JPH0846761A - Image input method and its device - Google Patents

Abstract

PURPOSE:To easily acquire image data having lateral straight line with less sampling distortion. CONSTITUTION:An image input section 1 is provided with an original platen turnable around an axis perpendicularly to an image input face and with a drive motor driving the original platen. Image data outputted from the image input section 1 are stored in a primary image storage section 11 as primary image data. A straight line detection means 12 detects sequentially coordinates of straight lines from the stored primary image data. A straight line table generating means 13 obtains a region in which a tilt angle of detected straight line components is included out of plural predetermined angle regions and stores accumulation of the frequency numbers to a straight line table generating means 13 as a straight line table. A tilt angle decision means 14 decides the tilt angle of straight lines based on the content of the straight line table and an angle correction means 14 provides an output of an angle correction drive signal so as to make the decided tilt angle zero to turn the original platen 7. Then image data are acquired from the image input section 1 and stored in a secondary image storage section 16 as secondary image data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image input method and an apparatus thereof, and more particularly to an image input method and an apparatus for inputting an image of a document including ruled lines as digitized image data.

[0002]

2. Description of the Related Art An image of a manuscript in which numbers, characters, etc. are written in predetermined positions divided by ruled lines such as vertical lines and horizontal lines,
For example, regarding a slip, as an apparatus for inputting this slip as image data, the paper surface of the slip to be input is two-dimensionally (X and Y directions) by using an optical system acquisition unit.
Are scanned and input as image data.

That is, for example, a light source that moves in the X and Y directions and a photosensor that moves integrally with the light source are provided as the acquisition unit, and the paper surface to be input is irradiated with light from the light source, and the reflected light of this light is reflected. Is detected by the photo sensor,
For example, when a black character written on a white paper surface is input as image data in pixel units, the white paper surface is set to level 1 and the black character portion is set to level 0 2
Image data is output as a digital value.

However, when a document whose image is to be acquired is placed on a predetermined acquisition surface of the image input unit having such an optical acquisition unit, the operation direction of the acquisition unit is X.
If the direction and the horizontal ruled lines on the slip are not parallel,
The acquired image data will be acquired as image data that is inclined with respect to the horizontal or vertical direction as a whole.

In order to correct image data acquired in such a manner that it is not parallel to the scanning direction of the image input section but is tilted, a conventional apparatus of this type uses the image data once acquired in the horizontal direction. A straight line (ruled line or the like) component is detected, an inclination angle with respect to the X direction, which is the horizontal scanning direction, is detected, and the acquired image data is entirely rotated and corrected so that the detected inclination angle is zero. .

FIG. 6 is a block diagram of a document image processing system described in Japanese Patent Publication No. 62-133584, which is an example of a conventional image input device of this type.

In response to a command from the data processing device 34 in the figure, the image input unit 31 operates to obtain digitized image data from the target paper surface on which the document placed at a predetermined position is described. Then, it is stored in the image memory 32.

The data processing device 34 sequentially processes the image data stored in the image memory 32, determines a straight line component (a region where black pixels are connected) on the image, and coordinates indicating a representative point of the determined region. A list of is created in the table memory 36.

Subsequently, the data processing device 34 sequentially reads the coordinates of each of the above-mentioned representative points from the table memory 36,
The frequency of the above-mentioned representative points passing on each line is obtained for a set of a plurality of parallel lines set by changing the inclination angle, and the result is stored in the table memory 37 as a list.

Based on this list, a set of parallel lines having the highest frequency is found, a common tilt angle of each straight line is found, and the tilt angle is stored in the image memory 32 so as to be zero. The rotated image data is rotated, and the processed image data is stored in the image memory 33.

The image data stored in the image memory 33 in this way is stored as modified image data in, for example, the file device 38, and is used later instead of the image data stored in the image memory 32. .

[0012]

The above-mentioned conventional image input device extracts a straight line component from the image data once input by the image input unit 31, and detects a straight line having the maximum number of parallel straight lines. The tilt angle with respect to the scanning direction X is obtained, and the rotation processing is performed on the once input image data so that the tilt angle becomes zero. Therefore, the rotation amount is increased as the data amount of the acquired image data increases. It has the drawback of increasing the time required.

Further, when the image input section inputs the digitized image data, sampling distortion occurs.

As described above, the sampling distortion generated when the image data is once input remains in the image data after the rotation processing even if the entire image data is rotated as described above.

