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Shape information encoding method and device, shape information decoding method and device and program

A technology of shape information and encoding method, which is applied in the direction of measuring devices, character and pattern recognition, complex mathematical operations, etc., and can solve the problems of low information compression efficiency and incompressible information.

Inactive Publication Date: 2006-04-19
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The problem caused by such short road shape data is that the proportion of information representing the start of the road shape data becomes high, and this information cannot be compressed, so that the overall compression efficiency of the information to be transmitted becomes low

Method used

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  • Shape information encoding method and device, shape information decoding method and device and program
  • Shape information encoding method and device, shape information decoding method and device and program
  • Shape information encoding method and device, shape information decoding method and device and program

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Embodiment Construction

[0058] Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

[0059] Embodiments of the shape information encoding method and device and the shape information decoding method and device according to the present invention are described below as applied to the configuration and operation of an in-vehicle navigation device displaying information transmitted from a traffic information providing system to an in-vehicle Device traffic information.

[0060] First, a method for encoding and compressing shape information such as roads will be described.

[0061] In this embodiment, first, the shape of a road or the like is represented by shape data with statistical deviation. This is because the compression ratio becomes high when shape data is encoded and compressed.

[0062] For example, if figure 1 As shown, when the road shape is represented by the coordinate points (also known as "nodes") arranged on the road, each ...

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Abstract

It is possible to perform highly effective compression even if the information is on a shape indicating a shape such as a road of a short interval, thereby further reducing the data amount. Shape data (11) on a branch line connected to a main line such as a road has a start position (start node P1) on the main line shape data (12) and accordingly, the branch line start position information is expressed by a relative position utilizing the main line shape data. For example, the start position is expressed by [the main line shape data number to be referenced] + [the number of nodes from the main line start end] + [deflection from the direction of the main line shape].

Description

technical field [0001] The present invention relates to a shape information encoding method and device and a shape information decoding method and device when combining shape information such as roads representing map information and information related to events (such as traffic jams and accidents) related to the shape information and information on their positions When sending to a mobile terminal, etc., the method and device are used, for example, in a traffic information providing system, a map information distribution system, and the like. Background technique [0002] In-vehicle navigation devices installed in vehicles to display maps of the current location or its vicinity, traffic information, etc. are becoming increasingly popular, for example, systems using digital map information. The in-car navigation device maintains a digital map database so that it can display a map of the vicinity of the vehicle's own position on the screen based on the latitude and longitude...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09B29/00G01C21/00G01C21/32G08G1/0969
CPCG06K9/00791G01C21/32G09B29/00G01C21/3867G06F17/16G06V20/56
Inventor 足立晋哉池田理映
Owner PANASONIC CORP