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WO1997049027A1 - Procede et appareil pour generer des images cartographiques de format homogene - Google Patents

Procede et appareil pour generer des images cartographiques de format homogene Download PDF

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Publication number
WO1997049027A1
WO1997049027A1 PCT/US1996/010708 US9610708W WO9749027A1 WO 1997049027 A1 WO1997049027 A1 WO 1997049027A1 US 9610708 W US9610708 W US 9610708W WO 9749027 A1 WO9749027 A1 WO 9749027A1
Authority
WO
WIPO (PCT)
Prior art keywords
map
map image
image
images
geographic area
Prior art date
Application number
PCT/US1996/010708
Other languages
English (en)
Inventor
William Ames Curtright
Edwin E. Parks
Kevin J. Roethe
Matthew T. Bieker
Original Assignee
Ames Research Laboratories
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ames Research Laboratories filed Critical Ames Research Laboratories
Priority to PL96330707A priority Critical patent/PL330707A1/xx
Priority to AU62873/96A priority patent/AU721447B2/en
Priority to PCT/US1996/010708 priority patent/WO1997049027A1/fr
Priority to CZ984110A priority patent/CZ411098A3/cs
Priority to CA002258578A priority patent/CA2258578A1/fr
Priority to JP09506061A priority patent/JP2000511308A/ja
Priority to EP96921734A priority patent/EP0934561A1/fr
Publication of WO1997049027A1 publication Critical patent/WO1997049027A1/fr
Priority to NO985890A priority patent/NO985890L/no

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T17/00—Three dimensional [3D] modelling, e.g. data description of 3D objects
    • G06T17/05—Geographic models
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
    • G09B29/00—Maps; Plans; Charts; Diagrams, e.g. route diagram
    • G09B29/003—Maps
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
    • G09B29/00—Maps; Plans; Charts; Diagrams, e.g. route diagram
    • G09B29/10—Map spot or coordinate position indicators; Map reading aids
    • G09B29/106—Map spot or coordinate position indicators; Map reading aids using electronic means