In such a case, in particular, the image to be acquired has many horizontal ruled lines, and the image acquired in the state where the horizontal ruled lines are not parallel to the horizontal (X direction) scanning direction of the image data. In the data, the ruled line in the horizontal direction does not become a smooth straight line, and there is a drawback that the image data becomes unsightly.

According to the present invention, the horizontal ruled lines of the target image with respect to the scanning direction (X direction) of the image acquisition unit can be acquired as image data in which smooth straight lines are obtained, and the target image can be acquired. It is an object of the present invention to provide an image data input method and an image data input method capable of acquiring image data in a relatively short time regardless of the amount of data.

[0017]

According to the image input method of the present invention, an image written on a document by an image input section is X-rayed.
In the image input method of scanning in the direction (horizontal scanning direction) and Y direction (longitudinal scanning direction), converting to digitized image data, inputting the image data, and storing the image data in the image storage unit, the image sensor faces the photosensor. In addition, a transparent plate-shaped manuscript table rotatable about an axis perpendicular to the image surface of the manuscript and a drive motor for rotating the manuscript table are provided in a state where the manuscript is placed on the image input section. A primary image storage unit and a secondary image storage unit are provided as the image storage unit, and the image of the document placed on the document table is converted into image data by the image input unit to convert the image to the primary image storage unit. Stored as the primary image data, the consecutive black points are identified as a straight line from the primary image data, the coordinates of the start point and the end point of the straight line are output, and the image input is performed based on the identified coordinates of the straight line. The inclination angle of the straight line with respect to the horizontal scanning direction is calculated, the corresponding angle area of the calculated inclination angle is identified with respect to a plurality of angle areas of a predetermined inclination angle, and the appearance frequency of the identified angle area Is stored as an angle table, the angle table is referred to, a representative angle determined in advance for an angle region having the maximum appearance frequency is determined as a tilt angle, and the tilt angle is set to zero. A process of generating a signal, rotating the document table in addition to the drive motor, and thereafter again inputting image data of the document by the image input unit and storing the image data as secondary image data in the secondary image storage unit. It is configured.

In the image input apparatus of the second invention, the image written on the original by the image input unit is scanned in the X direction (horizontal scanning direction) and Y direction (vertical scanning direction) and digitized. In an image input device for converting into image data and inputting and storing it in an image storage unit, the image input unit is allowed to face a photosensor of the image input unit and is rotatable about an axis perpendicular to the image surface of the document. Image data output as primary image data by the image input unit, which is provided with a transparent plate-shaped document table arranged on the substrate and a drive motor for rotating the document table according to an angle correction drive signal applied from the outside. A primary image storage section for storing the linear image data, linear line detection means for detecting a linear component from the primary image data and outputting coordinates of a start point and an end point thereof, and the horizontal scanning direction based on the coordinates of the start point and the end point. The inclination angle of a straight line having the start point and the end point with respect to the inclination angle is obtained to identify which of the plurality of inclination angle areas the inclination angle corresponds to beforehand, and the appearance frequency of the area of the corresponding inclination angle is detected. The straight line table generating means for generating and storing a straight line table accumulated for each straight line, and the tilt angle region having the maximum appearance frequency based on the straight line table are identified and given in advance to this tilt angle region. The tilt angle determining means for determining a representative angle as a tilt angle, the angle correcting means for generating and outputting the angle correction drive signal for setting the determined tilt angle to zero, and the document table rotating by the angle correcting means. After being processed, the secondary image storage unit that stores the secondary image data output by the image input unit, and the image in response to an externally added image data acquisition command. The primary image data is output from the input unit, the output image data is stored as the primary image in the primary image storage unit, the secondary image data is output by the image input unit, and the secondary image data is output. And a central processing unit for controlling the straight line detecting means as well as for controlling the storage in the image storage unit.

Further, the image input device of the third invention is provided with a corrected image storage unit for storing the corrected image data, and has a linear component from the secondary image data stored in the secondary image storage unit of the image input device described above. Image data is extracted, and the image data of the extracted linear component is output, and the remaining image data in which the image data of the linear component is extracted is output separately, and the horizontal scanning direction of each straight line is extracted from the image data of the linear component. Is calculated to identify whether or not the calculated tilt angle is within a predetermined vertical line tilt angle region, and for the straight line component existing in the vertical line tilt angle region, Correction is made to a straight line component in which the value of the X coordinate of the other end is matched with the X coordinate of one of the predetermined X coordinates of the end point and the start point,
The corrected straight line image data is output as the corrected straight line image data, and the image data of the straight line component outside the tilt angle region of the vertical line is directly output as the corrected straight line image data, and the corrected straight line image data and the image data from which the straight line is removed are combined. Then, a process of storing the corrected image data in the corrected image storage unit is provided.

