A Long Exposure Oblique Photography Tunnel Holographic Measurement Method

Abstract

The invention discloses a long-exposure oblique photography tunnel holographic measurement method. The implementation steps of the invention include marking image control points and measuring coordinates when drilling and setting out the tunnel face; collecting different angles and high-resolution images in low-illuminance environments through long-exposure photography Cave body images with high rate and rock texture; for cave body images, by identifying the feature points on multiple cave body images, the space coordinates of feature points are calculated based on the multi-image space forward intersection method, and the points are expanded to form a grid surface model, so as to obtain A digital surface model carrying stratigraphic information and cave profile surface relief. The invention has the advantages of simple equipment, convenient operation, less environmental constraints, full information restoration of the cave body, no influence on the construction in the cave, and wide applicability.

Description

technical field [0001] The invention relates to tunnel section measurement technology, in particular to a long-exposure oblique photography tunnel holographic measurement method. Background technique [0002] Tunnel cross-section measurement is often carried out by total station or laser scanner, both of which use equipment to emit laser light and measure in polar coordinates. The equipment is expensive and can only obtain the surface contour data of the tunnel body, and cannot record geological information and blasting parameters. 1. The laser scattering is serious in the water-rich environment, and the signal return rate is low. The geological survey of the face is still at the stage of geological sketches or local planar images. The subjective influence of geological records is great, and the overall traceability of geological conditions is not strong. "Measuring the section for the sake of measuring the section" essentially ignores the geological properties of the tunne...

AI Technical Summary

Problems solved by technology

[0002] Tunnel cross-section measurement is often carried out by total station or laser scanner, both of which use equipment to emit laser light and measure in polar coordinates. The equipment is expensive and can only obtain the surface contour data of the tunnel body, and cannot record geological information and blasting parameters. , Laser scattering is serious in water-rich environment, and the signal return rate is low

The geological survey of the face is still at the stage of geological sketches or local planar images. The subjective influence of geological records is great, and the overall geological situation is not very traceable.

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