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Upsampling

Upsampling

Managing signal sampling rates is essential in digital signal processing to maintain signal integrity. A decimated signal, characterized by a reduced frequency range due to its lower sampling rate, can be upsampled by inserting zeros between each sample. This upsampling process expands the original spectrum and introduces repeated spectral replicas at intervals dictated by the new Nyquist frequency. To refine this zero-inserted sequence, it is passed through a lowpass filter with a cutoff...

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Related Experiment Video

Updated: Jan 5, 2026

Video-rate Scanning Confocal Microscopy and Microendoscopy

Video-rate Scanning Confocal Microscopy and Microendoscopy

Published on: October 20, 2011

Sinusoidal Sampling Enhanced Compressive Camera for High Speed Imaging.

Chao Deng, Yuanlong Zhang, Yifeng Mao

IEEE Transactions on Pattern Analysis and Machine Intelligence

|October 12, 2019

Summary

This study introduces Sinusoidal Sampling Enhanced Compressive Camera (S2EC2), a novel method for capturing fast phenomena. S2EC2 significantly boosts frame rates beyond conventional limits, enabling high-speed video reconstruction.

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Video-rate Scanning Confocal Microscopy and Microendoscopy

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Imaging and Quantification of the Area of Fast-Moving Microbubbles Using a High-Speed Camera and Image Analysis

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Published on: September 5, 2020

Area of Science:

Optics and Photonics
Image Processing
Computer Vision

Background:

Compressive sensing enables capturing fast phenomena at higher frame rates than camera sensors.
Conventional compressive video sensing methods are limited to tenfold frame rate improvement and low-resolution recovery.

Purpose of the Study:

To develop a novel compressive video acquisition technique (S2EC2) for significantly enhancing frame rates.
To leverage redundant spatial resolution for improved frame rate capture.

Main Methods:

Decomposition of dense frames into groups for combinational coding.
Application of random codes within groups for compressive acquisition.
Utilizing group-specific sinusoidal codes to multiplex groups onto a high-resolution sensor, shifting frequency components in the Fourier domain.

Main Results:

Successful separation of coded measurements for different groups during reconstruction.
Recovery of dense frames within each group.
Prototype achieved 2000 fps reconstruction with a 15.6 fps camera, demonstrating a compression ratio of 0.009.

Conclusions:

The Sinusoidal Sampling Enhanced Compressive Camera (S2EC2) effectively encodes denser frames within a snapshot.
The developed technique overcomes limitations of conventional methods, enabling high frame rate video acquisition.
Experimental validation confirms the proposed approach's efficacy for capturing fast phenomena.