JPH0463391A - Image map display device - Google Patents

Abstract

PURPOSE:To display a distinct image map by storing plural kinds of map image information difference in scale and selecting map image information whose scale most approximates a designated display scale and performing the enlargement/reduction processing. CONSTITUTION:A display region and a display scale of the image map to be display-outputted are inputted from an indication input part 1. Map image information whose scale most approximates the display scale designated by the input part 1 is selected from plural kinds of map image information stored in a map image information storage part 4 by a selective extraction processing part 3. Display image information extracted by the processing part 3 is enlarged or reduced to the designated display scale by an enlargement/reduction processing part 2. Finally, display image information enlarged or reduced by the processing part 2 is transferred to a display output part 5 and is displayed as an image map on a screen.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image map display device, and more particularly to an image map display device that displays an image map at a specified display scale on a display screen.

[Conventional technology]

The conventional image map display device, as shown in Fig. 3,
An instruction input unit 1 for instructing the display area and display scale of an image map to be displayed (the map displayed on the screen is called an image map), and a map image information storage unit storing map image information of a single scale. 4a, and a map image information storage unit 4 based on the designated display area and display scale.
an extraction processing section 3a that extracts information on a corresponding part of a as display image information; an enlargement/reduction processing section 2 that performs an enlargement or reduction process on the extracted display image information so that it becomes a specified display scale; The display output unit 5 displays the processed display image information on the screen as an image map.

[Problem to be solved by the invention]

In the above-described conventional image map display device, the map image information to be processed has a single scale, so there is a drawback that the range of display scales that can be specified is limited. In other words, when trying to display an image map with a wide display scale range, it is unavoidable that the magnification of enlargement or reduction becomes large, and if the magnification of magnification is large, the pixels will only be enlarged to the stars, but the details will not be visible. It becomes impossible to grasp the image, and if the reduction ratio is large, there are drawbacks such as characters and map symbols becoming indistinguishable.

An object of the present invention is to provide an image map display device that can display a clear image map over a wide display scale range.

[Means to solve the problem]

The image map display device of the present invention includes an input means for instructing the display area and display scale of the image map displayed on the screen, a storage means storing a plurality of types of map image information of different scales, and the input means. a selection extraction means for selecting map image information including a designated display area and having a scale close to the designated display scale from the storage means and extracting a corresponding portion as display image information; Composed of: an enlargement/reduction means for enlarging or reducing the display image information to the display scale; and a display output means for displaying the display image information processed by the enlargement/reduction processing means on a screen as an image map. has been done.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

The image map display device shown in FIG. 1 is similar to the conventional image map display device shown in FIG. It is composed of an information storage section 4 and a display output section 5.

Instruction input section 1. The enlargement/reduction processing unit 21 display output unit 5
Although it is the same as that of the conventional device shown in the figure, the map image information storage unit 4 stores map image information of a plurality of scales, and the selection extraction processing unit 3 stores the display area specified by the instruction input unit 1. , the map image information of the scale closest to the designated display scale is selected, and the information of the corresponding part therein is extracted as the display image information.

FIG. 2 is a flowchart explaining the operation of FIG. 1. First, the display area and display scale of the image map to be displayed and output are input in the instruction input unit 1 (step S
L＞. Next, the selection extraction processing section 3 selects map image information of a scale closest to the display scale specified in the instruction input section 1 from among the plurality of types of map image information stored in the map image information storage section 4. Select (step S2). Next, the selection extraction processing unit 3 extracts information corresponding to the display portion of the selected map image information as display image information based on the display area and display scale specified by the instruction input unit 1 (step S3 ). The display image information extracted by the selection extraction processing section 3 is enlarged or reduced to the display scale specified by the enlargement/reduction processing section 2 (
Step S4). Finally, the display image information that has been enlarged or reduced by the enlargement/reduction processing section 2 is passed to the display output section 5 and displayed on the screen along with the image map (Step S5).

In the above explanation, it was stated that map image information with a scale closest to the displayed scale is selected from among multiple map image information, but the relationship between magnification and image quality can be seen in the case of reduction and enlargement. Therefore, when the display scale is between the scales of the two map image information, either enlargement or reduction may be given priority.

〔Effect of the invention〕

As described above in detail, the present invention stores a plurality of types of map image information of different scales in a map image information storage unit, selects map image information of a scale close to a specified display scale, and performs scaling processing. and display it on the screen,
A clear image map can be displayed for a wide range of specified display scales, and it has the effect of allowing detailed parts to be grasped and characters and map symbols to be distinguished.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, FIG. 2 is a flowchart showing the operation of FIG. 1, and FIG. 3 is a block diagram showing the configuration of an example of a conventional image map display device. . 1...Instruction input section, 2...Enlargement/reduction processing section, 3...Selection extraction processing section, 3a...
- Extraction processing unit, 4°4a...Map image information storage unit, 5...Display output unit.

Claims (1)

[Claims] an input means for instructing a display area and display scale of an image map to be displayed on the screen; a storage means for storing a plurality of types of map image information of different scales; selection and extraction means for selecting map image information at a scale close to the display scale selected from the storage means and extracting a corresponding portion as display image information; What is claimed is: 1. An image map display device comprising: an enlargement/reduction means for performing enlargement or reduction processing as described above; and a display output means for displaying display image information processed by the enlargement/reduction processing means on a screen as an image map.