Further, the image input device of the fourth invention has the following components added to the image input device of the second invention already described. That is, the added component extracts all straight line components from the secondary image data stored in the secondary image storage unit as straight line image components and outputs them as straight line image data, and at the same time, extracts the straight line from the secondary image data. Straight line extraction means for outputting image data excluding image data as retouching image data, and a straight line component having a tilt angle within a predetermined tilt angle range with respect to the horizontal scanning direction based on the straight line image data. Is identified as a vertical line, and one of the X coordinates of the start point and the end point of the identified vertical line is matched with the X coordinate of the other of the predetermined X coordinates of the start point and the end point. Vertical line correction means for correcting the corrected straight line image data and outputting the image data of the straight line not identified as the vertical line as the corrected straight line image data. The image forming apparatus includes a retouched image synthesizing unit that synthesizes the retouching image data output from the correction unit and the retouching image data output from the straight line extracting unit and outputs the retouched image data, and a retouched image storage unit that stores the retouched image data. .

[0021]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of an image input device to which the image input method of the present invention is applied.
3 is a perspective view showing an example of the configuration of the image input unit 1 shown in FIG. 1, and FIG. 3 is a flow chart showing the operation of the image input method of the present invention.

FIG. 4 is a block diagram showing an embodiment of the image input device different from that of FIG. 1, and FIG. 5 is a flow chart for explaining the operation of the image input device of FIG.

The image input device shown in FIG. 1 stores a keyboard 8 for inputting an image data acquisition command and other commands and data from the outside, and a program created in advance for image processing. Program storage unit 1
0, a central processing unit 9 that performs image processing according to a program stored in the program storage unit 10 in accordance with a command from the keyboard 8, and a command added via the central processing unit 9 An image input unit 1 for acquiring and outputting digitized image data is provided.

This image input device also includes a primary image storage section 11 for storing image data as primary image data,
A straight line detecting means 12 that detects a straight line component from the primary image data and outputs coordinates of the start point and the end point of the detected straight line component, and a table for the straight line is generated and stored based on the coordinates of the start point and the end point of the straight line described above. A straight line table generating means 13 and a tilt angle determining means 14 for determining a tilt angle of a straight line having the maximum tilt frequency based on the straight line table are provided.

The image input device shown in FIG. 1 further comprises an angle correction means 15 for outputting an angle correction drive signal for making the tilt angle determined by the tilt angle determination means 14 zero, to the image input section 1 described above. There is.

Further, the image input device further includes a secondary image storage unit 16 for storing the image data output by the image input unit 1 as secondary image data after the angle of the image is corrected by the angle correction drive signal. I have it.

As shown in FIG. 2, the image input unit 1 is in the form of a flat plate that is mostly transparent, including the central portion, and has a document on which an image to be input as image data is written on the upper surface. A document table 7 for placing the document table, a drive motor 6 for rotating the document table 1 around a rotation center P having an axis perpendicular to the wide surface, and a wide surface of the document table 1 opposite to the above-mentioned document. The carriage 2 is provided on the side and moves in the scanning direction of the X direction (horizontal direction) and the Y direction (longitudinal direction) in parallel with the wide surface of the document table 1.

The carriage 2 has a light source 3 which emits light toward the surface of the document, and a photo sensor which detects reflected light emitted from the light source 3 and reflected by the document surface and outputs it as digitized image data. 4 and are attached.

When the carriage 2 moves for scanning in the Y direction, it moves along the guide 5.

The light source 3 and the photo sensor 4 are integrated with each other, and move in the X direction along a guide (not shown) to perform scanning in the lateral direction.

The operation of the image input device shown in FIG. 1 will be described below with reference to the flowchart of FIG.

In the following description, the processing step is abbreviated as S.

When a manuscript is placed with the manuscript surface facing downward so that the manuscript surface to be input is in contact with the upper surface of the manuscript table 7 of the image input section 1 and a command for inputting a predetermined image is input from the keyboard 8. The central processing unit 9 receives this command and operates the image input unit 1 (S1).

When the image input section 1 operates to scan the image of the original and outputs the image data, the central processing section 9 follows this program stored in the program storage section 10 as primary image data. The image is stored in the primary image storage unit 11 (S2).

