Projection Display Obstacle Avoidance via Depth Segmentation
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Solution Overview
Problem
Existing projection technologies face challenges in accurately distinguishing between projected images and actual presenters or obstacles, leading to low accuracy in anti-dazzle functions and unnecessary interruption of projection light, especially when obstacles reflect light differently.
Innovation Solution
A projection display system that includes an image light projecting unit, a distance measurement unit, an obstacle detecting unit, and a projection adjusting unit, which measures distances to the screen, detects obstacles, and adjusts the projection area to avoid obstacles, ensuring accurate and effective anti-dazzle functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If image information is used to detect obstacles, then the detection process is simple, but the accuracy of distinguishing projected images from actual presenters is low
Solution Approach 1:
The patent divides the detection task into two independent parts: depth information acquisition (using infrared distance sensor) and image information acquisition (using image sensor). By segmenting the detection functions, the system achieves high accuracy in distinguishing obstacles from projected images, as each sensor type specializes in one aspect of detection without interference from the other modality.
Solution Approach 2:
The patent introduces depth information as an intermediary parameter that mediates between the infrared sensor data and the final obstacle determination. The control unit uses depth information to weight or filter image information, enabling accurate differentiation between real obstacles and projected images. This intermediary depth data acts as a discriminator that resolves the ambiguity in image-only detection.
2Object-affected harmful factors
If all projection light is cut when an obstacle is detected, then the anti-dazzle effect is strong, but projection at areas not containing the obstacle stops
Solution Approach 1:
The patent applies local quality adjustment by controlling projection light intensity independently in different screen regions. When an obstacle is detected, the system reduces or stops projection light only in the specific area containing the obstacle, while maintaining normal projection in other areas. This localized control achieves the anti-dazzle effect where needed without interrupting the overall presentation.
Solution Approach 2:
The patent implements partial action by applying the anti-dazzle measure (light reduction or stopping) only to the extent necessary - specifically, only to the portions of the projection that would hit the detected obstacle. The projection continues at full intensity in all other areas not containing obstacles, thus achieving the harmful factor reduction without excessive interruption of useful projection.
3Device complexity
If obstacle detection is performed without depth information, then the device complexity is low, but the reliability of obstacle detection is low
Solution Approach 1:
The detection system is segmented into two independent functional modules: an infrared distance sensor for depth information and an image sensor for visual information. This segmentation allows each module to perform its specialized function reliably, with the infrared sensor providing accurate depth data that serves as a reliable indicator for obstacle presence, independent of image processing complexity.
Solution Approach 2:
The control unit is designed with multi-functionality, handling both depth information processing and image information processing, and integrating both data types for final obstacle determination. This universal control mechanism increases detection reliability by combining multiple information sources without requiring separate dedicated control systems for each sensor type.
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
The system provides a highly accurate and effective anti-dazzle function by precisely adjusting the projection to avoid obstacles, preventing eye discomfort for presenters and reducing light reflection, while maintaining projection in areas not affected by the obstacle.
Implementation Method 1
a distance measurement unit that measures distance to the screen
Implementation Method 2
If there is an obstacle that reflects light (such as a PC or a plastic bottle), the light is reflected in a direction different from a projection direction of the projecting unit
Data Source
AI summary
A projection display device including: an image light projecting unit that projects image light on a screen; a distance measurement unit that measures distance to the screen; an obstacle detecting unit that detects an obstacle between the screen and the image light projecting unit on the basis of distance information obtained by the distance measurement unit and, according to a result of this detection, determines an adjustment area where the image light to be projected is to be adjusted; and a projection adjusting unit that adjusts the image light in the adjustment area are included.