3D Projection Positioning via Depth-Aware Coordinate Transformation
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Solution Overview
Problem
Existing projection technologies fail to accurately project objects at desired three-dimensional positions on three-dimensional projection targets due to changes in object position and lack of depth information consideration in keystone correction, leading to inaccurate drawing placement and shape.
Innovation Solution
A method that involves obtaining a first image of the projection target, converting user-drawn two-dimensional object information into three-dimensional object information based on relative position and posture information between the camera and projector, and then projecting the object onto the target using a processing device and projector, ensuring accurate three-dimensional positioning and shape representation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If keystone correction is used to obtain correspondence relation between projector image and camera image, then the projection area can be corrected for perspective distortion, but depth information is not considered leading to inaccurate three-dimensional position projection on three-dimensional targets
Solution Approach 1:
The patent transitions from two-dimensional keystone correction to three-dimensional coordinate transformation by introducing depth information through camera imaging. The system establishes a three-dimensional coordinate system that incorporates Z-axis depth data, enabling accurate mapping of drawing objects onto three-dimensional projection targets while considering spatial depth relationships.
Solution Approach 2:
The patent introduces a camera as an intermediary device to capture the projection target and provide depth information. The camera coordinate system serves as a mediator between the projector and the three-dimensional target, enabling accurate position conversion by incorporating real depth data from the imaged target.
2Adaptability or versatility
If correspondence relation is established between camera and projector coordinate systems, then drawing objects can be projected, but when object position moves after calibration the correspondence relation changes making accurate projection unachievable
Solution Approach 1:
The patent implements dynamic coordinate transformation that automatically adapts when the projection target moves. The system continuously maintains the correspondence relation between camera and projector coordinate systems by recalculating transformation matrices based on the current target position, enabling accurate projection even when the target is repositioned after calibration.
3Device complexity
If simple two-dimensional coordinate conversion is used, then the projection process is simple, but the drawing object cannot be accurately projected at the desired three-dimensional position on the projection target
Solution Approach 1:
The patent extends simple two-dimensional coordinate conversion to three-dimensional coordinate transformation by incorporating depth information from camera imaging. The transformation process now operates in 3D space, accurately mapping drawing objects to their corresponding three-dimensional positions on the projection target while maintaining reasonable computational complexity.
Data Source
AI summary
A projection method includes, obtaining a first image obtained by imaging a projection target with a camera, receiving an operation of a user drawing a drawing object in the first image, generating first object information representing a two-dimensional position of the drawing object in the first image, converting the first object information into second object information, converting the second object information into third object information representing a position of the drawing object on an image to be projected from a projector based on second position information representing a relative three-dimensional position between the projector and the projection target and second posture information representing an orientation of an optical axis of the projector, and projecting a projection image including the drawing object on the projection target from the projector.