Road Surface Sign Image Inverse Perspective Transformation
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Solution Overview
Problem
Existing road surface signs suffer from reduced legibility due to viewer angle and distance, leading to inconsistent enhancement and mismatch with the surrounding environment, as current methods rely on subjective adjustments and lack a standardized image conversion method.
Innovation Solution
A long-range discernible image generating apparatus and method that alter image proportions based on predetermined point of view information, including direction and angle of view, to apply inverse perspective transformation, ensuring consistent legibility and environmental matching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the width or length of the road surface sign is increased to enhance legibility, then the legibility is improved, but the sign may mismatch the surrounding environment and the enhancement effect is inconsistent
Solution Approach 1:
The patent applies inverse perspective transformation by changing the geometric parameters of the image based on viewer distance and angle. The image is transformed using perspective projection formulas that adjust width and height proportions dynamically, allowing the sign to maintain consistent legibility while adapting to different viewing conditions and environmental contexts.
Solution Approach 2:
The patent transitions from 2D image adjustment to 3D perspective transformation by incorporating depth information and viewing angle into the image generation process. This dimensional change allows the sign to appear correctly proportioned from the driver's perspective at various distances, resolving the contradiction between legibility enhancement and environmental matching.
2Ease of manufacture
If the width or length of the road surface sign is adjusted subjectively by constructor judgment, then construction convenience is improved, but the legibility enhancement effect becomes slight and inconsistent
Solution Approach 1:
The patent performs preliminary perspective transformation on the image before it is printed or displayed on the road surface. By pre-calculating and applying the inverse perspective distortion based on expected viewing conditions, the sign automatically achieves correct visual proportions when viewed by drivers, eliminating the need for subjective construction adjustments and ensuring consistent legibility enhancement.
3Manufacturing precision
If the image is transformed to account for perspective distortion, then legibility at distance is improved, but the image proportions are altered excessively
Solution Approach 1:
The patent carefully controls the transformation parameters by using perspective projection formulas that calculate the exact scaling factors needed based on viewing distance and angle. This precise parameter adjustment ensures that the image is distorted only to the extent necessary for correct perspective appearance, preventing excessive transformation while achieving improved long-range legibility.
Data Source
AI summary
The present invention relates to a long-range discernible image generating apparatus and a method of operating the same, and particularly, to a long-range discernible image generating apparatus and a method of operating the same, which are capable of providing improved legibility. According to an embodiment of the present invention, a long-range discernible image generating apparatus is provided. The long-range discernible image generating apparatus includes an image providing unit for providing a first image including at least one character; an image converting unit for generating a second image which has the proportions of the first image altered by reflecting predetermined point of view information—the point of view information including information on at least one of a direction of view and an angle of view for the first image; and a reference point extracting unit for extracting the coordinates for the first reference point and the coordinates for the second reference point corresponding to the first reference point and the image converting unit compares the coordinates for the first reference point to the coordinates for the second reference point so as to be able to convert the first image.