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

Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

14.4K
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...
14.4K
Feedback Inhibition00:46

Feedback Inhibition

57.4K
Biochemical reactions are occurring constantly in cells, converting starting substances to different products, usually with the help of enzymes that speed the reactions. Without enzymes, it would take far too long for most reactions to occur to be useful to the cell!
57.4K
Retrieval01:12

Retrieval

456
Retrieval is the process of getting information out of memory storage and back into conscious awareness. This ability is essential for daily tasks like brushing hair and teeth, driving to work, and performing job duties. Retrieval occurs in three ways: recall, recognition, and relearning.
Recall involves accessing information without cues, such as during an essay test, where individuals must retrieve facts and concepts from memory unaided. Another example is remembering the name of a colleague...
456
Feedback Loops01:01

Feedback Loops

64.8K
In most cases, excessive hormone production is prevented by negative feedback—a loop that starts with a stimulus inducing the release of a particular substance, like a hormone, to maintain a certain level before triggering a signal that results in a decrease in further release of the hormone.
64.8K
ER Retrieval Pathway01:45

ER Retrieval Pathway

4.9K
In the secretory pathway, vesicles transport proteins from one cellular compartment to another in forward transport to deliver the protein to its correct location. Occasionally, misfolded proteins and incorrect proteins escape their original compartments, and a retrieval pathway is used to return the escaped proteins to their original compartment.
The ER uses many checkpoints to prevent the entry of incorrectly folded or a resident protein as cargo onto a transport vesicle. These mechanisms...
4.9K
Self-Evaluation: Self-Enhancement and Self-Verification03:00

Self-Evaluation: Self-Enhancement and Self-Verification

5.8K
Social psychologists have documented that feeling good about ourselves and maintaining positive self-esteem is a powerful motivator of human behavior (Tavris & Aronson, 2008). In the United States, members of the predominant culture typically think very highly of themselves and view themselves as good people who are above average on many desirable traits (Ehrlinger, Gilovich, & Ross, 2005). Often, our behavior, attitudes, and beliefs are affected when we experience a threat to our...
5.8K

You might also read

Related Articles

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

Sort by
Same author

Design and Analysis of the Dual-Band Far-Field Super-Resolution Metalens with Large Aperture.

Nanomaterials (Basel, Switzerland)·2024
Same author

Ultra short term power load forecasting based on the fusion of Seq2Seq BiLSTM and multi head attention mechanism.

PloS one·2024
Same author

An efficient genetic transformation system mediated by Rhizobium rhizogenes in fruit trees based on the transgenic hairy root to shoot conversion.

Plant biotechnology journal·2024
Same author

Notoginsenoside R1 targets PPAR-γ to inhibit hepatic stellate cell activation and ameliorates liver fibrosis.

Experimental cell research·2024
Same author

Investigating the epidemiological relevance of secretory otitis media and neighboring organ diseases through an Internet search.

PeerJ·2024
Same author

Untargeted urine metabolomics and machine learning provide potential metabolic signatures in children with autism spectrum disorder.

Frontiers in psychiatry·2024

Related Experiment Video

Updated: Feb 15, 2026

Contrast Enhanced Vessel Imaging using MicroCT
05:50

Contrast Enhanced Vessel Imaging using MicroCT

Published on: January 27, 2011

13.2K

Enhancing imaging contrast via weighted feedback for iterative multi-image phase retrieval.

Cheng Guo1, Qiang Li1, Xiaoqing Zhang2

  • 1Harbin Institute of Technology, Department of Automatic Test and Control, Harbin, China.

Journal of Biomedical Optics
|February 2, 2018
PubMed
Summary

Weighted feedback enhances iterative phase retrieval (IPR) for faster, high-contrast imaging. This method overcomes speckle noise in partially coherent illumination, improving image quality in lensless and lens-based systems.

Keywords:
computational imagingdiffractive opticsimage reconstructionphase retrieval

More Related Videos

Phase Contrast Magnetic Resonance Imaging in the Rat Common Carotid Artery
07:02

Phase Contrast Magnetic Resonance Imaging in the Rat Common Carotid Artery

Published on: September 5, 2018

9.9K
Phase Contrast and Differential Interference Contrast DIC Microscopy
06:49

Phase Contrast and Differential Interference Contrast DIC Microscopy

Published on: August 6, 2008

54.1K

Related Experiment Videos

Last Updated: Feb 15, 2026

Contrast Enhanced Vessel Imaging using MicroCT
05:50

Contrast Enhanced Vessel Imaging using MicroCT

Published on: January 27, 2011

13.2K
Phase Contrast Magnetic Resonance Imaging in the Rat Common Carotid Artery
07:02

Phase Contrast Magnetic Resonance Imaging in the Rat Common Carotid Artery

Published on: September 5, 2018

9.9K
Phase Contrast and Differential Interference Contrast DIC Microscopy
06:49

Phase Contrast and Differential Interference Contrast DIC Microscopy

Published on: August 6, 2008

54.1K

Area of Science:

  • Computational imaging
  • Optical microscopy
  • Image reconstruction

Background:

  • Iterative phase retrieval (IPR) is a computational method for complex-valued sample reconstruction.
  • Speckle noise from laser illumination degrades image quality in IPR.
  • Partially coherent illumination has been used to mitigate speckle noise.

Purpose of the Study:

  • To introduce a weighted feedback modality for multidistance and multiwavelength phase retrieval.
  • To achieve high-contrast and fast imaging using IPR.
  • To improve image quality and accelerate convergence in IPR under challenging illumination conditions.

Main Methods:

  • Application of weighted feedback to multidistance and multiwavelength iterative phase retrieval.
  • Simulations to evaluate convergence acceleration under partially coherent and speckle illumination.
  • Experimental validation using lensless and lens-based systems with resolution charts and biological specimens.

Main Results:

  • Weighted feedback significantly accelerates convergence in IPR simulations.
  • High-contrast and fast imaging was achieved in experimental setups.
  • Successful reconstruction of resolution charts and biological specimens demonstrated the method's performance.
  • The technique proved effective in both lensless and lens-based imaging systems.

Conclusions:

  • Weighted feedback provides a simple and effective modality for high-contrast iterative phase retrieval.
  • The method facilitates compact and flexible experimental implementations for label-free imaging.
  • This approach enhances IPR performance, particularly in overcoming speckle noise and improving imaging speed.