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Introduction: State of the Play and Challenges of Visual Quality Assessment

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Visual Signal Quality Assessment

Abstract

Quality of visual signals perceived by human observers has always been a critical issue, so has been the measurement of the signal quality throughout a process chain of acquisition/reproduction, encoding, transmission or storage, decoding, and visualization/display associated with a designated application or service in either analogue or digital form. Digital visual signals compressed using various coding techniques exhibit coding distortions which differ from those known to be associated with analogue visual signals and, therefore, require provision of both subjective and objective distortion or quality measures which quantitatively assess and evaluate the visual picture quality for the purposes of system or service evaluation and optimization. A number of fundamental issues are examined to put the current discussions and activities into perspective and context, including relationship between picture quality assessment and coding designs, how to measure effectiveness of visual signal compression performance, different scales used for visual quality assessment and their intended applications, picture distortion or quality ratings for rate-perceptual-distortion (RpD) optimization.

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Notes

  1. 1.

    Visual signals or pictures refer to images, video, image sequences or motion pictures [118].

  2. 2.

    In [24], 10 MHz sampling rate was used for PCM coding of a 5 MHz analogue TV signal with 8 bits per sample, compared with 8 kHz sampling rate and 8 bits per sample for voice using telephone at the time.

  3. 3.

    Digital storage media commonly used by digital video cameras currently include memory stick, memory card, and flash memory.

  4. 4.

    For example, Australia switched to digital-only TV broadcasting on 10 December 2013 as per Australian Government announcement via “Australia’s Ready for Digital TV.”

  5. 5.

    QoE as defined by International Telecommunication Union Study Group (ITU SG) 12 is application or service specific and influenced by user expectations and context [35], and therefore necessitates assessments of perceived service quality and/or utility (or usefulness) of the service [76].

  6. 6.

    QoS as defined by ITU SG 12 is the totality of characteristics of a telecommunications service that bear on its ability to satisfy stated and implied needs of the user of the service [36], e.g., error rates, bandwidth, throughput, transmission delay, availability, jitter, and so on [91].

  7. 7.

    Perceptually lossless coded visual signals incur no discernable visual difference compared with their originals while they may have undergone irreversible information loss [106, 118].

  8. 8.

    Perceptual entropy defines the theoretical lower bound of perceptually lossless visual signal coding in a similar way that entropy does the lower bound of information lossless coding [81].

  9. 9.

    Prior knowledge plays an important part in subjective rating exercise using ACR which forms a benchmark experience or a point of reference in what constitutes the “best” or “excellent” picture quality as they have seen or experienced, and is also exemplified by the entropy masking effect which is imposed solely by an observer’s unfamiliarity with the masker [110].

  10. 10.

    ŝ consists of three distortion measures, including blur-ringing and false edges, localized jerky motion due to frame repetition, and temporal distortion due to periodic noise, uncorrected block errors due to transmission errors or packet loss and maximum jerky motion of the time history [111].

  11. 11.

    Institute for Telecommunication Sciences, National Telecommunications & Information Administration (NTIA), USA.

  12. 12.

    American National Standards Institute.

  13. 13.

    International Telecommunication Union, Telecommunication Standardization Sector.

  14. 14.

    In [34, 72], these seven indicators/measures or sub-metrics were referred to as parameters. Weighting constants for the seven measures are referred to parameters or coefficients here which are determined or optimized for the outputs of VQM to fit the subjective test data.

  15. 15.

    In [84], it is referred to as “HVS distortion visual noise.”

  16. 16.

    The GSM model in wavelet domain is an RF expressed as a product of two independent RFs and is used to approximate key statistical features of natural pictures [98].

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Acknowledgements

H.R. Wu thanks Dr D.M. Tan of HD2 Technologies for his inputs and valuable discussions during compilation of Chapter 1 and all his past and present colleagues who have contributed to the subject matters covered by Chapter 1.

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Wu, H.R. (2015). Introduction: State of the Play and Challenges of Visual Quality Assessment. In: Deng, C., Ma, L., Lin, W., Ngan, K. (eds) Visual Signal Quality Assessment. Springer, Cham. https://doi.org/10.1007/978-3-319-10368-6_1

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