JPH11308437A - Inclined image corrector, inclined image correction method and storage medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correctly correct inclination as quickly as possible regardless of the kind of images. SOLUTION: In this inclined image corrector, the inclination to an original of image signals obtained by photoelectrically converting and digitally converting image information optically read from the original is corrected. In this case, it is provided with a first inclination correction program 23 for detecting the inclination of a character and correcting the inclination of the image and a second inclination correction program 24 for detecting the inclination of the edge line of the original and correcting the inclination of the image. By the control of a scanning driver 21, the first inclination correction program 23 or the second inclination correction program 24 is appropriately selected corresponding to the kind of the image or the like and the inclination is corrected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention corrects the inclination of an image signal obtained by photoelectrically and digitally converting image information optically read from an original with respect to the original.

[0002]

2. Description of the Related Art Conventionally, there has been known a technique for correcting an inclination of an image read from an original by an image reading apparatus (hereinafter, referred to as an image scanner) with respect to the original, that is, an inclination with respect to an image on an original original.

Hereinafter, a conventional example will be described in detail with reference to the drawings. FIG. 1 shows an image scanner having a document conveying function.
(Hereinafter referred to as a sheet feed scanner). In FIG. 1, a sheet feed scanner 1 and a computer device 2 having a Windows environment such as Microsoft Windows are connected. A display device 3 such as a color monitor;
A keyboard 4 for inputting a command from a user and a pointing device 5 for pointing an object displayed on the display device 3 are connected.

The computer device 2 reads the image from the sheet feed scanner 1 based on the software shown in FIG. 14, corrects the inclination of the image, and displays the corrected image on the display device 3. The software shown in FIG. 14 is a scanning driver that functions as a driver program for image reading, a low-level driver that actually functions as a driver program for communicating with the sheet feed scanner 1 and reading an image, and correcting an image inclination. Is constituted by the skew correction program.

The skew correction program includes, for example, a program for detecting the skew of a character in an image related to text data and correcting the skew by rotating the block in units of blocks, or an image related to graphic data (original document). The program which detects the inclination of the edge line and rotates the entire image to correct the inclination is used.

[0006]

Conventionally, however, only one of the above-described inclination correction program for detecting the inclination of a character and the inclination correction program for detecting the inclination of an edge line of a document is used. Thus, it is configured to correct the inclination of various images.

For this reason, when a tilt correction program of a method for detecting the tilt of a character is used, the tilt is detected in units of blocks. In some cases, it is not possible to correctly correct inclination of an image related to graphic data, for example, a line that is tilted is detected and the originally inclined line is erroneously corrected.

In addition, when a skew correction program for detecting the skew of an edge line of a document is used, a skew correction program for detecting the skew of a character when an image related to text data is corrected for skew. When the processing speed is slower than the case where the inclination is corrected, and the line mixed as noise in the image of the text data related to the facsimile communication is erroneously detected as the edge line of the image, and the inclination is corrected by mistake. There was also.

Furthermore, in the conventional tilt correction processing, even when the image size is large and the tilt correction processing takes a long time, the tilt correction processing cannot be canceled (canceled).

The present invention has been made under such a background, and an object of the present invention is to make it possible to correct a tilt correctly and as quickly as possible regardless of the content of an image. Another object of the present invention is to enable the inclination correction process to be stopped arbitrarily.

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an image signal optically read from a document by photoelectric conversion and digital conversion. The tilt image correcting apparatus for correcting includes a plurality of tilt image correcting units having different correction methods, and a selecting unit for selecting an appropriate tilt image correcting unit from the plurality of tilt image correcting units according to the content of an image. ing.

The present invention also provides a tilt image correction method for correcting the tilt of an image signal obtained by photoelectrically converting and digitally converting image information optically read from a document with respect to the document. The method includes a plurality of different tilt image correction steps and a selection step of selecting an appropriate tilt image correction step from the plurality of tilt image correction steps according to the content of the image.

