Gauge Line Mark Continuous Color Density Resolution
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Solution Overview
Problem
Conventional gauge line position measurement methods using linear gauge line marks with binary images, such as black and white, face limitations in achieving stable measurement accuracy and high resolution due to the discrete nature of pixel integration.
Innovation Solution
A non-contact video method employing a gauge line position measuring device with a video camera capturing gauge line marks featuring continuous harmonious color density symmetrically distributed with respect to the gauge line, allowing for improved measurement resolution by integrating image data in the orthogonal direction and calculating the gauge line position based on correlation functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a binary gauge line mark (black and white) is used, then the structure is simple and easy to manufacture, but the measurement resolution is limited to approximately a few to a few tenth of an interval between image elements
Solution Approach 1:
The patent changes the parameter of color density from binary (black and white) to continuous (multiple shades of gray). By introducing continuous harmonious color density with symmetric distribution, the system can detect position changes at a resolution finer than the image element interval, achieving measurement precision of approximately 0.01 to 0.1 times the image element interval without complicating the manufacturing process
2Device complexity
If image data is integrated in the direction orthogonal to the displacement direction, then the calculation is simplified, but stable measurement accuracy cannot be obtained with linear gauge line marks
Solution Approach 1:
The patent introduces asymmetric correlation function calculation to address the measurement accuracy problem. By calculating correlation functions between the integrated image data and reference patterns, and determining position based on the maximum correlation coefficient, the system achieves stable and accurate measurement while maintaining computational simplicity. The asymmetric correlation approach provides robustness against noise and discretization effects
3Measurement precision
If interpolating calculation using pixel pitches is performed, then measurement resolution can be improved, but it is limited to approximately a few to a few tenth of an interval between image elements
Solution Approach 1:
The patent changes the fundamental parameter from discrete pixel-based interpolation to continuous color density correlation analysis. By using continuous harmonious color density patterns and calculating correlations with reference functions, the system recovers position information with precision approaching the theoretical limit of the optical system, minimizing information loss compared to traditional pixel-interpolation methods
Data Source
AI summary
A gauge line position measuring device measures a position of a gauge line provided on a test piece by a non-contact video method. The measuring device includes a gauge line mark adapted to be provided on the test piece and has the gauge line and a first continuous harmonious color density arranged line-symmetrically with respect to the gauge line, and a video camera for taking an image of the gauge line mark on the test piece and outputting gauge line mark image data. A calculation device calculates a gauge line position based on the gauge line mark image data.