Curved Surface Video Projection Distortion Correction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional display apparatuses struggle to project undistorted video images onto curved or uneven surfaces due to differences in surface undulation, leading to distorted images.
Innovation Solution
A display apparatus that measures the distance and shape of the object in real-time using a light pulse flight time method, employing a reflection mirror for two-dimensional raster scanning and correcting pixel distortions based on detected surface contours, allowing for precise distance and reflectance measurements and undistorted video projection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a beam projection method is used to display images on objects with various contours, then the apparatus can be made small and portable, but the projected image becomes distorted on undulated or uneven surfaces
Solution Approach 1:
The system performs preliminary measurement of the object surface contour and distance before image projection. The measurement unit detects the actual surface geometry in advance, and the control unit pre-calculates the necessary pixel rearrangement to compensate for expected distortions, ensuring undistorted image display on uneven surfaces
Solution Approach 2:
The system establishes a feedback loop where the measurement unit continuously monitors the object surface contour and distance, feeds this information to the control unit, which then adjusts the pixel arrangement in real-time. This closed-loop control ensures that images remain undistorted even when projected on dynamically changing surfaces
2Area of stationary object
If the projected video is displayed enlarged in proportion to the projection distance, then the image covers a larger area, but the image distortion increases on undulated surfaces
Solution Approach 1:
The system applies different pixel arrangement strategies to different regions of the projected image based on local surface characteristics. The control unit divides the projection area into multiple zones and independently adjusts pixel distribution in each zone according to the measured local contour and distance, optimizing both coverage area and image quality for each region
3Measurement precision
If a light pulse flight time measuring method is used to detect surface contours, then measurement precision is improved, but the measurement time increases
Solution Approach 1:
The system uses periodic pulsed light emission and synchronous detection to measure surface contours. By emitting light in periodic pulses and detecting reflected light at specific time intervals, the system achieves high measurement precision through time-of-flight calculations while maintaining fast measurement speeds through the periodic nature of the operation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables undistorted video projection on curved or uneven surfaces by accurately determining surface contours and correcting pixel distortions, enhancing the usability and image quality of the display apparatus.
Implementation Method 1
A first display apparatus of this invention has the above measuring device. It also has a reflection mirror oscillating on one or two axes
Implementation Method 2
a reflection mirror oscillating on one or two axes, a horizontal/vertical oscillation drive means to drive the reflection mirror
Data Source
AI summary
A display apparatus is provided which, when projecting a video onto a curved surface of an object for display, can realize an undistorted display of the video. The measuring means outputs the distance information representing the distance to the object. Based on the distance information produced by the measuring means, the curved surface contour is detected with high precision. According to at least the detected curved surface contour distortions, pixels of the display image are unevenly rearranged to correct the video information before it is output. This arrangement realizes an undistorted display of video when the video is projected onto the curved surface of the object.