Road information providing system and road information providing apparatus and road information generating method
First Claim
1. A road information provision system comprising:
- a road information provision apparatus for providing a state quantity of road information changing along a road as a function of distance from the reference point on said road; and
a road information utilization apparatus for reproducing the road information on said road from said function.
2 Assignments
0 Petitions
Accused Products
Abstract
An object of the invention is to provide a traffic information provision system which can arbitrarily set a position resolution and a traffic representation resolution and flexibly support a traffic information prediction service. The traffic information provision system of the invention quantizes the state quantity of traffic information changing along a road, converts said quantized state quantity to a value having statistical deviation, performs encoding of said value, and provides the encoded value to traffic information utilization apparatus such as a car navigation system. The traffic information utilization apparatus decodes said encoded state quantity to reproduce the traffic information on said road.
35 Citations
39 Claims
-
1. A road information provision system comprising:
-
a road information provision apparatus for providing a state quantity of road information changing along a road as a function of distance from the reference point on said road; and
a road information utilization apparatus for reproducing the road information on said road from said function. - View Dependent Claims (2, 3, 27, 28, 29, 30, 31, 32)
-
-
4. A road information provision system comprising:
-
a road information provision apparatus for sampling a state quantity of road information changing along a road in the direction of distance of said road in intervals corresponding to the position resolution of said road information, quantizing said state quantity at each sampling point in accordance with the traffic representation resolution representing the number of available states of said road information, encoding the obtained value and providing the encoded value; and
a road information utilization apparatus for decoding said encoded value to reproduce the road information on said road. - View Dependent Claims (5, 6, 8)
-
-
7. A road information provision system comprising:
-
a road information provision apparatus for sampling a state quantity of prediction information of road information changing along a road in the direction of distance of said road, quantizing said state quantity at each sampling point, encoding the obtained value and providing the encoded value; and
a road information utilization apparatus for decoding said encoded value to reproduce the prediction information of the road information on said road.
-
-
9. A road information provision system comprising:
-
a road information provision apparatus for sampling a state quantity of road information or prediction information changing along a road in the direction of distance of said road, converting said state quantity at each sampling point to a value having statistical deviation, encoding the obtained value and providing the encoded value; and
a road information utilization apparatus for decoding said encoded value to reproduce the road information or prediction information on said road.
-
-
10. A road information provision system comprising:
-
a road information provision apparatus for sampling a state quantity of road information or prediction information changing along a road in the direction of distance of said road, quantizing said state quantity at each sampling point, converting said state quantity at each sampling point to a value having statistical deviation, encoding the obtained value and providing the encoded value; and
a road information utilization apparatus for decoding said encoded value to reproduce the road information or prediction information on said road. - View Dependent Claims (11, 26)
-
-
12. A road information provision system comprising:
-
a road information provision apparatus for sampling a state quantity of prediction information of road information changing along a road in the direction of distance of said road, representing said state quantity at each sampling point by a difference value from a state quantity at said sampling point in an adjacent time zone, quantizing said difference value, encoding the quantized value and providing the encoded value; and
a road information utilization apparatus for decoding said encoded value to reproduce the prediction information of the road information on said road.
-
-
13. A road information provision system comprising:
-
a road information provision apparatus for sampling a state quantity of road information or prediction information changing along a road in the direction of distance of said road, transforming said state quantity at each sampling point to a coefficient value of a frequency component by way of orthogonal transformation, encoding said coefficient value and providing the encoded value; and
a road information utilization apparatus for decoding said encoded coefficient value to reproduce the road information or prediction information on said road. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
-
-
14. A road information provision system comprising:
-
a road information provision apparatus for sampling a state quantity of prediction information of road information changing along a road in the direction of distance of said road, transforming said state quantity at each sampling point to a coefficient value of a frequency component by way of orthogonal transformation, encoding said coefficient value and providing the encoded value; and
a road information utilization apparatus for decoding said encoded value to reproduce the prediction information of the road information on said road.
-
-
15. A road information provision system comprising:
-
a road information provision apparatus for sampling a state quantity of prediction information of road information changing along a road in the direction of distance of said road, representing said state quantity at each sampling point by a difference value from a state quantity at said sampling point in an adjacent time zone, transforming said state quantity at each sampling point to a coefficient value of a frequency component by way of orthogonal transformation, encoding said coefficient value and providing the encoded value; and
a road information utilization apparatus for decoding said encoded coefficient value to reproduce the prediction information of road information on the road.
-
-
33. A road information generation apparatus comprising:
-
a road information converter for sampling a state quantity of road information changing along a road in the direction of distance of said road in intervals corresponding to the position resolution of said road information and quantizing said state quantity at each sampling point by using a quantization table;
an encoder for encoding, by using an encoding table, the data processed by the road information converter;
a quantization-unit determination unit for determining an interval corresponding to said position resolution in accordance with the state of collection of road information and selecting the quantization table used by the road information converter and the encoding table used by the encoder; and
an information transmitter for transmitting the data encoded by the encoder.
-
-
34. A road information utilization apparatus comprising:
-
an information receiver for receiving road information represented by a function of distance from the reference node of a shape data indicating the road and the data representing said shape data; and
a map matching section for performing map matching by using the data representing the shape data to identify the target road of road information.
-
-
35. A road information generation method comprising the steps of:
-
sampling a state quantity of road information changing along a road in the direction of distance of said road in intervals corresponding to the position resolution of said road information;
quantizing said state quantity at each sampling point in accordance with the traffic representation resolution representing the number of available states of said road information;
converting said state quantity obtained to a value having statistical deviation; and
encoding the obtained value to generate road information.
-
-
36. A road information generation method comprising the steps of:
-
sampling a state quantity of road information changing along a road in the direction of distance of said road in intervals corresponding to the position resolution of said road information;
transforming said state quantity at each sampling point to a coefficient value of a frequency component by way of orthogonal transformation;
quantizing said coefficient value to obtain a value having statistical deviation; and
encoding said post-quantization coefficient value to generate road information.
-
-
37. A program which causes a computer to perform the steps of:
-
determining an interval of sampling of road information and the coarseness of quantization in accordance with the state of collection of road information;
sampling the state quantity of said collected road information in the direction of distance of the road in said intervals;
quantizing said state quantity at each sampling point by using a quantization table corresponding to said coarseness of quantization; and
coding/compressing the quantized value.
-
-
38. A program which causes a computer to perform the steps of:
-
determining an interval of sampling of road information and the coarseness of quantization in accordance with the state of collection of road information;
sampling the state quantity of said collected road information in the direction of distance of the road in said intervals;
performing orthogonal transformation on said state quantity at each sampling point to obtain a coefficient value of a frequency component;
quantizing said coefficient value by using a quantization table corresponding to said coarseness of quantization; and
coding/compressing the quantized value.
-
-
39. A recording medium on which are recorded data of road information on a state quantity of road information changing along a road represented by a function of distance from the reference point on said road and road section reference data for identifying said road.
Specification