Projection System Optical Indication Tracking
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Solution Overview
Problem
During presentations, it is inconvenient for presenters to note content on a projected image using a mouse or presentation pen, as they need to stay near the computer or have a flat desktop, and using a laser pen for indication is not as direct or convenient.
Innovation Solution
A projection system that includes a projector module, a photography module, and a processing module, which projects an image frame with feature points, photographs the image to identify an indication point, and uses linear-approximation and coordinate transformation methods to determine the indication point's position in the original image frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a mouse or presentation pen is used to note content on the projected image, then the presenter can interact with the presentation content, but the presenter needs to stay near the computer or have a flat desktop, which is inconvenient
Solution Approach 1:
The patent replaces the mechanical interaction system (mouse or presentation pen requiring physical contact with a flat surface) with an optical detection system. The photography module captures the projected image and the indication point, and the processing module calculates the coordinate transformation to determine the indication point's position in the original image frame. This allows the presenter to note content anywhere in the projected image without needing a flat desktop or staying near the computer.
2Ease of operation
If a laser pen is used to perform indication, then the presenter can indicate content directly, but it is not as convenient as using a mouse click function
Solution Approach 1:
The patent enables the system to automatically record presentation notes by detecting the indication point and calculating its position in the original image frame. The processing module automatically determines the coordinate transformation based on feature points and transforms the indication point coordinates, eliminating the need for manual note-taking or complex interaction mechanisms. The system serves itself by automatically capturing and processing the indication information.
3Ease of operation
If the photography module photographs the projected image to obtain indication point positions, then direct detection and tracking is enabled, but additional processing steps are required
Solution Approach 1:
The patent performs preliminary actions by pre-establishing the correspondence relationship between feature points in the original image frame and their positions in the photographed image frame. The processing module calculates the coordinate transformation equations based on these pre-identified feature points, so that when the indication point is detected, the position can be directly transformed without requiring complex real-time calculations or additional processing steps.
Data Source
AI summary
A projection system and an image processing method thereof are provided. The system includes a projector module, a photography module and a processing module. The projector module projects a first image frame to an object surface. The photography module photographs the object surface to derive a second image frame including the first image frame and an indication point, wherein the indication point is formed by light projected on the object surface by an external device. The processing module analyzes the second image frame to derive coordinate of the indication point in the second image frame, derives coordinate of at least a feature point of the first image frame in the second image frame according to a linear-approximation method, and transforms the coordinates of the indication point in the second image frame to the coordinates in the first image frame by using two-dimensional coordinate transformation equations.