JPH04261259A - Correction device for image data - Google Patents

Abstract

PURPOSE:To simply obtain a data with excellent handling by reading two specific coordinates of an image data inputted from an image scanner, rotating the image data based on the coordinate data and correcting the data. CONSTITUTION:A graph fetched into the device through an image scanner 30 is stored in a picture memory 31. When a rotation correction command is given to a displayed graph 21 displayed on a CRT, a mouse is used to point out reference points a, b and each coordinate is fetched by a coordinate (a) extraction means 32 and a coordinate (b) extraction means 33. Then a tilt angle calculation means 34 calculates a tilt angle theta1. Then an image data rotation processing means 35 applies coordinate conversion to the image data in the memory 31 so that the tilt angle theta1 is zero around the reference point (a) and the result is returned to a picture memory 36. As a result, a display graph 24 after the correction is displayed on the CRT.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] This invention is applicable to, for example, image CA
The present invention relates to a device that processes image information, such as a D (Computer Aided Design), an electronic filing device, or a copy machine.

0002

2. Description of the Related Art In image CAD or electronic filing devices, an image scanner is used to input image information written on paper or the like into the device as image data. This image scanner captures data as binary information by scanning a document sheet that is placed on the reading surface of the scanner or driven on the reading surface of the scanner by a conveying device. Since image data is captured using the method described above, there is always some inclination with respect to the reading direction of the scanner.

[0003] In image CAD, the image data of a drawing captured from an image scanner is displayed on a CRT screen, and various operations such as cutting and pasting and editing are performed. This is often done based on a standard. For this reason, if the displayed drawing is tilted, the rotation angle for the entire displayed drawing is specified so that the drawing is horizontal or vertical, but the exact tilt angle is not known and corrections are made several times by trial and error. In many cases, the correction was completed when the approximation was reached.

[0004] Furthermore, in electronic filing devices, if the tilt of the read image data is large, it is corrected by inputting it again, but if a long time has elapsed between the first input and the discovery of the abnormality (tilt), In many cases, there is no original document, and in this case, it is necessary to re-input somewhat unclear image data after printing it out, which is a problem in that it requires a lot of effort.

[0005]

[Problem to be Solved by the Invention] Since the conventional device has an abnormal configuration, it takes a lot of effort to correct the tilt of image data read into the device, and furthermore, the problem is that the correction is not completed completely. There was a point.

The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a device that can easily correct the tilt of displayed image data.

[0007]

[Means for Solving the Problems] An image data correction device according to the present invention includes an image data capturing means for electronically capturing image data, and a primary image data holding means for temporarily holding this image data. And this 1
a coordinate extraction means for extracting reference coordinates and measured coordinates from the next image data; a tilt angle calculation means for calculating the tilt angle of the primary image data from the reference coordinates and the measured coordinates; The apparatus includes an image data rotation processing means that performs rotation processing on the primary image data so that the angle becomes zero, and a secondary image data holding means that holds the image data corrected thereby.

[0008]

[Operation] The image data correction device according to the present invention has the ability to
The reference coordinates and the measured coordinates are extracted from the next image data by the coordinate extraction means, the inclination angle of the primary image data is calculated by the inclination angle calculation means, and the image is adjusted so that the inclination angle becomes zero based on this inclination angle signal. A rotation process is applied to the primary image data using a data rotation processing means, and the image data corrected thereby is held in a secondary image data holding means.

[0009]

[Example] Example 1. An embodiment of the present invention will be described below with reference to the drawings. Figure 2
1 is a schematic block diagram showing the electrical configuration of an image CAD device according to an embodiment of the present invention. FIG. 1 is an MPU (microprocessor unit), 2 is a bus line, 3 is an interface, 4 is a ROM that stores a system program, 5 is a working RAM, 6 is a program RAM that stores an application program, and 7 is a memory that stores image data. 8 is a video RAM that receives information from the image memory 7 and stores image data corresponding to the image on the CRT display 10; 9 is a CRT controller that sends the data of the video RAM 8 to the CRT in synchronization with the CRT display; , 10 is a CRT, 11 is an image scanner controller, 12 is an image scanner that takes in image data, 13 is an optical disk controller,
14 is an optical disk device for storing image data, 15
1 is a hard disk controller, 16 is a hard disk device that holds various programs and various data for access by the optical disk device 14, and 17 is an alphabetical disk.
A keyboard for inputting numbers and various control codes, 18 a mouse, and 19 M a movement amount data corresponding to the movement amount of the mouse 18 and control data when operating point keys of the mouse 18.
This is a mouse controller that outputs in synchronization with the request signal from PU1.

The working RAM 5 includes various buffers for storing each processing data, a register buffer, address buffers for various memories, a cursor register for holding the movement value of the cursor moved by the mouse 18, and a register for storing the position indicated by the cursor. It has various management tables related to each window.

Next, the operation will be explained. Figure 4 is Figure 2
This paper explains the concept of correcting the tilt of image data incorporated in this device. In the figure, 20 is a CRT
10 is a window displayed, 21 is a drawing taken into the device through the image scanner 12 and displayed in the window 20 (only the outer frame is displayed), 22 is a scale in the X direction, 23 is a scale in the Y direction, 24 is the displayed drawing when the tilt angle is zero, a is the coordinate of the reference point, and b is the displayed drawing 2
1, c is the coordinate of the lower right end of display drawing 24,
θ1 is the inclination angle of the displayed drawing 21.

The drawing taken into the apparatus through the image scanner 12 usually has a certain degree of inclination θ1, and is displayed in the window 20 in the state shown in the display drawing 21. In image CAD, usually scales 22 and 23 are used as a reference, and cutting, pasting, and editing are performed along these scales, but in the display drawing 21, the inclination angle θ1 causes trouble in the work. Therefore, it is necessary to rotate it clockwise by an angle θ1 as shown in the display drawing 24.

