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関連する概念動画

Upsampling01:22

Upsampling

654
Managing signal sampling rates is essential in digital signal processing to maintain signal integrity. A decimated signal, characterized by a reduced frequency range due to its lower sampling rate, can be upsampled by inserting zeros between each sample. This upsampling process expands the original spectrum and introduces repeated spectral replicas at intervals dictated by the new Nyquist frequency. To refine this zero-inserted sequence, it is passed through a lowpass filter with a cutoff...
654
Continuous -time Fourier Transform01:11

Continuous -time Fourier Transform

963
The Fourier series is instrumental in representing periodic functions, offering a powerful method to decompose such functions into a sum of sinusoids. This technique, however, necessitates modification when applied to nonperiodic functions. Consider a pulse-train waveform consisting of a series of rectangular pulses. When these pulses have a finite period, they can be accurately represented by a Fourier series. Yet, as the period approaches infinity, resulting in a single, isolated pulse, the...
963
Aliasing01:18

Aliasing

686
Accurate signal sampling and reconstruction are crucial in various signal-processing applications. A time-domain signal's spectrum can be revealed using its Fourier transform. When this signal is sampled at a specific frequency, it results in multiple scaled replicas of the original spectrum in the frequency domain. The spacing of these replicas is determined by the sampling frequency.
If the sampling frequency is below the Nyquist rate, these replicas overlap, preventing the original...
686
Downsampling01:20

Downsampling

714
When considering a sampled sequence with zero values between sampling instants, one can replace it by taking every N-th value of the sequence. At these integer multiples of N, the original and sampled sequences coincide. This process, known as decimation, involves extracting every N-th sample from a sequence, thereby creating a more efficient sequence.
The Fourier transform of the decimated sequence reveals a combination of scaled and shifted versions of the original spectrum. This...
714
Reconstruction of Signal using Interpolation01:10

Reconstruction of Signal using Interpolation

773
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...
773
Sampling Continuous Time Signal01:11

Sampling Continuous Time Signal

775
In signal processing, a continuous-time signal can be sampled using an impulse-train sampling technique, followed by the zero-order hold method. Impulse-train sampling involves the use of a periodic impulse train, which consists of a series of delta functions spaced at regular intervals determined by the sampling period. When a continuous-time signal is multiplied by this impulse train, it generates impulses with amplitudes corresponding to the signal's values at the sampling points.
In the...
775

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関連する実験動画

Updated: Feb 21, 2026

Automated Analysis of Dynamic Ca2+ Signals in Image Sequences
06:49

Automated Analysis of Dynamic Ca2+ Signals in Image Sequences

Published on: June 16, 2014

17.7K

圧縮スペクトルビデオは,ダイナミックな空間-スペクトル-時間ウィンドウ付きのコーディングによるものです.

David Morales-Norato, Andrés Jerez, Miguel Marquez

    Optics express
    |February 20, 2026
    PubMed
    まとめ
    この要約は機械生成です。

    この研究は,効率的なデータ取得のための新しいシングルショットスペクトルビデオシステムを導入しています. この革新的なアプローチは,1回の曝露でフルスペクトルのビデオを捕捉し,従来のマルチ取得方法の限界を克服します.

    さらに関連する動画

    High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques
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    High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques

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    関連する実験動画

    Last Updated: Feb 21, 2026

    Automated Analysis of Dynamic Ca2+ Signals in Image Sequences
    06:49

    Automated Analysis of Dynamic Ca2+ Signals in Image Sequences

    Published on: June 16, 2014

    17.7K
    High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques
    11:34

    High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques

    Published on: December 3, 2013

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    科学分野:

    • 光学とフォトニック
    • 画像処理 画像処理
    • スペクトロスコーピーは,スペクトロスコーピーを用います.

    背景:

    • スナップショット圧縮画像は,高次元データの効率的な取得を可能にします.
    • 単一のスナップショットでフルスペクトルのビデオをキャプチャすることは,スペクトルと時間の次元を別々に取得することが困難です.

    研究 の 目的:

    • シングルショット圧縮ダイナミックカラーコードスペクトルビデオシステムを開発する.
    • 1回の曝露でスペクトルビデオを撮影する際の制限に対処するためです.

    主な方法:

    • 改善されたピクセル強度とダイナミックレンジのために,ウィンドウ付きタイムコーディングアプローチを採用しています.
    • 液晶調節フィルターと,スペクトルビデオエンコーディングのためのコード化された開口装置を同期します.
    • データの回復のために,プラグ・アンド・プレイの交互方向マルチプライヤー方式 (PnP-ADMM) を利用します.

    主要な成果:

    • 圧縮されたスペクトルビデオの効果的なキャプチャと再構築を実証しています.
    • ウィンドウタイムラルエンコーディングにより,ピクセル強度の均一性とダイナミックレンジの改善を達成します.
    • 広範なシミュレーションと実験的な概念証明を通じてシステムの有効性を検証します.

    結論:

    • 提案されたシステムは,単一のショットで,4次元スペクトルビデオデータを効率的にキャプチャし,再構築します.
    • 新規の圧縮型コーディングスキームとPNP-ADMMアルゴリズムは,スペクトルビデオ取得の課題に対する実用的な解決策を提供します.