JPH09127863A - Map data display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to display easily visible maps by subjecting the elements of color expressions of plural color codes to arithmetic processing by the set of fixed parameters to change the elements of the color expressions and displaying the maps in colors. SOLUTION: An RGB data forming section 18 forms the map images of colors to be displayed on a display section 19 by making the color codes in a V-RAM 17 and the RGB data supplied from a color pallet 16 correspondent to each other. At this time, the RGB forming section 18 executes such arithmetic processing as addition or subtraction by using the set of the fixed parameters and changes the images to have color tones, brightness and contrast desired by a user. A display 19 displayes in colors the images, i.e., maps based on the RGB data changed in the RGB data forming section 18. As a result, the user is able to change images displayed on a screen in the color tones, brightness and contrast meeting the ambient environment or according to the user's taste.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a map data display device for reading out map data recorded on a recording medium and displaying an image based on the map data on a display unit.

[0002]

2. Description of the Related Art In a display device, such as a navigation device, for reading out map data recorded in a recording medium and displaying a color image based on the map data on a display unit, an image based on the map data read out from the recording medium is displayed. Regarding the resolution of the display unit, the display color, the displayed character font, etc., there is a unified standard established by the Navigation Study Group.

For example, a display device having a resolution of about 320 pixels (horizontal direction) × 210 pixels (vertical direction) is used as the display unit. Specifically, about 6 inches of color monitor receiver, liquid crystal display device, Alternatively, a display device corresponding to them is used. The number of colors that can be displayed simultaneously by these display devices is determined to be 31 or more out of 4096 colors.

The characters displayed on the display are JIS
A font based on a 16-dot × 16-dot character font up to the second level is used. The character font is generated by hardware. The map data is recorded on the recording medium in a recording format based on this standard.

[0005]

When the map data recorded in the recording medium is displayed on the display unit as an image,
The display screen may be difficult to see depending on the location where the navigation device is used and the ambient brightness. In order to display images of roads, characters, etc. in an easy-to-see manner without being influenced by the surrounding environment in which the navigation device is used, it is necessary to change the brightness and contrast of the display screen according to the use environment. In order to obtain a display screen that is easier to see, it is necessary to change not only the brightness and contrast of the display screen but also the color tone of the displayed image.

However, in the small color monitor receiver as described above, although the brightness and contrast can be adjusted, the color tone cannot usually be adjusted. Therefore, the color designated by the map data read from the recording medium is displayed as it is.

By the way, the navigation device based on the standard of the above-mentioned navigation research group uses a so-called color palette, and the RGB three primary colors (hereinafter, simply referred to as RGB) from the color palette based on the color code of the map data read from the recording medium. Read the data of R
The method of displaying based on each data of GB is adopted. Here, when it is desired to change the display color, a method of directly changing the RGB data values to change the display color can be considered, but the work of designating the values is complicated for the user. Especially, when it is desired to change the display color in various ways, it becomes very complicated.

The present invention has been made in view of such a situation, and a part of the color tone in the display of the image based on the map data read from the recording medium can be easily changed to the color tone desired by the user. It is an object of the present invention to provide a map data display device capable of displaying an easy-to-see map.

[0009]

A map data display device according to the present invention reads out map data having a plurality of color codes recorded on a recording medium and outputs a plurality of colors included in the map data reproduced from the recording medium. A set of fixed parameters for making changes to the elements of color expression corresponding to the code is provided, and the elements of color expression of multiple color codes are subjected to arithmetic processing by the set of fixed parameters to change the elements of color expression To display the map in color.

Here, the color expression element is, for example, R
It is a level of GB. Then, using a set of fixed parameters, arithmetic processing is performed on the RGB levels, and the color expression is changed by changing the values.

In particular, a part of the plurality of color codes is changed by a fixed parameter to emphasize only a specific color.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a map data display device according to the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a map data display device to which the present invention is applied.

This map data display device has a key operation section 11 for a user to perform a key operation, a CD-ROM drive circuit 12 for driving a CD-ROM 10, and a plurality of color codes recorded in the CD-ROM 10. A data reproducing section 13 for reproducing the map data, a RAM 14 for temporarily storing the reproduced map data, and a C for controlling the CD-ROM drive section 12 and the like in response to a signal from the key operation section 11.
CP based on PU15 and color code of map data
An element of color expression, that is, RG, under the control of U15
A color palette 16 for outputting each data of B3 primary colors (hereinafter, referred to as RGB), and a V for temporarily storing image data.
-RAM 17 and R using fixed parameters described later
An RGB data creating unit 18 for performing an operation for modifying the GB data, a display 19 for displaying a color image,
Globaling Positioning System (hereinafter GPS
That. ) A GPS receiver 20 for receiving signals from the satellite group.

