Projection Display Image Rotation Synthesis for Multi-Viewer Orientation
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Solution Overview
Problem
Projection type displays that project images on horizontal flat planes, such as tables, often result in poor visual recognition for viewers surrounding the image due to varying angles of view, as the image direction changes with the position of each viewer, leading to potential misalignment between the image orientation and the viewer's perspective.
Innovation Solution
Incorporating an image processing unit with first and second image rotation units and a two-image synthesizing unit to rotate and synthesize input images by specific angles, ensuring that each viewer sees the image aligned with their perspective, thereby maintaining good visual recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an image is projected on a horizontal flat plane such as a table, then the projection type display can be used for conference usage types with multiple viewers, but the visual recognition becomes poor because the image direction changes with the position of each viewer
Solution Approach 1:
The projected image is divided into multiple segments corresponding to different viewing positions. The image processing unit creates multiple rotated versions of the input image (first rotated image, second rotated image, etc.), each optimized for a specific viewer position. These segmented images are then synthesized into a single composite projection that provides appropriate orientation for multiple viewers simultaneously.
Solution Approach 2:
The system dynamically adjusts image orientation based on viewer positions. The image processing unit rotates the input image by different angles (first angle, second angle, etc.) to create rotated images that adapt to the specific viewing angles of different viewers. This dynamic rotation and synthesis process ensures that each viewer sees the image in the correct orientation for their position.
2Ease of operation
If the image is projected without rotation, then the projection type display is simple to operate, but viewers surrounding the image see it upside down or at wrong orientation
Solution Approach 1:
The system performs preliminary rotation of the input image before projection. The image processing unit rotates the input image by predetermined angles (first angle, second angle, etc.) to create rotated images that are pre-adjusted for specific viewing positions. This preliminary action ensures that when the composite image is projected, each viewer automatically sees the correctly oriented image without needing to manually adjust anything during operation.
3Manufacturing precision
If multiple rotated images are synthesized into one, then good visual recognition is provided to multiple viewers, but the device complexity increases
Solution Approach 1:
The image processing unit performs multiple functions using a single integrated system. It simultaneously rotates the input image by multiple different angles, synthesizes the rotated images into a composite image, and outputs the final projection. This multi-functional approach consolidates what could be multiple separate devices into one unit, managing the complexity while achieving precise image orientation for multiple viewers.
Data Source
AI summary
In the usage of table projection of a projection type display, depending upon a sitting position of a participant of a conference, the participant views an image projected upon a table as an inversion image turned upside down, resulting in poor visual recognition. In order to improve visual recognition, images are rotated, synthesized and displayed in accordance with the viewing direction of each participant. More specifically, the projection type display is provided with a two-image synthesizing unit for synthesizing two images obtained by processing an input image by two image rotation units for rotating the input image by a first angle and a second angle different from the first angle, into one image on a screen. The projection type display is also provided with an image rotation unit and an image inversion unit for two-image display on a screen.