Recursive Reflector Positioning in Projection Systems
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing projector systems face difficulties in identifying the position of a recursive reflector due to failed light reflection into the imaging section, leading to inaccurate determination of the projection area, especially when the positions of the projection and imaging sections are not optimally aligned.
Innovation Solution
The system projects a guide image and an object detecting image at different times, with the imaging section generating data to identify the recursive reflector's position, and adjusts the projection area based on this data, ensuring a contrast ratio between the reflector and its periphery is maintained at or above a predetermined value to enhance visibility and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the projection section and imaging section are positioned at arbitrary locations, then the device structure is flexible and easy to install, but the reflected light from the recursive reflector may fail to enter the imaging section, making it impossible to identify the reflector position
Solution Approach 1:
The patent applies parameter changes by optimizing the angular relationship between the projection section and imaging section. Specifically, it sets the angle between the projection optical axis and imaging optical axis within a predetermined range (0° to 10°), and controls the incident angle of light on the recursive reflector to be within -10° to +10°. These parameter adjustments ensure that reflected light enters the imaging section while maintaining installation flexibility.
Solution Approach 2:
The patent applies local quality by creating a specific first area on the projection surface with different optical properties. This area is designed to provide sufficient contrast ratio (equal to or higher than a predetermined value) between the recursive reflector and its periphery, enabling reliable position identification. The local optimization of this first area ensures that the reflector position can be accurately identified without requiring perfect alignment across the entire projection surface.
2Stability of the object's composition
If the contrast ratio between the recursive reflector and its periphery is low, then the projection surface can maintain uniform appearance, but the imaging data fails to clearly represent the recursive reflector, making position identification difficult
Solution Approach 1:
The patent applies parameter changes by optimizing the contrast ratio parameter. It requires that the contrast ratio between the recursive reflector and the periphery of the recursive reflector in the imaging data be equal to or higher than a predetermined value. This parameter adjustment ensures that the reflector position can be clearly identified in the imaging data while maintaining the overall uniformity of the projection surface during normal operation.
Solution Approach 2:
The patent applies preliminary action by pre-defining the first area on the projection surface where the recursive reflector will be located. This area is prepared in advance with specific optical characteristics that ensure sufficient contrast ratio. By preparing this area beforehand, the system ensures that when the recursive reflector is positioned there, its location will be clearly detectable in the imaging data without requiring post-processing adjustments.
3Ease of operation
If the imaging section images the projection surface without optimal alignment, then the system can operate with relaxed positioning requirements, but the imaging data does not accurately represent the recursive reflector position
Solution Approach 1:
The patent applies parameter changes by establishing specific angular parameter ranges that balance ease of operation with measurement precision. It sets the angle between the projection optical axis and imaging optical axis within 0° to 10°, and controls the incident angle within -10° to +10°. These parameter ranges are wide enough to accommodate relaxed positioning requirements but narrow enough to ensure accurate reflector position identification and projection area determination.
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 allows for reliable identification and positioning of the recursive reflector, ensuring accurate projection area determination and improved image projection quality by maintaining a sufficient contrast ratio, regardless of the reflector's location on the projection surface.
Implementation Method 1
a projection device configured to project a first image and a second image at respective timings different from each other
Implementation Method 2
an imaging device configured to image a first projection area in a situation in which the projection device projects the first image in the first projection area including the first area
Implementation Method 3
a recursive reflector located in a first area of a projection surface
Data Source
AI summary
A projection system includes a recursive reflector located in a first area of a projection surface, a projection device configured to project a first image and a second image at respective timings different from each other, an imaging device configured to image a first projection area in a situation in which the projection device projects the first image in the first projection area including the first area to thereby generate imaging data, and a control device configured to identify a position of the recursive reflector based on the imaging data, and decide a second projection area in which the second image is projected based on the position of the recursive reflector, wherein the projection device and the imaging device are disposed so that a contrast ratio between the recursive reflector and a periphery of the recursive reflector becomes equal to or higher than a predetermined value.