Camera-Guided Projector Keystone Correction for Flexible Positioning
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Solution Overview
Problem
Conventional projectors face challenges in accurately projecting images due to keystone distortion when not positioned straight on a projection surface, requiring complex calculations and prone to errors in alignment correction processes.
Innovation Solution
An electronic device equipped with a camera, display, communication interface, and processor that captures a projection surface with markers, determines the maximum projection area, and transmits keystone correction information to the projector device to adjust the image projection accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the projector is placed at an angle or not straight on the projection surface, then the projector can be positioned more flexibly, but keystone distortion occurs in the projected image
Solution Approach 1:
The system performs preliminary actions by capturing the projection surface with markers before projection, calculating the misalignment angle in advance, and pre-processing the captured image to determine correction parameters. This allows the projector to maintain flexible positioning while achieving accurate projection through pre-calculated keystone correction values.
Solution Approach 2:
The system uses feedback by capturing the projection surface with markers, calculating the actual misalignment angle, and using this information to determine keystone correction parameters. The correction process is guided by feedback from the captured image and calculated angles, enabling the system to adapt to different projector positions and achieve accurate projection.
2Measurement precision
If the conventional image processing method is used to calculate misalignment angle, then the projector can achieve projection correction, but the calculation process becomes complex and time-consuming
Solution Approach 1:
The system segments the projection surface by placing multiple markers at specific positions (e.g., four corners) on the surface. This segmentation allows the system to calculate misalignment angles independently for different regions and combine them to determine overall keystone correction parameters, simplifying the complex image processing into manageable discrete calculations.
Solution Approach 2:
The system introduces markers as intermediaries between the projector and the projection surface. These markers serve as reference points that simplify angle calculation by providing clear, easily detectable positions. The markers mediate the measurement process, making it easier to calculate misalignment angles without complex image processing of the entire projected image.
3Manufacturing precision
If the correction process is performed to align the optical axis with measurement axis, then projection accuracy is improved, but errors in the correction process significantly affect the angle calculation
Solution Approach 1:
The system creates a copy of the projection surface by capturing an image of it with markers. This captured image serves as a reference model that can be processed independently to calculate misalignment angles. By working with this copied representation rather than directly adjusting the optical axis, the system improves reliability of angle calculation while maintaining projection accuracy.
Data Source
AI summary
An electronic including a camera; a display; a communication interface; a memory; and one or more processors. The display displays an image obtained by the camera according to a projection surface on which a test image including a plurality of markers is projected, when first information indicating positions of the plurality of markers and second information indicating the position of a maximum projection area are received from a projector device. The processor(s) obtains fourth information indicating the position of the maximum projection area within the obtained image based on the first information, the second information, and third information based on the obtained image. A guide GUI guiding the projection area is displayed based on the obtained fourth information; and keystone correction information for projecting an image corresponding to the guide area corresponding to the guide GUI is transmitted to the projector device through the communication interface.