EP0738876A2
Expired / Lapsed
EP
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Map display apparatus
Assignee: Hitachi Ltd
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Filing: 1996-04-19
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Granted: —
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Expires: 2016-04-19
Abstract
Abstract A navigation apparatus for displaying most appropriately information such as character strings, routes, etc., when a map is displayed by bird's-eye view display. The navigation apparatus includes a portion (1) for calculating the present position on the basis of information from sensors (S5-S8), a portion for executing perspective conversion operation for displaying a map by bird's-eye view display, a portion for disposing the present position or the present position and a position representing a destination at the most suitable positions, a portion for controlling so that overlap of character strings can be eliminated, a portion for controlling the same character strings, a portion for displaying most appropriately a background such as lines and planes, a portion (70) for controlling marks to be displayed, and a portion (71) for executing graphic plotting by using the resulting map data.
Inventors
- 👤 Yoshinori Endo
- 👤 Toshio Fujiwara
- 👤 Hiroshi Shojima
- 👤 Motoki Hirano
- 👤 Kaoru Harada
- 👤 Tetsumori Aikawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 15:47
CPC Classifications
G; G01; G01C; G01C21/00; G01C21/26; G01C21/34; G01C21/36; G01C21/3667; G01C21/3673; G01C21/3626; G01C21/3635; G09; G09B; G09B29/00; G09B29/003; G09B29/005; G09B29/10
Claims Analysis
Total Claims: 37
Claim 1
Independent Claim
98 words
A map display apparatus comprising: memory means (3) for storing map data necessary for plotting a map of a predetermined region; character data selection means (84) for selecting a character string having a predetermined attribute from character data read out from said memory means (3); character data display means for executing perspective conversion of the character data selected by said character selection means (84) and displaying it by bird's-eye view display; and vector data display means (65) for executing perspective conversion for vector data read out from said memory means (3) and displaying it by bird's-eye view display.
Claim 2
Dependent Claim
59 words
A map display apparatus according to claim 1, wherein said character data selection means (84) comprises: character overlap judgement means (1102) for judging overlap between different character strings; and character string selection means (1101) for selecting a character string having a predetermined attribute for those character strings which are judged as overlapping by said character overlap judgement means (1101).
Claim 3
Dependent Claim
61 words
A map display apparatus according to claim 1, wherein said character data selection means comprises: character overlap judgement means (1102) for judging overlap between different character strings; and character string selection means (1101) for selecting a character string in the proximity of a visual point for those character strings which are judged as overlapping by said character overlap judgement means (1102).
Claim 4
Dependent Claim
51 words
A map display apparatus according to claim 1, wherein said character data selection means comprises: character overlap judgement means (1102) for judging overlap between different character strings; and font substitution means for a smaller font for those character strings which are judged as overlapping by said character overlap judgement means (1102).
Claim 5
Dependent Claim
35 words
A map display apparatus according to any of claims 2 through 4, wherein said character overlap judgement means (1102) judges overlap between character strings by using a rectangular region information circumscribed with the character strings.
Claim 6
Dependent Claim
48 words
A map display apparatus according to any of claims 2 through 4, wherein said character overlap judgement means (1102) judges overlap between character strings by using a rectangular region information of a rectangle situated more inward by a predetermined distance from a rectangle circumscribed with the character strings.
Claim 7
Dependent Claim
44 words
A map display apparatus according to any of claims 2 through 4, wherein said character overlap judgement means (1102) judges overlap by using a polygonal region information of a polygon situated more inward by a predetermined distance from a polygon encompassing the character strings.
Claim 8
Dependent Claim
121 words
A map display apparatus comprising: memory means (3) for storing map data necessary for plotting a map of a predetermined region; same character string selection means (1107) for selecting the same character strings from character data read out from said memory means (3); character data selection means (1064) for selecting a predetermined character string from the same character string selected by said same character string selection means (1107); character data display means (1007) for executing perspective conversion for the character string selected by said character data selection means and displaying it by bird's-eye view display; and vector data display means for executing perspective conversion for vector data read out from said memory means (1007) and displaying it by bird's-eye view display.
Claim 9
Dependent Claim
26 words
A map display apparatus according to claim 8, wherein said character data selection means (1106) selects a character string in the proximity of a visual point.
Claim 10
Dependent Claim
44 words
A map display apparatus according to claim 8, wherein said same character string selection means (1107) judges character strings as the same character strings when the distance between the character strings that are judged as the same character string is within a predetermined range.