Definitions

  • This invention relates generally to image processing. More particularly, this invention relates to a method for converting printed maps into digitally stored images of a unique format.
  • Computer systems that can generate and display geographic map images are now commonly available.
  • a computer system that provides map images has stored within its memory system, such as in secondary storage, data corresponding to the map images.
  • the map image data if stored as bit maps, may be then be directly retrieved for display.
  • the map image data may be stored as information within a database, and the computer system may independently generate a map image from the database information.
  • a moving map system receives data from the Global Positioning System (GPS) satellites to determine the vehicle's current location.
  • GPS Global Positioning System
  • the moving map system uses this data to select geographic data stored in the system, such as on a CD-ROM, and retrieves therefrom a map image of the current location for display.
  • the map image is actually a changing combination of several images that are generated as the vehicle moves from one geographic location to another, giving the appearance that the map is moving.
  • a cursor on the map image shows the current vehicle location to the vehicle operator and allows him to navigate with the map image.
  • a drawback of present computer systems for displaying map images is the poor quality of the map images they display.
  • the detail of the map image is sparse. Only those geographic objects that are recorded within a database field appear on the image.
  • a map database may contain fields for locating objects on the map, but not provide a field for displaying topological features such as elevations and valleys.
  • systems that store detailed map images as bit maps do not store the images in a uniform format. Without a uniform format, the bit mapped images vary in size, making it difficult to accurately determine and display a vehicle's location on the map image. The varying size also leaves gaps on the screen as an image of one size is replaced by an image of another size.
  • An object of the invention is to provide a method for providing highly detailed map images in a uniform format.
  • This format should allow the computer system to display a cursor (i.e. , a point of interest) on the map image to accurately show a vehicle's geographic location.
  • This format should also allow the map images to seamlessly fit together so that no gaps appear on the display as one image is replace by another.
  • the map images When used in a moving map system, the map images should give the appearance of a unified image as the vehicle moves from one geographic area to another across individual map images.
  • Another object of the invention is to provide an apparatus on which map images of a uniform format are stored for easy retrieval into a computer system.
  • bit mapped map images corresponding to a printed map are provided.
  • a bit mapped map image is then cropped to select a map image corresponding to a desired geographic area, such as a one degree by one degree square.
  • the boundaries of the selected map image are selectively moved to shape the geographic area into a tessellated shape, such as a rectangle.
  • the selected map image is then re-sized to contain a predetermined pixel area.
  • the map image, now of a uniform format is then stored with an identifier of a reference point, such as a location, and size of the geographic area represented by the map image.
  • the identifier may be the name of a computer- readable file containing the map image.
  • the initial bit mapped map image may be obtained from a printed map through scanning or other known techniques for converting printed graphics into electronic images.
  • the desired geographic area may be defined on the map with reference grid lines such as latitude and longitude lines.
  • An apparatus may comprise a storage medium such as a CD-ROM on which are stored a plurality of bit mapped geographic map images in computer readable form. Each image has a predetermined pixel area and an identifier of a reference point and size of the geographic area represented by the map image. The identifier is preferably the name of the image file.
  • CD-ROMs and other devices imprinted in accordance with the method of the invention provide a unique store of map images which may be used in any number of way.
  • the map images are particularly valuable in moving map systems where it is desirable to view detailed graphic information on a display as a car, plane or other vehicle moves from one geographic location to another. Another valuable use is for constructing and printing custom maps.
  • a number of map images may be retrieved from the CD-ROM and combined into a larger map that covers a planned trip route.
  • the layer map image is then printed.
  • FIG. 1 is a pictorial diagram showing a computer system for converting printed maps into bit mapped map images according to the invention.
  • FIG. 2 is a pictorial diagram showing how a printed map is physically cut, partitioned, and edited using a method according to the invention.
  • FIG. 3 is a flow chart of the major steps of the method according to the invention.
  • FIG. 4 is a flow chart of the converting step of FIG. 3.
  • FIG. 5 is a flow chart of the formatting step of FIG. 3.
  • FIG. 6 is a flow chart of the storing step of FIG. 3.
  • FIG. 7 is a pictorial diagram showing how a map image is derived from two printed maps according to the invention.
  • FIG. 1 shows a computer 12, scanner 14 and a CD recordable device
