CN-121297774-B - Angle measurement method and system for culvert construction in high-altitude area

CN121297774BCN 121297774 BCN121297774 BCN 121297774BCN-121297774-B

Abstract

The invention relates to the technical field of image processing, in particular to an angle measurement method and system for culvert construction in a high-altitude area. After the method collects the laser spot images reflected by the total station, the real spot center point is screened out. And connecting the two real light spot center points, and determining a light spot overlapping area by analyzing the change of the brightness value. And carrying out attenuation simulation on pixel points in the overlapping area of the light spots based on a brightness value attenuation rule embodied by the center point of each real light spot, and determining a simulated brightness value. And combining the two simulated brightness values, adjusting the brightness values of the pixels in the overlapping region of the light spots according to the information such as the distance and the like, then performing spot region fitting to obtain an infrared light spot region, and performing culvert construction angle measurement. According to the invention, the information of the infrared light spot area is more referential by eliminating the influence of the brightness of the overlapping area in the infrared light spot area, so that the accuracy of the total station in measuring the culvert construction angle of the high-altitude area is improved.

Inventors

SUN WEI
Cui Zhaohu
CHEN ZHIRU
Cheng Jianxing
LUO MEI
BAI GUANGTAO
WU YAO
LI XINGEN

Assignees

衡水烨通建设工程有限公司

Dates

Publication Date: 20260512
Application Date: 20251120

Claims (9)

1. An angle measurement method for culvert construction in a high altitude area, the method comprising: The method comprises the steps of obtaining a laser spot image of the total station after being reflected by a target point, screening a real spot center point from the laser spot image according to brightness value characteristics; Taking a connecting line between the center points of the real light spots as a first connecting line to be analyzed, scanning the first connecting line to be analyzed along the direction of the perpendicular bisector, screening out pixel points of the light spot overlapping area according to the brightness value change trend in each scanning, and obtaining the light spot overlapping area; for any one spot overlapping region pixel point, connecting the corresponding real spot center points to obtain two calibration connecting lines, and for any one calibration connecting line, obtaining the simulated brightness value of the spot overlapping region pixel point according to the brightness decreasing rule of the real spot center point and the length of the calibration connecting line; Respectively obtaining the brightness difference between two simulated brightness values and the actual brightness value of the pixel point of the light spot overlapping area, obtaining a distance weight according to the length of a calibration connecting line, and carrying out weighted fusion on the brightness difference according to the distance weight to obtain corrected brightness; Performing spot area fitting according to the adjusted laser spot image, and performing angle measurement according to the obtained infrared spot area; the method for acquiring the real light spot center point comprises the following steps: And screening each pixel point in the laser spot image based on the brightness value, taking all the maximum values in the laser spot image as suspected spot center points, taking the connecting line between every two suspected spot center points as a second connecting line to be analyzed, analyzing brightness value change characteristics between two end points on the second connecting line to be analyzed, and screening out real spot center points from the suspected spot center points.
2. The angle measurement method for culvert construction in high altitude areas according to claim 1, wherein the step of screening out the true light spot center point from the suspected light spot center points comprises the steps of: And in the brightness value sequence, subtracting the latter element from the former element to obtain a differential sequence, and taking the suspected facula central point corresponding to the starting point as the real facula central point if the number of positive number elements in the differential sequence is greater than a preset first threshold value.
3. The angle measurement method for culvert construction in high altitude areas according to claim 2, wherein the method for screening the light spot overlapping area pixels comprises the following steps: and obtaining normal light spot pixel points corresponding to two end points of the first connecting line to be analyzed, removing the normal light spot pixel points to obtain a intercepted line segment, wherein the pixel points on the intercepted line segment are the light spot overlapping area pixel points.
4. The angle measurement method for culvert construction in high altitude areas according to claim 3, wherein the stopping condition of the scanning is: and taking the initial position of the first connecting line to be analyzed as a starting position, scanning along the perpendicular bisectors in two directions of the perpendicular bisectors, and stopping scanning until the length of the intercepted line segment is smaller than a preset second threshold value in each scanning direction.
5. The angle measurement method for culvert construction in high altitude areas according to claim 1, wherein the method for obtaining the brightness decreasing rule comprises the following steps: And obtaining a brightness value difference value between a real light spot center point corresponding to the calibration connecting line and the transition point, wherein the brightness value difference value is used as a numerator, and the distance between the real light spot center point and the transition point is used as a denominator, so as to obtain the brightness decreasing rule.
6. The angle measurement method for culvert construction in high altitude areas of claim 5, wherein the method for obtaining the simulated brightness value comprises: and for each calibration connecting line, taking the product of the length of the calibration connecting line and the brightness decreasing rule as a brightness attenuation analog value, and subtracting the brightness attenuation analog value from the brightness value of the corresponding real light spot center point to obtain the analog brightness value.
7. The angle measurement method for culvert construction in high altitude areas according to claim 1, wherein the corrected brightness obtaining method comprises: And carrying out negative correlation mapping and normalization on the length of any calibration connecting line to obtain the distance weight, and carrying out weighted summation on the brightness difference and the corresponding distance weight to obtain the corrected brightness.
8. The angle measurement method for culvert construction in high altitude areas according to claim 1, wherein the method for obtaining the basic brightness value comprises the following steps: and multiplying the distance weight corresponding to the reference point by the analog brightness value to obtain the basic brightness value.
9. An angle measurement system for culvert construction in high altitude areas, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor, when executing the computer program, realizes the steps of an angle measurement method for culvert construction in high altitude areas according to any one of claims 1-8.

