Related Experiment Video
Updated: Nov 7, 2025
11:34
High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques
Published on: December 3, 2013
15.9K
Impact of Scene Content on High Resolution Video Quality
Miroslav Uhrina1, Anna Holesova1, Juraj Bienik1
1Department of Multimedia and Information-Communication Technology, University of Zilina, Univerzitna 1, 010 26 Zilina, Slovakia.
Sensors (Basel, Switzerland)
|April 30, 2021
Summary
Video content significantly impacts perceived quality, with low spatial and temporal information sequences scoring higher. H.265/HEVC is not essential for Full HD, and its Ultra HD efficiency matches Full HD compression.
Area of Science:
- Video compression and quality assessment
- Digital signal processing
Background:
- Assessing video quality is crucial for efficient compression.
- Content characteristics influence subjective video quality perception.
Purpose of the Study:
- To investigate the impact of video content on perceived quality.
- To evaluate compression efficiency of H.264/AVC and H.265/HEVC codecs.
- To determine optimal bitrate thresholds for different resolutions.
Main Methods:
- Subjective evaluation using the Absolute Category Rating (ACR) method.
- Encoding diverse video sequences from the SJTU dataset.
- Testing H.264/AVC and H.265/HEVC at Full HD and Ultra HD resolutions.
Main Results:
- High correlation in results between two independent laboratories.
- Sequences with low Spatial Information (SI) and Temporal Information (TI) achieved higher Mean Opinion Scores (MOS).
- H.265/HEVC offers no advantage for Full HD; its Ultra HD efficiency equals Full HD compression.
Conclusions:
- Spatial and Temporal Information are insufficient for comprehensive scene description.
- Recommendations for minimum bitrate thresholds for good/fair perceived quality are provided.
- H.265/HEVC is not necessary for Full HD compression.
Related Concept Videos
01:22Upsampling
379
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...
379
01:20Downsampling
347
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...
The Fourier transform of the decimated sequence reveals a combination of scaled and shifted versions of the original spectrum. This...
347
02:06Newman Projections
19.3K
Different notations are used to represent the three-dimensional structure of molecules on two-dimensional surfaces. One of the most commonly used representations is the dash-wedge formula. The dashed wedges, solid wedges, and the plane lines indicate the groups situated behind the plane, coming out of the plane, and in the plane, respectively.
The organic molecules rotate across the single bonds leading to numerous temporary three-dimensional structures of varying energy known as...
The organic molecules rotate across the single bonds leading to numerous temporary three-dimensional structures of varying energy known as...
19.3K
01:37Super-resolution Fluorescence Microscopy
11.5K
Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been...
11.5K
01:20Deconvolution
374
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...
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...
374
01:24Relative Motion Analysis - Velocity
521
A stroke engine has a slider-crank mechanism that converts rotational motion from the crank into linear motion of the slider or vice versa. This mechanism consists of three main parts: the crank, the connecting rod, and the slider.
When an external force is exerted, it sets the crank into a rotational movement. This, in turn, instigates the motion of the connecting rod, leading to what is referred to as a general plane motion. This process involves two key points - point A on the connecting rod...
When an external force is exerted, it sets the crank into a rotational movement. This, in turn, instigates the motion of the connecting rod, leading to what is referred to as a general plane motion. This process involves two key points - point A on the connecting rod...
521