The invention discloses an 
underwater target three-dimensional 
reconstruction method based on line 
structured light. The method includes the following steps that a, an 
underwater two-dimensional image including depth information is acquired; b, enhancement 
processing is conducted on the 
underwater two-dimensional image; c, 
noise reduction 
processing is conducted on the two-dimensional image acquired in the step b; d, 
image edge detecting and image shape 
processing are carried out on the two-dimensional image acquired in the step c, and the center of each 
laser streak is extracted; e, the two-dimensional image acquired in the step d is calibrated; f, three-dimensional coordinates are acquired from the two-dimensional image acquired in the step e; g, the three-dimensional coordinates are reconstructed through computer high-level 
programming languages, namely visual underwater target three-dimensional information is obtained. By means of the underwater target three-dimensional 
reconstruction method based on line 
structured light, the influence on detecting precision because of 
suspended matter in water, light absorbing and scattering by 
seawater, uneven light fields and the like can be effectively lowered, wide-angle and long-distance underwater target three-dimensional 
information extraction is achieved, and underwater long-distance high-precision real-time target three-dimensional detection is realized.