  • printed maps are scanned by scanner 14, which converts them to digital electronic map images.
  • printed map is meant a map physically drawn on paper or other medium in a form recognizable by a human being, as opposed to a map image on a computer display screen or residing in computer memory.
  • These map images are then edited, using software running on computer 14, into a unique uniform format.
  • the edited images are then stored on a CD-ROM (Read Only Memory) with a directory, allowing the images to be easily retrieved when the CD-ROM is read in a CD-ROM drive.
  • CD-ROM Read Only Memory
  • Scanner 14 may be any type of scanning device capable of converting a printed map into an electronic image that may be stored in a computer-readable file on a medium such as a disk or tape. In the preferred embodiment, a drum scanner is used because of its large scanning surface.
  • Computer 12 may be a personal computer, workstation or any other device capable of editing graphical images contained in an electronic file. In the preferred embodiment, computer 12 is a personal computer containing a hard disk and a tape drive. The computer is equipped to run image editing software such as the Adobe PhotoshopTM computer program available from Adobe System Incorporated of Mountain View, California, which is hereby incorporated by reference.
  • Device 16 is a CD recordable device capable of writing data onto CD-ROMs.
  • a preferred form of the device is JVC model XR-W2001 CD-recordable drive with appropriate software (Personal Archiver or ROM Maker) for writing once to recordable compact discs.
  • device 16 is also equipped with a hard disk drive for reading map images and imprinting the image data onto a CD-ROM.
  • the preferred embodiment uses tapes for moving the map images from scanner 14 to computer 12 and a network for moving the images from computer 12 to CD- ROM device 16 It should be understood that the data may also be moved between these devices in other ways.
  • the map image data may be moved by transfer over wire, by disk, or by any other known way to transport data between devices.
  • FIGS. 2A-D broadly illustrate the steps of a method according to the invention for converting printed maps into digital map images of a uniform format. The major steps are described in the flow chart of FIG. 3, with the more detailed steps that comprise the major steps described in FIGS. 4-6.
  • the first step in the method is converting a printed map into a bit mapped map image that can be edited with a computer or equivalent device (40).
  • a bit mapped image is a raster image in which each pixel is represented by one or more bits, such as eight bits per pixel.
  • the map images are then edited into a uniform format (42).
  • the edited map images are stored in a manner such as on a CD-ROM that allows them to be quickly retrieved by a computer or equivalent device (44).
  • FIG. 4 shows the details of the converting step 40.
  • Printed maps of a significant size must first be cut or otherwise divided into sections that fit on scanner 14 (46).
  • FIG. 2A shows a printed map of the United States. To fit the scanner, the printed map is generally cut along its reference lines, such as the latitude and longitude lines that appear on many maps.
  • FIG. 2B shows a cut section with latitude lines 47 and longitude lines 49. Other reference lines might include the lettered and numbered lines that often appear on city maps.
  • the cut sections are as large as possible to minimize the effort required to cut and then scan the entire map.
  • the cut map sections are then scanned to convert them into digital images (48). Any scanner capable of scanning graphical images will likely work. However, in the preferred embodiment a drum scanner is used because it can scan larger map sections. Alternatively, other devices that are capable of converting printed maps into digital images may be used, such as a digital video cameras that capture images for storage in digital form.
  • the digital map images are then stored on tapes with a general identifier of their contents, such as the name of the map and map areas (50).
  • FIG. 5 shows the detailed steps that comprise editing a digital map image into an image of a uniform format.
  • a bit mapped map image file is loaded into computer 12 for editing with image editing software (60).
  • FIG. 2B shows an example of such a map image.
  • the bit mapped map image is cropped to select a map image corresponding to a desired geographic area, such as a one degree longitude by one degree latitude area (62). This area is preferably the area that all map images of a selected map type are cropped to.
  • FIG. 2C illustrates a cropped image.
  • the area between the reference grid lines (the longitude and latitude lines in the map of FIGS. 2A-D) is not rectangular because the latitude lines 47 curve upward and the longitude lines 49 taper inward.
  • This rounded shape presents two problems.
  • the actual size of one degree by one degree map images varies. Images with coordinates closer to the equator are larger than images closer to the poles. This makes locating a point on a map image difficult because the pixel relationship between image and map locations differ for each map. For example, if one map image is 600 pixels across and another is 400 pixels across, then relative to reference line, the 200th pixel represents a different map location in each map image.
