Rotating Projection Alignment Using Distance and Angle Correction
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Solution Overview
Problem
Existing projection devices struggle to accurately project images across wide-open spaces at wide angles, leading to significant projection errors.
Innovation Solution
A projection device equipped with a projector, angle sensor, rotation driver, distance meter, and controller that performs image correction by measuring distances and angles to accurately project images onto a target position, even in wide-open spaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a projection device projects an image across a wide-open space at a wide projection angle, then the coverage area is improved, but the projection accuracy deteriorates
Solution Approach 1:
The system performs preliminary measurement of the projection surface characteristics (distance, angle, curvature) before projecting the image. The controller uses these pre-measured parameters to pre-calculate and apply correction data to the projection image, ensuring accurate projection even across wide-open spaces at wide angles.
Solution Approach 2:
The system incorporates a measurement device that continuously monitors the projection surface parameters and feeds this information back to the controller. The controller dynamically adjusts the projection image based on this feedback, maintaining high accuracy regardless of the projection angle or distance variations across wide spaces.
2Adaptability or versatility
If the projection angle is increased to cover wider spaces, then the versatility is improved, but the measurement precision deteriorates
Solution Approach 1:
The system introduces a dedicated measurement device as an intermediary between the projection device and the projection surface. This intermediary device specifically measures the projection surface parameters (distance, angle, curvature) with high precision, and the controller uses these precise measurements to compensate for the wide projection angle effects.
Solution Approach 2:
The system dynamically changes projection parameters (such as pixel mapping, distortion correction factors) based on the measured projection surface parameters. When the projection angle varies, the controller adjusts these parameters to maintain measurement and projection precision across different angles and distances.
Data Source
Figure 1
Figure 2A~2B
Figure 2C~2D
AI summary
A projection device (10) according to an aspect of the present invention is a projection device for use at a construction site. The projection device (10) includes: a projector (21) that projects an image onto a projection plane (110); a distance meter (24) that measures a distance to the projection plane (110); a rotation driver (23) that rotates the projector (21) and the distance meter (24); an angle sensor (22) that measures a rotation angle of the rotation driver (23); and a data processor (25a) that corrects the image that is projected from the projector (21). At least one of the distance meter (24) or the projector (21) is offset from a center line of a rotation axis of the rotation driver (23). The data processor (25a) corrects the image by using the distance measured by the distance meter (24) and the rotation angle measured by the angle sensor (22).