JPH09218642A - Map display method and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a superimposed display of an image map and a vector map with the display colors of both maps exploited as it is. SOLUTION: An image map and a vector map are different electronic maps from each other and usually, both maps are separately retrieved and separately displayed. However, there is a request for a superimposed display to display an image map on the lower side and a vector map on the upper side respectively. Therefore, a vector map and an image map retrieved and taken from an external storage device (database) 4 on the area are processed with an arithmetic processor 2 to superimpose them to be displayed on the display part 3. Here, if the image map is reduced in the display intensity and picture elements of the image map and those of the vector map are overlapped, the picture elements of the vector map is preferentially displayed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a map display method and apparatus suitable for superimposing an image map and a vector map.

[0002]

2. Description of the Related Art Electronic maps include image maps and vector maps. An image map is an electronic map in a data format that can be obtained by raster scanning from a paper map, and a vector map is an electronic map that constitutes a map with vectors such as straight lines and circles. Such an electronic map is stored in a map database, and the user reads out an image map or a vector map from the map, performs appropriate processing, and displays it for observation. There are various types of maps, including regional maps such as Japan maps, maps by prefectures, maps by municipalities, facility maps, and maps such as water and gas piping maps. In addition, there are various maps with a scale of one hundredth to one millionth.

[0003]

There is a demand for superimposing and displaying an image map and a vector map. For example, there is a request to display the transmission system of the electric power system in the map by prefecture or to highlight the location of the public facility in the map by municipality. In such cases, prefecture maps and municipal maps are created as image maps, and the locations of power transmission systems and public facilities are often created as vector maps. Is required. In the case of overlapping display, a simple method is to display the both as they are. In the overlapped pixel, the image pixel and the vector pixel are mechanically overlapped as they are. However, for example, in color display of both, the overlapped pixel may become difficult.

An object of the present invention is to provide a map display method and apparatus which can display an image map and a vector map in such a manner that they can be clearly visually separated in a superimposed display.

A further object of the present invention is to display a vector map on the upper side, display an image map on the lower side, and display the vector map itself in the original color components of the vector map. Is provided.

[0006]

According to the present invention, the display brightness of at least one of the vector map and the image map is changed to a value smaller than the reference display brightness at the time of single display. A map display method in which both maps are displayed in a superimposed manner including the changed display brightness is disclosed.

Further, according to the present invention, the display brightness of the image map having the reference display brightness is changed to a value smaller than the reference display brightness at the time of superimposing display, and the image map after the change is set to the lower side,
A map display method in which a vector map is superimposed and displayed on the upper side is disclosed.

Further, according to the present invention, the display brightness of the image map composed of the reference display brightness and the first reference display color is changed to a value smaller than the reference display brightness in the superimposed display, and the image map after the change is changed. Will be displayed on the lower side, and a vector map composed of the second reference display color will be displayed on the upper side.

Further, according to the present invention, a storage unit for storing an image map composed of a reference display brightness and a first reference display color and a vector map composed of a second reference display color,
A means for changing the display brightness of the image map to a small value at the time of superimposition display, a processing unit that retrieves the image map and the vector map from the above storage unit, performs processing such as enlargement and reduction, and the processed image map and vector. Disclosed is a map display device including means for superimposing and displaying a map and a vector map on the lower side and the vector map on the upper side.

Further, according to the present invention, one pixel is composed of a color component in which the reference display brightness is added, one pixel value is composed of a pixel value corresponding to the color component, and one pixel is composed of the color component, A storage unit that stores a vector map in which one pixel value is a pixel value corresponding to this color component, a color map table that registers a correspondence relationship between the reference color component and the pixel value for each of the image map and the vector map,
Instead of the reference color component of the image map during superimposition display, a correction color component in which a display brightness lower than the reference display brightness is added is added, and the color map is provided so as to include the relationship between the correction color component and the pixel value. By referring to the means for correcting the table and the corrected color map table at the time of superimposition display, the corresponding color component is obtained from the pixel value of each pixel of the image map and the vector map read from the storage unit, and the image map is obtained. Disclosed is a map display device including a display unit for performing superimposed display with the vector map on the lower side and the vector map on the upper side.

