Projection Thermal Defocus Compensation Using Bidirectional Feedback
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Solution Overview
Problem
Existing projection thermal defocusing solutions provide poor user experiences and inadequate compensation due to lack of consideration for device-specific circumstances and structure differences, leading to suboptimal compensation effects.
Innovation Solution
A bidirectional compensation method for projection thermal defocusing that involves real-time analysis of projected images to determine similarity and definition values, adjusting the motor direction based on these values without relying on a specified compensation direction or focusing map, using a motor to rotate in alternating directions until optimal focus is achieved.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a default compensation direction is used to drive the motor, then the device complexity is reduced, but the compensation effect deteriorates because it cannot consider both temperature and structure differences
Solution Approach 1:
Instead of using a fixed default compensation direction, the patent inverts the approach by dynamically determining the optimal compensation direction based on real-time image analysis. The system calculates definition values in multiple directions and selects the direction that yields the best focus, thereby achieving high precision without requiring complex pre-configured directional compensation mechanisms.
Solution Approach 2:
The patent implements a feedback mechanism where the system continuously captures images, calculates definition values, and adjusts the compensation direction based on the results. This closed-loop feedback allows the system to adapt to varying temperature and structural conditions, maintaining high compensation precision while keeping the overall device complexity manageable through iterative optimization.
2Manufacturing precision
If real-time image analysis is performed to determine compensation direction, then the compensation effect is improved, but the loss of time increases due to multiple image captures and calculations
Solution Approach 1:
The patent applies partial action by performing image analysis only on specific regions or using simplified calculation methods for definition values. Instead of analyzing every pixel in full resolution, the system uses representative samples or reduced-resolution processing, thereby achieving sufficient compensation precision while significantly reducing the time required for image analysis and processing.
Solution Approach 2:
The system performs preliminary actions by pre-processing images or pre-calculating reference values that can be quickly compared during real-time operation. This allows the feedback mechanism to operate more efficiently, reducing the computational time required for each compensation cycle while maintaining accurate focus adjustment.
3Measurement precision
If a focusing map is projected to determine definition, then the measurement precision is improved, but the device complexity increases due to requiring a specific focusing map
Solution Approach 1:
The patent implements self-service by enabling the system to automatically generate and update its own focusing reference data from captured images, eliminating the need for external pre-configured focusing maps. The system analyzes real images, calculates definition values, and adapts to different projection surfaces and conditions autonomously, thereby maintaining high measurement precision while reducing device complexity.
Solution Approach 2:
The system dynamically changes parameters such as definition calculation methods and image processing thresholds based on real-time conditions rather than relying on fixed focusing maps. This allows the system to adapt to varying environmental and structural conditions, achieving accurate focus measurement without requiring complex pre-programmed focusing data for every possible scenario.
Data Source
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AI summary
The present disclosure relates to the technical field of compensation for projection thermal defocusing, and the embodiments specifically disclose a bidirectional compensation method and apparatus for projection thermal defocusing, and a readable storage medium. The bidirectional compensation method for projection thermal defocusing provided in the present disclosure comprises determining whether to proceed to a definition value determination step according to whether a similarity value of two latest projected picture images satisfies a preset similarity value requirement; by means of the method of proceeding to first-direction thermal defocusing compensation or second-direction thermal defocusing compensation by comparing the magnitude of definition values of the latest two projected picture images, non-perception compensation for projection thermal defocusing is achieved, without using a specified compensation direction and a specific focusing map, and a compensation effect is achieved by means of real-time analysis of projected pictures, the operation being convenient and suitable for widespread popularization.