Projection Control Apparatus for Automatic Image Shape Adjustment
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Solution Overview
Problem
Permanently installed projection display systems require extensive expertise and manpower for initial installation and image shape adjustment, as existing methods struggle to accurately detect coordinates on the display plane from captured images, leading to increased adjustment time.
Innovation Solution
A projection control apparatus with an acquisition unit for capturing images, a specification unit to identify the image projection area, an association unit to link image coordinates with managed coordinates, and a control unit for distortion correction processing, utilizing a camera and projector system to efficiently adjust the projection image shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an adjustment pattern with sparkle points or crosses aligned at regular intervals is projected, then the projection display system can be set up, but it is difficult to detect the coordinates closely on the display plane from the captured image
Solution Approach 1:
The adjustment pattern is divided into multiple sub-patterns with different spatial periods. Each sub-pattern contains features at different scales, allowing detection at various levels of magnification. This segmentation enables accurate coordinate detection by analyzing features across multiple spatial frequencies simultaneously.
Solution Approach 2:
Different regions of the adjustment pattern have different local properties - some areas contain fine-detail features while others contain coarse features. This local quality variation allows the detection system to adapt to different spatial frequencies and accurately identify coordinates regardless of the camera's distance or focal length.
2Ease of manufacture
If manual adjustment of projection image shape is performed, then the projection display system can be installed, but it requires a great deal of expertise and manpower
Solution Approach 1:
The system performs automatic adjustment by capturing the projected adjustment pattern with a camera and computing the projection parameters automatically. The processor analyzes the captured image and self-determines the distortion correction parameters without requiring manual measurement or expert intervention, making the installation process self-service oriented.
Solution Approach 2:
The manual mechanical adjustment process is replaced with an automated optical-digital system. Instead of physically adjusting the projector by hand based on expert knowledge, the system uses camera capture and digital image processing to automatically determine and apply the correct projection parameters.
3Productivity
If the captured image is used directly for coordinate analysis without extracting the projection display image area, then the process is simpler, but the adjustment time increases
Solution Approach 1:
The system performs preliminary extraction of the projection display image area from the captured image before conducting coordinate analysis. By identifying and isolating the relevant projection area in advance, the subsequent coordinate detection and adjustment processes work only with the necessary data, improving overall processing efficiency.
Data Source
AI summary
A projection control apparatus includes an acquisition unit configured to acquire a captured image of a projection plane on which a first image is projected by a projection unit, a specification unit configured to specify an image projection area of the projection unit within the captured image acquired by the acquisition unit, an association unit configured to, in the captured image of the projection plane on which a second image different from the first image is projected by the projection unit, associate coordinates on the image projection area specified by the specification unit with coordinates managed by the projection unit, and a control unit configured to calculate distortion correction parameter for the projection unit by using an association result of the between the coordinates by the association unit. The projection control apparatus can reduce the time for adjustment of a projection image shape.