Projector-Camera Coordinate Mapping for Simple Calibration
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Solution Overview
Problem
Conventional calibration devices fail to associate projector and camera positions in a simple structure.
Innovation Solution
A projection control method and device that utilize a processor to project projection indexes, capture the image with a camera, display instructions for positioning camera indexes, detect camera coordinates, and determine correspondence relations between camera and projector coordinates to associate their positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional calibration devices are used, then projector calibration can be performed, but the association between projector and camera positions becomes complex
Solution Approach 1:
The patent introduces a calibration pattern as an intermediary object that bridges the projector and camera. The calibration pattern is projected by the projector and captured by the camera, establishing a common reference frame. This intermediary enables position association without requiring direct complex coordination between projector and camera systems.
Solution Approach 2:
The patent uses coordinate information copying between the projector's coordinate system and the camera's coordinate system through the calibration pattern. By detecting the positions of calibration markers in the captured image and comparing them with the known projected positions, the system copies and transforms coordinate data to establish the position association relationship.
2Measurement precision
If manual calibration methods are used, then position adjustment can be performed, but the calibration process becomes time-consuming
Solution Approach 1:
The calibration system performs self-calibration by automatically detecting the calibration pattern through the camera, calculating coordinate transformations, and adjusting projection parameters without requiring manual intervention. The system uses automated image processing and coordinate mapping algorithms to complete the calibration process independently, significantly reducing calibration time while maintaining precision.
Solution Approach 2:
The patent implements a feedback mechanism where the camera captures the projected calibration pattern, the system analyzes the captured positions, compares them with expected positions, and automatically adjusts the projection parameters based on the detected deviations. This closed-loop feedback process enables rapid iterative calibration with high precision.
Data Source
AI summary
A projection control method includes causing a projector to project a projection image including projection indexes, causing a camera to capture the projection image, causing a display to display an instruction for a user to position camera indexes within an imaging range, the camera indexes indicating positions relative to the projection indexes in a camera coordinate system obtained by capturing the projection image, detecting camera coordinates which are the coordinates of the camera indexes positioned, and determining, according to relative positional relations between the projection indexes and the camera indexes, the correspondence relations between the camera coordinates and projection coordinates.