When the acquisition of the above-mentioned primary image data is completed, the central processing unit 9 activates the straight line detecting means 12.

The straight line detecting means 12 reads the primary image data stored in the primary image storing means, identifies continuous black points as straight line components, and coordinates of all the identified straight line components (X coordinate). And the Y coordinate) and the coordinates of the end point are sequentially output to the straight line table generating means 13 (S
3).

The straight line table generating means 13 calculates the tilt angle of each straight line with respect to the horizontal scanning direction (X direction) of the image input unit 1, divides the tilt angle into predetermined angle ranges, and The appearance frequency of the straight line in the range of the tilt angle is accumulated and a straight line table corresponding to each angle range of the tilt angle is generated and stored (S4).

When the generation of the straight line table is completed, the central processing unit 9 starts the tilt angle determining means 14. The tilt angle determination means 14 refers to the straight line table stored inside the straight line table generation means 13 to identify the range of the tilt angle with the highest frequency of appearance, and is determined in advance for each of the above angle ranges. The representative angle that exists is determined as the tilt angle (S5). As the representative angle, for example, the median value of the corresponding angle range may be set.

Here, the angle range referred to by the angle-of-inclination determining means 14 is determined, for example, so that only the angle range in which the angle of inclination is 45 degrees or less is referred to within the angle range of the straight line table. The operation of the means 14 may be preset.

When the tilt angle is determined, the tilt angle determination means 14 outputs the tilt angle to the angle correction means 15.

Upon receipt of the tilt angle, the angle correction means 15 outputs an angle correction drive signal whose absolute value is equal to the tilt angle and opposite in direction to the image input section 1 to drive and rotate the drive motor 6 of the image input section 1. Then, the document table 7 is rotated together with the document (S6).

When the rotation of the platen is completed, the image input unit 1 outputs a rotation end signal to the central processing unit 9.

Upon receiving this rotation end signal (S7), the central processing unit 9 restarts the image input unit 1 and outputs the image input unit 1 as secondary image data as the secondary image storage unit 16.
(S8).

Therefore, the direction of the horizontal line (horizontal ruled line) of the secondary image data stored in the secondary image storage unit 16 and the horizontal scanning direction (X direction) of the image input unit 1 are acquired as parallel image data. Will be.

Such secondary image data can be read out from the secondary image storage section 16 and used as needed.

The image input device shown in FIG. 4 has the following components added to the image input device shown in FIG.
A program storage unit 10A is provided instead of the program storage unit 10 shown in FIG.

That is, the secondary image data in the secondary image storage unit 16 is read, the image data of the linear component is extracted as the linear image data, and the linear image data and the image data of the remaining portion are separated and output. The extracting unit 18, the vertical line component in the vertical direction in the straight line image data, and when the direction is not orthogonal to the X direction, the vertical line correcting unit 19 that corrects the vertical line component and the corrected vertical line. Corrected image synthesizing means 20 for synthesizing the image data of the remaining straight line components and the image data excluding the straight line components output by the straight line extracting means 18, and a corrected image for storing the corrected image data output by the corrected image synthesizing means 20. And a storage unit 17.

The program storage unit 10A stores in advance a program for controlling the components shown in FIG. 4 other than itself, the angle correction means 15 and the keyboard 8.

The operation of the image input device shown in FIG. 4 will be described below with reference to the flow chart shown in FIG.

The steps 1 (S1) to 8 (S8) shown in the figure are the same as the steps 1 to 8 described in FIG.

When the secondary image data is stored in the secondary image storage unit 16, the central processing unit 9 activates the straight line extracting means 18, and the straight line extracting means 18 sequentially extracts the straight line components in the secondary image data. Vertical line correction means 19 as straight line image data
And the remaining image data obtained by removing the linear image data from the above-mentioned secondary image data is output to the retouched image synthesizing means 20 as the correction image data (S3).
1).

That is, the image data from which the linear component is excluded from the secondary image data is output to the modified image synthesizing means 20.

The vertical line correction means 19 identifies continuous black points in the above-mentioned straight line image data as straight lines, calculates the coordinates (X and Y coordinates) of the start point and the end point for each straight line, and determines these coordinates. Based on this, the tilt angle of each straight line with respect to the horizontal scanning direction (X direction) is calculated, and it is checked whether or not the calculated tilt angle exists within the predetermined angle range of the tilt angle of the vertical line. If so, the straight line component is regarded as a vertical line, and the following vertical line correction processing is performed and output as corrected straight line image data, and the straight line component that has not been identified as the remaining vertical line is subjected to vertical line correction processing. The corrected straight line image data is output to the corrected image synthesizing means 20 together with the components.

