Traffic information providing system, a traffic information expressing method and device
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Accused Products
Abstract
The invention has as an object to provide a traffic information providing system capable of compressing traffic information represented at an arbitrary detail level to a data volume corresponding to a different communications environment. The traffic information providing system includes: traffic information providing apparatus including means for generating sampling data from traffic information represented by a function of distance from a reference position on a road or a function of time and means for performing discrete wavelet transform on the sampling data to convert the traffic information to scaling coefficients and wavelet coefficients; and traffic information utilization apparatus for performing inverse wavelet transform on the scaling coefficients and wavelet coefficients received from the traffic information providing apparatus to restore the traffic information. The receiving party can restore coarse or minute information within the range of the received information even in case the traffic information providing apparatus has provided scaling coefficients and wavelet coefficients without considering the communications environment and reception state.
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Citations
83 Claims
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1-31. -31. (canceled)
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32. A traffic information providing method comprising:
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performing discrete wavelet transform on traffic information represented by a function of distance from a reference position on a road to convert the traffic information to scaling coefficients and wavelet coefficients; and
providing the resulting information. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39, 40)
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41. A traffic information providing method comprising:
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performing discrete wavelet transform on traffic information represented by a function of time to convert the traffic information to scaling coefficients and wavelet coefficients; and
providing the resulting information. - View Dependent Claims (42, 43, 44, 45, 46, 47, 48, 49, 50)
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51. A traffic information providing system comprising:
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a traffic information providing apparatus for generating sampling data from traffic information represented by a function of distance from a reference position on a road, performing one or more discrete wavelet transform processes on the sampling data to convert the traffic information to scaling coefficients and wavelet coefficients, and providing the coefficients; and
a traffic information utilization apparatus for performing one or more inverse discrete wavelet transform processes on the scaling coefficients and wavelet coefficients received from the traffic information providing apparatus to restore the traffic information. - View Dependent Claims (52, 53, 54, 55, 56, 57)
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58. A traffic information providing system comprising:
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a traffic information providing apparatus for using traffic information measured at a fixed time pitch as sampling data, performing one or more discrete wavelet transform processes on the sampling data to convert the traffic information to scaling coefficients and wavelet coefficients, and providing the coefficients; and
a traffic information utilization apparatus for performing one or more inverse discrete wavelet transform processes on the scaling coefficients and wavelet coefficients received from the traffic information providing apparatus to restore the traffic information. - View Dependent Claims (59, 60, 61, 62, 63, 64)
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65. A traffic information providing apparatus comprising:
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traffic information conversion means for generating sampling data from the collected traffic information data;
traffic information encoding means for performing one or more discrete wavelet transform processes on the sampling data to convert the traffic information to scaling coefficients and wavelet coefficients; and
traffic information transmission means for transmitting the scaling coefficients earlier than the wavelet coefficients and transmitting, among the wavelet coefficients, high-order wavelet coefficients earlier than low-order wavelet coefficients. - View Dependent Claims (66, 67)
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68. Traffic information utilization apparatus comprising:
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traffic information reception means for receiving from a traffic information providing apparatus road section reference data representing a target road of traffic information and scaling coefficients and wavelet coefficients as traffic information;
target road determination means for identifying the target road of the traffic information by using the road section reference data; and
traffic information decoding means for performing one or more inverse discrete wavelet transform processes on the scaling coefficients and wavelet coefficients in order to restore the traffic information. - View Dependent Claims (69, 70)
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71. A traffic information providing method comprising:
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performing discrete wavelet transform on a reciprocal of speed information represented by a function of distance from a reference position on a road to convert the reciprocal of the speed information to scaling coefficients and wavelet coefficients; and
providing the coefficients. - View Dependent Claims (72, 73, 74, 75, 76)
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77. A traffic information providing system comprising:
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traffic information providing apparatus for generating sampling data from speed information represented by a function of distance from a reference position on a road, performing one or more discrete wavelet transform processes on the reciprocal of the sampling data to convert the reciprocal of the speed information to scaling coefficients and wavelet coefficients, and providing the coefficients; and
traffic information utilization apparatus for performing one or more inverse discrete wavelet transform processes on the scaling coefficients and wavelet coefficients received from the traffic information providing apparatus, converting the obtained value to its reciprocal, and restoring the speed information. - View Dependent Claims (78, 79, 80, 81)
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82. A traffic information providing apparatus comprising:
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traffic information conversion means for generating 2N sampling data items or a multiple of the 2N sampling data items from collected speed information data;
traffic information encoding means for performing one or more discrete wavelet transform processes on reciprocals of the sampling data to convert the reciprocals to scaling coefficients and wavelet coefficients; and
traffic information transmission means for transmitting the scaling coefficients earlier than the wavelet coefficients and transmitting, among the wavelet coefficients, high-order wavelet coefficients earlier than low-order wavelet coefficients.
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83. A traffic information utilization apparatus comprising:
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traffic information reception means for receiving from a traffic information providing apparatus a road section reference data representing a target road of traffic information and scaling coefficients and wavelet coefficients as traffic information;
target road determination means for identifying the target road of the traffic information by using the road section reference data; and
traffic information decoding means for performing one or more inverse discrete wavelet transform processes on the scaling coefficients and wavelet coefficients, converting an obtained value to reciprocals, and restoring the speed information.
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Specification