Projector Parallax Correction via Angle-of-View Adjustment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing projector technologies face accuracy issues in trapezoid correction due to 'parallax' problems caused by the spaced-apart arrangement of image sensors and projecting lenses, leading to incomplete correction of deformed rectangular images.
Innovation Solution
A projecting apparatus with a zooming function, equipped with a distance measuring section, angle-of-view detecting section, and memory section, which captures screen-direction images, extracts screen frame positions, detects distances and angles, and adjusts the projection angle of view using stored parallax correction values to accurately project images onto a screen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If image sensor and projecting lens are arranged spaced apart to allow automatic adjustments, then ease of operation is improved, but measurement precision deteriorates due to parallax
Solution Approach 1:
The patent replaces the mechanical/optical arrangement of physically mounting the image sensor on the projector body with a computational approach. Instead of relying on physical co-alignment, the system uses parallax correction algorithms that calculate and compensate for the positional offset between the image sensor and projecting lens through software processing of the captured image data.
Solution Approach 2:
The patent introduces a parallax correction mechanism as an intermediary computational layer between the image sensor and the trapezoid correction process. This intermediary step processes the image data to account for the spatial offset, effectively mediating the discrepancy between the two optical components and enabling accurate correction despite their separated positions.
2Manufacturing precision
If trapezoid correction is applied to correct deformed rectangular image, then manufacturing precision is improved, but productivity deteriorates due to image compression
Solution Approach 1:
The patent addresses the image size reduction issue by introducing zooming functionality as an additional dimensional adjustment. After trapezoid correction restores the rectangular aspect ratio, the system provides zooming capability to enlarge the corrected image back to the desired projected size, effectively compensating for the compression that occurred during correction in a different operational dimension.
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
The solution enhances the accuracy of trapezoid correction, ensuring a precise rectangular image projection by continuously varying the projection angle of view and correcting parallax errors, resulting in a more effective and accurate image display.
Implementation Method 1
a distance measuring section configured to detect a distance and angle to the screen
Implementation Method 2
an image capture section configured to capture a screen-direction image including a light image projected by projecting section
Data Source
AI summary
An apparatus includes a projection system having a spatial light modulator and projection lens and configured to project a light image, an image capture system having an image capture lens and CCD and configured to capture a screen-direction image, a distance measuring sensor and distance measuring processing section configured to detect a distance and angle to the screen, a control section configured to, while extracting a screen frame position from the image obtained by the image capture system and, from respective detection results of the distance measuring and an angle-of-view detections, obtain a corrected value while referring to a correction table of a memory section storing corrected values of a parallax of the projection system and image capture system in a table form and match an image projected by the obtained corrected value to a screen frame position extracted.