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Group Design02:01

Group Design

The most basic experimental design involves two groups: the experimental group and the control group. The two groups are designed to be the same except for one difference— experimental manipulation. The experimental group gets the experimental manipulation—that is, the treatment or variable being tested—and the control group does not. Since experimental manipulation is the only difference between the experimental and control groups, we can be sure that any differences between the two are due to...
Design Example01:23

Design Example

The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...
Design Consideration01:22

Design Consideration

Designing a structure involves a series of considerations, primarily the material's ultimate strength, calculated through tests that measure changes under increased force until the material reaches its breaking point or limit. The ultimate load, where the material breaks, is divided by its original cross-sectional area, resulting in the ultimate normal stress or strength. The ultimate shearing stress is another significant factor taken into account.
The factor of safety is another key aspect...
Design Example: Measuring Distance Between Two Points with Obstructions01:10

Design Example: Measuring Distance Between Two Points with Obstructions

When measuring distances in areas with physical obstructions, such as a lake in a field, surveyors must employ techniques to calculate accurate lengths without direct line measurements. One effective method is the offset technique, which allows for precise distance estimation over inaccessible stretches.In this scenario, a surveyor must measure a side of an area that crosses a lake. Since the measuring tape cannot span the lake, the surveyor begins by establishing a baseline that aligns with...
Design Example: Marking Boundaries of a Site Using a Compass01:12

Design Example: Marking Boundaries of a Site Using a Compass

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...
Design Example: Identifying the Locations of Monuments in the Field Using Global Positioning System Device01:30

Design Example: Identifying the Locations of Monuments in the Field Using Global Positioning System Device

Surveyors use Global Positioning System (GPS) technology to measure the precise location and elevation of points on Earth. In a recent survey, GPS receivers were used to determine the coordinates and elevations of two park monuments. The process involved careful mission planning, data collection, and correction to ensure accuracy. The survey began with mission planning to identify optimal satellite visibility and minimize Position Dilution of Precision (PDOP). A geodetic control point served as...

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Related Experiment Video

Updated: Jun 29, 2026

Medical-grade Sterilizable Target for Fluid-immersed Fetoscope Optical Distortion Calibration
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Fiducial Objects: Custom Design and Evaluation.

Pablo García-Ruiz1, Francisco J Romero-Ramirez1,2, Rafael Muñoz-Salinas1,2

  • 1Departamento de Informática y Análisis Numérico, Edificio Einstein, Campus de Rabanales, Universidad de Coŕdoba, 14071 Córdoba, Spain.

Sensors (Basel, Switzerland)
|December 23, 2023
PubMed
Summary
This summary is machine-generated.

This study introduces custom-shaped fiducial markers for improved camera pose estimation. These novel markers enhance space utilization and accuracy, outperforming traditional square markers in robotics and augmented reality applications.

Keywords:
camera pose estimationfiducial markerfiducial object

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Area of Science:

  • Computer Vision
  • Robotics
  • Geometric Measurement

Background:

  • Camera pose estimation is crucial for robotics, medical imaging, and augmented reality.
  • Existing fiducial markers like ArUco and Apriltag have limitations in accuracy and viewing angle when used individually.
  • Custom fiducial objects improve visibility and precision by attaching markers to 3D structures.

Purpose of the Study:

  • To develop novel custom-shaped fiducial markers for enhanced space utilization and detectability.
  • To introduce a precise configuration estimation technique for these custom fiducial objects using multiviewpoint imaging.
  • To provide open-source code, tutorials, and an application for creating and calibrating these objects.

Main Methods:

  • Designing custom-shaped fiducial markers to optimize face coverage on 3D objects.
  • Implementing a multiviewpoint imaging technique for precise object configuration estimation.
  • Conducting empirical analysis to evaluate marker performance under various conditions (noise, blur, scale).

Main Results:

  • Custom-shaped markers demonstrate superior space utilization compared to traditional square markers.
  • The proposed method achieves precise configuration estimation of custom fiducial objects.
  • Empirical results show significant performance improvements of custom markers over traditional ones in pose estimation tasks.

Conclusions:

  • Custom-shaped fiducial markers represent a significant advancement in fiducial marker-based pose estimation.
  • The developed techniques enhance marker detectability, space utilization, and overall pose estimation accuracy.
  • The provided resources facilitate wider adoption and development in related research areas.