Further, in the present invention, in the above display means,
The pixels of the image map are displayed as they are, the pixels of the image map are displayed as they are, the pixels of the vector map are displayed as they are, and the pixels where the pixels of the image map and the pixels of vector map are overlapped are vector maps. Disclosed is a map display device configured to display only the pixels.

[0012]

1 is a diagram showing an embodiment of a map display device of the present invention. This display device includes an input device 1, an arithmetic processing device 2, a display unit 3, and an external storage device 4. The input device 1 includes a keyboard and a mouse, and inputs while interacting with the display content of the display unit 3. This input includes the input for setting the brightness level, the input for changing the color map, the input for the graphic search, the input for instructing the display, and the map processing represented by the enlargement / reduction of the map. There are inputs to do, etc.

The arithmetic processing unit 2 performs a process based on each of the above inputs, and displays it on the display unit 3. External storage device 4
Is a so-called map database, which has an area 30 storing image map data and an area 31 storing vector map data. The image maps and vector maps of the areas 30 and 31 are loaded into the high speed memory 16 based on a request from the arithmetic processing unit 2. Here, the image map is a general term for map data in a format such that a map called an ordinary paper map is read by a raster scan method. A vector map is a general term for map data expressed by vector elements such as squares, straight lines, and circles. In the map, topographic maps of prefectures are preferably represented by image maps, and maps such as residential maps are preferably represented by vector maps. In any case, when the map is converted into data, it is divided into a vector map and an image map. In addition to this, there is an example in which one map is obtained by superimposing a vector map and an image map upon display.

The arithmetic processing unit 2 has the following configuration. Dialogue control device processing unit 10 ... Intervenes processingally between the input device 1 and the display unit 3, and performs various input from the input device 1 and associated display processing. Brightness level setting unit 11 ... Sets the brightness level of a pixel to be displayed on the display unit 3. The brightness level is set by the operator's operation on the screen from the input device 1. Color map change processing unit 12 ... Performs a process of changing the contents of the color map table. Also in this processing, the case where the operator operates the screen from the input device 1
It may depend on the display state of the map. Search processing unit 13 ... Searches a map to be displayed and displays it on the display unit 3. The search target location is the external storage device 4.
Contents of areas 30, 31 and / or memory area 16
It is the contents of. This search is also performed by the operation of the operator looking at the screen from the input device 1. Drawing processing unit 14 ... Writes and reads map data to the drawing memory area 24 in the memory area 16. The drawing memory area 24 has a capacity considerably larger than the display size. Display processing unit 15 ... Performs preprocessing required for display on the display unit 3 (for example, conversion of display data into a video signal). Area 16 ... A memory area that can be accessed at high speed, and includes an image map display control data area 20, an image map data area 21, a vector map data area 22, a color map table 23, and a drawing memory area 24. Areas 21 and 22 are areas for storing so-called map data to be displayed, and the drawing processing unit 14 draws this map data in the drawing memory area 24. This area 24
The display processing unit 15 reads out the data and displays it on the display unit 3.

FIG. 2 shows the contents of the image map display control data area 20. An area 20 is an area for storing the image map display brightness L and L ₀ shown in FIG. 2A, a reference display color table (B color) of the image map shown in FIG. 2B, and FIG. It has a display color table (L color) corresponding to the brightness of the image map shown. The level L ₀ is a value of the reference display brightness of the image map, and the level L is given in the superimposed display. It is a value of the display brightness of the image map, and has a relationship of 0 <L <L ₀ . L is a value in which the display brightness of the image map is smaller than the reference display brightness so that the vector map is relatively easy to see when the image map is displayed on the lower side and the vector map is displayed on the upper side. The values L and L ₀ can be freely set by the operator.
Note that L ₀ may be set to 100% and L may be set as a percentage. Further, at the time of this setting, it is advisable to display the image map on the screen, display the percentage also on the screen, and determine L while observing the brightness of the image map.

