Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category, whereas...
Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
Linear Approximation in Frequency Domain01:26

Linear Approximation in Frequency Domain

Linear systems are characterized by two main properties: superposition and homogeneity. Superposition allows the response to multiple inputs to be the sum of the responses to each individual input. Homogeneity ensures that scaling an input by a scalar results in the response being scaled by the same scalar.
In contrast, nonlinear systems do not inherently possess these properties. However, for small deviations around an operating point, a nonlinear system can often be approximated as linear.
Aliasing01:18

Aliasing

Accurate signal sampling and reconstruction are crucial in various signal-processing applications. A time-domain signal's spectrum can be revealed using its Fourier transform. When this signal is sampled at a specific frequency, it results in multiple scaled replicas of the original spectrum in the frequency domain. The spacing of these replicas is determined by the sampling frequency.
If the sampling frequency is below the Nyquist rate, these replicas overlap, preventing the original signal...
Relative Frequency Histogram01:14

Relative Frequency Histogram

The relative frequency depicts the proportion of data points that have each value. The frequency tells the number of data points that have each value. Like the histogram, a relative frequency histogram also has the same shape with a horizontal scale (the x-axis), but the vertical scale (the y-axis) is marked with relative frequencies (percentages of the whole) instead of actual frequencies. A relative frequency histogram is a graphical representation of a frequency distribution where the...
Color Vision01:24

Color Vision

Color perception begins in the retina, the light-sensitive layer at the back of the eye. Two main theories explain how colors are seen: the trichromatic theory and the opponent-process theory. The trichromatic theory, proposed by Thomas Young in 1802 and extended by Hermann von Helmholtz in 1852, suggests that color vision is based on three types of cone receptors in the retina. These cones are sensitive to different but overlapping ranges of wavelengths corresponding to red, blue, and green.

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

An Episode Memory-Guided Dual-Stage Framework for Long-Form Video Temporal Grounding.

IEEE transactions on image processing : a publication of the IEEE Signal Processing Society·2026
Same author

Geranylgeranylacetone-Induced HSP70 Modulates AQP4 Trafficking via SNX27-Retromer to Alleviate Retinal Ischemia/Reperfusion Injury.

Glia·2026
Same author

PSAvatar: A Point-Based Shape Model for Real-Time Head Avatar Animation With 3D Gaussian Splatting.

IEEE transactions on visualization and computer graphics·2026
Same author

Insights into the dual inhibitory effects of phenylethanoid glycosides from Osmanthus fragrans flower on glycolipid metabolizing enzymes.

Bioorganic chemistry·2025
Same author

Regulation of Melatonin on AQP4 Expression in Brain of SD Newborn Rats with Bilirubin Encephalopathy and Protection Mechanism.

Molecular neurobiology·2025
Same author

Fault Diagnosis of Rolling Bearings Using Denoising Multi-Channel Mixture of CNN and Mamba-Enhanced Adaptive Self-Attention LSTM.

Sensors (Basel, Switzerland)·2025

Related Experiment Video

Updated: Jul 7, 2026

Simultaneous Multicolor Imaging of Biological Structures with Fluorescence Photoactivation Localization Microscopy
12:51

Simultaneous Multicolor Imaging of Biological Structures with Fluorescence Photoactivation Localization Microscopy

Published on: December 9, 2013

Frequency layered color indexing for content-based image retrieval.

Guoping Qiu1, Kin-Man Lam

  • 1School of Computer Science, The University of Nottingham, Nottingham NG8 1BB, UK. qiu@cs.nott.ac.uk

IEEE Transactions on Image Processing : a Publication of the IEEE Signal Processing Society
|February 2, 2008
PubMed
Summary
This summary is machine-generated.

This study introduces a novel image retrieval method that segments images by spatial frequency. This approach enhances retrieval effectiveness by linking low-level features to perceptual significance.

More Related Videos

Multimodal Optical Imaging Platform for Studying Cellular Metabolism
04:47

Multimodal Optical Imaging Platform for Studying Cellular Metabolism

Published on: June 6, 2025

Related Experiment Videos

Last Updated: Jul 7, 2026

Simultaneous Multicolor Imaging of Biological Structures with Fluorescence Photoactivation Localization Microscopy
12:51

Simultaneous Multicolor Imaging of Biological Structures with Fluorescence Photoactivation Localization Microscopy

Published on: December 9, 2013

Multimodal Optical Imaging Platform for Studying Cellular Metabolism
04:47

Multimodal Optical Imaging Platform for Studying Cellular Metabolism

Published on: June 6, 2025

Area of Science:

  • Computer Vision
  • Image Processing
  • Information Retrieval

Background:

  • Image patches with varying spatial frequencies possess distinct perceptual and physical properties.
  • Effective image retrieval necessitates incorporating these properties into indexing strategies.

Purpose of the Study:

  • To develop an image retrieval method that leverages spatial frequency characteristics for improved indexing.
  • To enhance low-level features with high-level perceptual and physical significance.

Main Methods:

  • Image segmentation into layers based on similar spatial frequency characteristics.
  • Individual indexing of layers using simple low-level features.
  • Association of indexing features with perceptual and physical significance.

Main Results:

  • A computationally efficient implementation of the proposed method was developed.
  • The method enhances the power of basic color indexing while maintaining its simplicity.
  • Experimental results demonstrate the effectiveness of the spatial frequency-based image retrieval technique.

Conclusions:

  • The proposed method offers a computationally efficient approach to image retrieval.
  • Implicitly incorporating high-level knowledge into low-level features improves retrieval performance.
  • This technique provides a robust framework for developing more effective image retrieval systems.