Dual-path radon transformation based test curve inflection point interval calculating method
A calculation method and dual-path technology, which can be used in computing, image data processing, instruments, etc., to solve problems such as large influence on extraction accuracy, misjudgment of inflection points, and inappropriate extraction of inflection points of online test curves containing noise signals.
Inactive Publication Date: 2014-10-22
BEIHANG UNIV
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Under the influence of factors such as external interference signals, the industrial test curve is several approximate straight lines with low-frequency noise signals and blurred inflection points, and the smoothness is very poor
The inflection point extraction accuracy of the test curve is greatly affected by the algorithm. For test curves with different slopes, the traditional gradient extremum method is a common technique for feature point extraction, and this method relies heavily on the smoothness of the curve, because it is easy to produce The inflection point is misjudged, so it is not suitable for extracting the inflection point of the online test curve containing noise signal
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[0048] The following is attached figure 1 , attached figure 2 , attached image 3 And attached Figure 4 The present invention is further described.
[0049] The present invention a kind of inflection point spacing calculation method based on the industrial test curve of dual-path Radon transformation, specifically comprises the following steps:
[0050] Step 1: Use the industrial testing device to conduct online testing on the tested product, and save the test data through the host computer;
[0051] Step 2: import the test data into the LabVIEW software platform for display, generate a test curve, save the test curve into an image format and name it 1.JPG;
[0052] Step 3: According to the linear Radon transform formula, establish a dual-path Radon transform model
[0053] in the parameter field Next, the formula for linear Radon transformation of f(x,y) along the path L: y=px+τ is:
[0054]
[0055] In the formula, δ is the Dirac function; v is the vertical distan...
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The invention discloses a dual-path radon transformation based test curve inflection point interval calculating method. By means of a LabView software platform, industrial detection data are generated into a test curve, the test curve is subjected to dual-path radon transformation to fit multiple sections of smooth and regular straight lines, all inflection points of the fit straight lines are gotten by means of an intersecting line relationship, and intervals between adjacent inflection points are calculated. The dual-path radon transformation based test curve inflection point interval calculating method is small in the dependency on smoothness of the curve, and suitable for extracting inflection points of noisy industrial test curves with complicated characteristics; the calculation method is capable of simultaneously performing radon projection transformation on two paths and has a halved counting period and improved operating efficiency by comparison to a linear radon method; compared with traditional algorithms, the calculating method has the advantages that calculation errors are reduced by over ten times, identification accuracy is high, robustness is good, and the calculating method is convenient to achieve. When an industrial test system detects complicated data, the dual-path radon transformation based test curve inflection point interval calculating method can meet the requirement of industrial monitoring and fine detecting.
Description
technical field [0001] The invention belongs to the technical field of automatic detection and relates to a method for calculating the distance between inflection points of a test curve based on dual-path Radon transformation, which is applicable to the extraction of inflection points and the calculation of the distance between inflection points of industrial test curves with multi-slope characteristics. Background technique [0002] The online test curve in industrial testing is a quantitative embodiment that reflects product performance, and the calculation accuracy of the inflection point distance of the test curve directly reflects the accuracy of product test results. Under the influence of factors such as external interference signals, the industrial test curve is several segments of approximate straight lines with low-frequency noise signals and blurred inflection points, and the smoothness is very poor. The inflection point extraction accuracy of the test curve is gr...
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IPC IPC(8): G06T7/00
Inventor 王中宇江文松
Owner BEIHANG UNIV
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