Description

Angle measurement method and system for culvert construction in high-altitude area Technical Field The invention relates to the technical field of image processing, in particular to an angle measurement method and system for culvert construction in a high-altitude area. Background The general equipment used for measuring the angle of the culvert construction is a total station, when the total station is used for measurement by using a polar coordinate method, whether the included angle between the axis of the culvert and the central line of the route is orthogonal needs to be judged, and in the culvert construction, the measurement and judgment are also carried out in time, the construction position is preset in advance, and whether the angle accords with a preset value when the culvert is designed or not is judged after the construction. In the prior art, in the process of using the total station to measure angles, the direct light irradiation area is generally selected to avoid the angle measurement or the influence of shielding object to reduce the ambient light is utilized, but in the high-altitude environment, the light intensity is higher, the scattering degree of natural light is lower, the influence of strong light cannot be completely avoided when the total station receives reflected light, the receiving camera can not only receive self-emitted infrared rays, but also be influenced by other light such as sunlight, a plurality of light spots are formed by receiving, the measurement of the total station is influenced by the overlapped special-shaped light spots, and the data precision obtained by the camera has errors. Disclosure of Invention In order to solve the technical problems that in the prior art, in the culvert construction angle measurement process of a high-altitude area by using a total station, strong light influence cannot be avoided, so that feedback facula areas overlap, and effective facula areas cannot be determined, and further real measurement accuracy is influenced, the invention aims to provide an angle measurement method and system for culvert construction of the high-altitude area, and the adopted technical scheme is as follows: The invention provides an angle measurement method for culvert construction in a high-altitude area, which comprises the following steps: The method comprises the steps of obtaining a laser spot image of the total station after being reflected by a target point, screening a real spot center point from the laser spot image according to brightness value characteristics; Taking a connecting line between the center points of the real light spots as a first connecting line to be analyzed, scanning the first connecting line to be analyzed along the direction of the perpendicular bisector, screening out pixel points of the light spot overlapping area according to the brightness value change trend in each scanning, and obtaining the light spot overlapping area; for any one spot overlapping region pixel point, connecting the corresponding real spot center points to obtain two calibration connecting lines, and for any one calibration connecting line, obtaining the simulated brightness value of the spot overlapping region pixel point according to the brightness decreasing rule of the real spot center point and the length of the calibration connecting line; Respectively obtaining the brightness difference between two simulated brightness values and the actual brightness value of the pixel point of the light spot overlapping area, obtaining a distance weight according to the length of a calibration connecting line, and carrying out weighted fusion on the brightness difference according to the distance weight to obtain corrected brightness; and carrying out spot area fitting according to the adjusted laser spot image, and carrying out angle measurement according to the obtained infrared spot area. Further, the method for acquiring the center point of the real light spot comprises the following steps: And screening each pixel point in the laser spot image based on the brightness value, taking all the maximum values in the laser spot image as suspected spot center points, taking the connecting line between every two suspected spot center points as a second connecting line to be analyzed, analyzing brightness value change characteristics between two end points on the second connecting line to be analyzed, and screening out real spot center points from the suspected spot center points. Further, the screening the true light spot center point from the suspected light spot center points includes: And in the brightness value sequence, subtracting the latter element from the former element to obtain a differential sequence, and taking the suspected facula central point corresponding to the starting point as the real facula central point if the number of positive number elements in the differential sequence is greater than a preset first threshold value. Further, the method f