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Related Concept Videos

Downsampling01:20

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...
Upsampling01:22

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: Jun 29, 2026

Digital Inline Holographic Microscopy DIHM of Weakly-scattering Subjects
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A Low-Rate Video Approach to Hyperspectral Imaging of Dynamic Scenes.

Charles M Bachmann1, Rehman S Eon1, Christopher S Lapszynski1

  • 1Chester F. Carlson Center for Imaging Science, Rochester Institute of Technology, Rochester, NY 14623-5603, USA.

Journal of Imaging
|September 2, 2021
PubMed
Summary

This study introduces a novel hyperspectral imaging system capable of video-rate data acquisition. The integrated system enables rapid collection of hyperspectral image sequences for diverse applications.

Keywords:
Virginia Coast Reserve Long Term Ecological Research (VCR LTER)bi-directional reflectance distribution function (BRDF)coastal dynamicsdigital elevation modelhemispherical conical reflectance factor (HCRF)hyperspectralimagingmoving vehicle imagingstereo imagingvideo

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Area of Science:

  • Remote Sensing
  • Optical Imaging
  • Spectroscopy

Background:

  • Modern hyperspectral line-scanning systems achieve high data rates (200-400 Hz).
  • This enables traditional push-broom systems to function as low-rate video hyperspectral imagers.
  • High-sensitivity imaging is crucial for detailed spectral analysis.

Purpose of the Study:

  • To present the design of an integrated system for low-rate video hyperspectral imaging.
  • To demonstrate the system's capability for multi-view and stereo hyperspectral acquisition.
  • To showcase applications in coastal and urban environments.

Main Methods:

  • Integration of a visible and near-infrared hyperspectral line scanner.
  • Incorporation of a high-speed pan-tilt system for precise pointing.
  • Utilizing an integrated Inertial Measurement Unit (IMU) and Global Positioning System (GPS) for georeferencing.
  • Deployment on a telescopic mast for multi-angle and stereo imaging.

Main Results:

  • Acquisition of hyperspectral image sequences with 371 spectral bands and 16-bit dynamic range.
  • Demonstrated rapid data acquisition rates (e.g., every 0.67 seconds and every second).
  • Successful field experiments in coastal and urban settings, including moving vehicle imaging.

Conclusions:

  • The integrated system effectively produces low-rate video hyperspectral image sequences.
  • The platform supports advanced data acquisition, including bi-directional reflectance and digital elevation model generation.
  • The system shows versatility for various remote sensing and imaging applications.