Projector Dot Pattern Layout for Positional Shift Correction
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Solution Overview
Problem
Existing image projection systems face challenges in accurately detecting and correcting positional shifts of projected images due to insufficient detection accuracy of dot patterns, particularly when the projector is not installed squarely or when the projection surface has irregularities.
Innovation Solution
A projector system that projects a dot pattern with distinctively colored detection dots (red, blue, green, white, and black) arranged in a matrix at the center of the image, allowing for improved detection accuracy by associating these dots in captured images using a controller that performs image analysis and generates correction data for positional shifts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple dot pattern is used for projection, then the device complexity is reduced, but the measurement precision of dot detection deteriorates
Solution Approach 1:
The patent applies local quality by assigning different display modes to different dots in the pattern. Specifically, five dots are displayed in different display modes (first through fifth display modes) while other dots are displayed in a fourth display mode. This creates locally distinct characteristics that enable accurate identification and association of dots between projected and captured images, thereby improving detection accuracy without requiring complex overall pattern structure.
2Manufacturing precision
If the projector is not installed squarely or the projection surface has irregularities, then the manufacturing precision of installation is reduced, but the measurement precision of image correction deteriorates
Solution Approach 1:
The patent implements feedback by capturing the projected dot pattern with an imager and using the captured image to generate correction data. The controller associates dots in the captured image with corresponding dots in the projected pattern, calculates positional shifts, and generates correction data that compensates for installation irregularities. This feedback loop enables accurate image correction even when the projector is not installed squarely or the projection surface has irregularities.
Data Source
AI summary
A projector projects a dot pattern onto a projection surface, the dot pattern containing a first dot, a second dot, a third dot, a fourth dot, and black dots. The first dot, the second dot, the third dot, the fourth dot, and the black dots are displayed in different modes. The first dot is adjacent to the second dot in the horizontal direction and also adjacent to the third dot in the vertical direction. The second dot is adjacent to the fourth dot in the vertical direction, and the third dot is adjacent to the fourth dot in the horizontal direction.