Projector Keystone Correction via Angle Area Division
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Solution Overview
Problem
Existing projector technologies primarily focus on correcting keystone distortion for installations on stages or floors, failing to effectively address image shape corrections for projectors installed on walls or ceilings, especially in residential settings where varied installation angles are common.
Innovation Solution
A method and projector configuration that detects the installation angle relative to a reference direction, divides the angle range into areas, determines the correction amount based on the detected angle's area, and adjusts the image projection accordingly, using a detection, determination, correction, and projection process to ensure accurate image shaping across different installation angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the projector corrects distortion based on posture detection using acceleration sensor, then keystone distortion correction is achieved, but shape correction for varied installation angles (wall, ceiling) is insufficient
Solution Approach 1:
The patent applies parameter changes by dividing the installation angle range into multiple areas and setting different reference angles for each area. The system detects the installation angle and determines which area it belongs to, then selects the appropriate reference angle from the plurality of reference angles. This allows the correction amount to be accurately determined based on the specific installation angle, enabling precise shape correction for various installation positions including walls and ceilings.
2Manufacturing precision
If the correction amount is determined based on angle difference from reference angle, then accurate shape correction is achieved, but correction discontinuity occurs at area boundaries
Solution Approach 1:
The patent applies preliminary action by setting multiple reference angles in advance for different areas, and determining the area to which the detected installation angle belongs before calculating the correction amount. This preliminary area determination ensures that the appropriate reference angle is selected, maintaining correction continuity at area boundaries and preventing abrupt changes in correction amounts.
3Adaptability or versatility
If the projector supports various installation surfaces (wall, ceiling, floor), then versatility increases, but image shape distortion occurs for non-standard angles
Solution Approach 1:
The patent applies parameter changes by establishing a multi-area division system for installation angles, where each area has its own reference angle. This allows the system to adapt to various installation surfaces (walls, ceilings, floors) by selecting the appropriate reference angle based on the detected area, thereby maintaining accurate image shape correction across all installation positions.
Data Source
AI summary
The projector executes a detection step of detecting a rotational angle of the projector with respect to a horizontal direction, a determination step of determining a correction parameter of correcting a shape of an image to be projected based on the rotational angle detected, a correction step of correcting the shape of the image based on the correction amount determined in the determination step, and a projection step of projecting the image corrected in the correction step. In the determination step, a range of the installation angle at which the projector is installed is divided into a plurality of areas, which of the areas the rotational angle detected in the detection step belongs to is determined, and the correction parameter is determined based on a difference between the reference angle set in the area to which the rotational angle is determined to belong and the rotational angle detected.