Multi-Projector Display Bright Point Detection
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Solution Overview
Problem
In display systems with multiple interactive projectors, overlapping light curtains can cause defects such as doubly drawn or jagged lines when a pointer crosses the boundaries, degrading temporal resolution for pointer detection.
Innovation Solution
A method that involves a camera capturing images of a display surface, detecting bright points from reflected lights radiated by adjacent projectors, and determining a single display position based on the proximity of these points, ensuring a smooth drawn line without degrading temporal resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple interactive projectors are arranged in line to display on a larger surface, then the display area is increased, but the light curtains of adjacent projectors overlap causing detection defects
Solution Approach 1:
The system divides the detection task by assigning different detection responsibilities to each projector. Each projector detects pointers only within its own light curtain region, avoiding detection conflicts in overlapping areas while maintaining comprehensive coverage of the entire display surface.
Solution Approach 2:
The system introduces an intermediary mechanism (detection result sharing and coordinate transformation) between adjacent projectors. When a pointer is detected near a boundary, the detection results are shared with adjacent projectors through coordinate transformation, allowing seamless integration without direct interference in the overlapping light curtain regions.
2Reliability
If radiation timing of light curtains is varied on the time axis to avoid double bright points, then detection defects are reduced, but temporal resolution for pointer detection is degraded
Solution Approach 1:
Instead of resolving the timing conflict in the time dimension (by staggering radiation timing), the system moves to the spatial dimension. Each projector independently detects pointers in its own spatial region simultaneously, eliminating timing conflicts while maintaining high temporal resolution. The coordinate transformation mechanism then integrates these spatially-separated detections.
3Quantity of substance
If a single projector detects pointers in overlapping light curtain regions, then two bright points are imaged for one pointer, but drawn lines become doubly drawn or jagged
Solution Approach 1:
The system segments the detection responsibility by light curtain region. Each projector is assigned to detect pointers only within its own light curtain boundaries, preventing the imaging of multiple bright points for a single pointer. This spatial segmentation eliminates the root cause of doubly drawn or jagged lines while maintaining complete coverage through coordinated operation of multiple projectors.
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
This approach prevents the defect of doubly drawn lines while maintaining high temporal resolution for pointer detection, even when bright points from adjacent projectors overlap, by determining a single display position for overlapping bright points.
Implementation Method 1
detecting a first bright point corresponding to a reflected light of a first light radiated substantially parallel to the display surface
Data Source
AI summary
A projector includes a first acquisition unit, a detection unit, a second acquisition unit, and a display control unit. The first acquisition unit acquires a captured image of a range containing a display surface by a camera. The detection unit detects a first bright point and a second bright point corresponding to reflected lights of a first light and a second light radiated substantially parallel to the display surface by a pointer from the captured image. When a distance between a position of the first bright point and a position of the second bright point is less than a first threshold, the second acquisition unit acquires a third position determined based on the first bright point and the second bright point. The display control unit displays a display image containing a drawn image by the pointer in the third position.