Projector Image Correction for Undetected Screen Sides
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Solution Overview
Problem
Projectors struggle to correctly correct projected images when the aspect ratio of the screen frame differs from the aspect ratio of the projected image, leading to image distortion and overflow, especially when the projection distance is short and the screen aspect ratio is 4:3 while the projector aspect ratio is 16:10.
Innovation Solution
A projector system that includes an image pickup unit, outer peripheral line calculating units, an imaginary screen aspect ratio calculator, and a correction image light modulation area calculator, which supplements undetected screen sides and adjusts the aspect ratio to fit the projected image within the screen frame, maintaining the original aspect ratio of the projector's light modulation area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the projector uses traditional image pickup and detection methods, then the device complexity is reduced, but the measurement precision of screen frame sides deteriorates when aspect ratios differ
Solution Approach 1:
The calculating unit is divided into multiple specialized units: a first outer peripheral line calculating unit for calculating image light sides, a second outer peripheral line calculating unit for calculating screen sides, and an imaginary screen outer peripheral line calculating unit for supplementing undetected sides. This segmentation allows each unit to handle specific calculation tasks independently, improving precision without requiring a single complex unit to handle all cases.
Solution Approach 2:
The patent introduces an 'imaginary screen' as an intermediary concept. When a screen side cannot be detected, the system creates an imaginary screen frame using calculated image light sides as substitutes. This intermediary allows the system to proceed with image correction even when complete screen detection is unavailable, bridging the gap between incomplete detection and successful correction.
2Adaptability or versatility
If the projector assumes a fixed aspect ratio relationship, then the ease of operation is improved, but the adaptability to different screen aspect ratios deteriorates
Solution Approach 1:
The system dynamically changes the aspect ratio parameter based on actual detection results. Instead of assuming a fixed relationship between projector and screen aspect ratios, the calculating unit determines the actual screen frame geometry from detected sides and calculates the appropriate correction parameters accordingly. This allows automatic adaptation to various screen sizes and aspect ratios without manual intervention.
Solution Approach 2:
The projector performs self-determination of screen frame geometry by automatically detecting screen sides and calculating the appropriate correction parameters without user input. The system serves itself by autonomously adapting to different screen configurations, eliminating the need for users to manually configure aspect ratio settings while maintaining high adaptability.
3Productivity
If the projector uses short projection distance, then the productivity is improved, but the measurement precision of screen frame deteriorates
Solution Approach 1:
The patent transitions from two-dimensional screen detection to three-dimensional spatial reasoning by calculating the projection relationship between the projector and screen based on detected image light sides. This dimensional approach allows the system to infer screen frame geometry even when direct detection is limited by short projection distance, maintaining precision through geometric calculation rather than direct measurement.
Data Source
AI summary
First imaginary screen outer peripheral line is calculated supplementing one side that is undetected with one side of an outer peripheral line of image light that is calculated, an imaginary screen aspect ratio that is an aspect ratio of an area defined by the first imaginary screen outer peripheral line is calculated, whether the imaginary screen aspect ratio is more vertically oriented than a first ratio or not is determined. When a result of the determination of the imaginary aspect ratio is more vertically oriented than the first ratio, the imaginary screen aspect ratio is changed to second ratio that is different from the first ratio, and the one undetected side is calculated according to the second ratio, and the first imaginary screen outer peripheral line is corrected and a second imaginary screen outer peripheral line is calculated.