Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Differential Staining Technique

Differential Staining Technique

Differential staining is an essential microbiological technique that exploits variations in cell wall structures to classify and identify microorganisms. It facilitates the distinction of bacteria, aiding in diagnostic and research applications. Two of the most widely used differential staining methods are Gram staining and acid-fast staining, both of which rely on the chemical and structural differences in bacterial cell walls.Gram Staining TechniqueGram staining differentiates bacteria by...

Gradient Fields

Gradient Fields

A gradient field is a vector field derived from a scalar field. A scalar field assigns a single numerical value to every point in space, such as temperature, pressure, or electric potential. The gradient field describes how that value changes from point to point. It gives both the direction of the fastest increase and the rate of change in that direction.For a scalar field f(x, y), the gradient is written as\begin{equation*}\nabla f=\left\langle \jfrac{\partial f}{\partial x},\jfrac{\partial...

You might also read

Related Articles

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

Sort by

Same author

Interferometric model for phase analysis in fiber couplers.

Applied optics·2010

Same author

Iterative image processing using a cavity with a phase-conjugate mirror.

Applied optics·2010

Same author

Positive pulse switching in coupled nonlinear Fabry-Perot cavities.

Applied optics·2010

Same author

Distortion-free imaging through inhomogeneities by selective spatial filtering.

Applied optics·2010

Same author

Incoherent bandpass spatial filtering with longitudinal periodicity.

Applied optics·2010

Same author

Real time moire interferometry using a Fabry-Perot cavity with a phase conjugate mirror.

Applied optics·2010

Search research articles

Related Experiment Video

Updated: Jun 16, 2026

Applying Hyperspectral Reflectance Imaging to Investigate the Palettes and the Techniques of Painters

Applying Hyperspectral Reflectance Imaging to Investigate the Palettes and the Techniques of Painters

Published on: June 18, 2021

Production of color coded equidensities using nonlinear filtering.

|February 20, 2010

Summary

This study introduces an optical method using halftone screening and theta modulation to create color-coded density maps from continuous-tone images. This technique allows for adaptable density levels and easy color coding of processed outputs.

Area of Science:

Optics and Photonics
Image Processing

Background:

Continuous-tone images contain a wide range of density values.
Representing specific density ranges (equidensities) is crucial for image analysis.
Existing methods for generating equidensities can be complex or lack flexibility.

Purpose of the Study:

To present a novel optical method for generating color-coded equidensities.
To enable independent encoding of density slices using theta modulation.
To facilitate adaptable density levels and easy color addition to outputs.

Main Methods:

Utilizes a halftone screen technique for density encoding.
Employs theta modulation to independently encode each density slice.
Demodulates the coded image using spatial filtering with a polychromatic extended source.

Related Experiment Videos

Last Updated: Jun 16, 2026

Applying Hyperspectral Reflectance Imaging to Investigate the Palettes and the Techniques of Painters

Applying Hyperspectral Reflectance Imaging to Investigate the Palettes and the Techniques of Painters

Published on: June 18, 2021

Main Results:

Successfully generates a family of color-coded equidensities from continuous-tone inputs.
The method allows for adaptation of the number of slices and their density levels.
Color coding is easily integrated into the processed output.

Conclusions:

The presented optical method offers a flexible and efficient way to generate color-coded equidensities.
The technique simplifies the process of isolating and visualizing specific density ranges in images.
This approach has potential applications in various fields requiring density-based image analysis.