JPH0344307B2 - - Google Patents

Description

TECHNICAL FIELD The present invention relates to an image enlargement display device, and more particularly to an image enlargement display device that enlarges an image displayed on a cathode ray tube (CRT) screen based on image data.

In recent years, office automation (OA) and factory automation (FA) have made remarkable progress, but the core equipment common to both OA and FA is a personal computer. As is well known, personal computers are controlled by microcomputers and have man-machine interfaces, mainly keyboards and CRTs, and are now capable of manipulating and processing data stored on floppy disks. There is.

In addition to information such as letters and numbers on the CRT screen,
Tables, graphs, images, etc. can also be displayed, and image display plays an extremely important role, especially in FA.
CRT screens used in personal computers are usually about 14 inches, so if the image is complex, the details can be seen by enlarging the image.

(Prior Art) Conventionally, this type of image enlargement display calculates only the image data read out from the image data storage means at a designated enlargement rate, and then displays the result.
This is done by displaying it on a CRT screen.

With this technique, the frame data for displaying the coordinates of the image on the CRT screen is not enlarged, so for example, the logic circuit diagram shown in Figure 1 is
As shown in the figure, the image is enlarged and displayed, and there is a drawback that it is difficult to understand which part of the entire image the enlarged area corresponds to.

Other conventional image enlargement displays simultaneously display the enlarged image and the entire image on a CRT screen, as shown in Figures 3 and 4, with the support of special hardware and software. This is done using multiple windows. Furthermore, there is a technique that uses a command to indicate the position of the enlarged image in the entire image.

However, this method has the disadvantage that the enlarged image becomes smaller because the entire image is displayed simultaneously, and special hardware/software support is also required, making the device expensive.

(Objective of the Invention) An object of the present invention is to provide a convenient and inexpensive image enlargement display device that does not impair the enlargement ratio and allows the position of the enlarged image in the entire image to be always known.

(Structure of the Invention) The apparatus of the present invention is an image enlargement display device for enlarging an image displayed on a cathode ray tube screen based on image data, wherein the image data and the image based on the image data are displayed on the cathode ray tube screen. an image data storage means that stores frame data in advance for displaying the coordinates; a display instruction means for specifying the corresponding image data for displaying the image and the coordinates; an image data reading means for reading image data and frame data corresponding to the image data from the image data storage means; and an image data reading means for instructing an enlarged area and enlargement rate on the cathode ray tube screen when the display is enlarged. enlargement instruction means; image data calculation means for performing calculations on the read image data and frame data based on the enlargement ratio when there is the enlargement instruction; and an output of the image data reading means or the image data calculation means. and an image display means for displaying the image and the coordinates based on the image.

(Example) Next, an example of the present invention will be described in detail with reference to the drawings.

FIG. 6 is a block diagram showing one embodiment of the present invention.

This embodiment includes a keyboard KB, trackball TB, processor PU, floppy disk FD, main memory MM, and video memory.
It consists of VM and CRT.

A plurality of sets of image data and frame data for displaying the coordinates of an image on a CRT screen based on the image data are stored in advance in the floppy disk FD. Further, image data of components constituting the image is also stored as necessary.

First, to display image data as an image on the CRT screen, enter the command (LOAD) and the image data designation from the keyboard KB. This command LOAD is decoded by the processor PU, and the processor PU transfers the specified image data and corresponding frame data to the floppy disk.
Reads from FD to main memory MM and sends them to video memory VM. video memory VM
Since the image data sent to is in vector format, the processor PU converts it into a CRT screen display image and displays it on the CRT screen.
The image at this time is as shown in FIG. 1, for example.

Next, when you want to enlarge a part of the image displayed in this way, type the command (WINDOW) for that purpose from the keyboard KB. When the command WINDOW is input to the processor PU,
Transfer current cursor position via video memory VM
Display on CRT screen.

The operator of the personal computer moves the trackball TB to move the cursor on the CRT screen to determine the part of the image that he or she wishes to enlarge. Trackball TB is, as is well known, L.
Two cylindrical rod shafts arranged in a letter shape, a sphere that always maintains contact points with the two rod shafts, and when the sphere is rolled in a free direction in the palm of the hand, the two rods are connected to each other through the contact points. It is a type of pointing device that consists of a means for detecting the force applied to the rod shaft. The shaft rotation speed detected by the two rod shafts is determined by the processor.
The rotation speed is transmitted to the PU, and the processor PU converts this number of rotations into a moving distance of the cursor, and displays a cursor corresponding to the rolling of the track ball TB on the CRT screen via the video memory VM.

Once the part of the image to be enlarged and displayed is determined in this way, that part is fixed by pressing down on a predetermined key on the keyboard KB. Next, operate the trackball TB twice in succession to determine the magnification ratio. In other words, the second trackball TB for the cursor movement distance determined by the first trackball TB operation.
The ratio of the cursor movement distance determined by the operation becomes the desired enlargement ratio. The end of each of the first and second trackball TB operations is defined by pressing the aforementioned keys.

Since the processor PU has received the command WINDOW, it performs enlargement calculations on the image data and frame data read into the main memory MM using the enlargement ratio determined as described above, and displays the results of the calculations on the video. CRT via memory VM
Enlarge the display on the screen. FIG. 5 shows an example of an enlarged display of the logic circuit diagram shown in FIG. 1 in this manner. Since FIG. 5 displays coordinates that are not present in FIG. 2, the position of the enlarged image in the entire image can be known. During this enlarged display, the image data (main memory
MM) is referenced, and details such as component name, component number, logic symbol, terminal number, etc. are displayed on the corresponding component in the image.

Trackball in the embodiment shown in FIG.
Other pointing devices such as a mouse, joy stick, tablet, touch panel, etc. may be used instead of the TB, and a keyboard KB having a cursor movement function may be used instead of the pointing device.

Furthermore, instead of the floppy disk FD in the embodiment shown in FIG. 6, other storage means, such as a fixed magnetic disk device or a magnetic tape device, may be used.

Although the above explanation assumes the design of logic circuits used in information processing devices, the present invention can be broadly applied to software development or
This also applies to CAD/CAM images in general.

(Effects of the Invention) According to the present invention, by adopting the above configuration, the coordinates are displayed even in the enlarged image, so the position of the enlarged image in the entire image can be determined without impairing the enlargement ratio. can be seen at all times, making it possible to enlarge and display images with ease of use.

[Brief explanation of drawings]

Figure 1 is a general logic circuit diagram, Figures 2, 3 and 4 are diagrams for explaining the conventional system, and Figure 6 is a general logic circuit diagram.
The figure shows one embodiment of the present invention, and FIG. 5 shows a diagram for explaining the present embodiment. KB...Keyboard, TB...Trackball,
PU...processor, FD...floppy disk, MM...main memory, VM...video memory, CRT...cathode ray tube (CRT).

Claims (1)

[Scope of Claims] 1. In an image enlargement display device that enlarges an image displayed on a cathode ray tube screen based on image data, the image data and the coordinates of the image based on the image data on the cathode ray tube screen are displayed. image data storage means that stores in advance frame data for displaying the image and the coordinates; display instruction means for specifying the corresponding image data in order to display the image and the coordinates; and the specified image data. and an image data reading means for reading out frame data corresponding to the screen data from the image data storage means, and an enlargement instruction for instructing an enlarged area and enlargement rate on the cathode ray tube screen when the display is enlarged. means; image data calculating means for performing calculations on the read image data and frame data based on the enlargement ratio when the enlargement instruction is given; and based on the output of the image data reading means or the image data calculating means. An image enlargement display device comprising: image display means for displaying the image and the coordinates.