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Local backlight dimming is a technology aiming at both saving energy and improving visual quality on television sets. As the rendition of the image is specified locally, the numerical signal corresponding to the displayed image needs to be computed through a model of the display. This simulated signal can then be used as input to objective quality metrics. The focus of this paper is on determining...
Several studies have shown that the relationship between perceived video quality and frame rate is dependent on the video content. In this paper, we have analyzed the content characteristics and compared them against the subjective results derived from preference decisions between different spatial and temporal quality levels. We also propose simple yet powerful metrics for characterizing spatial...
In this paper, we present a novel objective quality metric that takes the impact of frame rate into account. The proposed metric uses PSNR, frame rate and a content dependent parameter that can easily be obtained from spatial and temporal activity indices. The results have been validated on data from a subjective quality study, where the test subjects have been choosing the preferred path from the...
In video streaming applications, it is necessary to choose the rate of the encoded stream to match the available transmission channel capacity. To provide flexible means for rate adaptation, different scalable video coding schemes have been proposed. For example, if necessary the bitrate can be reduced either by downscaling the frame rate (temporal scalability) or the image quality (quality scalability)...
In streaming applications, unequal protection of audio and video tracks may be necessary to maintain the optimal perceived overall quality. For this purpose, the application should be aware of the relative importance of audio and video in an audiovisual sequence. In this paper, we propose a subjective test arrangement for finding the optimal trade-off between subjective audio and video qualities in...
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