The table (B color) of FIG. 2B shows the reference display colors of the image map, and is the R, G,
It is a combination of B. i is the number of the reference display color, i = 0 to 9 (that is, the number of reference colors is 10),
R _i , G _i and B _i are values in the range of 0 ≦ R _i ≦ 255 0 ≦ G _i ≦ 255 0 ≦ B _i ≦ 255. The R _i , G _i , and B _i are values that reflect the reference display brightness L ₀ . For example, L ₀ is 100% of the percentage
, L ₀ = 1 and it is not necessary to consider L ₀ . Specifically, when i = 0, R ₀ , G ₀ , and B ₀ are obtained, but these R ₀ , G ₀ , and B ₀ are as follows. R ₀ ... R component of standard display color number 0 of image map G ₀ ... G component of standard display color number 0 of image map B ₀ ... B component of standard display color number 0 of image map

Specifically, the reference display colors of the image map are, for example, the following 10 colors. Two types of monochrome (background color is white. Foreground color is black), black, blue, green, cyan,
Red, azenda, yellow, white

The table (L color) of FIG. 2C is a table in which the contents of the table (B color) of FIG. 2B are modified so as to correspond to the luminance L of FIG. 2A. . That is, the ten reference colors i = 0 to 9 are corrected with the luminance L as follows. An example of i = 0 is shown. L is a percentage notation and is a value such as 0.5, 0.7, or 0.3. R ₀ ′ = R ₀ × (L / L ₀ ) G ₀ ′ = R ₀ × (L / L ₀ ) B ₀ ′ = R ₀ × (L / L ₀ ), thus obtained R ₀ ′ and G ₀ ′ , B ₀ 'is, R _0' ... R component G ₀ '... image G component B ₀ of the luminance L corresponding display color numbers 0 map' of the luminance L corresponding display color number 0 image map ... luminance L corresponding image map It is the B component of display color number 0. For example, if L = 0.5 (50%), then R ₀ ′
= 0.5R ₀ , G ₀ ′ = 0.5G ₀ , B ₀ ′ = 0.5B ₀ .

FIG. 3 is a diagram showing a color map table. The color map table is a table showing the correspondence between the reference color of the pixel display color including the vector map and the image map and the pixel value. In the case of an 8-plane memory, the number of data is j = 0 to 255. However, this j corresponds to the pixel value. That is, the combination of r, g, and b is associated with the pixel value. The pixels of the image map and the vector map to be actually displayed are represented by pixel values. Therefore, when displaying this pixel, the corresponding r, g, and b are read from the pixel value of this pixel by referring to the color map table in FIG. 3, and this is displayed as a color component. The contents of the table are
For example, in the case of j = 255 (that is, the pixel value is 255), it is composed of R, G, and B components (r ₂₅₅ , g ₂₅₅ , b ₂₅₅ ).

FIG. 4 shows a specific allocation example of the color map table and its explanatory view. However, X window system: 96 colors, image map (draft): 10 colors (8 colors, 2 monochrome), vector map: 16 colors (including transparent color).

FIG. 4A is an explanatory view of plane management in the 8-plane frame memory. For 8 bits of 8 planes, 4 bits obtained in parallel from 1 to 4 sheets are used as vector data, and 4 bits obtained in parallel from 5 sheets to 8 sheets are used as image data.

FIG. 4B is a diagram showing the relationship between the image map pixel values and the corresponding reference display colors (8 colors, 2 monochrome), which constitutes a part of the color map table. Among the 8 planes, 1 to 4 sheets of parallel 4-bit data (lower 4 digits) are all zero (0000), and 5 to 8 sheets.
The parallel 4-bit data (upper 4 digits) of the sheet is set to take the pixel value corresponding to the reference color. For example, in blue the pixel value is 10010000 in binary display,
1001 is for the upper 4 digits, and 0000 is for the lower 4 digits.
When this binary number is shown in decimal notation, the pixel value is 144
Becomes The same applies to other colors.

FIG. 4C is a diagram showing the relationship between vector pixel values forming a part of the color map table and corresponding reference colors (16 colors including transparent colors). In 8 planes, 1 to 4 pieces of parallel 4-bit data (lower 4 digits) represent 16 colors, and 5 to 8 pieces of parallel 4-bit data (upper 4 digits) are 0110 (decimal). It is assigned to 96) on the display. For example, an example pixel value for yellow is 011
0 0111, 0110 is the upper 4 digits, 0111
Are the lower 4 digits.

