Projection Mapping Coordinate Transformation for Positioning Accuracy

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Solution Overview

Problem

Conventional methods for setting projection images in projection mapping struggle to accurately set and adjust the shape and position of display areas in the camera coordinate system, leading to potential shifts and inaccuracies due to low correspondence accuracy between projector and camera coordinate systems.

Innovation Solution

An information generation method and system that identifies the correspondence relationship between projector and camera coordinate systems using measurement patterns, allowing for the transformation and adjustment of display areas between these systems, enabling accurate positioning and shaping of projection objects.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If coordinate transformation is performed between projector and camera coordinate systems, then positioning accuracy of projection objects is improved, but system complexity increases due to requiring correspondence identification and coordinate transformation processes

Engineering Contradiction:

Improvepositioning accuracyVSAvoidsystem complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent performs preliminary identification of the correspondence relationship between projector and camera coordinate systems before actual projection object placement. By pre-establishing the coordinate transformation matrix through measurement patterns, the system eliminates the need for complex real-time calculations during operation, thus improving positioning accuracy while managing system complexity through advance preparation

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent introduces a coordinate transformation matrix as an intermediary element that bridges the projector coordinate system and camera coordinate system. This matrix serves as a mediator that enables accurate coordinate conversion without requiring direct complex interactions between the two coordinate systems, thus improving positioning accuracy while maintaining manageable system complexity

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If display area is designated in camera coordinate system, then ease of visual confirmation is improved, but positioning accuracy deteriorates due to transformation errors

Engineering Contradiction:

Improveease of visual confirmationVSAvoidpositioning accuracy

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The patent implements a feedback mechanism where the system displays the transformed display area back in the original coordinate system context, allowing users to visually confirm the position while the system simultaneously maintains the accurate transformed coordinates for actual projection. This feedback loop enables users to benefit from intuitive visual confirmation while the system compensates for any transformation errors through the established correspondence relationship

Inventive Principle:

Principle #23Feedback

3Measurement precision

If coordinate correspondence identification is performed using measurement patterns, then positioning precision is improved, but time consumption increases due to additional imaging and processing steps

Engineering Contradiction:

Improvepositioning precisionVSAvoidtime consumption

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent performs the time-consuming measurement pattern imaging and correspondence identification as a preliminary setup process before actual projection operations. By completing the coordinate system calibration in advance, the system accepts the time investment during setup in exchange for high positioning precision during subsequent projection operations, eliminating the need for repeated measurements

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent uses measurement patterns that can be repeatedly copied and projected onto the projection target. These standardized patterns enable efficient correspondence identification through template matching and feature recognition, reducing the time required for analysis while maintaining high positioning precision through accurate pattern recognition

Inventive Principle:

Principle #26Copying

Data Source

PatentUS11616935B2Information generation method, information generation system, and non-transitory computer-readable storage medium storing program

Publication Date: 2023.03.28 SEIKO EPSON CORP

AI summary

There is provided an information generation method including, identifying a correspondence relationship between a projector coordinate system and a camera coordinate system, receiving a first operation of designating a first display area representing an arrangement destination of a projection object which is projected on a projection target in a first coordinate system which is one of the camera coordinate system or the projector coordinate system, transforming the first display area into a second display area representing an arrangement destination of the projection object in a second coordinate system which is another of the camera coordinate system or the projector coordinate system based on the correspondence relationship, receiving a second operation of changing at least one of a shape or a position of the second display area, and generating information for changing at least one of a shape or a position of the projection object in accordance with the second operation.