Underwater scale measurement method and device

Abstract

The invention discloses an underwater scale measurement method and an underwater scale measurement device. The underwater scale measurement method comprises the following steps: determining a shootingsurface and a target surface; obtaining an intersection line and an included angle of the two surfaces according to the shooting surface and the target surface; selecting a distance between any two points as a test target point; acquiring an imaging point of the test target point on the shooting surface; and calculating the distance between the target points according to the intersection line ofthe two surfaces, the included angle and the imaging point. The shooting surface and the target surface are determined; coordinates are established according to the shooting surface and the target surface, an equation of a shooting surface and a target surface; an intersection line and an included angle between the shooting surface and the target surface are calculated according to an equation ofthe shooting surface and the target surface; meanwhile, imaging point coordinates of a target point are obtained; according to a point-to-line distance formula, the distance between a target point anda shooting surface is calculated, then the distance between imaging points is calculated according to the point-to-point distance formula, and finally the distance between the two target points is calculated according to the formula, so the function of measuring the size of the target without directly facing the target is realized.

Description

technical field [0001] The invention relates to the field of scale measurement, in particular to an underwater scale measurement method and a device thereof. Background technique [0002] In recent years, with the development of the ocean, there are more and more underwater buildings, and the detection of underwater buildings is becoming more and more important. It can replace human beings to do dangerous behaviors, and it can also perform long-term detection and obtain continuous data, so as to effectively take countermeasures. [0003] However, the current detection of underwater buildings has the following defects: (1) After discovering defects in underwater buildings, the size and scale of the defective target cannot be directly evaluated; The parallel measurement data is only valuable if the target is not facing the target, especially when the underwater tunnel is tested, the tunnel is not a plane, and the conventional laser measurement method will cause a large error....

AI Technical Summary

Problems solved by technology

[0003] However, the current detection of underwater buildings has the following defects: (1) After discovering defects in underwater buildings, the size and scale of the defective target cannot be directly evaluated; It is valuable to measure the data parallel to the plane. If it is not facing the target directly, it will cause a large error. Especially when conducting a permanent inspection of an underwater tunnel, the tunnel is not a plane, and the conventional laser measurement method will cause a large error.

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