JPH02267583A - Image display device - Google Patents

Abstract

PURPOSE:To display a picture with much presence when a car is driven by deforming a map information viewed from just above and stored in a map information storage means into a trapezoid. CONSTITUTION:The map information is stored in the map information storage means 1 and sent to an image plotting means 2 via a data bus 9. The plotting means 2 plotts the map information and writes it in an original image storage means 3. The map information which is stored in the original general image storage means 3 is the map viewed from just above. This information is deformed into the trapezoid by an image deformation means 4. That is, the map information is deformed so that the map on this side is large and the map on the far side is small. The information deformed in the trapezoid is stored in a display date storage means 5. This stored information is sent to a CRT 6 and a picture is displayed with much presence.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an image display device for a navigation system installed in an automobile.

BACKGROUND ART FIG. 6 shows a conventional image display device. The map information storage means 61 stores map information. This information can be something like "Draw a straight line from which point to which point on the display device."
Information such as "Which point should the center be used to draw a circle" is stored.

A map is drawn using such information. Character information for explaining the location of this map is also stored.

Reference numeral 62 represents an image drawing means for drawing an actual image from such straight line and circle information. e3 is display image storage means for storing image information drawn by the image drawing means 62. 64 is a display means (CRT) for displaying the image information stored in the display image storage means 63. 66 is a processor that performs these controls, and a control bus 6
It is connected to each means by e. Further, image data flows between each means through a data bus 67.

Problems to be Solved by the Invention However, in the image display device as shown in FIG.
The image information displayed on the RT64 is the map viewed from directly above. When a car is actually moving, it is not possible to display images with a sense of realism, such as things in the foreground being large and things in the distance being small.

The present invention makes it possible to display images with a more realistic feeling when a car is running. That is, it is possible to display objects in the nearer side larger and objects farther away smaller.

Means for Solving the Problems In order to solve the above problems, the present invention provides map information storage means for storing map information, image drawing means for drawing the map information stored in the storage means, and image drawing means for drawing the map information stored in the storage means. a first image storage means for storing image information drawn by the means; an image transformation means for transforming the image stored in the first image storage means; and a storage for storing image information transformed by the image transformation means. and an image display means for displaying the image information stored in the 20th image storage means.

Effects The present invention, with the above configuration, transforms and displays the map information stored in the map information storage means as a realistic image, and the image drawing means draws the map information stored in the map information storage means based on the map information stored in the map information storage means. It is stored as an image in the first image storage means. At this time, the image information stored in the first image storage means is the map viewed from directly above. The image transformation means is
The image information stored in the tenth image storage means is transformed so that the image in the near side becomes larger and the image in the distance becomes smaller.

That is, trapezoidal deformation is performed. The image information transformed into a trapezoid is stored in the second image storage means and displayed on the image display means. Images displayed in this way have a sense of realism.

Embodiment FIG. 1 is a block diagram of an image display device according to an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes map information storage means that stores map information. Reference numeral 2 denotes an image drawing means for drawing a map based on the map information stored in the map information storage means 1. 3 is an original image storage means for storing map information drawn by the image drawing means 2; 4
is an image transformation means that transforms the image information stored in the original image storage means 3. Reference numeral 6 denotes display data storage means for storing image information transformed by the image transformation means 4. 6 is a CRT for displaying map information stored in display data storage means 6; 7 is a processor that controls each block configuration via a control bus 8, and 9 is a data bus that controls data exchange between each block configuration.

In the above configuration, the map information storage means 1 stores map information. Map information is data that is the basis for displaying a map. This information stores information such as ``Draw a straight line from one coordinate to another coordinate'' or ``Draw a circle with a radius centered on a certain point.'' This map information is sent to the image drawing means 2 via the data bus 9.

The image drawing means 2 draws this map information and writes it into the original image storage means 3. The map information stored in the original image storage means 3 is a map viewed from directly above.

This information is transformed into a trapezoid by the image transformation means 4 and sent to the display data storage means 6. The map information stored in the display data storage means 6 is sent to the CRT 6 and displayed as a realistic image.

FIG. 2 is a block diagram illustrating details of the image transformation means 4, which is the main part of FIG. 1. In FIG. 2, reference numeral 3 represents an original image storage means for storing an original image. The image transformation means 4 includes an image position instruction means 24, a comparison means 26, a transformation butter/storage means 26, a transformation pattern generation means 27,
There is an input buffer 28 and an output buffer 29. The image transformed by the image transformation means 4 is stored in the display data storage means 6.
is memorized.