FIG. 5 shows the conventions of FIGS. 4 (a) to 4 (c) (the upper four digits of the vector pixel value are 0110 or more).
Pixel values 96 to 25 in the color map table based on
5 is shown. However, the pixel value is not in the binary data format but in the decimal notation. A table size of 10 × 16 was obtained by taking 10 columns in the horizontal direction and 16 rows in the vertical direction.
"96, 112, 128, 144, ..., 24 in the bottom line A
4, 240 ”indicates the image pixel value in FIG. "96, 97, 98, 99, for one row B at the left end
..., 110, 111 "indicates the vector pixel value of FIG. The other parts (part C surrounded by the dotted line) are
The pixel value group for fusion display in the present invention (that is, the vector pixel value group when the image data is used as a background and the vector data is fusion-displayed on the upper side) is shown.

For example, an example of the pixel values 127 and 150 is as follows. Pixel value = 127 The background color of the image is white (white) (pixel value is 112)
The pixel value when the upper side is the vector blue violet (pixel value is 111), and the display color indicated by this pixel value is the vector blue violet. That is, when the pixels of the image map and the pixels of the vector map overlap each other, the vector blue violet is displayed instead of the image color (white). By leaving the color of the vector displayed on the upper side, the pixels of the vector can be highlighted.

Pixel value = 150 The pixel value when the background is the background color (blue) (pixel value is 144) and the upper side is magenta (pixel value is 102) is shown. This pixel value 150 is the magenta of the vector. The reason for leaving magenta is the same. FIG.
The reason that the upper four digits are fixed to 0110 in (c) is to match the value "96" at the lower left portion of FIG. Pixel values less than 96 are used for another map. For example, pixel values 0 to 63 are used for motifs (Motif) (for window manager applications), and 64-95 are used for photographs (grayscale 32 gradations).

FIG. 6 is a diagram for explanation, and shows an example of development of a specific relationship between pixel values and reference display colors in the color map table. Pixel values are shown on the left and applications are shown on the right. Hereinafter, although it overlaps with FIG. 5, it will be briefly described. Pixel value (PIX _n ) is 0 to 63, 6
4 to 95 are used for other purposes. Pixel value (PIX
_n ) of 96 to 240 are pixel values for image maps. Pixel values (PIX _n ) of 97 to 255 are pixel values for vector maps. Among these, for example, 9
7, 113, 129, ..., 241 are colors (black). Reference numerals 106, 122, 138, ..., 250 are color (yellowish brown).

FIG. 7 shows a processing flow by the color map change processing unit 12. In step S ₁ , the type of display map is determined. If it is an image map, step S ₃ , if it is a vector map, the color map changing process is not performed, and the process ends. If it is the superimposed display of the image map and the vector map, the process proceeds to step S ₂ . Here, the superimposed display means that an image map and a vector map are superimposed and displayed as a sketch. In particular, in this superimposed display,
The image map is displayed with the brightness reduced, and in the case of overlapping pixels, the display color of the vector pixel is left as it is. By using this method, the vector map will be displayed clearly. Therefore, it can be called a fused display. If it is an image map, in step S ₃ , the reference display color (B color) of the image map of FIG. 2B is stored as it is in the luminance corresponding display color table (L color) of FIG. 2C.

In the case of fusion display of the image map and the vector map, in step S ₂ , the display color corresponding to the brightness is calculated from the brightness L and the reference display color (B color) of FIG. It is stored in the luminance correspondence display color table (L color) of c). The calculation formula is as described above.

In step S ₄ , the luminance correspondence display color table (L color) obtained in steps S ₂ and S ₃ is stored in the entry (address) corresponding to the image map display pixel value of the color map table.

This step S ₄ will be described in detail. FIG.
As shown in (b), the pixel values of the image map correspond to the reference display colors, and this correspondence relationship is registered as a table as shown in FIG. 2 (b). This is newly shown as FIG. 6 (b). The ten addresses i = 0 to 9 correspond to the pixel values 96, 112, 12 in the bottom row of FIG.
, ..., 240. If the pixel value is 96,
(R ₀ , G ₀ , B ₀ ) at i = 0 is the reference color.