This processing procedure is shown in FIG. 3, and the configuration is shown in FIG. First, in step S1, a drawing (image data) captured into the apparatus through the image scanner 12, that is, the image data capturing means 30, is stored in the image memory 7, that is, the primary image data holding means 31. Next, the data edited for CRT through video RAM 8 is transferred to CR.
Displayed at T10. When giving an instruction to correct the rotation of the display drawing 21 displayed on the CRT 10, step S2
Next, use the mouse 18 to select reference point a (Xa, Ya) and point b (
Xb, Yb) and input each coordinate into the coordinate a extraction means 32 and the coordinate b extraction means 33 in the working RAM 5.

Next, in step S3, the inclination angle calculation means 34 calculates the inclination angle θ1 by θ1=Tan-1(Yb-Ya)/(Xb-Xa). Next, in step S4, the image data rotation processing means 35 loads the image data in the image memory 7 into the working RAM 5, performs coordinate transformation around the reference point a so that the inclination angle θ1 becomes zero, and then transfers the image data to the image memory 7. That is, it is returned to the secondary image data holding means 36. As a result, the corrected display drawing 24 is displayed on the CRT 10. In this case, since the ratio of vertical and horizontal dots on the CRT screen is not 1:1, the reference point a (
The coordinates of point b (Xa, Ya) and point b (Xb, Yb) are reflected in the original image data through a predetermined ratio return.

Example 2. In addition, in the above embodiment, an example was shown in which the inclination with respect to the horizontal direction is calculated as the inclination angle θ1, but it may also be calculated using the angle θ2 formed by the reference point a in FIG. 4 and the points d and e at the upper left end of the displayed drawing. .

Example 3. In addition, in the above embodiment, for convenience of explanation, each point a, b, c, d
.

Example 4. In addition, in the above embodiment, the point a, which is the basis for calculating the inclination angle,
We have shown an example in which instructions such as b are given using the mouse 18, but as shown in FIG.
If you write the coordinates (Fig. 2) in a form that indicates the horizontal or vertical direction, you can use the machine coordinates (for example, f in Fig. 6) instead of using a mouse
Alternatively, g) in FIG. 7 can be read and the tilt can be automatically corrected.

Example 5. Furthermore, if the input paper 21 and the cover 41 serving as the background are made different colors as shown in FIG. 8, the image data captured in the image memory 7 will have a clear boundary between the input paper 21 and its surroundings. Therefore, the coordinates may be read by pointing a point along this line with the mouse 18 or by performing shape recognition by a machine. By doing this, it becomes unnecessary to write special marks indicating horizontal and vertical directions on the input paper.

Example 6. Note that, in the background cover used in the fifth embodiment, only a specific portion may be of a different color from the input paper 21, and the coordinates of that portion may be read.

Example 7. Further, in the above embodiment, an example was shown in which the reference point a was used as the image data rotation axis during correction, but even if the rotation axis is designated separately, the same effect as in the above embodiment can be achieved.

Example 8. In the above embodiment, image CAD and electronic file devices were used as examples, but even in other copy machines, even if the original is set at an angle, the machine automatically detects the inclination and corrects it to a normal state. It is also possible to achieve the same effect as the above embodiment.

[0022]

[Effects of the Invention] As described above, according to the present invention, the coordinates of two specific points in image data input from an image scanner are read, and the image data is rotated based on this coordinate data to correct the tilt. Therefore, the effect is that easily handled data can be obtained through simple processing.

[Brief explanation of the drawing]

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

FIG. 2 is a block diagram showing the electrical configuration of a device according to an embodiment of the present invention.

FIG. 3 is a flowchart showing the operation of an apparatus according to an embodiment of the present invention.

FIG. 4 is a window display diagram showing an overview of correction by the image data correction apparatus according to an embodiment of the present invention.

FIG. 5 is a diagram showing an example of an input window display and identification symbols on an input sheet of a device according to another embodiment of the present invention.

FIG. 6 is an example showing a main part of the identification symbol in FIG. 5;

FIG. 7 is another example showing a main part of the identification symbol in FIG. 5;

FIG. 8 is a diagram showing an input window display of a device according to still another embodiment of the present invention.

[Explanation of symbols]

30 Image data importing means 31 Primary image data holding means 32, 33 Coordinate extraction means 34 Inclination angle calculation means 35 Image data rotation processing means 36 Secondary image data holding means

Claims (4)

[Claims] 1. An image data capture unit that electronically captures image data using an image scanner; and a primary image data holding unit that temporarily retains the image data captured from the image data capture unit. coordinate extraction means for extracting reference coordinates and measured coordinates from the primary image data held in the primary image data holding means; and primary image data from the reference coordinates and measured coordinates extracted by the coordinate extraction means. an inclination angle calculation means for calculating an inclination angle of the image data; and an image data rotation processing means for performing a rotation process on the primary image data so that the inclination angle becomes zero based on an inclination angle signal output from the inclination angle calculation means. , and secondary image data holding means for holding the image data output from the image data rotation processing means. 2. The image data correction apparatus according to claim 1, wherein the reference coordinates and the measured coordinates are coordinates on a CRT screen respectively indicated by a mouse. 3. The reference coordinates and the measured coordinates are extracted from predetermined marks written on the image data manuscript paper using an automatic shape recognition method. Image data correction device. 4. The reference coordinates and the measured coordinates are extracted by making the image data original paper and its background different colors and using the outline of the original paper appearing on the background. Characteristic ClaimsClaim 1
image data correction device.