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Infrared (IR) Spectroscopy: Overview01:09

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When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
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IR Frequency Region: Fingerprint Region01:03

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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...
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Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

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Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
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IR Spectrum01:19

IR Spectrum

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When infrared (IR) radiation passes through a molecule, the bonds stretch or bend by absorbing the radiation. This absorption creates the molecule's absorption spectrum, which is the plot of its percentage transmittance versus wavenumber.
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IR Spectrometers

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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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Hydrocarbons such as alkanes, alkenes, and alkynes show characteristic C–H stretching absorption bands. These IR stretching frequencies depend on the hybridization of the involved carbon atom and can be explained in terms of the s character of each hybridized atomic orbital.
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Interactive Feature Embedding for Infrared and Visible Image Fusion.

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    This study introduces a new self-supervised learning framework with interactive feature embedding for infrared and visible image fusion. The method enhances vital information retention, outperforming existing techniques.

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    Area of Science:

    • Computer Vision
    • Artificial Intelligence
    • Image Processing

    Background:

    • Deep learning for infrared and visible image fusion often uses unsupervised methods with loss functions.
    • Unsupervised approaches may not fully extract all vital information from source images, leading to degradation.
    • Existing methods struggle with guaranteed vital information retention in image fusion.

    Purpose of the Study:

    • To propose a novel interactive feature embedding within a self-supervised learning framework for infrared and visible image fusion.
    • To address the limitation of vital information degradation in current unsupervised fusion methods.
    • To improve the extraction and retention of crucial information from source images.

    Main Methods:

    • Developed a self-supervised learning framework to extract hierarchical representations from source images.
    • Introduced interactive feature embedding to bridge self-supervised learning and image fusion.
    • Utilized a novel approach for vital information retention in the fusion process.

    Main Results:

    • The proposed method effectively extracts hierarchical representations.
    • Interactive feature embedding successfully bridges self-supervised learning and fusion tasks.
    • Qualitative and quantitative evaluations demonstrate superior performance compared to state-of-the-art methods.

    Conclusions:

    • The novel self-supervised framework with interactive feature embedding overcomes vital information degradation in image fusion.
    • The method achieves favorable performance in infrared and visible image fusion.
    • This approach offers an effective solution for retaining vital information during image fusion.