Further, the present invention is a storage medium for storing a program for correcting a tilt of an image signal obtained by photoelectrically converting and digitally converting image information optically read from a document with respect to the document. The program includes a plurality of tilt image correction routines having different correction methods,
A selection routine for selecting an appropriate tilt image correction routine from the plurality of tilt image correction routines according to the content of the image. In the present invention, the plurality of skewed image correction means, steps, and routines include first skewed image correction means, steps, and routines for detecting a skew of a character and correcting the skew of an image, and an edge line of the document. And a second tilt image correcting means / step / routine for detecting the tilt of the image and correcting the tilt of the image.

Further, according to the present invention, the selecting means, the step,
The routine selects an inclined image correcting means, a process, and a routine based on the contents of the set image.

Further, according to the present invention, the selecting means, the step,
The routine selects the first tilted image correction means / step / routine when text is set as the content of the image, and selects the second tilted image when the content of the image other than the text is set. Is selected.

Further, according to the present invention, the selecting means, the step,
The routine includes detecting means, a step, and a routine for generating an image histogram and detecting an edge line of the document, and detecting the second inclination when the edge line is detected by the detecting means, the step, and the routine. The image correction means / step / routine is selected, and if the edge line is not detected, the first tilt image correction means / step / routine is selected.

Further, according to the present invention, the selecting means, the step,
The routine includes extraction means, steps, and routines for extracting characters from an image, and selects the first inclined image correction means, steps, and routines when characters are extracted by the extraction means, steps, and routines. If no character is detected, the second tilt image correction means / step / routine is selected.

Further, the present invention includes an instruction means, a step, and a routine for instructing whether or not to cancel the inclination correction according to the size of the image before correcting the inclination of the image.

Further, in the present invention, the indicating means, the step,
The routine includes a display unit, a process, and a routine for displaying a message indicating that it takes a long time to correct the tilt when the size of the image is equal to or larger than a predetermined value.

Further, according to the present invention, the tilt image correction device (ie, tilt image correction means, step, routine) photoelectrically and digitally converts image information optically read from a document and outputs it as an image signal. Installed in (or executed by) a computer device connected to the image reading device.

Further, according to the present invention, the tilt image correction device (ie, tilt image correction means, step, routine) photoelectrically and digitally converts image information optically read from a document and outputs it as an image signal. (Or executed by a computer device).

[0022]

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

FIG. 1 is a system configuration diagram of a data processing system to which a tilt image correction device according to the present invention is applied.
A sheet feed scanner 1 and a computer device 2 having a Windows environment such as Microsoft Windows
Is connected. The computer device 2 includes a display device 3 such as a color monitor, a keyboard 4 for inputting a command from a user, and a pointing device 5 for pointing an object displayed on the display device 3.
And are connected.

The sheet feed scanner 1 converts an optical image obtained by optically scanning a document into an electric image signal by a photoelectric conversion element (image sensor) such as a CCD.
This image signal is further converted into a digital signal by an A / D converter and is transferred to an external computer device 2. As shown in FIG. 2, a document to be read is fed to a reading position. And a start button 12 for starting a reading operation.

The computer device 2 reads an image signal from the sheet feed scanner 1 and corrects the inclination of the image.
It has a function of displaying an image whose inclination has been corrected on the display device 3. When correcting the inclination of the image, the computer device 2 performs a correction process based on the application software shown in FIG.

The software for correcting the tilt image includes a scanning driver 21 functioning as a driver program for image reading, and a low-level driver functioning as a driver program for reading an image read by the sheet feed scanner 1 into the computer device 2. 22,
It comprises first and second skew correction programs 23 and 24 for correcting the inclination of the read image with respect to the image on the original document.

The first skew correction program 23 is configured to detect the skew of a character in an image and to correct the skew by rotating the block in units of a block. The inclination of the edge line is detected, and the inclination is corrected by rotating the entire image.

As shown in FIG. 1, the computer device 2
The scanning driver 21 for driving the sheet feed scanner 1 is started by the computer device 2 with the sheet feed scanner 1 connected to the computer. Then, the original is inserted into the paper supply port 11 of the sheet feed scanner 1, and the start button 12 is pressed to start reading the original. Then, the read document image is read into the computer device 2 by the low-level driver 22, and
One of the first and second skew correction programs 23 and 24 is selected according to the content of the image, that is, the type of the image, the presence / absence of an edge line of the document, the presence / absence of a character, and the like. The skew of the image is corrected by the skew correction program 23 or the second skew correction program 24, and the image is displayed on the display device 3.

