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Related Concept Videos

Reducing Line Loss01:18

Reducing Line Loss

429
In a three-phase circuit, line loss is an indicator of energy dissipated as heat due to the resistance of transmission lines. To address this, incorporating transformers into the system—a step-up transformer at the source and a step-down transformer at the load—is a strategic solution. Two three-phase transformers are introduced to improve this.
With a step-up transformer at the source, the voltage is increased, thereby reducing the current in the transmission lines since power loss in...
429
Lossless Lines01:23

Lossless Lines

603
In electrical engineering, a lossless transmission line is characterized by a purely imaginary propagation constant and a resistive characteristic impedance. The ABCD parameters, which describe the relationship between the input and output voltages and currents, indicate an equivalent π circuit with an imaginary series impedance and a shunt admittance. This results in a transmission line that, when the product of the phase constant (beta) and the length of the line is less than pi, exhibits...
603
Boundary Conditions: Lossless Lines01:21

Boundary Conditions: Lossless Lines

449
Consider a single-phase, two-wire, lossless transmission line terminated by an impedance at the receiving end and a source with Thevenin voltage and impedance at the sending end. The line, with length, has a surge impedance and wave velocity determined by the line's inductance and capacitance.
At the receiving end, the boundary condition states that the voltage equals the product of the receiving-end impedance and current. This relationship is expressed as a function of the incident and...
449
Lossy Lines and Overvoltages01:22

Lossy Lines and Overvoltages

379
Transmission-line series resistance and shunt conductance cause three primary effects: attenuation, distortion, and power losses.
Attenuation
When constant series resistance and shunt conductance are present, voltage and current equations are modified. The propagation constant indicates that voltage and current waves consist of both forward and backward traveling components. These waves attenuate as they propagate, with the attenuation factor related to the resistance and conductance. In a...
379
Line Loss01:10

Line Loss

562
The different configurations of source-load connections include wye (star) and delta connections. The relationship between line and phase voltages and currents varies depending on the configuration. When the source is supplying power, it is transmitted through the wires to the load, and during this transmission, some power is absorbed by the wires, leading to line loss.
Line loss impacts power delivery efficiency in a balanced three-phase circuit. The symmetry in such a circuit simplifies the...
562
Aliasing01:18

Aliasing

727
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...
727

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Updated: Mar 8, 2026

Chromatographic Fingerprinting by Template Matching for Data Collected by Comprehensive Two-Dimensional Gas Chromatography
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Hash-Based Line-by-Line Template Matching for Lossless Screen Image Coding.

Xiulian Peng, Jizheng Xu

    IEEE Transactions on Image Processing : a Publication of the IEEE Signal Processing Society
    |January 24, 2017
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces hash-based line-by-line template matching (hLTM) for lossless screen image coding. hLTM significantly reduces computational complexity and improves coding efficiency for images with text and graphics.

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    Area of Science:

    • Image processing
    • Computer vision
    • Data compression

    Background:

    • Template matching (TM) efficiently removes image redundancies but suffers from high computational complexity.
    • Existing methods struggle with the computational demands of large search ranges in TM.
    • Non-local redundancies are prevalent in screen content, particularly in text and graphics.

    Purpose of the Study:

    • To propose a novel hash-based line-by-line template matching (hLTM) algorithm for lossless screen image coding.
    • To address the computational complexity limitations of traditional TM.
    • To enhance coding efficiency for screen content.

    Main Methods:

    • Developed a hash-based search strategy to reduce TM complexity without sacrificing accuracy.
    • Implemented a line-by-line approach for finer granularity and increased prediction accuracy.
    • Evaluated hLTM against traditional TM and High Efficiency Video Coding screen content coding test model SCM-1.0.

    Main Results:

    • hLTM reduced encoding and decoding complexities by 68 and 23 times, respectively, compared to traditional TM (search radius 128).
    • Achieved up to 12.68% bit saving on screen content with rich texts/graphics compared to SCM-1.0.
    • Demonstrated significant improvements in both complexity reduction and coding efficiency.

    Conclusions:

    • Hash-based line-by-line template matching (hLTM) is an effective method for lossless screen image coding.
    • hLTM substantially mitigates the computational burden of TM while improving coding performance.
    • The proposed method offers a practical solution for compressing screen content with high redundancy.