JPH03216773A - Picture rotation processing method for display device - Google Patents

Abstract

PURPOSE:To easily and accurately correct the direction of a displayed picture as desired by making the degree of rotation of the picture overlap this picture to optionally set a straight line and instructing a degree of rotation to set the straight line in the prescribed direction on a screen. CONSTITUTION:A picture processing system consists of a CPU 1, a main storage 2, a graphic display device 3, a display memory 4, an input device 5, a graphic printer 6, a graphic input device 7, and a picture processing circuit 9. A straight line is set on a displayed picture to point a specific straight line part to be set horizontal, for example, for the picture. At the same time, an instruction is produced in order to set the straight line on a screen. Thus the picture is rotated at an angle so that the straight line is set horizontal on the screen. In such a constitution, the direction of the displayed picture can be easily and accurately corrected as desired.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a display device that displays image data processed by a computer on a CRT or the like, and in particular, to a display device that displays image data processed by a computer on a CRT or the like. Concerning an image rotation processing method that focuses on the interface.

BACKGROUND ART To appropriately rotate an image displayed on a display device, an operator operates an input device such as a keyboard or a mouse (pointing device) in a predetermined procedure to input an instruction to rotate the image. Specifically, typical methods include inputting a rotation angle numerically and a method of rotating stepwise by the minimum unit of rotation angle.

Problem to be Solved by the Invention For example, a document such as a drawing is read by an image reader, the image data is displayed on a display device, the image is viewed and confirmed, and various incidental inputs are added, and the image data is transferred to an electronic file device. Assume a situation where you are registering. When an image is displayed on a display device, the orientation of the image may be incorrect (tilted). This may be due to the fact that the original image itself is tilted with respect to the sides of the paper, or the original is tilted when it is set in the image league.

Therefore, it is assumed that the tilt of the image is corrected before registering it in the electronic file device. This can be done by rotating the displayed image as appropriate and correcting the orientation of the image on the display. In this case, the conventional method of inputting the rotation angle numerically is inappropriate, and the rotation instruction must be given using another conventional method (rotating the image little by little while looking at the screen). In the case of this method, if there is a long, clear horizontal line in the image and the line is parallel to the horizontal edge of the display screen, it is not difficult to instruct the rotation while viewing the screen. Generally, adjusting the image by rotating the image while looking at the screen to adjust it to the desired orientation is troublesome and not accurate. In particular, when considering the case where the lines of a certain part of a certain part in a plurality of drawings need to be aligned, conventional methods cannot effectively handle the situation.

This invention was made in view of the above-mentioned conventional problems, and its purpose is to provide an image rotation processing method that allows the user to easily and accurately correct the orientation of a displayed image as desired. It's about doing.

Means for Solving the Problem Therefore, in the present invention, an input means that can indicate an arbitrary point on the screen is used, and an operator can set a straight line in an arbitrary direction at an arbitrary position on the displayed image. , the image is rotated by the data processing means so that the straight line is oriented in a predetermined direction on the screen.

Indicate which straight line part of the displayed image is to be made horizontal, for example, by setting the straight line on the image using the input means, and at the same time instructing that the straight line be made horizontal on the screen. .

Then, the data processing means operates to rotate the image by an angle that makes the straight line horizontal on the screen.

Embodiment FIG. 3 shows a schematic configuration of an image processing system to which the image rotation processing method according to the present invention is applied.

1 is a central processing unit in charge of overall control, 2 is a main memory for storing programs and data, 3 is a graphic display device using a CRT, etc., and 4 is image data to be displayed on the display device 3. 5 is an input device including a keyboard and mouse; 6 is a graphic printing device such as a laser beam printer; 17 is a graphic input device such as an image reader; 9 is a high-speed image data rotation processing device, etc. This is an image processing circuit executed by

The main storage device 2 stores an image rotation program IO, and this program IO includes a rotation angle calculation section 11, a reference line drawing section 12, a cursor drawing section 13, etc., which function as detailed below. and is executed by the central processing unit 1 as follows.

FIG. 1 shows the flow of a series of processes including an image rotation processing method according to an embodiment of the present invention, and FIG. 2 shows an example of a display image during the operation process.

First, in the stenops 101 and 102, image data read by the graphic input device 7 is stored in the display memory 4 and displayed on the display device 3. An example of the displayed image at this time is ``■'' in FIG. 2, and as shown in the figure, the image addition of the original is tilted upward to the right with respect to the screen addition. A case of correcting this inclination will be explained as an example.

The operator operates the input device 5 while looking at the display of ■, points an appropriate point 4l on the display image with the cursor 40 as shown in the next ■, and then moves the point 42 with the cursor 40 as shown in ■. , and draw a straight line starting and ending at 41 and 42 on screen I.
to draw. Here, the points 41 and 42 indicated by the cursor 40 are set so that the straight lines 41 and 42 become horizontal reference lines for image addition.
Decide on 42. The above is steps 103 and 104 in Figure 1.
It is.

Once the horizontal reference line for image addition is set as described above, the central processing unit 1 executes the program of the rotation angle calculation unit l1 in step 105, and sets the horizontal reference lines 41 and 42 for image addition parallel to the horizontal line of screen I. Find the rotation angle θ required to achieve this. In the next step 106, the image processing circuit 9 is used to rotate the displayed image data by θ. For example, if the upper left corner of screen I is the origin (0.0) and the coordinate (xotyo) is the center of rotation,
Coordinates after rotating a certain point (x.y) on the screen (
XI ly+ ) is expressed by the following equation.

After rotating the image data using the above calculation,
In step 107, the image data after the rotation process is displayed on the display device 3. The slope of the image addition relative to the screen addition has now been corrected as shown in Figure 2 (2). Image data whose tilt has been corrected in this manner can be printed by the printing device 6 and transferred to an electronic file device (not shown) for registration.

In the above embodiment, the straight line set with the cursor is aligned horizontally on the screen, but the present invention is not limited to this, and the number of straight lines on the screen can be freely selected. can do.

Effects of the Invention As explained in detail above, according to the present invention, the extent to which the displayed image is rotated is determined by overlapping the image and setting a straight line arbitrarily, and the straight line is set at a predetermined position on the screen. Since the amount of rotation is instructed in the form of a desired orientation, tasks such as correcting the orientation of the displayed image according to the desired orientation become easier and more accurate than before.

[Brief explanation of drawings]

FIG. 1 is a flowchart of an image rotation processing method according to an embodiment of the present invention, FIG. 2 is a diagram showing an example of a change in a stopped screen by implementing the same method, and FIG. 3 is an image processing system to which the present invention is applied. FIG. Add...Image, I...Screen, 40...Cursor, 4
1. 42... Straight line (horizontal reference line).

Claims (1)

[Claims] Display the image data written in the display memory on the screen of the display device, and use an input means that can specify any point on the screen to move the image data to any position on the displayed image in any direction. An image rotation processing method for a display device, wherein an operator sets a straight line, and data processing means rotates the image so that the straight line is oriented in a predetermined direction on the screen.