National flag detection method based on single image
A detection method and edge detection algorithm technology, applied in the field of geographic information, can solve problems such as difficult flag detection, lack of pentagram geometric models, etc.
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Embodiment 1
[0044] The invention provides a new two-dimensional equation of the pentagram, and a method for reconstructing the pentagram on the national flag and using the newly established model for deformation and displacement detection. At present, to detect the five-pointed star shape and other geometric characteristics of the five-pointed star of the national flag on the plane of the two-dimensional camera sensor, a rigorous mathematical geometric model that can simultaneously bring in model parameters and all observed values is required. But so far, there is no geometric model of the pentagram.
[0045] More specifically, so far, there has not been a long-distance non-contact measurement method that uses the principle of surveying and mapping remote sensing and is specifically aimed at detecting the national flag. The national flag detection method based on a single image proposed by the present invention, combined with a rigorous mathematical geometric model, enables The flag pen...
Embodiment 2
[0055] More specifically, on the basis of Example 1, the step S1 is specifically:
[0056] Let the center coordinates of the five-pointed star be (X C ,Y C ), Z-axis rotation angle Ψ and radius R 0 , then the parameters satisfy the following conversion equation:
[0057]
[0058] Among them, X' and Y' represent the horizontal axis coordinates and vertical axis coordinates converted into the original position, and R 2D (Ψ) represents the rotation matrix of Ψ;
[0059] Position in the first five divisions is governed by the following constraint equations:
[0060] (X'-R 0 )tan(54°)=|Y'|
[0061] Divide the five-pointed star into ten regions, and the points located in different regions will satisfy the constraints of the constraint equation after being rotated by the angle (p-1) 36°+Ψ, where the parameter p is the ten-region division code, specifically defined as:
[0062]
[0063] Among them, Θ(0°≤Θ≤360°) is the polar angle of the point on the X-Y plane; since the ...
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