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Visual Quality Assessment

       T.L.R. Mengko
Bad vs Good Potato
Visual Quality Measurement
• Measurement of visual quality is of fundamental
  importance to numerous image and video processing
  applications.
• The goal of quality assessment (QA) to automatically
  assess the quality of images or videos in a perceptually
  consistent manner.
• Image QA algorithms generally interpret image quality as
  fidelity or similarity with a ‘reference’ or ‘perfect’ image in
  some perceptual space.
• Such ‘Full-Reference’ QA methods attempt to achieve
  consistency in quality prediction by modeling salient
  physiological and psycho-visual features of the human
  visual system (HVS), or by signal fidelity measures.
Describing Existing Visual Resources
Some Parameters
•   mean-squared-error 'MSE'
•   peak signal-to-noise-ratio 'PSNR'
•   structural similarity index 'SSIM'
•   multi-scale SSIM index 'MSSIM'
•   visual signal-to-noise ratio 'VSNR'
•   visual information fidelity 'VIF'
•   pixel-based VIF 'VIFP'
•   universal quality index 'UQI'
•   information fidelity criterion 'IFC'
•   noise quality measure 'NQM'
•   weighted signal-to-noise ratio 'WSNR'
•   signal-to-noise ratio 'SNR'

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05 visual quality assessment

  • 2.
  • 3. Bad vs Good Potato
  • 4. Visual Quality Measurement • Measurement of visual quality is of fundamental importance to numerous image and video processing applications. • The goal of quality assessment (QA) to automatically assess the quality of images or videos in a perceptually consistent manner. • Image QA algorithms generally interpret image quality as fidelity or similarity with a ‘reference’ or ‘perfect’ image in some perceptual space. • Such ‘Full-Reference’ QA methods attempt to achieve consistency in quality prediction by modeling salient physiological and psycho-visual features of the human visual system (HVS), or by signal fidelity measures.
  • 6.
  • 7.
  • 8. Some Parameters • mean-squared-error 'MSE' • peak signal-to-noise-ratio 'PSNR' • structural similarity index 'SSIM' • multi-scale SSIM index 'MSSIM' • visual signal-to-noise ratio 'VSNR' • visual information fidelity 'VIF' • pixel-based VIF 'VIFP' • universal quality index 'UQI' • information fidelity criterion 'IFC' • noise quality measure 'NQM' • weighted signal-to-noise ratio 'WSNR' • signal-to-noise ratio 'SNR'