Projected Image Rectangularity Evaluation for Keystone Correction
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Solution Overview
Problem
Existing trapezoidal correction technologies lack a unified standard for evaluating the correction result, leading to low efficiency and difficulty in determining correction accuracy, especially when the projector and projection plane have a roll angle, resulting in oblique rectangles rather than horizontal rectangles.
Innovation Solution
A method and apparatus for evaluating the distortion correction result of a projected picture by obtaining angle point coordinates and calculating four included angles between the projected quadrangle and an absolute rectangle, using a Cartesian coordinate system to assess rectangularity and levelness, providing a comprehensive evaluation standard.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If trapezoidal correction technology is applied to enable projection without direct facing, then ease of operation is improved, but there is no unified standard to evaluate correction accuracy, leading to difficulty in determining correction precision
Solution Approach 1:
The patent changes the evaluation parameters from subjective visual assessment to objective quantitative measurements including rectangularity (deviation from 90-degree angles) and levelness (deviation from horizontal/vertical axes). By defining specific parameter thresholds, the system provides standardized precision evaluation for trapezoidal correction results.
2Adaptability or versatility
If multiple correction solutions are provided to achieve trapezoidal correction, then adaptability is improved, but correction efficiency decreases due to lack of unified evaluation standard
Solution Approach 1:
The patent implements a feedback mechanism where the evaluation module continuously assesses correction results using rectangularity and levelness parameters. This feedback enables automatic adjustment of correction algorithms, improving efficiency by eliminating manual trial-and-error processes while maintaining adaptability across different correction scenarios.
3Adaptability or versatility
If trapezoidal correction is applied to accommodate various projection angles, then adaptability is improved, but correction accuracy becomes difficult to determine without standardized metrics
Solution Approach 1:
The patent introduces a new dimensional framework for evaluation by incorporating both angular measurements (rectangularity for angle accuracy) and positional measurements (levelness for horizontal/vertical alignment). This two-dimensional evaluation approach comprehensively assesses correction accuracy regardless of projection angle, providing standardized metrics that work across all adaptability scenarios.
Data Source
AI summary
A projected image deformation correction result evaluation method includes: obtaining corner point coordinates of a projected image, wherein the projected image is a quadrilateral, and the corner point coordinates are coordinates corresponding to four corners of the quadrilateral in a rectangular coordinate system; obtaining four included angles between four sides of the projected image and the corresponding sides of an absolute rectangle, wherein the X-axis is the horizontal direction, and the Y-axis is the vertical direction; determining values of the four included angles on the basis of the corner point coordinates; and evaluating a correction result of the projected image on the basis of the values of the four included angles.