  • the shape of the map images are not regular shapes that fit together to provide a seamless appearance such as rectangles, triangles, etc. These type of regular shapes are often called tessellated shapes. Irregular shapes cannot be seamlessly pieced together electronically once they have been divided and stored as bit maps. To overcome these difficulties, the images are edited using image editing software. Before beginning the editing process, however, the image may need to be rotated for the proper orientation (64, 66). This may be necessary because of the mis- orientation of the bit mapped map image when it was originally scanned.
  • the image is edited into a uniform format using the image editing software (68).
  • the image may be manipulated with the skewing and distorting functions, among others. However, depending on the size of the cropped image, it may be first partitioned into quadrants that are more easily edited. Again, this partitioning may be done with the cropping tool.
  • the bit mapped map image is cropped to encompass these lines.
  • the corners of the cropped image boundaries now have "handles" which can be selectively moved to square the geographic area into a rectangular shape using the editing tools.
  • a handle on one end of the line is selected and moved until the line is straight.
  • one end of a longitude 49 line can be moved so that the line is perpendicular to a straightened latitude line 47.
  • the selected map image which now contains the rectangularized geographic area, is further cropped to match the image area to the geographic area. This cropping step may be needed if the first cropping encompasses more than the geographical area. This manipulation is then performed on adjacent image quadrants, and the images re-combined into an image of a desired uniform format.
  • the selected map image is then re-sized to contain a predetermined pixel area (70).
  • the Image Size command may be used to accomplish this step.
  • the preferred pixel area is a rectangle of 720 pixels in width and 900 pixels in height.
  • CMYK cyan, magenta, yellow and black
  • RGB red, green blue
  • Additive colors combine to produce white light.
  • Additive colors are used for lighting, video, film recorders and display monitors. Because these map images are likely to be viewed primarily on display screens, it is desirable to change their color mode from CMYK to RGB. This change is necessary, of course, only if the map image is not in the RGB mode to begin with.
  • a map image is not sufficiently focused and must be sharpened to increase its clarity. If necessary, this may be done with a sharpen tool in the image edit software, which increases the contrast between pixels of the image (74).
  • the last step of the formatting process is converting similar colors of all selected map images to colors of a color palette common to all images (76). By using the same color palette, all maps have the same colors for the same types of features. "Movement" across several map images thus appears to be seamless.
  • the common color palette is a default palette.
  • FIG. 6 shows the steps involved in storing the images.
  • a reference point of the pixel area such as the intersection of the longitude and latitude of the western and northern map boundaries, is determined (80). This reference point may be an indicator of a geographic location.
  • the geographical area of the map image is also determined, such as one degree by one degree (82).
  • the map image is then stored with an identifier of the reference point and size of the geographical area (84).
  • the identifier is a name of a computer-readable file containing the image such as W121 46.
  • the W indicates the size of the geographic area and the numerals are the reference point.
  • the identifier may be any character string that ultimately can be used to identify the map's geographic area, such as an index to a look up table. Other naming conventions, of course, may be used so long as they reflect a reference point for the image and the geographical area represented by the image. Locations within a map image can be accurately determined from this information since all map images have the same pixel area. It then is a simple process to translate a geographical location into pixel coordinates. This process is repeated to convert one or more printed maps into a plurality of digital map images.
  • the edited map images are stored along with a file directory to network storage. From there the images are transferred to a hard disk drive associated with CD-ROM device 16. The device 16 reads the images and file directory from the drive and writes them onto a compact disc. The result is a disc containing a number of map images of a uniform format, all stored such that they can be individually and accurately retrieved for display or printing.
  • a desired map image appears partly on separate printed maps.
  • a one degree square section may overlap opposite sides of a map, such as illustrated in FIG. 7.
  • Each of these partial sections initially is scanned in as bit mapped map images.
  • Portions of the desired map image are then separately cropped from the bit mapped map images.
  • the two cropped portions are then merged into a single map image, which is edited in the manner described above.
  • bit mapped map images may already be available without scanning, in which case the method of the invention begins with providing the bit mapped map images.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Software Systems (AREA)
  • Geometry (AREA)
  • Business, Economics & Management (AREA)
  • Educational Administration (AREA)
  • Educational Technology (AREA)
  • Computer Graphics (AREA)
  • Remote Sensing (AREA)
  • Processing Or Creating Images (AREA)
  • Instructional Devices (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Image Processing (AREA)

