Related Experiment Video
Updated: Apr 9, 2026
08:42
Measurement of the Directional Information Flow in fNIRS-Hyperscanning Data using the Partial Wavelet Transform Coherence Method
Published on: September 3, 2021
3.7K
Wavelet-based visual compass
Stefan Meyer1, James C Knight1, Alexander Dewar2
1Sussex AI, School of Engineering and Informatics, University of Sussex, Brighton, United Kingdom.
Plos One
|April 7, 2026
Summary
Ants use visual snapshots for navigation. Pre-processing images with Haar wavelets improves route following robustness, even with environmental changes, by highlighting distant objects.
Area of Science:
- Biomimetics
- Neuroscience
- Robotics
Background:
- Ants are exceptional visual navigators, inspiring biomimetic robotics.
- Visual compass-style snapshot models use stored images for route following.
- Haar wavelets pre-processing enhances snapshot robustness.
Purpose of the Study:
- Investigate properties and limits of bearing recovery using visual navigation.
- Compare wavelet-processed, edge-processed, and raw images under perturbations.
- Analyze localized spatial-frequency encodings for route following.
Main Methods:
- Utilized Haar wavelets for image pre-processing.
- Compared image resolutions and processing techniques (wavelets, edge, raw).
- Assessed performance under naturalistic environmental perturbations.
Main Results:
- High-frequency wavelet coefficients highlight distant objects.
- Resolution decrease blurs distant objects, diminishing wavelet effectiveness.
- Environmental perturbations are compensated by appropriate image processing.
Conclusions:
- Localized spatial frequency analysis is crucial for robust snapshot navigation.
- Image processing choice significantly impacts navigation accuracy and resilience.
- Findings advance understanding of ant navigation and robotic applications.
Related Concept Videos
01:12Design Example: Marking Boundaries of a Site Using a Compass
340
Marking site boundaries using a compass is a precise surveying technique that ensures the accuracy of boundary delineation. The process begins by using provided site details, including the bearings and lengths of each boundary line. The initial step involves calculating latitudes and departures for all sides of the site. This computation verifies that the traverse is free of errors, ensuring a closed and accurate boundary.The process starts at a known point, such as Point A, which is often...
340
01:23Compass
15.0K
The compass is a fundamental instrument that operates by aligning its magnetic needle with Earth's magnetic field. This alignment facilitates navigation and orientation, offering a means to determine direction relative to magnetic north. However, the magnetic needle points to magnetic north, which differs slightly from true geographic north due to magnetic declination, which is the angular deviation between these two points. Declination varies based on geographic location and shifts over time...
15.0K
01:19Azimuths and Bearings
956
Azimuths and bearings are essential concepts in surveying, providing methods to express the direction of a line relative to a meridian. Azimuths refer to the clockwise angle measured from the north end of a reference meridian to the given line, ranging from zero to 360 degrees. This method gives a comprehensive directional reference within a full 360-degree circle, making it a straightforward way to communicate direction in various fields, including navigation, cartography, and...
956
01:27Curvilinear Motion: Polar Coordinates
1.2K
In polar coordinates, the motion of a particle follows a curvilinear path. The radial coordinate symbolized as 'r,' extends outward from a fixed origin to the particle, while the angular coordinate, 'θ,' measured in radians, represents the counterclockwise angle between a fixed reference line and the radial line connecting the origin to the particle.
The particle's location is described using a unit vector along the radial direction. Deriving the particle's position...
The particle's location is described using a unit vector along the radial direction. Deriving the particle's position...
1.2K
01:34Velocity and Position by Graphical Method
11.2K
Velocity and position can be calculated from the known function of acceleration as a function of time. The total area under the acceleration-time graph and the velocity-time graph gives the change in velocity and position, respectively. In the case of an airplane, its acceleration is tracked using the inertial navigation system. The pilot provides the input of the airplane's initial position and velocity before takeoff. The inertial navigation system then uses the acceleration data to...
11.2K
01:24Polar Coordinates
565
The polar coordinate system offers an alternative to the Cartesian coordinate system for specifying points in a plane, using a distance and an angle instead of x and y coordinates. This system is particularly advantageous in situations involving circular or rotational symmetry, such as in physics or engineering problems involving waves, oscillations, or orbital paths.Defining Polar CoordinatesIn polar coordinates, a point is represented as P(r, ��), where r is the radial distance...
565