FIG. 8B shows the brightness level corresponding display color table shown in FIG. 2C, and similarly, i = 0 to 9 = 1.
0 addresses are pixel values 96, 1 in the bottom row of FIG.
12, 128, ..., 240. This display color is not the reference color shown in FIG. 4B, but the display color composed of R ', G', and B'in FIG. 2C modified according to the brightness level. However, the display color after step S ₃ is the reference display color R, G, B itself, and the display color after step S ₂ is the display color R ′, G ′, B ′ after the previous change.

The step S ₄ is such steps S ₂ , S
The contents of the corresponding display color table obtained through ₃ are registered in correspondence with the pixel values, that is, corrected and registered in association with the pixel values on the color map table. Pixel value correspondence means that the addresses i = 0 to 9 in FIG. 6B are made to correspond to pixel values as shown in parentheses. Thus, for example, if the pixel value 96, the display color when passing through the step _{S 2 (R 0 ', G} 0', B 0 ') is selected, display color when passing through the step S ₃ (R ₀ , G ₀ , B ₀ ) are selected.

FIG. 9 shows the byte structure of the drawing memory. FIG. 9A shows 8 bits (that is, 8 plane memory).
The composition of the pixel value of the composition is shown. The lower 4 pits are vectors and the upper 4 bits are pixel values of the image. FIG.
8B is a vector display, FIG. 8C is an image display,
FIG. 9D shows an example of vector and image fusion display.

FIG. 10 shows an example of specific data in the drawing memory 24 and an example of its display. Since the size of the drawing memory is simple, it is set to 8 × 8. 10 (a) (i) is a vector display, in which the pixel value 103 is from the coordinate (1,1) to the rightward 45 ° (8,8) and the pixel value is from the coordinate (8,1) to the leftward 45 °. The pixel value 101 was stored up to (1, 8). The pixel value 103 is yellow as seen from FIGS. 5 and 6, and the pixel value 101 is red as seen from FIGS. Therefore, when displaying, the colors corresponding to the pixel values 101 and 103 are read from the color map table of FIG. 3 and displayed on the screen. The display result is shown in (ii) of FIG.

FIGS. 10 (b) and (ii) are image displays, in which the pixel value of the outermost peripheral rectangular coordinate of the 8 × 8 size memory is 240, and the pixel value of the coordinate of the entire inner peripheral rectangle is 14.
4 is an example. The display result is shown in (i) of FIG.
i).

FIGS. 10 (c) and (i) show an example of vector and image display (fusion display). This fusion display is shown in Fig. 1.
It means that the image of 0 (b) is on the lower side and the vector of FIG. Here, in the pixel (coordinate) where the image pixel value exists and the vector pixel value does not exist above it, the pixel value of the image is left as it is. On the contrary, in a pixel in which there is no image pixel value but only vector pixel value, the vector pixel value is left as it is (however, as can be seen from FIG. 10B, the image pixel value exists in all coordinates. Therefore, the pixel having only the vector pixel value is shown in FIG.
0 does not exist. The former examples are (1, 2), (1,
3), ..., Pixel values of (1, 7) 240, (2,
1), (3, 1), ..., (7, 1) pixel value 24
Pixel values 144 of 0, (2,3), (2,4), ..., (2,6), and so on.

Pixels where the two overlap are only the X-shaped display example of FIG. When fusing pixel values,
It looks like this: In FIG. 10A, the pixel value is 10
3 and 101, the image pixel values are overlapped as shown in FIG. Therefore, the pixel value 103 of the coordinates (1, 1) is changed to the pixel value 247 with reference to FIGS. 3 and 6 because the background image pixel value is 240. The pixel value 103 of the coordinate (2, 2) is changed to the pixel value 151 with reference to FIGS. 3 and 6 because the background image pixel value is 144.・ The same applies to other coordinates. The state of the pixel values obtained in this way is shown in Fig. 10 (c) (i)
It is shown in The display is shown in FIGS. For this fusion display of the vector and the image of FIG. 10 (c) (i), refer to the corrected color map table of FIG. 3 or FIG.
The G and B components are read out and displayed as color components. In FIGS. 10A and 10B, the color map table before correction is referred to. Further, in order to display the image map after the fusion display, the color map table before correction is referred to. -In the fusion display, for example, 103 is 247, 14
4 was changed to 151, respectively, in order to make the drawing of the image map and the drawing of the vector map independent. There is also an example in which the processing is performed as it is at 103 or 144 without this change.

