Position Information Correction for Pedestrian and Vehicle Differentiation

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Solution Overview

Problem

Existing drive assist systems inaccurately correct the position of mobile objects not on roads, such as pedestrians, to appear as if they are on roads, leading to potential confusion for drivers.

Innovation Solution

A position information correcting device and application program that differentiate between mobile object types based on moving speed and map data, deciding whether to perform position correction, ensuring that pedestrians and other non-vehicle objects are not incorrectly positioned on roads.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If map matching is applied to all mobile objects uniformly, then position information accuracy for vehicles is improved, but position information accuracy for pedestrians and other non-vehicle objects deteriorates

Engineering Contradiction:

Improveposition information accuracyVSAvoidposition information reliability

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent applies different position correction strategies based on mobile object type. For vehicles, map matching is applied to correct positions to the road surface. For pedestrians and other non-vehicle objects, map matching is not applied, allowing their positions to remain as detected without being incorrectly forced onto roads. This local differentiation resolves the contradiction by tailoring the correction approach to the specific characteristics of each object type.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent changes the correction parameter (whether to apply map matching) based on the mobile object type parameter. By identifying the object type first, the system dynamically adjusts the position correction behavior, applying correction only when appropriate for the specific object category, thus maintaining accuracy for vehicles while preserving reliability for pedestrians.

Inventive Principle:

Principle #35Parameter changes

2Loss of information

If position correction is performed for all mobile objects, then position information completeness is improved, but position information accuracy deteriorates due to erroneous corrections

Engineering Contradiction:

Improveposition information completenessVSAvoidposition information accuracy

Core Design Contradiction:

Loss of informationVSMeasurement precision

Solution Approach 1:

The patent implements selective position correction based on mobile object type. Instead of uniformly correcting all objects, it applies correction only to vehicles while leaving pedestrians and other objects uncorrected. This selective approach maintains completeness of position information for all objects while preventing accuracy degradation from erroneous corrections.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

Rather than applying correction universally and then filtering errors, the patent inverts the approach by first identifying object types and then applying correction only where appropriate. This preventive strategy avoids the generation of erroneous corrected positions in the first place, maintaining both completeness and accuracy.

Inventive Principle:

Principle #13The other way round (Inversion)

3Stability of the object's composition

If map matching is applied to pedestrians, then position information consistency with road network is improved, but position information truthfulness deteriorates

Engineering Contradiction:

Improveposition information consistencyVSAvoidposition information truthfulness

Core Design Contradiction:

Stability of the object's compositionVSMeasurement precision

Solution Approach 1:

The patent applies different position handling rules to different object types. For pedestrians, it maintains their detected positions without map matching correction, preserving the truthfulness of their actual locations even if they appear inconsistent with the road network. For vehicles, it applies correction to ensure consistency with road networks. This local differentiation resolves the contradiction between consistency and truthfulness.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS9897453B2Position information correcting device and position information correcting application program product

Publication Date: 2018.02.20 DENSO CORP

AI summary

A position information correcting device includes a reception processing unit receiving position information transmitted from a nearby mobile object, a position correcting unit performing a position correcting process for correcting, based on map data, the position information of the nearby mobile object such that a corrected position of the nearby mobile object is on a running area of a road, a nearby mobile object type acquiring unit acquiring a mobile object type of the nearby mobile object, and a correction performance determining unit determining, based on the mobile object type acquired by the nearby mobile object type acquiring unit, whether the position correcting process needs to be performed to the position information of the nearby mobile object. The position correcting process is performed to the position information of the nearby mobile object only when the correction performance determining unit determines that the position correcting process needs to be performed.