That is, for a straight line identified as a vertical line, the vertical line correction means 19 changes only the value of the X coordinate of the end point to a value that matches the X coordinate of the start point, and the end point after the change. A straight line connecting the coordinates and the coordinates of the starting point is generated as a corrected vertical line component, and is output to the corrected image combining means 20 as corrected straight line image data. Such processing is performed for all straight line components existing in the secondary image data (S
32).

In the modification of the vertical line described above, the X coordinate of the end point of the vertical line to be modified is made to coincide with the X coordinate of the start point, but conversely, the X coordinate of the start point of the target vertical line is the end point. Obviously, the X coordinate may be matched.

As the angle range of the above-mentioned vertical line inclination angle,
For example, if a region from 90 degrees −10 degrees to 90 degrees +10 degrees is given and the tilt angle is 80 degrees or more and 100 degrees or less, it is determined that the vertical line is a line to be corrected, and the above extraction process is performed. Good.

The corrected image synthesizing means 20 is the straight line extracting means 1
The corrected image data from which the straight line component output by 8 is removed and the corrected straight line image data output by the vertical line correction means 19 are combined to obtain corrected image data (S33).
It is output to 7 and stored (S34).

As described above, in the image input apparatus shown in FIG. 4, the document is imaged so that the horizontal lines (ruled lines) in the document are parallel to the horizontal scanning direction (X direction) of the image input unit 1. The secondary image data is acquired by rotating on the original table 7 of the input unit, the vertical line in the secondary image data is identified, and the identified vertical line is parallel to the Y direction (orthogonal to the X direction). If not, the direction of the corresponding straight line component can be corrected so that the direction is parallel to the Y direction.

Such corrected image data is stored in the corrected image storage unit 17, and when the image data is used, it can be read from the corrected image storage unit 17 and used.

[0061]

As described above, in the image input method of the present invention, the primary image is acquired from the image input unit, and the frequency of appearance is the highest among the straight lines (ruled lines, etc.) in the horizontal direction from the primary image. For a straight line component having a high tilt angle of, the tilt angle with the horizontal scanning direction is detected, and this tilt angle is set to zero,
By rotating the document table 7 of the image input section 1 and thereafter inputting an image from the document as secondary image data,
This has an effect that the sampling distortion of the horizontal line can be made small and image data having a good appearance can be input.

In this case, there is also an effect that it is not necessary to increase the time required to acquire the image data even when the original includes a large amount of images.

According to the image input method to which the image input method described with reference to FIG. 5 is applied, vertical lines which are not orthogonal to the horizontal scanning direction are further added to the image data obtained as described above. It also has an effect that it can be corrected to a straight line orthogonal to the horizontal line.

[Brief description of drawings]

FIG. 1 is a block diagram showing an example of an image input device to which an image input method of the present invention is applied.

FIG. 2 is a perspective view showing an example of a configuration of an image input unit 1 shown in FIG.

FIG. 3 is a flowchart illustrating processing of the image input method of the present invention.

FIG. 4 is a block diagram showing an example of an image input device to which an image input method different from that shown in FIG. 3 of the present invention is applied.

FIG. 5 is a flowchart illustrating another image input method of the present invention applied to FIG.

FIG. 6 is a block diagram showing an example of a conventional image input device of this type.

[Explanation of symbols]

 1 Image Input Section 2 Carriage 3 Light Source 4 Photo Sensor 5 Guide 6 Drive Motor 7 Document Plate 8 Keyboard 9 Central Processing Section 10 Program Storage Section 10A Program Storage Section 11 Primary Image Storage Section 12 Linear Detection Means 13 Linear Table Generation Means 14 Tilt Angle determining means 15 Angle correcting means 16 Secondary image storage section 17 Corrected image storage section 18 Straight line extracting means 19 Vertical line correcting means 20 Corrected image combining means

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Claims (4)

