Subjective video quality evaluation of different content types under different impairments

Pozueco, Laura; Álvarez, Ana; García, X. X.; Garcı́a, Roberto; Melendi, David; Díaz, Gabriel

doi:10.1080/13614568.2016.1152310

Cited by 8 publications

(2 citation statements)

References 25 publications

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“…Both these factors are known to affect video quality [54]. Outside of the educational domains, better perceived video quality has been obtained when degrading the video quality for cartoons (which have a similar content with animation) as compared with sport [45,60] or panorama videos [60]. News type content, which is also similar in limited movement as an interview in our scenario, has found also to obtain better MOS scores than the sport and panorama videos when degraded [60].…”

Section: Discussionmentioning

confidence: 72%

Content type and perceived multimedia quality in mobile learning

Molnar

2016

Multimed Tools Appl

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The increased usage of mobile devices for learning purposes raises several concerns regarding how this adaptation affects learning and perceived quality of educational content across different screen resolutions. This research looks into how educational content type and video adaptation affect the perceived quality of multimedia educational content on two different mobile devices. We consider seven different categories of educational content: slideshow, screencast, presentation, lab demo, interview, documentary, and animation. The results show that the participants could learn regardless of the video content type and the adapted version of the video. We found no statistical significant difference between the perceived quality of the highest quality video and the lower quality video for two of the categories (lab demo and interview) and statistical significant difference on the remaining ones. The implications of this study are also discussed.

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Section: Discussionmentioning

confidence: 72%

Content type and perceived multimedia quality in mobile learning

Molnar

2016

Multimed Tools Appl

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“…There is some literature that suggests a person’s attitude toward a visual stimulus may affect: (a) their perception of its image quality, and (b) their perception of the stimulus itself (Kortum & Sullivan, 2010; Pozueco et al, 2017; Sullivan, Pratt, & Kortum, 2008). For this reason, we asked participants to subjectively rate their experience of each video clip by asking them three questions.…”

Section: Resultsmentioning

confidence: 99%

Narrative video scene description task discriminates between levels of cognitive impairment in Alzheimer’s disease.

et al. 2020

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The process of interpreting and acting upon the visual environment requires both intact cognitive and visual systems. The narrative description (ND) task, initially developed to detect changes in ecologically relevant visual function in people with impaired vision, is an objective measure of the ability to perceive, understand, and describe a visual scene in a movie clip. Objective: Because the ND task draws heavily on semantic and working memory ability in addition to basic visual perception, we aimed to assess the discriminative performance of this task across levels of cognitive impairment. Method: We recruited 56 participants with cognitive status ranging from normal cognition to mild dementia (median age 82, range 66 to 99 years) to watch 20 30-s video clips and describe the visual content without time constraints. These verbal responses were transcribed and processed to generate ND shared word scores using a "wisdom of the crowd," natural-language processing approach. We compared ND scores across diagnostic groups, and used linear mixed models to examine decrements in task performance. Results: There was a stepwise decline of ND scores with increasing levels of cognitive impairment. Additional analyses showed that ND performance was highly related to performance on the Montreal Cognitive Assessment (MoCA) and domain-specific neuropsychological tests for semantic fluency and set shifting. Other models demonstrated differences in ND performance related video content between cognitively normal and impaired participants. Conclusion: The ND test was able to detect decrements in task performance between levels of cognitive impairment and was related to other global neuropsychological measures.

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