The image stored in the original image storage means 3 is the map viewed from directly above. One line of the original image storage means 3 is transformed by the image transformation means 4, and the display data storage means 6
is stored in one line.

This corresponding one line is designated by the image position designating means 24. The deformation pattern generating means 27 generates a pattern for deforming each line.

This pattern is stored in the modified pattern storage means 26. One line of image information stored in the original image storage means designated by the image position storage means 24 is input to the input buffer 28 . The image information in the input buffer 28 is compared with the deformed pattern 26 by the comparison means 26. The compared and reduced image information is sent to the output buffer 2
9 is output. The image information in the output buffer 29 is stored in one line of the display image storage means 6 designated by the image position storage means 24.

FIG. 3 shows the map information displayed on 0RT6.

As shown in FIG. 3(A), map information is normally displayed as seen from directly above (contents of the original image storage means 3).

- Figure 3 of the force cylinder (as shown in the illustration, the sense of realism can be increased by displaying the image in a smaller size as it moves farther away (contents of CRT6)).

FIG. 4 shows an image deformation method for this purpose. That is, the operation of the configuration shown in FIG. 2 will be explained in further detail. The image position storage means 24 stores the original image 41
and the position of one line of image information of the display image 42 are stored. One line of the original image 41 is transformed and transferred to a corresponding line of the display image. One line of the original image is
It is input into the input buffer 28 of the image transformation means 4. The input buffer 28 receives the modified pattern 2 by the comparing means 26.
6a pixel by pixel. The deformed pattern 26a is
It is made up of 0 and 1. The pixels in the input buffer 28 that match this 1 are output to the output buffer 29. Furthermore, pixels that match 0 are not output. In this way, the input image is reduced. The contents of the output buffer 29 are written to the location of the display image 42 pointed to by the image position 1 storage means 24. In this manner, after the processing of one line is completed, the image position storage means 24 indicates the next line of the original image 41 and the display image @42. In addition, the deformed pattern 26
a is also rewritten and the next line is processed.

FIG. 6 shows how to create a deformed pattern.

When reducing the size to 174, draw a straight line with a slope of 1/3. Each time a straight line crosses a vertical grid line, it generates a pattern of "0" or "1". If the straight line does not cross a horizontal grid line before crossing the next vertical grid line, a "0" pattern is generated. If it crosses the horizontal grid line, a pattern of "1" is generated. For a straight line with a slope of 173, the straight line crosses a horizontal grid line once every three times it crosses a vertical grid line.

As a result, a pattern containing "1" once every three times is generated. In this way, a pattern is created that reduces the image to 1/3. To change the reduction ratio, just change the slope of this straight line.

When transforming a map into a trapezoid, you can gradually reduce the slope of this straight line.

Effects of the Invention As described above, the present invention makes it possible to display an image with a more realistic feeling by using an image transformation means to make objects in the near side larger and objects in the distance smaller when the car is moving. can.

[Brief explanation of drawings]

Fig. 1 is a block wiring diagram of an image display device according to an embodiment of the present invention, Figs. 2 and 4 are block wiring diagrams of an image transformation means which is the main part of Fig. 1, and Fig. 3 is a block wiring diagram of an image transformation means. FIG. 6 is an explanatory diagram showing a method of transforming an image by the same means, and FIG. 6 is a block diagram of a conventional image display device. 1... Map information storage means, 2... Image drawing means, 3
... Original image storage means, 4... Image transformation means, 6...
-Display data storage means, 6...CRT, 7...Bromo, 8...Control bus, 9...Data bus. Name of agent Patent attorney Shigetaka Awano Idiot 1 Figure Figure (a) (υ) Figure

Claims (1)

[Claims] A map information storage means for storing map information, an image drawing means for drawing the map information stored in the map information storage means, and a first image storage for storing the image information drawn by the image drawing means. means, an image transformation means for transforming the image stored in the first image storage means, a second image storage means for storing image information transformed by the image transformation means, and a second image storage means for storing the image information transformed by the image transformation means; An image display device comprising an image display means for displaying image information stored in an image storage means.