In this embodiment, the map data is recorded in the CD-ROM 10 as, for example, a 4-bit color code for specifying the color of each pixel, not each value of RGB, in order to reduce the amount of color data. ing.

Next, the operation of this map data display device will be described.

As shown in FIG. 1 described above, the key operation unit 11 is composed of a key panel 11a and a key input circuit 11b. When the user operates the key panel 11a, a signal corresponding to the operation is sent from the key panel 11a. Input circuit 1
1b, the key input circuit 11b generates a key signal. Then, the CPU 15 responds to the key signal with C
The D-ROM drive circuit 12 is controlled, and the CD-ROM drive circuit 12 drives the CD-ROM 10. In particular,
For example, when the user performs an operation of displaying a map of a desired city, the CPU 15 controls the pickup 13a to access the area of the CD-ROM 10 in which the map data of the city is recorded. And pickup 1
3a supplies a reproduction signal to the signal processing circuit 13b. The signal processing circuit 13b, for example, binarizes the reproduction signal, reproduces the map data, and supplies the map data to the RAM 14. RAM14
Stores the map data from the signal processing circuit 13b.

The CPU 15 selects the map data corresponding to the area of the image to be displayed on the display 19 from the map data stored in the RAM 14 according to the key signal from the key input circuit 11b, and selects the color of the selected map data. The color code for instructing is supplied to the color palette 16.

The CPU 15 also includes a GPS receiver 20.
The color pallet 16 has a color code for displaying the position information indicating the current position, which is measured by, so that the position information is reflected in the displayed image, that is, for example, displaying the current position and the locus to the current position. Supply to.

The color palette 16 includes color expression elements corresponding to a plurality of color codes included in the map data.
That is, RGB data is stored in advance. Specifically, for example, 16 arbitrarily selected from 4096 colors
RGB data regarding colors is stored in correspondence with color codes such as # 0 to # 15. Then, the color palette 16 reads out RGB data for each pixel in accordance with a color code supplied from the CPU 15 and outputs RGB data.
It is supplied to the data creation unit 18. The user can select a desired color combination and register the RGB data of those colors in the color palette 16.

The V-RAM 17 temporarily stores the image and color code of the map data sent via the CPU 15 for each pixel, and further stores the image data in the RGB data creating section 18.
To supply.

The RGB data creating section 18 is a V-RAM 1
Color code in 7 and R supplied from the color palette
A color map image displayed on the display unit 19 is created in association with the GB data. Further, at this time, the RGB creating unit 18 performs arithmetic processing such as addition or subtraction using a set of fixed parameters, as described later, to change the image to the tone, brightness and contrast desired by the user.
The display 19 displays an image based on the RGB data changed by the RGB data creation unit 18, that is, a map in color.

Now, the color palette 16 will be described in detail.

The map data recorded on the CD-ROM 10 includes, for example, a 4-bit color code for specifying one of 16 colors on the color palette 16 for each pixel. The data stored in the color palette 16 corresponding to this color code is R (red) in that color,
It is composed of data defining each level of G (green) and B (blue) in 16 stages of 0 to 15, that is, data of 4 bits × 3.

In such a color display with a combination of RGB levels, when R, G and B are both 15 (F in hexadecimal notation), "white" is shown, and R, G and B are both 0. In this case, “black” is displayed, and it is possible to express 16 ³ colors, that is, 4096 colors, by combining the levels of RGB.

Further, this map data display device is an element of color expression corresponding to each color code.
For example, the RGB data creation unit 18 is provided with a plurality of sets of fixed parameters for changing the GB data. Then, the CPU 15 causes the key input circuit 11b to be described later.
Based on the key signal from, one of a plurality of fixed parameter sets is selected, and the RGB data creation unit 18 performs a process such as addition or subtraction using the selected fixed parameter. Thus, the color tone, brightness and contrast of the image are changed based on the map data.

A more specific example of arithmetic processing will be described with reference to Table 1.

[0028]

[Table 1]

The key panel 11a provided in the map data display device has, for example, color tones such as "cool", "warm", "dark", "bright", "mild" and "sharp", brightness and contrast. Keys representing images are provided, and each key corresponds to a fixed parameter used for changing RGB data. That is, when the user selects one of the keys representing an image, the calculation using the corresponding fixed parameter is performed on the RGB data that is an element of color expression, and the color tone of the display screen is changed.

For each key representing the image of the color tone, brightness and contrast described above, "cool" is blue (B),
“Warm” indicates a fixed parameter such that red (R) is emphasized and “green” emphasizes green (G).
In addition, changing the brightness lowers or raises the RGB levels at the same time. Specifying "mild" makes the entire screen a little darker, and specifying "dark" makes the screen darker and "bright". The screen becomes brighter when specified. On the other hand, if you select the "Sharp" key, RG will
The calculation for increasing the level difference of B data is performed, and the contrast of the screen is increased.

