A comparative analysis between active and passive techniques for underwater 3D reconstruction of close-range objects.

Area of Science:

• Marine Biology
• Underwater Archaeology
• 3D Imaging Technologies

Background:

• Collecting 3D data underwater is crucial for fields like marine biology and archaeology.
• Existing 3D imaging techniques are often used for close-range underwater acquisitions.

Purpose of the Study:

• To compare the performance of active and passive 3D imaging techniques in underwater environments.
• To evaluate their capability in acquiring 3D points under varying turbidity conditions.

Main Methods:

• Two whole-field, stereo-configured 3D imaging techniques (active and passive) were compared.
• A laboratory setup simulated poor visibility using clay suspension in a water tank.
• Acquisition parameters like setup, working distance, and calibration were kept consistent.

Main Results:

• The study evaluated the accuracy and density of 3D points acquired by both techniques.
• Preliminary analysis focused on their performance in turbid water conditions.
• Results provide a baseline for comparing 3D techniques in challenging aquatic environments.

Conclusions:

• The comparative analysis provides foundational data on active versus passive 3D imaging in turbid water.
• While not yet for real-world application, the findings guide future research in underwater 3D data acquisition.
• This research serves as a reference for evaluating other 3D techniques and algorithms in similar conditions.