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Effects of static and dynamic image noise and background luminance on letter contrast threshold

Asli Kumcu (UGent) , Ljiljana Platisa (UGent) and Wilfried Philips (UGent)
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PANORAMA
Abstract
We performed a pilot psychovisual experiment to determine the contrast threshold and slope of the psychometric function for a target embedded in two levels of static and dynamic external image noise. Sloan letters were presented in a local background surrounded by a global background, both varied over four luminance levels: 58.62, 155.97, 253.50, and 347.47 candela per square meter. Uncorrelated Gaussian noise with normalized standard deviation 0.019 and 0.087 was added to the stimuli. A noise-free stimulus was also tested. No systematic effect of global background luminance was found. The contrast threshold was approximately 1% in the noise-free stimulus and increased monotonically with rms noise contrast, following a power law relationship. Thresholds were higher in static noise. The model will be incorporated in a no-reference, task-based medical quality metric for x-ray sequences.
Keywords
visual noise, dynamic noise, contrast threshold

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Citation

Please use this url to cite or link to this publication:

Chicago
Kumcu, Asli, Ljiljana Platisa, and Wilfried Philips. 2015. “Effects of Static and Dynamic Image Noise and Background Luminance on Letter Contrast Threshold.” In International Workshop on Quality of Multimedia Experience, 1–2. IEEE.
APA
Kumcu, A., Platisa, L., & Philips, W. (2015). Effects of static and dynamic image noise and background luminance on letter contrast threshold. International Workshop on Quality of Multimedia Experience (pp. 1–2). Presented at the 7th International Workshop on Quality of Multimedia Experience (QoMEX 2015), IEEE.
Vancouver
1.
Kumcu A, Platisa L, Philips W. Effects of static and dynamic image noise and background luminance on letter contrast threshold. International Workshop on Quality of Multimedia Experience. IEEE; 2015. p. 1–2.
MLA
Kumcu, Asli, Ljiljana Platisa, and Wilfried Philips. “Effects of Static and Dynamic Image Noise and Background Luminance on Letter Contrast Threshold.” International Workshop on Quality of Multimedia Experience. IEEE, 2015. 1–2. Print.
@inproceedings{6834404,
  abstract     = {We performed a pilot psychovisual experiment to determine the contrast threshold and slope of the psychometric function for a target embedded in two levels of static and dynamic external image noise. Sloan letters were presented in a local background surrounded by a global background, both varied over four luminance levels: 58.62, 155.97, 253.50, and 347.47 candela per square meter. Uncorrelated Gaussian noise with normalized standard deviation 0.019 and 0.087 was added to the stimuli. A noise-free stimulus was also tested. No systematic effect of global background luminance was found. The contrast threshold was approximately 1\% in the noise-free stimulus and increased monotonically with rms noise contrast, following a power law relationship. Thresholds were higher in static noise. The model will be incorporated in a no-reference, task-based medical quality metric for x-ray sequences.},
  author       = {Kumcu, Asli and Platisa, Ljiljana and Philips, Wilfried},
  booktitle    = {International Workshop on Quality of Multimedia Experience},
  isbn         = {9781479989584},
  issn         = {2372-7179},
  keyword      = {visual noise,dynamic noise,contrast threshold},
  language     = {eng},
  location     = {Costa Navarino, Greece},
  pages        = {1--2},
  publisher    = {IEEE},
  title        = {Effects of static and dynamic image noise and background luminance on letter contrast threshold},
  url          = {http://dx.doi.org/10.1109/QoMEX.2015.7148152},
  year         = {2015},
}

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