Claim 11
Dependent Claim
52 words
A map display apparatus according to claim 8, wherein said same character string selection means (1107) judges character strings as the same character when the character strings judged as the same character string are subjected to perspective conversion and are displayed, and when the distance between them is within a predetermined range.
Claim 12
Dependent Claim
87 words
A map display apparatus comprising: memory means (3) for storing map data necessary for plotting a map of a predetermined region; map display means (65) for displaying a bird's-eye view map by using map data read out from said memory means (3); route calculation means (62) for selecting an optimum road connecting the present position to a destination; and vector data display means (1007) for executing perspective conversion for the route calculated by said route calculation means and displaying it in superposition with a bird's-eye view map.
Claim 13
Dependent Claim
37 words
A map display apparatus according to claim 12, wherein said vector data display means (1067) displays a route in the proximity of a visual point by a greater line width than routes away from the visual point.
Claim 14
Dependent Claim
43 words
A map display apparatus according to claim 12, wherein said vector data display means (1067) decides a line width representing a route depending on a region in which the region calculated by said route calculation means (62) is displayed, and displays the route.
Claim 15
Dependent Claim
101 words
A map display apparatus comprising: memory means (3) for storing map data necessary for plotting a map of a predetermined region; map display means (65) for displaying a bird's-eye view map by using map data read out from said memory means; driving orbit memory means (65) for storing a driving orbit of own car; and driving orbit display means (71) for executing perspective conversion of a plurality of routes stored in said driving orbit memory means and displaying them in such a manner that the gaps between orbit dot strings become equidistant when said routes are displayed by bird's-eye view display.
Claim 16
Dependent Claim
57 words
A map display apparatus according to claim 15, wherein said driving orbit display means (65) thins out the orbit data so that orbit point strings become equidistant when a plurality of orbits stored in said driving orbit memory means (69) are subjected to perspective conversion and are displayed by bird's-eye view display, and displays the orbit data.
Claim 17
Dependent Claim
53 words
A map display apparatus according to claim 15, wherein said driving orbit memory means (69) calculates interpolation points of orbit data so that the orbit point strings are equidistant, when a plurality of orbits stored in said driving orbit memory means (69) are subjected to perspective conversion and are displayed, and displays them.
Claim 18
Dependent Claim
91 words
A map display apparatus comprising: memory means (3) for storing map data necessary for plotting a map of a predetermined region; background data display means (86) for executing perspective conversion of each apex when a pattern exists in the background data read out from said memory means (3), and displaying the background data by using a pattern used for a plan view map display; and character data display means (65) for executing perspective conversion for the character data read out from said memory means and displaying it by bird's-eye view display.
Claim 19
Dependent Claim
56 words
A map display apparatus according to claim 18, wherein said background data display means (65) includes means (1007) for executing perspective conversion of each apex of a vector when a pattern exists in the background data constituted by vector data, and displaying it by vector display by using a pattern used for plan view map display.
Claim 20
Dependent Claim
52 words
A map display apparatus according to claim 18, wherein said background data display means (65) includes means for executing perspective conversion of each apex constituting a polygon when a pattern exists inside the polygon encompassed by polygonal data, and displaying the polygon by using a pattern used for plan view map display.
Claim 21
Dependent Claim
122 words
A map display apparatus comprising: memory means (3) for storing map data necessary for plotting a map of a predetermined region; map display means (65) for displaying a bird's-eye view map by using the map data read out from said memory means; display region limiting means (81) for limiting regions for bird's-eye view display to those regions existing on the foreground side from a disappearing point of perspective conversion; background display means (86) for displaying an artificial background such as a horizontal line and sky in the regions for which map display is limited by said display region limiting means; and background region control means (86) for changing colors and patterns of the artificial background regions displayed by said background display means.
Claim 22
Dependent Claim
46 words
A map display apparatus according to claim 21, wherein said background region control means (86) changes the colors or patterns of the artificial background region in accordance with signals from a car having said map display apparatus mounted thereto or with the condition of said car.
Claim 23
Dependent Claim
43 words
A map display apparatus according to claim 21, wherein said background region control means (86) changes the colors or patterns of the artificial background region in accordance with the ON/OFF state of lamps of a car having said map display apparatus mounted thereto.
