Projection Control Device Marker Alignment for Handheld Camera Shake
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Solution Overview
Problem
Existing projection systems face challenges in accurately correcting images projected onto surfaces with colors or patterns, as the image pickup device's unstable position can lead to blurred images due to camera shake, making it difficult to align and correct the projected images effectively.
Innovation Solution
A projection control device that projects correcting images with specific markers, including a first polygon and a second polygon positioned inside the first polygon, where at least one side of the first polygon is non-parallel to the sides of the second polygon, allowing for accurate detection and alignment by an image pickup device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a general-purpose digital camera is used to pick up the projected image, then the device simplicity and ease of operation are improved, but the image pickup stability deteriorates due to camera shake, causing blurred images
Solution Approach 1:
The patent introduces a marker as an intermediary element between the projector and the image pickup device. The marker contains distinctive geometric patterns (first and second polygons with non-parallel sides) that serve as a reference for positional alignment. By detecting the marker's position and orientation in the picked-up image, the system can compensate for camera shake and achieve stable image alignment without requiring the camera to remain perfectly stationary.
2Measurement precision
If multiple correcting image patterns are projected continuously, then the image correction accuracy is improved, but the image pickup stability deteriorates due to camera shake during continuous projection
Solution Approach 1:
The patent applies preliminary action by projecting the marker before the correcting image patterns. The marker is projected first to establish a reference for positional alignment, and only after the marker is detected and alignment is calculated does the system proceed to project the correcting image patterns. This sequence ensures that the camera position is stabilized and aligned before capturing the correcting images, preventing camera shake from affecting the measurement precision.
3Ease of operation
If the image pickup device is held by the user, then the ease of operation is improved, but the positional alignment precision deteriorates due to unstable camera position
Solution Approach 1:
The patent implements feedback by detecting the marker's position and orientation in the picked-up image, then using this information to calculate the necessary positional and rotational adjustments. The system feeds back the alignment status and automatically adjusts the projecting position and orientation based on the detected marker characteristics. This closed-loop feedback mechanism compensates for the unstable camera position caused by handheld operation, achieving precise positional alignment without requiring the camera to be fixed.
Data Source
AI summary
A projection control device according to the invention includes a projection module configured to project a correcting image in which a marker including a first polygon and a second polygon disposed inside the first polygon is provided in a predetermined position in such a manner as to be picked up by an image pickup device, and at least one of sides of the first polygon is not parallel to sides of the second polygon.