In this map data display device, RGB data, which is an element of color expression, takes each level of RGB as 16 levels of values from 0 to 15 as described above, and when addition or subtraction processing is performed on each data. In addition, the calculation result is set to fall within the range of 0 or more and 15 or less. Also, RG
The calculation is performed in consideration of the total of the respective values of B data.

For example, in the "cool", "warm", and "green" arithmetic processes shown in Table 1, 4 is added to the value indicating the level of one color to be emphasized in the RGB data, and the other two colors. Only 2 is subtracted from the value indicating the level. Thus, by adding x to the value indicating the level of one color to be emphasized and subtracting x / 2 from the value indicating the levels of the other two colors, it is possible to prevent the total level of the three RGB colors from changing. That is, only the color tone can be changed without significantly changing the brightness.

Further, in this map data display device, in the "dark", "mild" and "bright" modes in which the brightness of the display is changed, the upper and lower limit values are added to the calculation results for the respective RGB level values. I am trying to set it. If this setting is not made, for example, if "Bright" is selected, the RGB level may exceed the maximum value of 15 due to the addition processing, and the whole or part of the screen displaying the map becomes white, so-called "image". There is a possibility that it will be in a state called "Gatobu". Also, selecting “Dark” may make the screen too dark, making the information unreadable.

Therefore, in this map data display device,
In "bright", if the upper limit level is set to 14, for example, if the result of the arithmetic processing for changing a certain level is larger than 14, the processing for suppressing the value to 14, that is, the arithmetic result is 14 Value y is added. If you do this for one of the RGB levels,
Y is also added to values indicating other levels to prevent a change in the color tone of RGB data, which is an element of color expression.

On the other hand, in the case of "dark", the lower limit level is set to 2, for example, and when the result of the arithmetic processing for changing a certain level is smaller than 2, the value is suppressed to 2, that is, the result of the arithmetic operation. The value z is subtracted so that becomes 2. When this processing is performed on one of the values indicating the RGB levels, z is also subtracted from the values indicating the other levels, and the change in the overall color tone is prevented.

In the case of "sharp" for changing the contrast of an image, as shown in Table 1, it is first judged whether the value indicating each RGB level is 8 or more or 7 or less, and the level value is 8 or less. If it is above, 1 is added to the level value, and if the level value is 7 or less, 1 is subtracted from the level value.

As described above, in the map data display device for displaying the map image in color, one set or a plurality of sets of fixed RGB data, which is an element of the color expression designated by the color code on the color palette, is fixed. By supplying the value of the result calculated by using the parameter to the display 19, it is possible to easily change the color tone, the brightness and the contrast according to the surrounding environment and the preference of the user.

If a plurality of sets of parameters are provided as described above, one set of fixed parameters is selected therefrom, and selection of a fixed parameter indicating a desired change to a predetermined color palette is registered by default, the type It is possible to display a map in a desired color image using the registered settings without newly setting the software of different CD-ROMs.

Further, the roads are emphasized by changing the color tone or the like by using the above-mentioned fixed parameters only for a part of the plurality of color codes, for example, the color code of the color indicating the road. It can also be displayed on the display 19.

The RGB data is changed by the RGB data creating section 18 in this embodiment, but the color palette 16 can also be changed by similar processing.

[0041]

The map data display device of the present invention is a map data display device for reading out map data having a plurality of color codes recorded on a recording medium and displaying the map data in color. The element of the color expression to be displayed corresponding to the color code is calculated using a set of fixed parameters, and the image is displayed using the changed element of the color expression. This allows the user to match the image displayed on the screen with the surrounding environment or change the color tone, brightness, and contrast according to the user's preference. For example, the brightness of the screen can be changed between day and night to make the screen easier to see, or the road can be emphasized and displayed by emphasizing the color indicating the road.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a map data display device to which the present invention is applied.

[Explanation of symbols]

10 CD-ROM, 11 key operation part, 12 CD-
ROM drive circuit, 13 data reproducing section, 14 RAM, 1
5 CPU, 16 color palette, 17V-RAM,
18 RGB data creation unit, 19 display

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI Technical indication location G09G 5/36 510 9377-5H G09G 5/36 520A 520 G06F 15/62 335 (72) Inventor Nakano Kinichiro 6-735 Kitashinagawa, Shinagawa-ku, Tokyo Sony Corporation

Claims (1)

[Claims] 1. A map data display device for reading out map data having a plurality of color codes recorded on a recording medium and displaying a map in color according to the color codes, the map data being reproduced from the recording medium. A set of fixed parameters for making changes to the elements of the color expression corresponding to the plurality of color codes are provided, and the above-mentioned fixed to the elements of the color expression corresponding to a part of the plurality of color codes. A map data display device characterized in that it performs arithmetic processing using parameters to change and display elements of color expression.