Projector Calibration Device Using Imaging Deviation Correction
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Solution Overview
Problem
Existing projection display systems face challenges in recalibrating the relative position between the projection plane and the projection display device over time, as existing methods do not account for sensor deviations, leading to inaccuracies in recalibration.
Innovation Solution
A calibration device and method that uses an imaging device to capture images of feature points on a projection plane and test images, accounting for deviations in both the imaging device and projection display device positions, allowing for accurate recalibration by calculating correction coefficients and geometric correction parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a distance measuring sensor is used to detect relative position deviation, then the projection display device can be recalibrated, but the sensor's own deviation introduces measurement errors
Solution Approach 1:
The patent introduces an imaging device as an intermediary to capture images of the projection plane and test images. This mediator allows the system to indirectly measure deviations by analyzing captured images rather than relying solely on direct sensor measurements, thereby eliminating the sensor's own deviation from the measurement process
Solution Approach 2:
The system creates a visual copy of the projection plane and test images through the imaging device. By capturing and analyzing these image copies, the system can detect deviations without being affected by sensor measurement errors, as the images serve as faithful representations of the actual positions
2Ease of operation
If recalibration is performed using only geometric deviation detection, then the process is simple, but accuracy is compromised due to unaccounted sensor deviations
Solution Approach 1:
The recalibration process is segmented into distinct phases: capturing images of the projection plane, capturing test images, calculating deviation data, correcting position data, and determining correction coefficients. This segmentation maintains operational simplicity while improving accuracy by systematically addressing each measurement component separately
Solution Approach 2:
The system performs preliminary actions by capturing images of the projection plane before capturing test images. This preliminary capture establishes a reference state that is used to correct subsequent measurements, ensuring that sensor deviations are accounted for before final recalibration calculations are made
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Ensures precise recalibration of projection display systems by accounting for sensor deviations, maintaining image alignment and quality over time, similar to initial calibration states.
Implementation Method 1
causes an imaging device to capture an image of a projection plane and obtains from the captured image a first position-data that indicates the set of positions of plural feature points in the projection plane
Data Source
AI summary
After calibration of the projector, the control circuit obtains a first position-data indicating the position of a feature point in the screen and a second position-data indicating the position of a feature point in a test image projected onto the screen. After acquisition of the first position-data and the second position-data, the control circuit obtains a third position-data indicating the position of a feature point in the screen and a fourth position-data indicating the position of a feature point in the test image projected onto the screen. Based on a difference between the first position-data and the third position-data, the control circuit corrects the position of a feature point in the test image contained in the fourth position-data to create a fifth position-data. Based on a difference between the second position-data and the fifth position-data, the control circuit recalibrates the projector.