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Related Concept Videos

Phase-lead and Phase-lag Controllers01:22

Phase-lead and Phase-lag Controllers

Understanding the working function of different types of controllers can be illustrated with practical analogies, such as adjusting a stereo's volume equalizer. Cranking up the bass involves a phase-lead controller, which functions as a high-pass filter, while increasing the treble uses a phase-lag controller, which acts as a low-pass filter. PD controllers, similar to high-pass filters, enhance the system's response to high-frequency components. PI controllers, akin to low-pass filters, manage...
Time and frequency -Domain Interpretation of Phase-lag Control01:21

Time and frequency -Domain Interpretation of Phase-lag Control

Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any finite,...
The Phase Rule01:20

The Phase Rule

The phase rule describes the relationship between the variance (degrees of freedom), the number of components, and the number of phases in a system at equilibrium.Variance is a concept that denotes the number of independent intensive properties (properties are those that do not depend on the amount of material in the system), such as temperature, pressure, and composition, that can be altered without impacting the number of phases in equilibrium.In a single-component system, such as pure water,...
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...
IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the C=O, C=N, and C=C occur between 1600–1850 cm−1.
The...
Time and frequency -Domain Interpretation of Phase-lead Control01:24

Time and frequency -Domain Interpretation of Phase-lead Control

Phase-lead controllers are commonly used in various control systems to enhance response speed and stability. Adjusting the brightness on a television screen offers a practical example of phase-lead control. When contrast is enhanced, a phase-lead controller is employed. Mathematically, phase-lead control is identified when the first parameter is smaller than the second.
The design of phase-lead control involves the strategic placement of poles and zeros to balance steady-state error and system...

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Detection of Architectural Distortion in Prior Mammograms via Analysis of Oriented Patterns
13:44

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Published on: August 30, 2013

Distortion invariant pattern recognition with phase filters.

J Rosen, J Shamir

    Applied Optics
    |May 22, 2010
    PubMed
    Summary
    This summary is machine-generated.

    New spatial filters focus on phase information for pattern recognition. While recognition accuracy slightly decreased, they offer robust distortion immunity and are compatible with low-resolution devices.

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    Area of Science:

    • Optics and Photonics
    • Image Processing
    • Pattern Recognition

    Background:

    • Traditional spatial filters often require high precision, limiting their application in certain environments.
    • Phase-only filters can reduce tolerance requirements in optical pattern recognition systems.

    Purpose of the Study:

    • To investigate the performance of newly developed spatial filters primarily containing phase information.
    • To assess the trade-offs between recognition accuracy, distortion immunity, and device compatibility.

    Main Methods:

    • Generation of spatial filters with reduced tolerance requirements, emphasizing phase information.
    • Evaluation of recognition levels and distortion immunity using the developed filters.
    • Assessment of filter information content compatibility with low-resolution spatial light modulators.

    Main Results:

    • The developed phase-dominated filters showed decreased recognition levels compared to traditional filters.
    • Adequate recognition performance was maintained for unambiguous identification.
    • Significant immunity to various distortions was observed.
    • The filters' information content is suitable for low-resolution devices such as spatial light modulators.

    Conclusions:

    • Spatial filters dominated by phase information offer a viable approach for pattern recognition.
    • These filters provide a practical balance between recognition capability, distortion tolerance, and hardware compatibility.
    • The findings support the use of phase-only filters in applications with low-resolution optical components.