Projector System Stereographic Projection Wide Detection
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Solution Overview
Problem
Existing interactive projector systems face challenges in detecting pointing elements over a wide range and maintaining accurate positioning, especially when the attitude of the pointing element changes, due to distortion and reduced image size at the periphery, leading to potential false or unsuccessful detection.
Innovation Solution
A projector system employing a stereographic projection scheme with an imager that captures a wide-angle view, including a region from the projection area to a plane in front, using two cameras to acquire parallax information and a projector controller to associate image projection positions with pointing element positions, allowing reliable detection and interactive image projection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If an imaging apparatus with a wide angle of view is used to detect pointing elements over a wide range, then the detection range is improved, but the pointing element becomes distorted and reduced in size at the periphery, leading to false or unsuccessful detection
Solution Approach 1:
The patent changes the projection parameter from conventional equidistant projection to stereographic projection. This parameter change in the imaging model allows the imaging apparatus to maintain accurate representation of the pointing element across the entire wide detection range, preventing distortion and size reduction at the periphery while still achieving wide-angle coverage.
2Area of stationary object
If the detection range is widened to capture the projection region and surrounding area, then the coverage is improved, but it becomes difficult to perform detection in the peripheral region of the detection range
Solution Approach 1:
By changing the projection parameter to stereographic projection, the system maintains reliable detection capability across the entire expanded detection range. The stereographic projection model ensures that pointing elements in peripheral regions are not distorted or reduced in size, thereby maintaining detection reliability throughout the wide detection range including both central and peripheral regions.
3Measurement precision
If a light output apparatus that radiates laser light is used to achieve interactive function, then the pointing detection capability is improved, but the device complexity and positioning precision requirements increase
Solution Approach 1:
The patent extracts and removes the separate light output apparatus (laser device) from the system. By using the imaging apparatus with stereographic projection to directly detect the pointing element in the projection region, the system eliminates the need for additional laser radiation equipment, thereby reducing device complexity while maintaining or improving pointing detection precision.
Solution Approach 2:
The imaging apparatus is designed to serve multiple functions: it both projects the image light and detects the pointing element. This multi-functionality eliminates the need for separate detection equipment, reducing system complexity while maintaining detection precision through the stereographic projection capability.
Data Source
AI summary
A projector system includes a projector main body that obliquely projects image light and an imager that operates based on a stereographic projection scheme and captures an image of a stereographic region containing a projection region where the image light from the projector main body is projected to detect a pointing element present in the stereographic region.