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Traffic information providing system, a traffic information expressing method and device

A technology of traffic information and device pairing, applied in traffic control systems, traffic control systems for road vehicles, arrangement of variable traffic indications, etc., can solve problems such as no corresponding congestion levels

Inactive Publication Date: 2006-09-20
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, in the case of simple averaging of the velocity values, the obtained value does not correspond to the level of congestion actually experienced by the driver

Method used

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  • Traffic information providing system, a traffic information expressing method and device
  • Traffic information providing system, a traffic information expressing method and device
  • Traffic information providing system, a traffic information expressing method and device

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0178]

[0179] By utilizing discrete wavelet transform (DWT) employed as a system for compressing image data or voice data, the present invention compresses traffic information state quantities that vary along roads (FIG. 41B).

[0180] DWT can utilize various filters. The following describes the case of a DWT 2x2 filter (a filter that generates a single wavelet coefficient from two inputs and a single scale coefficient from two inputs). The 2×2 filter thins out half of the sampled data so that the number of data items is 2 N multiples of .

[0181] Figure 1 shows the general expression of DWT.

[0182] A wavelet refers to a function obtained by multiplying a (scaling operation) on the time axis for a function Ψ(t) (called a base wavelet, which exists in a range in terms of time and frequency), and shifting b in terms of time such as (expression 3) Wait for a set of functions. By using this function, it is possible to extract the frequency and time components of the sig...

no. 2 approach

[0276] Regarding the second embodiment of the present invention, a system for performing bit-plane decomposition in data transmission is described.

[0277] Bit planes are broken down into coding systems used to compress images. By utilizing this system, the recipient can acquire coarse data at an early stage, for example in a progressive mode of the image.

[0278] For example, when sending a string of numbers (10, 1, 3, -7), the numbers are represented by binary digits, as shown in Figure 30:

[0279] 10=1010

[0280] 1 = 0001

[0281] 3 = 0011

[0282] -7=0-111

[0283] Typically the string of numbers "1010 0001 0011 0-111" is sent. In the bit plane decomposition, as shown in FIG. 30 , the number string "1000 000-1 1011 0111" is transmitted in the following order: MSB, second bit, third bit, and LSB of each number.

[0284] The receiver recognizes that the string was sent when it receives "1000"

[0285] 1000=8

[0286] 0000=0

[0287] 0000=0

[0288] 0000=0.

[...

no. 3 approach

[0317] Although the first and second embodiments of the present invention relate to the case where a traffic information providing device as a center provides traffic information to a traffic information utilizing device (such as an in-vehicle device), the traffic information providing method of the present invention can also be used In a system in which an on-board device on a probe car that provides trip data serves as a traffic information providing device, and a center that collects information from the probe car serves as a traffic information utilization device. The system is described below for a third embodiment of the present invention.

[0318] As shown in FIG. 33 , the system includes: a vehicle-mounted machine 90 used to measure and provide travel data; and a vehicle collection system 80 used to collect data. The probe car vehicle-mounted machine 90 comprises: code list receiver 94, is used for receiving the code list that is used for encoding and sending data from...

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PUM

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Abstract

A traffic information providing system wherein even in any different traffic environment, traffic information expressed in any degree of detail can be compressed to a data amount in accordance with such a different traffic environment. The system includes a traffic information providing device (30) that comprises means (33) for producing sampling data from traffic information expressed by a function of distance from a reference position on a load and by a function of time, and means (34) for subjecting the sampling data to a discrete wavelet transformation to transform the traffic information to a scaling coefficient and a wavelet coefficient. The system also includes a traffic information utilizing device (60) that subjects the scaling coefficient and wavelet coefficient received from the traffic information providing device (30) to an inverse discrete wavelet transformation to reconstruct the traffic information. Even when the traffic information providing device (30) provides the scaling coefficient and wavelet coefficient without awareness of the traffic environment and reception status, the receiving side can reconstruct general and detailed information within a range of the received information.

Description

technical field [0001] The present invention relates to a method for providing traffic information such as congestion and travel time, a system for implementing the method, and devices constituting the system, and in particular to methods and systems for facilitating the recovery of traffic information at the receiving side with equipment. [0002] The present invention also provides a method for providing traffic information, a system and equipment for realizing the method, and especially relates to a method, system and equipment for providing correct speed information of traffic flow. Background technique [0003] Currently, VICS (Vehicle Information and Communication System), which provides a traffic information provision system for car navigation systems, collects and edits traffic information, and transmits traffic jam information and Travel time information representing the required time. [0004] The current VICS information represents the current traffic informatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08G1/00G08G1/09
Inventor 足立晋哉池田理映
Owner PANASONIC CORP
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