Projection Image Position Adjustment via Test Pattern Detection
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Solution Overview
Problem
Existing projection systems face difficulties in accurately adjusting the image projection position to align with the edges of a screen without causing the image to extend beyond the screen boundaries, especially when using lens shift functions or light modulators like liquid crystal panels.
Innovation Solution
A method and apparatus that project a test pattern around the image, capture changes in the test pattern, and adjust the image movement speed and direction to prevent the image from exceeding the screen edges, using a combination of a projector, imager, detector, and controller to determine when the image has reached the screen limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the lens shift function is used to move the projection image at a fixed speed, then the adjustment operation is simple, but the image may extend beyond the screen boundaries making precise positioning difficult
Solution Approach 1:
The system captures images of the projection image at multiple positions and detects changes in the test pattern to determine when the image reaches the screen boundaries. This feedback mechanism allows the system to automatically adjust the projection position with high precision while maintaining simple operation through automated boundary detection and speed control.
Solution Approach 2:
The system dynamically adjusts the moving speed of the projection image during the lens shift operation. By changing from a fixed speed to a variable speed that slows down near boundaries, the system achieves both easy operation and precise positioning, resolving the contradiction between operational simplicity and positioning accuracy.
2Productivity
If the projection image is moved quickly to reach the screen end, then the adjustment time is reduced, but the image may overflow the screen boundaries
Solution Approach 1:
The system employs dynamic speed control where the projection image moves quickly during most of the adjustment range to maintain high productivity, then automatically slows down when approaching the screen boundaries to ensure precise positioning and prevent overflow, thus resolving the contradiction between adjustment speed and positioning precision.
Solution Approach 2:
Through continuous capture and analysis of test pattern changes, the system provides real-time feedback on the projection image position relative to screen boundaries. This enables the system to maintain high-speed movement when far from boundaries while automatically reducing speed near boundaries, achieving both high productivity and precision.
3Adaptability or versatility
If the lens shift mechanism is added to enable image position adjustment, then the projection position flexibility is improved, but the device complexity increases
Solution Approach 1:
The projection apparatus integrates multiple functions including the lens shift mechanism for position adjustment, an imaging device for capturing the projection image, and a control system for automated boundary detection. This multi-functional integration provides projection position flexibility while managing device complexity through coordinated operation of these components.
Solution Approach 2:
The system uses its own imaging device to capture and analyze the projection image for boundary detection, eliminating the need for external detection devices. This self-service approach provides projection position flexibility while minimizing the increase in device complexity by utilizing existing components for multiple purposes.
Data Source
AI summary
A projection image including a test pattern is projected on a projection surface. The projection image is moved in a first direction. An image of the projection image is captured. A change in the test pattern contained in the projection image the image of which has been captured is detected. When a change in the test pattern is detected, it is determined that the projection image has reached an end of the projection surface.