JP2856168B2 - Map data display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a map data display device for reading 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 for reading out map data recorded on a recording medium and displaying a color image based on the map data on a display unit, for example, in a navigation device, an image based on the map data read from the recording medium is displayed. Regarding the resolution of the display unit, the display color, the character font to be displayed, and the like, a uniform standard is set by the Navigation Research Group.

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

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

[0005]

When map data recorded on a recording medium is displayed on a 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 surrounding brightness. In order to display images such as roads and characters in an easy-to-view manner without being affected by the surrounding environment where the navigation device is used, it is necessary to change the brightness and contrast of the display screen in accordance with the use environment. In order to obtain a more easily viewable display screen, it is necessary not only to adjust the brightness and contrast of the display screen but also to change the color tone of the displayed image.

However, in such a small color monitor receiver as described above, the brightness and contrast can be adjusted, but the color tone cannot usually be adjusted. For this reason, the color specified by the map data read from the recording medium is displayed as it is.

By the way, a navigation device based on the standards of the above-mentioned navigation study group uses a so-called color palette and uses three primary colors of RGB (hereinafter simply referred to as RGB) from a color palette based on a color code of map data read from a recording medium. Read out the data of R
A method of performing display based on each data of GB is adopted. Here, when it is desired to change the display color, a method of directly changing the values of the RGB data to change the display color can be considered, but the operation of specifying the value is complicated for the user. In particular, when it is desired to change the display color in many ways, it becomes very complicated.

The present invention has been made in view of such circumstances, and simply changes a part of the color tone in displaying an image based on map data read from a recording medium to a color tone desired by a user. It is an object of the present invention to provide a map data display device which makes it possible to display an easy-to-view map.

[0009]

A map data display apparatus according to the present invention reads map data having a plurality of color codes recorded on a recording medium, and reads a plurality of colors included in the map data reproduced from the recording medium. A set of fixed parameters for making changes to the parameters of the color expression corresponding to the code is provided. Display in color.

Here, the element of color expression is, for example, R
This is the GB level. 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.

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

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment 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 a 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 operate a key, a CD-ROM drive circuit 12 for driving a CD-ROM 10, and a plurality of color codes recorded on the CD-ROM 10. A data reproducing unit 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 unit 12 and the like according to a signal from the key operation unit 11
PU15 and CP based on the color code of the map data
Under the control of U15, the element of color expression, that is, RG
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.
R using the RAM 17 and fixed parameters to be described later.
An RGB data creating unit 18 for performing an operation of changing the GB data, a display 19 for displaying a color image,
Global Positioning System (GPS)
That. A) a GPS receiver 20 for receiving signals from a group of satellites.

In this embodiment, the map data is recorded on the CD-ROM 10 as, for example, a 4-bit color code for specifying the color, instead of the RGB values, for each pixel color in order to reduce the data amount relating to the color. ing.

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

As shown in FIG. 1, the key operation section 11 includes a key panel 11a and a key input circuit 11b. When a user operates the key panel 11a, a signal corresponding to the operation is transmitted from the key panel 11a to the key panel 11a. Input circuit 1
1b, and the key input circuit 11b generates a key signal. Then, the CPU 15 responds to this key signal by
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 so as to access an area of the CD-ROM 10 in which map data of the city is recorded. And pickup 1
3a supplies a reproduction signal to the signal processing circuit 13b. For example, the signal processing circuit 13 b 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 map data corresponding to an area of an image to be displayed on the display 19 from the map data stored in the RAM 14 according to a key signal from the key input circuit 11b, and selects a color of the selected map data. Is supplied to the color palette 16.

The CPU 15 has a GPS receiver 20
The color information for displaying the current position, which indicates the current position, is displayed in the color palette 16 so that the position information is reflected in the displayed image, that is, for example, the current position and the trajectory to the current position are displayed. To supply.

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 colors arbitrarily selected from 4096 colors are selected.
RGB data related to the color is stored corresponding to a color code such as # 0 to # 15. The color palette 16 reads RGB data for each pixel in accordance with the color code supplied from the CPU 15 and
The data is supplied to the data generator 18. The user can select desired color combinations 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 an RGB data creation unit 18.
To supply.

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

Here, 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) for that color,
It is composed of data defining each level of G (green) and B (blue) in 16 levels from 0 to 15, that is, data of 4 bits × 3.

