Shallow water heritage photographic measurement device and measurement method thereof

Abstract

The invention discloses a shallow water heritage photographic measurement device and a measurement method thereof. The shallow water heritage photographic measurement device comprises a high dorsal fin fish-shaped body, the upper half part is a water inlet cabin, the top of the water inlet tank is internally provided with an elastic air bag, the lower half part of the fish-shaped body is a device cabin, two slopes of a bottom plate of the device cabin are respectively provided with a camera, the photographing directions of the two cameras are orthogonal with the two slopes at the bottom part of the device cabin and are inclined towards the left side and the right side, and the purposes of achieving inclined photographing and acquiring side data of a three-dimensional object through a sealed and transparent photographing window are achieved. The tail part of the fish-shaped body is provided with a horizontal tail fin and a vertical tail fin for keeping directional stability of the fish-shaped body during an advancing photographing process. A high towing hook and a low towing hook are arranged in front of the fish-shaped body for being tied to a traction rope and tied to a general cable at the same interval. The whole set of system is towed forwardly at a low speed through two ends of the general cable, a measured area is passed linearly, and underwater target photographing is realized; and the same measured area is passed again in a right angle direction, each side surface of the target is photographed, and panoramic photographing is realized.

Description

technical field [0001] The invention belongs to the field of underwater photogrammetry detection. Background technique [0002] Shallow water contains a large number of human and natural heritage, including underwater human architectural sites and relics, as well as natural heritage sites or environmental protection areas such as coral reefs, lagoons, and freshwater lakes, which require regular monitoring and protection. [0003] There are many methods of underwater mapping, including sonar, laser, underwater photogrammetry, etc. Among them, sonar has a long range but low accuracy, which is more suitable for measuring large areas of deep water areas; underwater photogrammetry has high accuracy, low operating costs, and high requirements for light intensity, so it is suitable for shallow water area measurements. Generally speaking, in shallow water areas such as lagoons, the maximum water depth usually does not exceed 10 meters, and the natural light intensity meets the requ...

AI Technical Summary

Problems solved by technology

[0008] The problem with the three current underwater photogrammetry methods is that human swimming affects the camera’s posture stability during continuous shooting.

The main problem with installing underwater cameras on ships for photogrammetry is that the stability of the small boat itself is poor, and it is easy to shake, while the shadow area of ​​a slightly larger ship is too large, which has a serious impact on the appearance of the color data results of photogrammetry

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