image obtained by combining the two-dimensional images captured by the means i + 1 with the two-dimensional images captured by the first imaging means from the first to the i-th.
An image reading apparatus comprising: a means for combining with the (i) th combined image to generate an (i + 1) th combined image. 3. The image reading apparatus according to claim 2, wherein the second image pickup means is stacked on the first image pickup means on the side of the document as viewed from the first image pickup means. An image reading device characterized by the above. 4. A first image pickup means that sequentially moves a two-dimensional image of a predetermined area of the original document at a predetermined resolution as the movement is performed on the original document; and with respect to the first image pickup means. A second fixed image capturing device that sequentially captures a two-dimensional image for each part of a document with a resolution higher than the resolution of the first image capturing unit in a range narrower than the image capturing range of the first image capturing unit. And the two-dimensional image captured by the second image capturing unit,
2 having a resolution that matches the predetermined resolution of the imaging means of
And a second image capturing means for converting the three-dimensional image into a three-dimensional image, and an image combining means for generating an image in which two-dimensional images of the document portion sequentially captured by the first image capturing means are combined. The image combining unit is stacked on the first image pickup unit on the document side as viewed from the first image pickup unit, and the image combination unit converts a two-dimensional image obtained by converting the two-dimensional image picked up by the second image pickup unit, An image reading apparatus, which is used as a substitute for a two-dimensional image in a range of a shadow of a stacked second image pickup unit that cannot be picked up by the first image pickup unit. 5. A first imaging means for moving a two-dimensional image of a predetermined range of the original at a predetermined resolution as the movement is performed, the first imaging means, and the first imaging means. A second fixed image capturing device that sequentially captures a two-dimensional image for each part of a document with a resolution higher than the resolution of the first image capturing unit in a range narrower than the image capturing range of the first image capturing unit. The image pickup means, the two-dimensional image of the portion of the document sequentially captured by the first image pickup means, and the two-dimensional image of the portion of the document sequentially captured by the second image pickup means are combined for each portion of the document. And an image combination means for generating an image.