[First Embodiment] Next, the image inclination correction processing in the first embodiment will be described with reference to the flowcharts of FIGS.

The operator first selects the scanning driver 2
1 is started (step S1). Then, FIG. 6 for setting the type of image by the scanning driver 21.
Is displayed, the operator selects and sets one of color, gray, text, and black and white image types (step S).
2). Here, the text indicates that the image on the document is composed of characters. When the type of the image is set, a dialog box for setting the size of the document as shown in FIG. 7 is displayed, and the size of the document is set on the dialog box (step S3). ). When the size of the document is set, the dialog box shown in FIG. 8 is displayed, and the range of the image to be actually read on the dialog box is set (step S4). 8, 81 indicates the size of the document set in step S3, and 82 indicates the size of the document in step S4.
Indicates the reading range set by.

Next, the user presses the start button 12 of the sheet feed scanner 1 to start reading the original (step S5). At this time, the read image data is read into the computer device 2 by the low-level driver 22. Then, the scanning driver 21 determines whether the type of the image set in step S2 is text (step S6). As a result, if it is a text, it is determined whether or not the reading range (read image size) set in step S4 is larger than a specified size (step S7). As a result, if the size is larger than the specified size, a dialog box shown in FIG. 9 is displayed so that the operator can select whether or not to execute the tilt correction even if it takes a certain time for the tilt correction (step S8) It is determined whether the OK button has been selected (step S9).

As a result, when the OK button is selected, the image data read in step S5 is
The inclination of the character is detected by the first inclination correction program 23 to correct the inclination of the image (step S10), and the image data subjected to the inclination correction is displayed (step S1).
1). On the other hand, if the cancel button is selected on the dialog box of FIG. 9, the image data read in step S5 is displayed without performing tilt correction (step S11). If it is determined in step S7 that the image size is equal to or smaller than the specified size,
Without displaying the dialog box of step S5, the image data read in step S5 is corrected for inclination by the first inclination correction program 23 (step S1).
2) Display (step S11).

If it is determined in step S6 that the image is of a type other than text, the original size set in step S3 and the reading range (read image size) set in step S4 match. It is determined whether or not to perform (step S13). As a result, if they do not match, the image data read in step S5 is displayed without performing tilt correction (step S18).

On the other hand, if the document size matches the read image size, it is determined whether the read image size is larger than a predetermined size (step S14). As a result, if the size is larger than the predetermined size, a dialog box shown in FIG. 9 is displayed for asking the operator whether or not to execute the inclination correction even if the inclination correction requires a certain amount of time (step S15). ), It is determined whether or not the OK button has been selected (step S16).

As a result, when the OK button is selected, the image data read in step S5 is
The inclination of the edge line of the document is detected by the second inclination correction program 24 to correct the inclination of the image (step S1).
7) Display the image data whose inclination has been corrected (step S18). On the other hand, if the cancel button is selected on the dialog box of FIG. 9, the image data read in step S5 is displayed without performing tilt correction (step S18). Step S1
If it is determined in step S4 that the read image size is smaller than the predetermined size, the image data read in step S5 is subjected to the second tilt correction without displaying the dialog box in FIG. The inclination is corrected by the program 24 (step S19) and displayed (step S1).
8).

As described above, an appropriate first or second skew correction program is automatically selected according to the type of image, and skew correction of the image is performed by the selected skew correction program. Therefore, the tilt correction can be performed correctly and as quickly as possible regardless of the type of the image. Further, the inclination correction processing can be arbitrarily stopped using the dialog box shown in FIG.

[Second Embodiment] In the first embodiment,
Based on the type of image set by the operator,
Alternatively, the second inclination correction program is selected. However, in the second embodiment, a histogram of an image is created, an edge line of the document is detected on the histogram, and the first or the first is determined based on the presence or absence of the edge line of the document. The second inclination correction program is selected.

Next, the image inclination correction processing according to the second embodiment will be described with reference to the flowcharts of FIGS.