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

The map data display device has a color representation element R corresponding to each color code.
A plurality of sets of fixed parameters for changing the GB data are provided in, for example, the RGB data creating unit 18. Then, the CPU 15 controls the key input circuit 11b as described later.
, One of a plurality of sets of fixed parameters is selected based on the key signal, and the RGB data creating unit 18 performs processing such as addition or subtraction using the selected fixed parameters. Thus, the color tone, brightness and contrast of the image are changed based on the map data.

An example of a more specific calculation process 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, brightness, and contrast such as "cool", "warm", "dark", "bright", "mild", and "sharp". Keys representing images are provided, and each key corresponds to a fixed parameter used for changing RGB data. In other words, when the user selects one of the keys representing the image, an operation using the corresponding fixed parameter is performed on the RGB data, which is an element of the color expression, and the color tone of the display screen is changed.

The keys representing the color, brightness, and contrast images described above are “cool” for blue (B),
"Warm" indicates a fixed parameter such that red (R) is emphasized, and "green" indicates green (G).
In addition, the change in brightness is to lower or increase the level of each of RGB at the same time. When "mild" is specified, the entire screen becomes slightly darker, when "dark" is specified, the screen becomes further darker, and "bright" is changed. When specified, the screen becomes brighter. On the other hand, if you select the “Sharp” key, RG
An operation for increasing the level difference of the B data is performed, and the contrast of the screen is increased.

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

For example, in the "cool", "warm" and "green" arithmetic processing shown in Table 1, of the RGB data, 4 is added to the value indicating the level of one color to be emphasized, and the other two colors are added. For the value indicating the level, the subtraction process is performed by two. 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 level 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 greatly changing the brightness.

Also, in this map data display device, in the "dark", "mild" and "bright" modes for changing the brightness of the display, the upper and lower limit values are added to the calculation results for the values indicating the levels of RGB. I am trying to set it. If this setting is not made, for example, when “Bright” is selected, the level of each of RGB may exceed the maximum value 15 due to the addition processing, and the whole or part of the screen displaying the map becomes white, that is, the so-called “image” There is a possibility that it will be in a state called "jump." In addition, there is a possibility that the screen becomes too dark due to the selection of “dark”, and the information becomes unreadable.

Therefore, in this map data display device,
In the case of "Bright", when the upper limit level is set to, for example, 14, when 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 operation result is set to 14. Is added. If you do this for one of the RGB levels,
The y is also added to the values indicating the other levels to prevent a change in the color tone of the RGB data which is an element of the color expression.

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

In the case of "sharp" in which the contrast of the image is changed, as shown in Table 1, it is first determined whether the value indicating each level of RGB is 8 or more or 7 or less. If so, 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 a map data display device for displaying a map image in color, one or a plurality of fixed sets of RGB data, which are elements of a color expression designated by a color code on a color palette, are used. By supplying the value of the result calculated using the parameters to the display 19, the color tone, brightness, and contrast can be easily changed according to the surrounding environment and the user's preference.

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

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

Although the RGB data is changed by the RGB data creating section 18 in this embodiment, the same processing can be applied to the color palette 16 as well.

[0041]

The map data display device of the present invention reads out map data having a plurality of color codes recorded on a recording medium and displays the map data in color. An arithmetic process is performed on a parameter of a color expression corresponding to a color code using a set of fixed parameters, and an image is displayed based on the changed parameter of the color expression. Thus, the user can change the color tone, brightness and contrast according to the surrounding environment of the image displayed on the screen or according to the user's preference. For example, changing the screen brightness between day and night makes the screen easier to see,
Alternatively, by highlighting the color indicating the road, the road can be emphasized and displayed.

[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 unit, 12 CD-
ROM drive circuit, 13 data reproducing unit, 14 RAM, 1
5 CPU, 16 color palette, 17V-RAM,
18 RGB data creation unit, 19 display

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kinichiro Nakano 6-7-35 Kita-Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation (56) References JP 5-19686 (JP, A) JP Hei 4-321098 (JP, A) JP-A-62-62386 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) G09B 29/10 G01C 21/00 G06T 1/00 G08G 1 / 0969

Claims (1)

(57) [Claims] 1. A map data display device for reading map data having a plurality of color codes recorded on a recording medium and displaying a map in color according to the color code, wherein the map data is included in the map data reproduced from the recording medium. a plurality of pairs of fixed parameters for applying changes to parameters of color representation corresponding to the color code provided that, mosquito corresponding to a portion of the color codes of said color code
Performing an operation processing to the parameters of color expressed by using the fixed parameter, a map data display device and displaying by changing the parameters of color representation.