Image Projection PWM Pattern Insertion for Real-Time Distortion Correction
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Solution Overview
Problem
Existing image projection systems interrupt the viewer's experience by requiring the display of view-use images to be halted for distortion correction, as they need to project a pattern image and capture it to calculate correction parameters.
Innovation Solution
An image processing apparatus using a pulse width modulation (PWM) method that outputs a pattern image during a portion of the single-frame output period of a view-use image, allowing for real-time correction parameter calculation and image correction without interrupting the viewer's experience, by controlling the pattern image output period to be within the range of minimum to less than a minimum significant pixel value of the view-use image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pattern image is projected and captured to calculate correction parameters, then image correction accuracy is improved, but the view-use image display is interrupted
Solution Approach 1:
The system uses periodic action by inserting pattern image projection and capture operations at specific intervals within the frame output period, rather than continuously interrupting the view-use image display. The pattern image is projected during designated periods when the view-use image is not being displayed, allowing correction parameter calculation to proceed periodically without constant interruptions.
Solution Approach 2:
The frame output period is segmented into multiple portions: a first period for projecting the pattern image, a second period for capturing the pattern image, and a third period for projecting the view-use image. This segmentation allows each operation to occur in its designated time slot, enabling correction parameter calculation to proceed without interrupting the overall view-use image display continuity.
2Measurement precision
If the pattern image output period is extended to improve capture quality, then measurement precision is improved, but the view-use image output time is reduced
Solution Approach 1:
The system applies partial action by capturing the pattern image during a specific portion of the first period rather than requiring the entire period. The capture operation is designed to complete within the allocated time, using only the necessary duration to achieve sufficient capture quality, thereby leaving room for the view-use image to be displayed during the remaining time.
Solution Approach 2:
The system changes parameters by adjusting the brightness of the pattern image to be lower than the view-use image, and by controlling the capture timing and duration. These parameter adjustments allow the pattern image to be captured with sufficient quality during the first period without excessively reducing the view-use image output time in the third period.
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 continuous display of undistorted images by calculating and applying correction parameters without stopping the view-use image presentation, improving user experience by maintaining uninterrupted image projection.
Implementation Method 1
an image projection section configured to perform an image projection process based on a pulse width modulation (PWM) method
Data Source
AI summary
Provided is an apparatus that includes an image projection section that performs an image projection process based on a PWM method, an output image control section that sets a portion of a single-frame output period of a view-use image as a period in which to output a pattern image to be used for calculating an image correction parameter, a correction parameter calculation section that calculates the image correction parameter with use of the pattern image captured by a camera in the pattern image output period, and an image correction section that performs a correction process on the view-use image with use of the image correction parameter. The output image control section controls the pattern image output period in such a manner that pixel values of the pattern image fall within a range from a minimum pixel value to less than a minimum significant pixel value of the view-use image.