The operator first selects the scanning driver 2
1 is started (step S21). Then, a dialog box as shown in FIG. 6 for setting the image type is displayed by the scanning driver 21, and the operator can select one of the color, gray, text, and black and white image types. And set it (Step S2
2). When the type of the image is set, a dialog box for setting the size of the document as shown in FIG. 7 is displayed, and the size of the document is set on the dialog box (step S23). ). When the size of the document is set, the dialog box shown in FIG. 8 is displayed, and the range of the image to be actually read on the dialog box is set (step S24).

Next, the user presses the start button 12 of the sheet feed scanner 1 to start reading the original (step S25). At this time, the read image data is read into the computer device 2 by the low-level driver 22. Then, the scanning driver 21 creates a histogram of the read image data (step S2).
6) The document edge line is detected (step S27), and it is determined whether an edge line of the document is detected (step S28).

As a result, if no edge line is detected, it is determined whether or not the read range (read image size) set in step S24 is larger than a specified size (step S29). As a result, if the size is larger than the specified size, a dialog box shown in FIG. 9 is displayed for asking the operator whether or not to execute the tilt correction even if a certain amount of time is required for the tilt correction (step S3).
0), it is determined whether the OK button is selected (step S31).

As a result, when the OK button is operated, the inclination of the character is detected by the first inclination correction program 23 to correct the image inclination of the image data read in step S25. (Step S32), the image data subjected to the inclination correction is displayed (Step S32).
33). On the other hand, if the cancel button is selected on the dialog box of FIG. 9, the image data read in step S25 is displayed without performing the inclination correction (step S33). If it is determined in step S29 that the read image size is equal to or smaller than the specified size, the dialog box shown in FIG.
The image data read in step S25 is corrected for inclination by the first inclination correction program 23 (step S34) and displayed (step S33).

If it is determined in step S28 that the edge line of the document has not been detected, the process proceeds to step S2.
It is determined whether or not the document size set in Step 2 matches the reading range (read image size) set in Step S23 (Step S35). As a result, if they do not match, the image data read in step S25 is displayed without performing tilt correction (step S40).

On the other hand, if the document size matches the read image size, it is determined whether the read image size is larger than a predetermined size (step S36). As a result, if the size is larger than the predetermined size, a dialog box shown in FIG. 9 is displayed so that the operator can select whether or not to execute the inclination correction even if it takes a certain time for the inclination correction (step S37), it is determined whether the OK button is selected (step S38).

As a result, when the OK button is selected, the inclination of the edge line of the original is detected by the second inclination correction program 24 for the image data read in step S25, and the inclination of the image is detected. Is corrected (step S39), and the image data subjected to the inclination correction is displayed (step S40). On the other hand, when the cancel button is selected on the dialog box of FIG. 9, the image data read in step S25 is displayed without performing the inclination correction (step S40). If it is determined in step S36 that the read image size is smaller than the predetermined size, the image data read in step S25 is added to the second image data without displaying the dialog box shown in FIG. Is corrected by the tilt correction program 24 (step S41) and displayed (step S41).
40).

As described above, in the second embodiment, since the edge line of the document is detected based on the histogram of the image, when the document received by facsimile communication is read, it is mixed as noise in the read image. This can reliably eliminate the problem of erroneously detecting a line that is present as an edge line of a document and erroneously correcting the inclination (this problem is also solved in the first and third embodiments described later). However, the second embodiment is more reliable). In the second embodiment, when the character recognition processing is unnecessary, the setting processing of the image type can be omitted (the same applies to the third embodiment).

[Third Embodiment] In the third embodiment,
A process of extracting a character from the read image data is performed. If the character is extracted, the first inclination correction program 23 is selected. If the character is not extracted, the first inclination correction program 23 is selected.
The second inclination correction program 24 is selected.

Next, the image inclination correction processing according to the third embodiment will be described with reference to the flowcharts of FIGS.

