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Downsampling

Downsampling

When considering a sampled sequence with zero values between sampling instants, one can replace it by taking every N-th value of the sequence. At these integer multiples of N, the original and sampled sequences coincide. This process, known as decimation, involves extracting every N-th sample from a sequence, thereby creating a more efficient sequence.
The Fourier transform of the decimated sequence reveals a combination of scaled and shifted versions of the original spectrum. This...

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Related Experiment Video

Updated: May 13, 2026

High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques

High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques

Published on: December 3, 2013

Genetic method to optimize binary dithering technique for high-quality fringe generation.

William Lohry¹, Song Zhang

¹Department of Mechanical Engineering, Iowa State University, Ames, Iowa 50011, USA.

|March 5, 2013

Summary

This summary is machine-generated.

A new genetic algorithm optimizes dithering for improved fringe quality in optical measurements. This technique enhances both narrow and wide fringe patterns, boosting measurement accuracy.

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Area of Science:

Optics and Photonics
Metrology
Computational Imaging

Background:

Dithering techniques enhance measurement quality in optical systems.
Existing dithering methods show limited improvement for narrow fringe patterns.

Purpose of the Study:

To develop an optimized dithering technique for sinusoidal structured pattern representation.
To improve fringe quality across both narrow and wide fringe patterns.

Main Methods:

A genetic algorithm was employed to optimize the dithering parameters.
Simulations and experimental validations were conducted.

Main Results:

The proposed genetic algorithm significantly improved fringe quality for wide fringe patterns.
Substantial improvements in fringe quality were also observed for narrow fringe patterns.
The optimized dithering technique demonstrated enhanced measurement accuracy.

Conclusions:

The genetic algorithm effectively optimizes dithering for improved fringe quality.
This approach offers a versatile solution for enhancing optical measurements with structured patterns.