Projection Display Characteristic Point Detection
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Solution Overview
Problem
Existing projection display apparatus methods for detecting characteristic points on a projection surface are inefficient, particularly when the number of points is large, due to memory requirements, complexity in circuit detection, and potential false detection from small color differences.
Innovation Solution
A projection display apparatus that uses a test pattern image defined by at least three adjacent regions with different luminance, saturation, or hue, allowing for accurate detection of characteristic points and adjustment of the projected image, including storage of adjustment parameters for various viewing positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple characteristic points are detected by lighting them up one by one, then the characteristic points can be detected, but the number of test pattern images increases and large memory capacity is required
Solution Approach 1:
The patent combines multiple characteristic points into a single test pattern image by defining each characteristic point as a group of adjacent regions with different luminance levels. This allows all characteristic points to be displayed and detected simultaneously in one captured image, eliminating the need to store multiple separate test pattern images and significantly reducing memory requirements.
Solution Approach 2:
Each characteristic point is defined by adjacent regions with different local luminance qualities, allowing the imaging device to distinguish between multiple characteristic points within a single captured image. This local differentiation enables simultaneous detection of multiple points without requiring separate images for each point.
2Measurement precision
If differences between frames are detected to identify characteristic points, then characteristic points can be detected, but the detection circuit becomes complicated
Solution Approach 1:
The test pattern image is prepared in advance with characteristic points defined by adjacent regions of different luminance. This preliminary structuring of the test pattern eliminates the need for complex frame-to-frame difference detection circuits, as the characteristic points are inherently distinguishable within a single captured image based on their luminance characteristics.
3Measurement precision
If characteristic points are detected by lighting them up at different frequencies, then characteristic points can be detected, but the detection circuit becomes complicated
Solution Approach 1:
Instead of using different frequencies requiring complex detection circuits, the patent uses adjacent regions with different luminance levels to define each characteristic point. This local quality differentiation allows simple detection based on luminance variations within a single captured image, avoiding the need for frequency-based detection circuits.
4Measurement precision
If the number of characteristic points is increased, then more points can be detected, but false detection increases due to small color differences
Solution Approach 1:
Each characteristic point is defined by adjacent regions with distinct luminance levels, creating strong local quality differences that are easily distinguishable. This approach maintains high detection accuracy even when multiple characteristic points are present, as each point's adjacent regions provide clear visual distinction without relying on subtle color differences that lead to false detection.
Data Source
AI summary
A projection display apparatus includes an imager that modulates light emitted from a light source and a projection unit that projects light emitted from the imager on a projection surface. The projection display apparatus includes: an imager controller that controls the imager to display a test pattern image in which a characteristic point is defined by at least three adjacent regions; an acquisition unit that acquires a captured image of the test pattern image from an imaging element configured to capture the test pattern image projected on the projection surface; and an adjustment unit that identifies the characteristic point included in the captured image on the basis of the captured image acquired by the acquisition unit and adjusts an image to be projected on the projection surface on the basis of the identified characteristic point. The at least three adjacent regions surround the characteristic point and are adjacent to the characteristic point.