Claim 24
Dependent Claim
91 words
A map display apparatus comprising: memory means (3) for storing map data necessary for plotting a map of a predetermined region; map display means (65) for displaying a bird's-eye view map and a plan view map by using the map data read out from said memory means; mark selection means (70) for selecting a mark to be displayed in superposition with the bird's-eye view map or the plan view map; and mark display means (71) for displaying the mark in superposition with the bird's-eye view map and the plan view map.
Claim 25
Dependent Claim
49 words
A map display apparatus according to claim 24, wherein said mark selection means (70) selects and displays a mark representing the plan view display during display of the plan view map, and selects and displays a mark representing the bird's-eye view display during display of the bird's-eye view map.
Claim 26
Dependent Claim
34 words
A map display apparatus according to claim 24, wherein said mark selection means changes the shape of the mark representing the present position in both the bird's-eye view map and the plan view map.
Claim 27
Dependent Claim
42 words
A map display apparatus according to claim 24, wherein said mark selection means (70) changes the shape of the mark representing the present position in accordance with the position of a visual point and a projection angle in the bird's-eye view map.
Claim 28
Dependent Claim
45 words
A map display apparatus according to claim 24, wherein said mark selection means (70) displays a mark representing the reduced scale of a map in the plan view map and eliminates the mark representing the reduced scale of the map in bird's-eye view map display.
Claim 29
Dependent Claim
104 words
A map display apparatus comprising: memory means (3) for storing map data necessary for display a map of a predetermined region; destination inputting means (5) for setting a destination; coefficient decision means (61) for deciding the position of a visual point and a projection angle so that a destination can be displayed in a predetermined direction of a display screen; and map display means (65) for executing perspective conversion of the map data read out from said memory means and the position of the visual point as well as the projection angle obtained by said coefficient decision means, and displaying a bird's-eye view map.
Claim 30
Dependent Claim
67 words
A map display apparatus according to claim 29, wherein said coefficient decision means (61) decides the position of the visual point and the projection angle so that the present position obtained from present position detection means (66) for detecting the present position of a car is fixedly displayed at a certain predetermined point in a lower 1/3 region of the screen of said map display means (2).
Claim 31
Dependent Claim
142 words
A map display apparatus comprising: memory means (3) for storing map data necessary for displaying a map of a predetermined region; present position detection means (S5-S8) for detecting a predetermined position of a car; present position display position setting means (81) for deciding a screen display position of the present position obtained by said present position detection means (S5-S8); coefficient decision means (61) for deciding the position of a visual point and a projection angle so that the present position is displayed by bird's-eye view display at the screen display position set by said present position display position setting means; and map display means (65) for executing perspective conversion of the map data read out from said memory means by the position of the visual point and the projection angle obtained by said coefficient decision means, and displaying a bird's-eye view map.
Claim 32
Dependent Claim
38 words
A map display apparatus according to claim 31, wherein the present position display position setting means (S5-S8) decides the screen display position of the present position so that the number of objects having the same attribute becomes small.
Claim 33
Dependent Claim
37 words
A map display apparatus according to claim 31, wherein said present position display position setting means (1011) decides the screen display position of the present position so that the number of objects to be displayed becomes great.
Claim 34
Dependent Claim
99 words
A graphic display apparatus comprising: character kind judgement means (1201) for judging whether or not one symbol or one character should be represented by a plurality of characters; first character plotting means (1205, 1206) for plotting a character by a typeface not having decoration when said character kind judgement means judges that one symbol or one character should be represented by a plurality of characters; and second character plotting means (1208, 1209) for plotting a character with decoration when said character kind judgement means judges that one symbol or one character should be represented by a plurality of characters.
Claim 35
Dependent Claim
34 words
A graphic display apparatus according to claim 34, wherein said character kind judgement means judges whether or not one symbol or one character should be represented by a plurality of characters and character codes.
Claim 36
Dependent Claim
71 words
A graphic display apparatus comprising: character overlap judgement means (1203) for judging whether or not overlap of characters occurs between a plurality of characters; first character plotting means (1205, 1206) for plotting a character by a typeface not having decoration; and second character plotting means (1208, 1209) for plotting a character by a typeface having decoration when overlap of characters is not judged as occurring by said character overlap judgement means.
Claim 37
Dependent Claim
22 words
A graphic display apparatus according to claim 34 or 36, wherein said second character plotting means (1208, 1209) plots a fringed character.
References Cited (Backward Citations)
No citation records indexed.
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