Projection System Geometric Distortion Correction on 3D Targets
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Solution Overview
Problem
Conventional techniques struggle to accurately correct geometric distortion of projected images when a complicated three-dimensional shape is used as the projection target, especially when the user's viewpoint is not fixed, due to difficulties in precisely specifying the viewpoint position.
Innovation Solution
A projection system comprising a projection unit, a three-dimensional shape measurement unit, and an imaging unit that performs two-phase adjustment (coarse and precise adjustment) to correct geometric distortion, using test images and three-dimensional shape data to minimize distortion regardless of the user's viewpoint position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional geometric correction techniques are used assuming a flat screen, then correction is simple and effective for flat surfaces, but geometric distortion cannot be properly corrected when a complicated three-dimensional shape is set as the projection target
Solution Approach 1:
The patent applies dynamics by making the correction method adaptable to different projection target shapes. The system dynamically switches between conventional correction (for flat surfaces) and three-dimensional correction (for complicated shapes) based on the detected geometry of the projection target, enabling the correction mechanism to adjust its behavior according to the specific application scenario
Solution Approach 2:
The patent changes the correction parameters based on the projection target characteristics. When a complicated three-dimensional shape is detected, the system transitions from using simple flat-screen correction parameters to employing three-dimensional geometric correction parameters that account for depth and surface curvature, thereby improving correction accuracy for 3D targets
2Manufacturing precision
If three-dimensional shape data is obtained by measuring the projection target to perform correction processing, then geometric distortion correction improves for three-dimensional targets, but it becomes necessary to accurately specify the viewpoint position of the user
Solution Approach 1:
The patent applies self-service by enabling the system to automatically detect and adapt to the user's viewpoint position without requiring manual specification. The viewpoint detection unit automatically captures images from different positions and calculates the optimal viewpoint, allowing the correction system to serve itself by eliminating the need for user intervention in viewpoint specification
Solution Approach 2:
The patent replaces the mechanical/manual viewpoint specification process with an automated image-based detection system. Instead of requiring users to manually input or specify viewpoint coordinates, the system uses imaging units to capture visual information and computationally determine the viewpoint position, substituting mechanical interaction with optical-digital detection
3Ease of operation
If the viewpoint position of the user is not fixed, then user flexibility is maintained, but it is difficult to accurately specify the viewpoint position of the user at all times
Solution Approach 1:
The patent implements feedback by continuously monitoring the user's viewpoint position through image capture and using this information to adjust the geometric correction in real-time. The system captures images from the user's actual viewpoint, calculates the corresponding correction parameters, and applies them dynamically, creating a closed-loop system that maintains both flexibility and precision
Solution Approach 2:
The patent performs preliminary action by pre-calculating and storing correction data for multiple possible viewpoint positions. When the user views the projection from any position, the system can quickly retrieve and apply the appropriate pre-computed correction parameters, eliminating the need for real-time calculation while maintaining accuracy for moving viewpoints
Data Source
AI summary
Provided is a projection system that sets an arbitrary three-dimensional shape as a projection target and properly corrects geometric distortion of a projected image even when a user's viewpoint is not fixed. A projection unit of the projector apparatus projects a test image for first adjustment. A three-dimensional shape measurement unit measures the three-dimensional shape of the projection target. An image capturing apparatus captures the test image for first adjustment projected by the projection unit to obtain a captured image for first adjustment. A projected image adjustment unit (1) performs first adjustment processing for correcting an image such that geometric image distortion viewed from an imaging point, at which the captured image for first adjustment has been captured, is reduced, based on a captured image for first adjustment obtained by the image capturing apparatus, and (2) performs second adjustment processing for correcting the image such that the geometric image distortion is reduced based on a state in which the image adjusted by the first adjustment processing is projected by the projection unit.