An example of drawing processing of the drawing memory area 24 in the fusion display of vectors and images will be shown. First, the pixel value (60) ₁₆ (shown in hexadecimal notation) is stored in the entire area of the drawing memory, and the memory is cleared with the monochrome foreground color. In (60) ₁₆ → pixel ′ vector display, only the vector portion of the pixel shown in FIG. 9A is changed to a new display color. When vector yellow (vector color number 7) is drawn on the monochrome foreground (60) ₁₆ , the pixel value becomes (67) ₁₆ = 103 as shown in B of FIG. 5 and FIG. 9B. (Pixel) AND (F0) ₁₆ OR (0 ⁽ⁱ⁾ ) ₁₆ → pixe
l'where (i) is the vector color number (1 to 15)
l indicates the pixel value of the pixel before the change, and pixel ′ indicates the pixel value of the pixel after the change.

In image display, only the image part of the pixel shown in FIG. 9A is changed to a new display color. When the image white (image color number 9) is drawn on the monochrome foreground (60) ₁₆ , the pixel values are shown in FIG.
(F0) ₁₆ = 240 as shown in (c). Also,
When the image blue color (image color number 3) is drawn on the monochrome foreground (60) ₁₆ , the pixel value becomes (90) ₁₆ = 144 as shown in A of FIG. 5 and FIG. 9C. (Pixel) AND (0F) ₁₆ OR ( ^(j) 0) ₁₆ → pixe
l ′ Here, (j) indicates a vector color number (0 to 9).

In the fused display, the vector portion and the image portion of the pixel shown in FIG. 9A are changed to new display colors. As described above, when the vector yellow is drawn on the monochrome foreground (60) ₁₆ , the pixel value becomes 103 as shown in FIGS. 5B and 9B. When the white color of the image is drawn on the same pixel, the pixel value becomes C of FIG.
It becomes 247 as shown in (d). Since the vector value yellow is set to the pixel value 247 of the color map table, the vector is displayed on the upper side in the fusion display.

In the same pixel, when only the vector is erased, the white color of the image is displayed. This can be achieved by clearing only the vector portion of the pixel in the vector erasing process and setting the pixel value as shown in A of FIG. 5 and FIG. 9C to 240. (Pixel) AND (F0) ₁₆ → pixel ′ Or, in the same pixel of fusion display, when only the image is erased, the vector yellow remains displayed but the pixel value becomes 103, which is the same value as vector display.
This can be achieved by clearing only the image portion of the pixel in the image erasing process so that the pixel value becomes 103 as shown in FIGS. 5B and 9B. (Pixel) AND (0F) ₁₆ + (60) ₁₆ → pixel '

In the above embodiment, the display brightness of the image map is changed to be low. However, conversely, the display brightness of the vector map can be changed and the value can be increased. There is also a method of display color that uses color components other than the three components of R, G, and B. In addition, there is a method of reflecting the display brightness other than multiplication. It can also be applied to an example in which the vector map is on the lower side.

[0044]

According to the present invention, it is possible to perform superimposition display with the image map on the lower side and the vector map on the upper side, and where the vector map pixel exists, the display color of that pixel always takes precedence. It is possible to display the image map with the original brightness lowered in a place where the pixel of the vector map does not exist. Thus, it became possible to perform fusion display in which the vector map is clearly displayed.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of a display device of the present invention.

FIG. 2 is a diagram showing an example of display control data of the present invention.

FIG. 3 is a diagram showing a color map table of the present invention.

FIG. 4 is a diagram showing a data configuration example of the present invention.

