Automatic Focusing Projection System with Depth Sensing
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Solution Overview
Problem
Current motion projection systems, particularly those with reflective motion, lack an effective real-time automatic focusing scheme, leading to blurring issues due to varying projection distances.
Innovation Solution
An automatic focusing projection method and system that includes a ranging unit for depth image acquisition, a projection unit with a movable focusing device, and a reflection unit to adjust light direction, utilizing a control unit to calculate and adjust the projection distance for precise focus adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed-focus scheme is employed in a motion projection system, then the device complexity is reduced, but the projection picture quality deteriorates due to blurring when projection distance varies
Solution Approach 1:
The patent implements dynamic focusing by making the projection lens movable along the optical axis through a focusing device. The lens position is adjusted in real-time based on the projection distance to maintain clear focus during motion projection. This transforms the static fixed-focus system into a dynamic adjustable system, resolving the contradiction between device simplicity and image quality.
2Manufacturing precision
If real-time automatic focusing is implemented in a reflective motion projection system, then the projection picture quality is maintained, but the device complexity increases due to additional focusing mechanisms
Solution Approach 1:
The patent employs a feedback mechanism where a ranging unit continuously measures the projection distance, and the control unit processes this information to automatically adjust the lens position through the focusing device. This closed-loop feedback system enables real-time automatic focusing, maintaining image quality while managing complexity through intelligent control rather than purely mechanical solutions.
Solution Approach 2:
The patent replaces complex mechanical focusing mechanisms with an integrated control system that uses ranging data and computational algorithms to determine lens positioning. The control unit processes ranging information and generates control signals for the focusing device, substituting pure mechanical complexity with a hybrid of optical measurement, computational processing, and controlled actuation.
3Adaptability or versatility
If the projection position constantly varies in a motion projection system, then the adaptability and versatility are improved, but the focusing accuracy deteriorates due to varying projection distances
Solution Approach 1:
The patent implements preliminary action by having the ranging unit continuously measure the projection distance before and during the projection process. The control unit uses this advance information to pre-adjust or continuously adjust the lens position, ensuring focusing accuracy is maintained even as the projection position varies. This proactive measurement and adjustment approach preserves both motion adaptability and focusing precision.
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
Enables real-time automatic focusing in reflective motion projection systems, maintaining a clear projection image even during movement, enhancing user experience.
Implementation Method 1
a time of flight (TOF) assembly is configured beside a projector optical engine
Implementation Method 2
the reflection unit is configured to change a direction of outgoing light of the projection unit
Data Source
AI summary
Embodiments of the present disclosure relate to the technical field of digital projection and display, and in particular, relate to an automatic focusing projection method and system. The embodiments provide an automatic focusing projection method, which is applicable to an automatic focusing projection system. The automatic focusing projection system includes a ranging unit, a projection unit, and a reflection unit. The method includes: acquiring a depth image from the ranging unit, and acquiring a vertical projection distance from the ranging unit to a projection plane based on the depth image; acquiring position information of a center point of a projection picture in the depth image based on an elevation angle of the reflection unit and the vertical projection distance; acquiring a projection distance between the projection unit and the projection picture based on the position information; and performing focus adjustment on the projection unit based on the projection distance.