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Related Concept Videos

Deconvolution01:20

Deconvolution

Deconvolution, also known as inverse filtering, is the process of extracting the impulse response from known input and output signals. This technique is vital in scenarios where the system's characteristics are unknown, and they must be inferred from the observable signals.
Deconvolution involves several mathematical techniques to derive the impulse response. One common approach is polynomial division. In this method, the input and output sequences are treated as coefficients of...
Convolution: Math, Graphics, and Discrete Signals01:24

Convolution: Math, Graphics, and Discrete Signals

In any LTI (Linear Time-Invariant) system, the convolution of two signals is denoted using a convolution operator, assuming all initial conditions are zero. The convolution integral can be divided into two parts: the zero-input or natural response and the zero-state or forced response, with t0 indicating the initial time.
To simplify the convolution integral, it is assumed that both the input signal and impulse response are zero for negative time values. The graphical convolution process...
Convolution Properties II01:17

Convolution Properties II

The important convolution properties include width, area, differentiation, and integration properties.
The width property indicates that if the durations of input signals are T1 and T2, then the width of the output response equals the sum of both durations, irrespective of the shapes of the two functions. For instance, convolving two rectangular pulses with durations of 2 seconds and 1 second results in a function with a width of 3 seconds.
The area property asserts that the area under the...
Convolution Properties I01:20

Convolution Properties I

Convolution computations can be simplified by utilizing their inherent properties.
The commutative property reveals that the input and the impulse response of an LTI (Linear Time-Invariant) system can be interchanged without affecting the output:
Inverse z-Transform by Partial Fraction Expansion01:20

Inverse z-Transform by Partial Fraction Expansion

The inverse z-transform is a crucial technique for converting a function from its z-domain representation back to the time domain. One effective method for finding the inverse z-transform is the Partial Fraction Method, which involves decomposing a function into simpler fractions with distinct coefficients. These fractions correspond to known z-transform pairs, facilitating the inverse transformation process.
To begin the process, the poles of the function are identified and the function is...
Reconstruction of Signal using Interpolation01:10

Reconstruction of Signal using Interpolation

Signal processing techniques are essential for accurately converting continuous signals to digital formats and vice versa. When a continuous signal is sampled with a period T, the resulting sampled signal exhibits replicas of the original spectrum in the frequency domain, spaced at intervals equal to the sampling frequency. To handle this sampled signal, a zero-order hold method can be applied, which creates a piecewise constant signal by retaining each sample's value until the next sampling...

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Related Experiment Video

Updated: Jun 10, 2026

Live Images of GLUT4 Protein Trafficking in Mouse Primary Hypothalamic Neurons Using Deconvolution Microscopy
08:47

Live Images of GLUT4 Protein Trafficking in Mouse Primary Hypothalamic Neurons Using Deconvolution Microscopy

Published on: December 7, 2017

Deconvolution of two-dimensional images with zeros in the transfer function.

R Bernier, H H Arsenault

    Applied Optics
    |August 19, 2010
    PubMed
    Summary

    Information lost at the zeros of a transfer function can be recovered, even with noise. This study extends a 1D method to 2D for image restoration, improving results for degraded real images.

    Area of Science:

    • Image processing and signal analysis
    • Two-dimensional signal restoration
    • Digital image restoration

    Background:

    • Information loss at transfer function zeros is a known challenge in signal processing.
    • Previous one-dimensional methods have limitations in handling complex degradations.
    • Noise and linear filtering, like motion blur, significantly degrade image quality.

    Purpose of the Study:

    • To demonstrate that information at transfer function zeros is recoverable, even in noisy conditions.
    • To extend a one-dimensional information recovery method to two dimensions.
    • To apply the 2D method for restoring images degraded by noise and linear filters.

    Main Methods:

    • Extension of a previously developed one-dimensional treatment to two dimensions.

    Related Experiment Videos

    Last Updated: Jun 10, 2026

    Live Images of GLUT4 Protein Trafficking in Mouse Primary Hypothalamic Neurons Using Deconvolution Microscopy
    08:47

    Live Images of GLUT4 Protein Trafficking in Mouse Primary Hypothalamic Neurons Using Deconvolution Microscopy

    Published on: December 7, 2017

  • Application of an 'honest' filter for perfect restoration in the absence of noise.
  • Utilizing intermediate points where the transfer function is non-zero to recover lost information.
  • Main Results:

    • Successfully recovered information at the zeros of the transfer function, even with noise.
    • The two-dimensional method effectively restored images degraded by linear filtering and noise.
    • Demonstrated significant improvement in the restoration of real-world, linearly degraded images.

    Conclusions:

    • Information lost at transfer function zeros is not irretrievably lost and can be recovered.
    • The developed two-dimensional method offers a robust approach to image restoration.
    • This technique provides a considerable enhancement for restoring degraded real images, particularly those affected by linear blurring and noise.