Abstract

L'invention concerne un procédé mis en oeuvre par ordinateur pour la transformation de cartes imprimées en images mémorisées sous forme numérique à format unique. Les images cartographiques mappées par points correspondant à une carte imprimée sont produites par balayage ou autre. Une image cartographique mappée par points est ensuite découpée pour permettre la sélection d'une image cartographique correspondant à une zone géographique voulue, telle qu'une zone divisée en degrés (80). Les frontières de l'image cartographique sélectionnée sont déplacées de sorte que la zone géographique prenne une forme de damier, tel qu'un rectangle. L'image cartographique sélectionnée est ensuite redimensionnée de sorte qu'elle contienne une zone de pixels prédéterminée (82). L'image cartographiée, de format homogène, est ensuite stockée dans un identificateur d'un point de référence et de la taille de la zone géographique (84) représentée par l'image cartographique. Par exemple, l'identificateur (84) peut être le nom d'un fichier lisible par un ordinateur contenant l'image cartographique.
PCT/US1996/010708 1996-06-20 1996-06-20 Procede et appareil pour generer des images cartographiques de format homogene WO1997049027A1 (fr)

Priority Applications (8)

Application Number Priority Date Filing Date Title
PL96330707A PL330707A1 (en) 1996-06-20 1996-06-20 Method of and apparatus for obtaining digital images of maps of uniform format
AU62873/96A AU721447B2 (en) 1996-06-20 1996-06-20 Method and apparatus for generating digital map images of a uniform format
PCT/US1996/010708 WO1997049027A1 (fr) 1996-06-20 1996-06-20 Procede et appareil pour generer des images cartographiques de format homogene
CZ984110A CZ411098A3 (cs) 1996-06-20 1996-06-20 Způsob a zařízení pro generování zobrazení digitálních map v jednotném formátu
CA002258578A CA2258578A1 (fr) 1996-06-20 1996-06-20 Procede et appareil pour generer des images cartographiques de format homogene
JP09506061A JP2000511308A (ja) 1996-06-20 1996-06-20 一定フォーマットのディジタル地図画像を発生する方法及び装置
EP96921734A EP0934561A1 (fr) 1996-06-20 1996-06-20 Procede et appareil pour generer des images cartographiques de format homogene
NO985890A NO985890L (no) 1996-06-20 1998-12-16 FremgangsmÕte og apparat for generering av digitale kartbilder

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PCT/US1996/010708 WO1997049027A1 (fr) 1996-06-20 1996-06-20 Procede et appareil pour generer des images cartographiques de format homogene
CA002258578A CA2258578A1 (fr) 1996-06-20 1996-06-20 Procede et appareil pour generer des images cartographiques de format homogene

Publications (1)

Publication Number Publication Date
WO1997049027A1 true WO1997049027A1 (fr) 1997-12-24

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Application Number Title Priority Date Filing Date
PCT/US1996/010708 WO1997049027A1 (fr) 1996-06-20 1996-06-20 Procede et appareil pour generer des images cartographiques de format homogene

Country Status (6)

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EP (1) EP0934561A1 (fr)
JP (1) JP2000511308A (fr)
AU (1) AU721447B2 (fr)
CA (1) CA2258578A1 (fr)
CZ (1) CZ411098A3 (fr)
WO (1) WO1997049027A1 (fr)

Cited By (4)

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Publication number Priority date Publication date Assignee Title
WO2001073690A3 (fr) * 2000-03-29 2002-03-14 Provar Inc Systeme et procede de georeferenciation de cartes tramees numeriques
US6631326B1 (en) 2000-03-29 2003-10-07 Sourceprose Corporation System and method for performing flood zone certifications
US7038681B2 (en) 2000-03-29 2006-05-02 Sourceprose Corporation System and method for georeferencing maps
US7161604B2 (en) 2000-03-29 2007-01-09 Sourceprose Corporation System and method for synchronizing raster and vector map images

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JP4536422B2 (ja) * 2004-05-21 2010-09-01 株式会社キーエンス 拡大観察装置、拡大画像観察方法、拡大観察用操作プログラムおよびコンピュータで読み取り可能な記録媒体または記録した機器

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US5390292A (en) * 1987-01-26 1995-02-14 Ricoh Company, Ltd. Apparatus for converting a gregory patch
US5341463A (en) * 1990-01-31 1994-08-23 The United States Of America As Represented By The Secretary Of The Navy Selective polygon map display method
US5172102A (en) * 1990-03-16 1992-12-15 Hitachi, Ltd. Graphic display method
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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001073690A3 (fr) * 2000-03-29 2002-03-14 Provar Inc Systeme et procede de georeferenciation de cartes tramees numeriques
US6631326B1 (en) 2000-03-29 2003-10-07 Sourceprose Corporation System and method for performing flood zone certifications
US6678615B2 (en) 2000-03-29 2004-01-13 Sourceprose Corporation System and method for performing flood zone certifications
US6842698B2 (en) 2000-03-29 2005-01-11 Sourceprose Corporation System and method for performing flood zone certifications
US7038681B2 (en) 2000-03-29 2006-05-02 Sourceprose Corporation System and method for georeferencing maps
US7161604B2 (en) 2000-03-29 2007-01-09 Sourceprose Corporation System and method for synchronizing raster and vector map images
US7167187B2 (en) 2000-03-29 2007-01-23 Sourceprose Corporation System and method for georeferencing digital raster maps using a georeferencing function

Also Published As

Publication number Publication date
EP0934561A1 (fr) 1999-08-11
AU721447B2 (en) 2000-07-06
CZ411098A3 (cs) 1999-04-14
AU6287396A (en) 1998-01-07
EP0934561A4 (fr) 1999-08-11
CA2258578A1 (fr) 1997-12-24
JP2000511308A (ja) 2000-08-29

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