Probing pictorial relief: from experimental design to surface reconstruction

Area of Science:

• Visual Perception
• Computational Geometry

Background:

• The gauge figure method is a popular technique for quantifying pictorial relief.
• A detailed, step-by-step description of this method has been lacking in scientific literature.
• Previous applications of the gauge figure method have not explored objects with holes or inner contours.

Purpose of the Study:

• To provide a comprehensive, step-by-step description of the gauge figure method for quantifying pictorial relief.
• To offer accompanying software (PsychToolbox) to facilitate experimental implementation.
• To extend the gauge figure method to analyze pictorial surfaces with holes and inner contours.

Main Methods:

• Detailed description of stimulus and sample preparation.
• Procedure for conducting the gauge figure experiment.
• Method for reconstructing 3-D surfaces from experimental data.
• Extension of the gauge figure method to objects with holes and inner contours.

Main Results:

• A clear, reproducible protocol for the gauge figure method is established.
• Open-source software is provided to aid researchers in implementing the gauge figure task.
• The gauge figure method is successfully adapted for surfaces with holes and inner contours, expanding its applicability.

Conclusions:

• This work demystifies the gauge figure method, making it more accessible to researchers.
• The provided software and detailed protocol will accelerate research in pictorial relief perception.
• The extension of the method to complex surfaces opens new avenues for investigating 3D shape perception.