FIG. 5 is a diagram showing an example of pixel values of the present invention.

FIG. 6 is a specific application example development diagram of the pixel value of the present invention.

FIG. 7 is an example flow chart of a color map table changing process according to the present invention.

FIG. 8 is a diagram showing an example of a luminance-corresponding display color table of the present invention.

FIG. 9 is a diagram showing a byte configuration example of a drawing memory of the present invention.

FIG. 10 is a diagram showing various display examples of the present invention.

[Explanation of symbols]

 1 Input Device 2 Arithmetic Processing Device 3 Display Unit 4 External Storage Device 10 Dialog Control Processing Unit 11 Brightness Level Setting Unit 12 Color Map Change Processing Unit 13 Search Processing Unit 14 Drawing Processing Unit 15 Display Processing Unit 16 High Speed Memory Area

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location G09G 5/36 510 G09G 5/36 520N 520 G06F 15/62 310A 335 15/66 450 (72) Invention Person Kazune Kaya 3-2-1, Saiwaicho, Hitachi-shi, Ibaraki Hitachi Engineering Co., Ltd.

Claims (10)

[Claims] 1. Between the vector map and the image map,
A map display method in which the display brightness of at least one of the maps is changed to a value smaller than the reference display brightness during single display, and both maps are displayed in a superimposed manner including the display brightness after this change. 2. The display brightness of the image map of the reference display brightness is changed to a value smaller than the reference display brightness in the superimposed display, and the changed image map is displayed on the lower side and the vector map is displayed on the upper side. And the map display method. 3. The display brightness of the image map composed of the reference display brightness and the first reference display color is changed to a value smaller than the reference display brightness in the superimposed display, and the image map after the change is displayed on the lower side. In the map display method, a vector map composed of the second reference display color is superimposed and displayed on the upper side. 4. In the superimposed display, the pixels of the image map are displayed as they are for the pixels of the image map only, the pixels of the vector map are displayed as they are for the pixels of only the vector map, and the pixels of the image map and the pixels of the vector map are displayed. 4. The map display method according to claim 2 or 3, wherein only the pixels of the vector map are displayed for the pixels where and overlap. 5. The display brightness which is smaller than the reference display brightness can be set on the display screen.
Map display method. 6. A storage unit for storing an image map composed of a reference display brightness and a first reference display color, and a vector map composed of a second reference display color, and a display brightness of the image map. Means for changing to a small value during superimposition display, a processing unit that searches the image map and vector map from the storage unit and performs processing such as enlargement and reduction, and the processed image map and vector map as described above. A map display device comprising: means for superimposing and displaying an image map having the changed display brightness on the lower side and a vector map on the upper side. 7. An image map in which one pixel is composed of color components in which reference display brightness is added, and one pixel value is composed of pixel values corresponding to this color component, and one pixel is composed of color components A storage unit that stores a vector map with one pixel value corresponding to the pixel value, a color map table that registers the correspondence between the reference color component and the pixel value for each of the image map and the vector map, and the image at the time of overlay display. Instead of the reference color component of the map, a correction color component in consideration of display luminance lower than the reference display luminance is given, and the color map table is corrected so as to include the relationship between the correction color component and the pixel value. And a pixel for each pixel of the image map and the vector map read from the storage unit by referring to the corrected color map table at the time of superimposition display A map display device comprising: a display unit that obtains a corresponding color component from a value and performs superimposed display with an image map on the lower side and a vector map on the upper side. 8. The display means displays the pixels of the image map as they are for the pixels of the image map only, and displays the pixels of the vector map as they are for the pixels of the vector map only. The map display device according to claim 6 or 7, wherein only pixels of the vector map are displayed for pixels overlapping the pixels of the vector map. 9. The color component considering the reference display brightness on the image map is the reference display brightness L ₀ for each of the red (R), green (G), and blue (B) components r, g, and b. When
The map display device according to claim 7, wherein the map display device comprises rL ₀ , gL ₀ , and bL ₀ , and rL, gL, and bL for a display luminance L where L <L ₀ is the correction color component. 10. The map display device according to claim 7, wherein the image map alone after the superimposed display is displayed by using the color map table before correction.