The operator first selects the scanning driver 2
1 is started (step S51). Then, a dialog box as shown in FIG. 6 for setting the image type is displayed by the scanning driver 21, and the operator can select one of the color, gray, text, and black and white image types. And set it (step S5).
2). When the type of the image is set, a dialog box for setting the size of the document as shown in FIG. 7 is displayed, and the size of the document is set on the dialog box ( Step S53). When the size of the document is set, the dialog box shown in FIG. 8 is displayed, and the range of the image to be actually read on the dialog box is set (step S5).
4).

Next, the user presses the start button 12 of the sheet feed scanner 1 to start reading the original (step S55). At this time, the read image data is read into the computer device 2 by the low-level driver 22. Then, the scanning driver 21 performs a character extraction process on the read image data (step S56), and determines whether a character has been extracted (step S57).

As a result, if a character is extracted, the reading range (read image size) set in step S54
Is larger than the specified size (step S
58). As a result, if the size is larger than the specified size, a dialog box shown in FIG. 9 is displayed so that the operator can select whether or not to execute the tilt correction even if it takes a certain time for the tilt correction (step S59), it is determined whether the OK button is selected (step S60).

As a result, when the OK button is selected, the image data read in step S55 is detected by the first tilt correction program 23 to detect the character tilt and correct the image tilt. (Step S61), the image data whose inclination has been corrected is displayed (Step S61).
62). On the other hand, if the cancel button is selected on the dialog box of FIG. 9, the image data read in step S55 is displayed without performing the inclination correction (step S62). If it is determined in step S58 that the read image size is equal to or smaller than the specified size, the dialog box shown in FIG.
The image data read in step S55 is corrected for inclination by the first inclination correction program 23 (step S63), and is displayed (step S62).

If it is determined in step S57 that no character has been extracted, it is determined whether the document size set in step S53 matches the reading range (read image size) set in step S53. Is determined (step S64). As a result, if they do not match, the image data read in step S55 is displayed without performing tilt correction (step S69).

On the other hand, if the document size matches the read image size, it is determined whether the read image size is larger than a predetermined size (step S65). As a result, if the size is larger than the predetermined size, a dialog box shown in FIG. 9 is displayed so that the operator can select whether or not to execute the inclination correction even if it takes a certain time for the inclination correction (step S66), it is determined whether or not the OK button has been selected (step S67).

As a result, when the OK button is selected, the inclination of the edge line of the original is detected by the second inclination correction program 24 for the image data read in step S55, and the inclination of the image is determined. Is corrected (step S68), and the image data subjected to the inclination correction is displayed (step S69). On the other hand, if the cancel button is selected on the dialog box of FIG. 9, the image data read in step S54 is displayed without performing tilt correction (step S69). If it is determined in step S64 that the read image size is equal to or smaller than the predetermined size, the image data read in step S54 is added to the second image data without displaying the dialog box shown in FIG. Is corrected by the tilt correction program 24 (step S70) and displayed (step S70).
69).

The present invention is not limited to the above embodiment, but can be applied to, for example, a system using an image scanner without a document conveying function. It is also possible to mount a plurality of types of tilt correction functions having different correction methods on the image canner.

Further, as means for canceling the inclination correction, the cancel is instructed from the beginning by a mechanical button switch or the like without being passively instructed by the dialog box shown in FIG. Is also good.
In addition, for example, the image sizes are classified into large, medium, and small, guidance is displayed for an approximate inclination correction processing time corresponding to the large, medium, and small image sizes, and an instruction is given as to whether or not to cancel the inclination correction. It is also possible.

[0058]

As described above, according to the present invention, image information optically read from a document is subjected to photoelectric conversion,
And a tilt image correcting device for correcting the tilt of the image signal obtained by the digital conversion with respect to the original, wherein a plurality of tilt image correcting means having different correction methods and an image content ( Selection means for selecting an appropriate tilt image correction means according to the type of image, etc.), so that tilt correction can be performed correctly and as quickly as possible regardless of the type of image. In addition, according to the present invention, the inclination correction process is arbitrarily stopped before the inclination of the image is corrected, because the instructing means for instructing whether to stop the inclination correction according to the size of the image is provided. Becomes possible.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of a data processing system to which a tilt image correction device according to the present invention (and the related art) is applied.

FIG. 2 is an external view of a sheet feed scanner.

