Projector Mark Position Detection Using Local Quality
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Solution Overview
Problem
Existing projector systems require complex position detection processes due to varying dot sizes in captured images, which are influenced by distance from the imaging section, leading to difficulties in accurately detecting projection marks at different distances.
Innovation Solution
The method involves projecting a first mark and a second mark on a projection surface with varying distances and sizes, generating captured image data, and using detectors to accurately detect their positions based on the data, with the first mark being larger and farther away, and the second mark being smaller and closer, to minimize size differences in the captured image, facilitating simpler detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If marks are projected at different distances from the imaging section, then the detection area is expanded, but the size variation of marks in the captured image increases
Solution Approach 1:
The patent applies local quality by setting different sizes for marks at different distances from the imaging section. Specifically, marks located farther from the imaging section are made larger than marks closer to it, compensating for the perspective effect that would otherwise cause size variation in the captured image. This allows all marks to appear with consistent sizes in the captured image, simplifying position detection.
2Ease of manufacture
If marks of the same size are projected on the projection surface, then the projection is simplified, but the captured image requires complicated position detection processes
Solution Approach 1:
The patent resolves this contradiction by making mark sizes non-uniform based on their distance from the imaging section. Marks farther away are made larger while closer marks are made smaller, ensuring that after perspective projection, all marks appear with consistent sizes in the captured image. This eliminates the need for complicated position detection processes that would otherwise be required to handle varying mark sizes.
Data Source
AI summary
A method for controlling a projector includes projecting a projection image representing a first mark and a second mark on a projection surface, generating captured image data representing a captured image by causing the imaging section to capture an image of the projection image displayed on the projection surface, and detecting the position of the first mark and the position of the second mark based on the captured image data. The first mark and the second mark are so located in the captured image that a first distance between the first mark displayed on the projection surface and the imaging section is longer than a second distance between the second mark displayed on the projection surface and the imaging section. The size of the first mark is greater than the size of the second mark in the captured image.