Projection Screen Image Correction Using Camera Preview Feedback
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Solution Overview
Problem
Ultra-short throw laser projection devices face issues with image deformation and misalignment, causing projected images to extend beyond the projection screen due to accidental movement, resulting in poor display effects.
Innovation Solution
A method and system involving a shooting device with a camera that captures a preview image, displays adjustment prompts, and sends the shot image to a laser projection device for correction, ensuring the projected image remains within the screen boundaries by adjusting camera parameters and correcting the projected image based on the shot image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the laser projection device projects images without correction, then the projection process is simple and fast, but the projected image extends beyond the projection screen causing poor display effects
Solution Approach 1:
The system performs preliminary actions by capturing a shot image of the projection screen before actual projection, detecting the screen's position and boundaries in advance, and pre-calculating correction parameters. This preliminary detection and calculation ensure that the subsequent projected image is accurately aligned within the screen boundaries, resolving the contradiction between image precision and system complexity.
Solution Approach 2:
The laser projection device uses its own projection function to display a test pattern on the screen, then uses the camera to capture the screen's position. The system automatically calculates correction parameters based on the captured image and applies them to subsequent projections. This self-service approach eliminates the need for external alignment equipment, achieving high precision without excessive system complexity.
2Measurement precision
If the camera captures the projection screen for correction, then image alignment is improved, but the shooting parameters require adjustment and the process becomes more complex
Solution Approach 1:
The system displays real-time preview images from the camera showing the projection screen's position and boundaries. Based on this visual feedback, the system automatically adjusts camera parameters and guides the user to optimize the shot composition. This feedback mechanism ensures high detection precision while simplifying operation, as the system handles parameter adjustments automatically based on the preview feedback.
Solution Approach 2:
The system automatically changes camera parameters such as focal length, aperture, and shooting distance based on the detected projection screen size and distance. By dynamically adjusting these parameters, the system optimizes the captured image quality for accurate screen boundary detection without requiring manual parameter tuning, thus maintaining ease of operation while achieving high measurement precision.
Data Source
AI summary
Provided is a method for correcting an image. In the method, the shooting device displays a preview picture, wherein the preview picture at least includes frames of a projection screen and a projected image; the shooting device displays adjustment prompt information in response to at least two of the frames of the projection screen in the preview picture being beyond a target region of the preview picture, wherein the adjustment prompt information is configured to instruct to adjust shooting parameters of the camera; the shooting device acquires, in response to a shoot operation, a shot image captured by the camera; the shooting device sends the shot image to a laser projection device; and the laser projection device corrects a projected image for display based on the shot image.