FIG. 3 is a functional block diagram showing a schematic configuration of tilt correction software according to the present invention.

FIG. 4 is a flowchart illustrating a tilt correction process according to the first embodiment of the present invention.

FIG. 5 is a flowchart continued from FIG. 4;

FIG. 6 is a diagram showing a dialog box for setting an image type.

FIG. 7 is a diagram illustrating a dialog box for setting a document size.

FIG. 8 shows a dialog for setting an image reading range.
It is a figure showing a box.

FIG. 9 is a diagram showing a dialog box for instructing whether to cancel inclination correction.

FIG. 10 is a flowchart illustrating a tilt correction process according to a second embodiment of the present invention.

FIG. 11 is a flowchart continued from FIG. 10;

FIG. 12 is a flowchart illustrating a tilt correction process according to a third embodiment of the present invention.

FIG. 13 is a flowchart continued from FIG. 12;

FIG. 14 is a functional block diagram showing a schematic configuration of conventional software for correcting inclination.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 sheet feed scanner 2 computer device 3 display device 5 pointing device 21 scanning driver 22 low level driver 23 first tilt correction program 24 second tilt correction program

Claims (30)

[Claims] 1. A tilt image correcting apparatus for correcting a tilt of an image signal obtained by photoelectrically converting and digitally converting image information optically read from a document with respect to the document, wherein a plurality of tilts having different correction methods are provided. A tilt image correction apparatus comprising: an image correction unit; and a selection unit that selects an appropriate tilt image correction unit from the plurality of tilt image correction units according to the content of an image. 2. The image processing apparatus according to claim 1, wherein the plurality of skewed image correction units detect a skew of a character to correct the skew of the image, and a skew of the image by detecting a skew of an edge line of the document. 2. The tilt image correcting apparatus according to claim 1, further comprising a second tilt image correcting unit that corrects the tilt angle. 3. The tilt image correction device according to claim 1, wherein the selection unit selects the tilt image correction unit based on the content of the set image. 4. The selecting means selects the first tilt image correcting means when text is set as the content of the image, and selects the first tilted image correcting means when the content of the image other than the text is set. 2. The tilt image correction device according to claim 1, wherein the second tilt image correction unit is selected. 5. The image processing apparatus according to claim 1, wherein the selection unit includes a detection unit configured to generate a histogram of an image to detect an edge line of the document, and to detect the edge line by the detection unit when the detection unit detects the edge line. 2. The tilt image correction device according to claim 1, wherein a correction unit is selected, and when the edge line is not detected, the first tilt image correction unit is selected. 6. The selecting means includes an extracting means for extracting a character from an image, and when a character is extracted by the extracting means, selects the first tilt image correcting means and detects a character. 2. The tilt image correction device according to claim 1, wherein the second tilt image correction unit is selected when the tilt image correction is not performed. 7. The tilt image correcting apparatus according to claim 1, further comprising an instruction unit for instructing whether to stop the tilt correction according to the size of the image before correcting the tilt of the image. 8. The tilt image according to claim 1, wherein the instruction unit includes a display unit that displays a message indicating that it takes a long time to correct the tilt when the size of the image is equal to or larger than a predetermined value. Correction device. 9. The computer according to claim 1, wherein the tilt image correction device is mounted on a computer connected to an image reading device that performs photoelectric conversion and digital conversion of image information optically read from a document and outputs the image information as an image signal. The tilt image correction device according to claim 1, wherein: 10. The image reading apparatus according to claim 1, wherein the tilt image correction device is mounted on an image reading device that performs photoelectric conversion and digital conversion of image information optically read from a document and outputs the image information as an image signal. Item 3. The tilt image correction device according to Item 1. 11. A tilt image correction method for correcting a tilt of an image signal obtained by photoelectrically converting and digitally converting image information optically read from a document with respect to the document, wherein a plurality of tilts having different correction methods are provided. A tilt image correcting method, comprising: an image correcting step; and a selecting step of selecting an appropriate tilt image correcting step from the plurality of tilt image correcting steps according to the content of an image. 12. The method according to claim 12, wherein the plurality of skewed image correction steps include: a first skewed image correction step of detecting a skew of a character to correct the skew of the image; 12. The tilt image correction method according to claim 11, further comprising a second tilt image correction step of correcting the tilt image. 