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

Linear Approximation in Frequency Domain

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.

You might also read

Related Articles

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

Sort by

Same author

Functional additives in fishmeal-replaced aquafeeds: precision strategies for sustainable aquaculture.

Journal of animal science and biotechnology·2026

Same author

Dietary riboflavin blocks the cGAS-STING pathway to curb hypoxia-induced hepatic inflammation in sub-adult grass carp (<i>Ctenopharyngodon idella</i>).

Animal nutrition (Zhongguo xu mu shou yi xue hui)·2026

Same author

Taurine supplementation in fish meal-free diet improved growth, alleviated hypoxic-induced gill injury associating with Ca<sup>2+</sup> homeostasis and endoplasmic reticulum stress in sub-adult grass carp (<i>Ctenopharyngodon idella</i>).

Animal nutrition (Zhongguo xu mu shou yi xue hui)·2026

Same author

Analyzing the effect of dietary isoleucine on characterization of flesh flavor using a combination method of E-tongue, E-nose, and GC-MS.

Food chemistry·2026

Same author

Dietary coated sodium selenite enhances muscle growth associated with mitochondrial function in sub-adult grass carp (<i>Ctenopharyngodon idellus</i>).

Animal nutrition (Zhongguo xu mu shou yi xue hui)·2026

Same author

Acute hypoxia induces liver mitochondrial and endoplasmic reticulum stress in adult grass carp (<i>Ctenopharyngodon idella</i>): Palliative effects of vitamin A.

Animal nutrition (Zhongguo xu mu shou yi xue hui)·2026

Search research articles

Related Experiment Video

Updated: Jul 16, 2026

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Published on: March 20, 2017

DualCDM: Dual-Domain Conditional Diffusion for SAR-to-Optical Translation with Spatial-Frequency Correlation and

Yaobin Ma^1,2, Hossein Aghababaei², Ling Chang²

¹Institute of Space Science and Technology, Nanchang University, Nanchang 330031, China.

Sensors (Basel, Switzerland)

|July 15, 2026

Summary

This study introduces dualCDM, a novel conditional diffusion model for translating Synthetic Aperture Radar (SAR) images to optical images. dualCDM enhances radiometric accuracy and spectral consistency by jointly using spatial and frequency domains.

Keywords:

SAR-to-optical conditional diffusion model dual-domain image translation

More Related Videos

Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform

Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform

Published on: February 12, 2014

Dual-Color Fluorescence Cross-Correlation Spectroscopy to Study Protein-Protein Interaction and Protein Dynamics in Live Cells

Dual-Color Fluorescence Cross-Correlation Spectroscopy to Study Protein-Protein Interaction and Protein Dynamics in Live Cells

Published on: December 11, 2021

Related Experiment Videos

Last Updated: Jul 16, 2026

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Published on: March 20, 2017

Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform

Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform

Published on: February 12, 2014

Dual-Color Fluorescence Cross-Correlation Spectroscopy to Study Protein-Protein Interaction and Protein Dynamics in Live Cells

Dual-Color Fluorescence Cross-Correlation Spectroscopy to Study Protein-Protein Interaction and Protein Dynamics in Live Cells

Published on: December 11, 2021

Area of Science:

Remote Sensing
Computer Vision
Signal Processing

Background:

Translating Synthetic Aperture Radar (SAR) to optical imagery is challenging due to differing physical properties captured by microwave backscatter and optical reflectance.
Existing frequency-domain diffusion models have limited ability to model interactions between neighboring frequencies and feature channels.
Independent weighting of Fourier coefficients in prior methods restricts comprehensive frequency-domain analysis.

Purpose of the Study:

To develop a conditional diffusion model, dualCDM, that effectively translates SAR images into optical images.
To jointly exploit spatial and frequency-domain representations for improved translation accuracy.
To enhance the modeling of interactions among neighboring frequencies and feature channels in the translation process.

Main Methods:

Proposed dualCDM, a conditional diffusion model integrating spatial and frequency-domain information.
Introduced a spatial-frequency hybrid residual block (SFHRB) with complex-valued convolutions in the Fourier domain.
Developed an adaptive frequency-domain feature recalibration block (AFFRB) for input-dependent recalibration of frequency responses.

Main Results:

dualCDM demonstrated improved radiometric accuracy, spectral consistency, and structural preservation compared to six existing methods on SEN1-2 and S1S2 datasets.
Experiments showed significant improvements across all six evaluation metrics when compared to the strongest competing method.
The S1S2 dataset was created using Sentinel-2 reflectance data, preserving original value ranges and including the near-infrared band.

Conclusions:

The proposed dualCDM effectively addresses the limitations of previous methods in SAR to optical image translation.
Joint exploitation of spatial and frequency domains significantly enhances translation quality.
dualCDM offers a robust solution for generating accurate and spectrally consistent optical imagery from SAR data.