JPH0638181B2 - Map display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is combined with a color image display device for displaying a map image by a set of a plurality of display points capable of being color-coded, such as a color CRT to select a display form. The present invention relates to a map display control device adapted to display a map image.

(Prior Art) As disclosed in Japanese Patent Laid-Open No. 59-164583, map graphic data is separately recorded into earth coordinate information and point level information, and points to be displayed are discarded as necessary. Some are displayed while selecting.

(Problems to be Solved by the Invention) However, in the related art, for example, with respect to graphic data that is difficult to store as earth coordinate information such as lakes and rivers, the display of small lakes and rivers is selectively erased. It is difficult to change the display form. If this is to be realized, there is a problem that a complicated calculation is required every time the display form is changed, and further the contents of the image memory must be changed in order to change the display form.

The present invention has been made in view of the above problems, and an object of the present invention is to make it possible to easily change the display mode without changing the contents of the image memory.

(Means for Solving Problems) In order to achieve the above object, the present invention provides a color image display device for displaying a map image by color-coded display in units of display pixels according to a color signal, and a map storing map information. One of a plurality of pallet signals corresponding to each display pixel of the color image display device based on the map information read by the reading means and reading the map information from the information storage medium. An image memory for storing each of the above, a means for generating a selection signal for selecting a display form of a map to be displayed, and an individual display pixel provided between the image memory and the color image display device. Sequentially input palette signals corresponding to the above, convert each palette signal into a color signal corresponding to the selection signal, and apply the palette / color conversion to the color image display device. It is characterized by comprising a means.

(Operation and Effect) According to the above configuration, when the map display mode is selected, the palette signal stored in the image memory is converted into the color signal corresponding to the selection signal. The map display form can be easily performed only by converting the palette signal into a color signal according to the map display form without changing according to the display form.

(Example) Hereinafter, the present invention will be described based on illustrated examples. This embodiment is applicable to a system mounted on a vehicle and displaying a road map. In this embodiment, the possibility of displaying the road on the image or deleting it in the background is suggested depending on the size of the vehicle width of the "road" to be displayed. Do not explain the display.

The outline of the apparatus will be described with reference to FIG. 1. Reference numeral 1 in the figure is a selection device provided at a position operable by an occupant, preferably a driver, and operates a map by operating one or more switches. A selection signal for selecting the display form is generated. The graphic data reading device 2 reads graphic data of the map from a map information medium in the form of a cassette tape, a magnetic floppy disk, a semiconductor memory or the like.

The control device body 3 stores the graphic data read by the graphic data reading device 2 in a built-in memory, and causes the color CRT display device 4 to display a map image based on the stored graphic data. It is configured to provide a display drive signal. In the operation of the control device 3, the display form of the map image displayed on the color CRT display device 4 can be changed according to the selection signal generated by the selection device 1. The display form can be selected as, for example, an image with a fine display density or a rough image. At this time, for example, in the case of a river, the level of the size of the river to be displayed or erased is changed in accordance with the selection signal, For example, it is changed according to the vehicle width or the jurisdiction of road management.

FIG. 2 shows an example of a simplified image display for explanation, where a is the sea, b is a lake, c is a first-grade river, d is a second-grade river, and z.
Indicates land. In the map information medium to be read by the graphic data reading device 2, each of a large number of display points in units which can be designated by the control device 3 is a signal corresponding to the display section of a to z, that is, one of palette signals. The graphic data indicated by one is stored.

The palette signal is displayed by a 4-bit binary signal as follows, for example.

a (sea) = 1000B (B is a binary number) b (lake) = 1001B c (first-class river) = 1010B d (second-class river) = 1011B z (land) = 1111B As shown in FIG. The device 3 includes an input interface 31 for inputting signals from the selection device 1 and the graphic data reading device 2, and the selection signal and the graphic data are applied to the microcomputer 32 as a CPU via the input interface 31. It has become. The microcomputer 32 is connected to a program memory 33 including a ROM and a RAM, and operates according to a control program previously stored in the ROM.

The CRT controller 34 cooperates with the image memory 35 and the palette / color conversion circuit 36 to cooperate with the color CRT.
A display control signal is given to the display device 4. The graphic data (palette signal) input from the graphic data reading device 2 is input to the image memory 35 configured by the RAM via the CRT controller 34 and stored therein. Therefore, the image memory 35 has a storage capacity of 4 (bits) times the number of pixels (display points) of the map information displayed on the color CRT display device 4.