[Claims] 1. An image storage unit that scans an image written on a document in an X direction (horizontal scanning direction) and a Y direction (vertical scanning direction) by an image input unit, converts the image into digitized image data, and inputs the image data. In the image input method to be stored in the section,
A transparent plate-shaped manuscript table and the manuscript table which are rotatable around an axis perpendicular to the image surface of the manuscript in a state where the manuscript is placed on the image input part so as to face the photo sensor of the image input part; A drive motor for rotating is provided, and a primary image storage section and a secondary image storage section are provided as the image storage section, and an image of a document placed on the document table by the image input section is displayed as image data. Converted into the primary image data and stored in the primary image storage unit as primary image data. From this primary image data, consecutive black dots are identified as straight lines, and the coordinates of the start point and the end point of the straight lines are output and the identification is performed. The tilt angle of the straight line with respect to the horizontal scanning direction of the image input unit is calculated based on the coordinates of the straight line, and the corresponding angle area of the calculated tilt angle is identified with respect to a plurality of angle areas of a predetermined tilt angle. The accumulated appearance frequencies of the identified angle areas are stored as an angle table, and a representative angle that is predetermined with respect to the angle area having the maximum appearance frequency is determined as an inclination angle by referring to the angle table. An angle correction drive signal for making the tilt angle zero is generated, and the original table is rotated in addition to the drive motor, and thereafter, the image data of the original is input again by the image input unit to input the secondary image as secondary image data. An image input method characterized by storing in a storage unit. 2. An image is stored by scanning an image written on a document by an image input unit in the X direction (horizontal scanning direction) and Y direction (vertical scanning direction), converting it into digitized image data, and inputting it. In the image input device to be stored in the section,
A transparent plate-shaped manuscript table and the manuscript table which are arranged rotatably around an axis perpendicular to the image surface of the manuscript facing the photo sensor of the image input part are externally added to the image input part. A drive motor that rotates in accordance with an angle correction drive signal, and a primary image storage unit that stores image data output as primary image data by the image input unit; and a linear component from the primary image data. The straight line detecting means for detecting and outputting the coordinates of the start point and the end point, and the tilt angle of the straight line having the start point and the end point with respect to the horizontal scanning direction are obtained based on the coordinates of the start point and the end point, and this tilt angle is given in advance. A straight line table for generating and storing a straight line table that identifies which one of the plurality of tilt angle regions corresponds, and accumulates the appearance frequency of the region of the corresponding tilt angle for each of the detected straight lines. And a tilt angle determining means that identifies the tilt angle area having the maximum appearance frequency based on the straight line table and determines a representative angle given in advance for this tilt angle area as the tilt angle. An angle correction unit that generates and outputs the angle correction drive signal that makes the determined tilt angle zero, and a secondary image output by the image input unit after the document table is rotated by the angle correction unit. A secondary image storage unit that stores data, and the primary image data is output from the image input unit in response to an externally added image data acquisition command, and the output image data is used as a primary image. During the control of storing the image in the primary image storage unit, outputting the secondary image data from the image input unit to store the secondary image data in the secondary image storage unit, and controlling the straight line detecting means. An image input apparatus characterized by comprising a processing unit. 3. A modified image storage unit for storing modified image data is provided, and the modified image storage unit according to claim 1 stores the modified image data.
The image data of the linear component is extracted from the next image data, the image data of the extracted linear component is output, and the remaining image data in which the image data of the linear component is extracted is output separately, By calculating the tilt angle of each straight line with respect to the horizontal scanning direction, it is discriminated whether or not the calculated tilt angle is within a predetermined vertical line tilt angle region, and a straight line existing in the vertical line tilt angle region is determined. For the component, the X-coordinate of the end point and the start point is corrected to a straight line component in which the value of the X coordinate of the other is matched with one of the predetermined X coordinates, and the corrected straight line image data is output. The image data of the straight line component outside the tilt angle region of the vertical line is output as it is as the corrected straight line image data, and the corrected straight line image data and the image data from which the straight line is removed are combined to obtain the corrected image data. Image input wherein the to be stored in the correction image storage unit as. 4. The image input device according to claim 2, wherein all the linear components are extracted as linear image components from the secondary image data stored in the secondary image storage unit and output as linear image data. A straight line extracting means for outputting image data excluding the straight line image data from the secondary image data as image data for retouching, and a straight line within a predetermined tilt angle range with respect to the horizontal scanning direction based on the straight line image data. A straight line component having an angle as an inclination angle is identified as a vertical line, and a predetermined X coordinate value of either the start point or the end point among the X coordinate values of the start point and the end point of the identified vertical line. To the corrected straight line image data in which the X coordinate of the other is matched, and the image data of the straight line not identified as the vertical line is directly output as the corrected straight line image data. Correcting means, modified image combining means for combining the output of the vertical line correcting means and the modifying image data output by the straight line extracting means and outputting as modified image data, and a modified image for storing the modified image data. An image input device comprising: a storage unit.