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Related Concept Videos

Aliasing01:18

Aliasing

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 signal...
Upsampling01:22

Upsampling

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...
Downsampling01:20

Downsampling

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...
Color Vision01:24

Color Vision

Color perception begins in the retina, the light-sensitive layer at the back of the eye. Two main theories explain how colors are seen: the trichromatic theory and the opponent-process theory. The trichromatic theory, proposed by Thomas Young in 1802 and extended by Hermann von Helmholtz in 1852, suggests that color vision is based on three types of cone receptors in the retina. These cones are sensitive to different but overlapping ranges of wavelengths corresponding to red, blue, and green.
Taping Over Different Ground Profiles01:12

Taping Over Different Ground Profiles

Taping over varying ground profiles requires careful adaptation to achieve accurate measurements. On smooth, level ground with minimal vegetation, the tape can rest directly on the ground. Here, the taping team, typically consisting of a head and a rear tapeman, coordinates their positions with clear communication. The rear tapeman holds the tape at the starting point and guides the head tapeman toward a range pole placed beyond the endpoint, using hand or voice signals to ensure alignment.On...
Design Example01:23

Design Example

The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...

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Enabling High Grayscale Resolution Displays and Accurate Response Time Measurements on Conventional Computers
06:50

Enabling High Grayscale Resolution Displays and Accurate Response Time Measurements on Conventional Computers

Published on: February 29, 2012

Screen-Aware Reverse Tone Mapping.

Mihnea-Petrut-Ilie Mitrache1, Costin-Anton Boiangiu1

  • 1Faculty of Automatic Control and Computer Science, National University of Science and Technology Politehnica of Bucharest (UPB), 060042 Bucharest, Romania.

Journal of Imaging
|June 25, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces a novel neural network for high dynamic range (HDR) imaging. It efficiently converts standard dynamic range (SDR) content to HDR and optimizes it for specific HDR monitors, enhancing visual quality.

Keywords:
HDR imagingdisplay-awareexposure fusionneural networkpeak brightnessreverse tone mapping

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Area of Science:

  • Computer Vision
  • Image Processing
  • Machine Learning

Background:

  • High dynamic range (HDR) imaging enhances visual fidelity by capturing wider luminance ranges.
  • Advancements in HDR monitor technology necessitate efficient content conversion and optimization methods.
  • Standard dynamic range (SDR) to HDR conversion (reverse tone mapping) and HDR content optimization are crucial for display on modern monitors.

Purpose of the Study:

  • To develop a unified solution for reverse tone mapping and HDR content generation tailored for specific HDR monitors.
  • To improve the visual quality of HDR images by addressing issues like hard clipping and optimizing for display characteristics.

Main Methods:

  • A novel neural network architecture conditioned on target peak brightness using a multi-layer perceptron (MLP) module.
  • The network predicts a bracketed stack of low dynamic range (LDR) exposures as the display-aware HDR representation.
  • Jointly performs reverse tone mapping and direct image generation optimized for monitor brightness.

Main Results:

  • Consistent improvements in peak luminance utilization, local contrast, color, and perceptual quality across the consumer HDR range (100-4000 nits).
  • Demonstrated superior performance compared to display-agnostic baseline methods.
  • Effective handling of the ill-posed tone mapping problem through display characteristic guidance.

Conclusions:

  • The proposed method offers an effective solution for display-aware HDR content generation and optimization.
  • The neural network architecture successfully adapts HDR content for various monitor brightness levels.
  • This approach enhances the visual experience of HDR content on modern displays.