Under the control of the computer 32, the palette / color conversion circuit 36 is programmed with which color signal is converted for each palette signal based on the selection signal given from the selection device 1. Further, when a map is displayed after being programmed, when palette signals are sequentially given from the image memory 35 under the control of the CRT controller 34, the palette signals are converted into color signals as programmed. The color CRT display device 4 is provided. The color signal generally designates the densities of three colors of R (red), G (green), and B (blue), and together with the synchronizing signal given to the color CRT display device 4 by the CRT controller 35, the pixel ( A display control signal for driving and scanning a display point) at high speed is formed.

Details of the palette / color conversion circuit 36 are shown in FIG. The conversion circuit 36 includes a 4-bit 2-channel selection gate 361 (TC74HC241), a 6-bit gate 362 (TC74HC244), and a static RAM3.
63 (TC5517) and D / A conversion circuits 364, 3
It is composed of 65,366.

The static RAM 363 has a 4-bit addressing input A _{0 to} A ₃ and a 6-bit data input / output I / O _{1 to} I /.
With O ₆ . When programming the correspondence between the palette signal and the color signal, the selection gate 361 receives a 4-bit color map address signal equal to the palette signal in response to a command from the computer 32, and the static RAM 363.
6-bit color map data signal (color signal) given through the gate 362 in response to a command from the computer 32 at the same time is designated as the static RAM 363.
Is written to the specified address of. As a result, the static RAM 363 stores the color signal using the palette signal as an address.

When the color map data signal is read as a color signal from the static RAM 363 programmed in this way, the selection gate 361 gives the palette signal sequentially sent from the image memory 35 as an address input of the static RAM 363. The static RAM 363 outputs the color map data signal stored at the designated address to the D / A conversion circuits 364 to 366, and the color signals of three colors of R, G and B are given to the color CRT display device 4. .

The correspondence between the palette signal and the color map data signal is predetermined as shown in FIG. 4, for example.

If the display mode in which the sea, the lake, the first-grade river, and the second-grade river are all blue and only the land is displayed in white is selected by the selection device 1, the palette signal / color signal conversion is as follows. Programmed.

a (sea): 1000B → 100000B (blue) b (lake): 1001B → 100000B c (first-class river): 1010B → 100000B d (second-class river): 1011B → 100000B z (land): 1111B → 111111B (white) , If only the sea and lake are displayed in blue (see FIG. 5), the conversion is programmed as follows.

a (sea): 1000B → 100000B (blue) b (lake): 1001B → 100000B c (first-class river): 1010B → 100000B (white) d (second-class river): 1011B → 111111B z (land): 1111B → 111111B ( White) In the control device 3, the computer 32 supervises the operation of each of the above-described components according to a control program preset in the program memory 33. This control program is roughly composed of the following three steps (1) to (3).

(1) A selection signal for selecting a display form is input from the selection device 1 and stored in the RAM of the program memory 33. According to the stored selection signal, the palette / color conversion circuit 36
To program.

(2) Graphic data is input from the graphic data reading device 2 and transferred to the image memory as a palette signal.

Note that step (2) may be programmed to occur prior to step (1).

(3) The CRT controller 34 is used to sequentially apply the palette signal stored in the image memory 35 to the palette / color conversion circuit 36 to display the color CRT 4.

The correspondence between the above-described embodiment and the constituent elements described in the claims is as follows. The color CRT 4 corresponds to the color image display device, the graphic data reading device 2 corresponds to the reading means, and the selection device 1 and The microcomputer 32 corresponds to a means for generating a selection signal for selecting a map display form, and the palette / color conversion circuit 36 corresponds to a palette / color conversion means.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention, FIG. 2 is an explanatory diagram of a map display form, and FIG. 3 is a pallet in FIG.
FIG. 4 is a configuration diagram of a color conversion circuit, FIG. 4 is an explanatory diagram of palette / color conversion, and FIG. 5 is a diagram showing an example of a map display mode. 1 ... Selection device, 2 ... Graphic data reading device, 3 ... Control device, 4 ... Color CRT display device (color image display device), 31 ... Input interface, 32 ... Microcomputer, 34 ... CRT Controller, 35 ...
Image memory, 36 Palette / color conversion circuit.

Claims (1)

[Claims] 1. A color image display device for displaying a map image by color-coded display for each surface pixel unit according to a color signal, a reading means for reading the map information from a map information storage medium storing map information, and a reading means. An image memory for storing one of a plurality of palette signals corresponding to each display pixel of the color image display device based on the map information read in A means for generating a selection signal for selecting, a palette signal provided between the image memory and the color image display device, sequentially inputting a palette signal corresponding to each display pixel from the image memory, and selecting each palette signal A map display device, comprising: a palette / color conversion means for converting the color signal into a color signal corresponding to the signal and providing the color image display device with the palette / color conversion means.