13. The tilt image correction method according to claim 11, wherein the selection step selects a tilt image correction step based on the content of the set image. 14. The selecting step selects the first tilted image correction step when text is set as the content of the image, and selects the first tilted image correction step when the content of the image other than the text is set. The tilt image correction method according to claim 11, wherein the second tilt image correction step is selected. 15. The method according to claim 1, wherein the selecting step includes a detecting step of creating an image histogram and detecting an edge line of the document, and when the edge line is detected by the detecting step, the second tilted image is detected. 12. The tilt image correction method according to claim 11, wherein a correction step is selected, and when the edge line is not detected, the first tilt image correction step is selected. 16. The method according to claim 1, wherein the selecting step includes an extracting step of extracting a character from an image, and when the extracting step extracts a character, selecting the first inclined image correcting step;
12. The tilt image correction method according to claim 11, wherein if no character is detected, the second tilt image correction step is selected. 17. The tilt image correction method according to claim 11, further comprising an instruction step of instructing whether to stop the tilt correction according to the size of the image before correcting the tilt of the image. 18. The method according to claim 1, wherein the instructing step includes a displaying step of, when the size of the image is equal to or larger than a predetermined value, displaying a message that it takes a long time to correct the tilt.
1. The tilt image correction method according to 1. 19. The tilt image correcting step and the selecting step,
12. The tilted image according to claim 11, wherein the tilted image is mounted on a computer connected to an image reading device that photoelectrically and digitally converts image information optically read from a document and outputs the converted image signal. Correction method. 20. The tilt image correcting step and the selecting step,
12. The tilt image correction method according to claim 11, wherein the tilt information correction method is mounted on an image reading device that photoelectrically converts and digitally converts image information optically read from a document and outputs the image information as an image signal. 21. A storage medium for storing a program for correcting a tilt of an image signal obtained by photoelectrically converting and digitally converting image information optically read from a document with respect to the document, wherein: The program includes: a plurality of tilt image correction routines having different correction methods; and a selection routine for selecting an appropriate tilt image correction routine from the plurality of tilt image correction routines according to the content of an image. Storage media. 22. The plurality of tilt image correction routines,
A first skewed image correction routine for detecting the skew of characters and correcting the skew of the image, and a second skewed image correction routine for detecting the skew of the edge line of the document and correcting the skew of the image 22. The storage medium according to claim 21, wherein: 23. The storage medium according to claim 21, wherein said selection routine selects an inclined image correction routine based on the contents of a set image. 24. The selection routine selects the first tilted image correction routine when text is set as the content of an image, and selects the first tilted image correction routine when the content of an image other than text is set. 22. The storage medium according to claim 21, wherein the second tilt image correction routine is selected. 25. The selection routine includes a detection routine for creating an image histogram and detecting an edge line of the original, and when the edge line is detected by the detection routine, the second inclined image 22. The storage medium according to claim 21, wherein a correction routine is selected, and when the edge line is not detected, the first tilt image correction routine is selected. 26. The selection routine includes an extraction routine for extracting a character from an image. When a character is extracted by the extraction routine, the first inclination image correction routine is selected, and a character is detected. 22. The storage medium according to claim 21, wherein the second tilt image correction routine is selected when the second tilt image correction routine is not performed. 27. The storage medium according to claim 21, further comprising an instruction routine for instructing whether to stop the inclination correction according to the size of the image before correcting the inclination of the image. 28. The storage medium according to claim 21, wherein said instruction routine includes a display routine for displaying a message that it takes a long time to correct the tilt when the size of the image is equal to or larger than a predetermined value. . 29. The tilt image correction routine and the selection routine are executed by a computer connected to an image reading device that performs photoelectric conversion and digital conversion of image information optically read from a document and outputs the image information as an image signal. The storage medium according to claim 21, wherein the storage medium is used. 30. The tilt image correction routine and the selection routine are executed by an image reading device that performs photoelectric conversion and digital conversion of image information optically read from a document and outputs the image information as an image signal. Claim 21
The storage medium according to the above.