Evaluation of video quality based on objectively estimated metric

Abstract

Multimedia applications, and especially encoded video services, are expected to play a major role in the 3rd generation (3G) and beyond mobile communication systems. Given that future service providers are expected to provide video applications at various price and quality levels, quick and economically affordable methods for preparing/encoding the offering media at various qualities are necessary to be developed. This paper presents a method for objective evaluation of the perceived quality of MPEG-4 video content, based on a quantification of subjective assessments. Showing that subjectively derived perceived quality of service (PQoS) vs. bit rate curves can be successfully approximated by a group of exponential functions, the proposed method exploits a simple objective metric, which is obtained from the mean frame rate vs. bit rate curves of an encoded clip. The validity of this metric is assessed by comparing subjectively derived PQoS results to the corresponding ones, which come from the proposed objective method, showing that the proposed technique provides satisfactory PQoS estimation.Index Terms: MPEG-4, objective measurements, perceived quality of service (PQoS).

Video Quality Prediction based on the Spatial and Temporal Classification of the Uncompressed Content

“…Moreover, as we have shown in earlier works [6][7], each MPQoS vs. bit rate curve can be successfully described by an exponential function of the general form…”

“…However, the issue of developing methods for predicting the video quality at a pre-encoding stage is still a research challenge, where some earlier works of the authors have been published in the field [6][7][8]. This paper will also contribute towards this direction.…”

Perceptual-based Quality Metrics for Image and Video Services: A Survey

“…A method for objectively evaluating perceived quality of service (PQoS) for MPEG-4 coded video content is reported in [44]. The design is based on observations of data from subjective experiments revealing that over a certain threshold bit rates do not impact on perceived quality (PQ) anymore and below a certain threshold PQ drops drastically.…”

Quantitative perceptual comparison of variable bit rate over constant bit rate encoding scheme for MPEG-4 video

“…When the original undistorted/uncompressed video signal is not required for the video quality evaluation process, then the objective method is characterized as Non-Reference (NR) [14][15]. Recently, some works have been published, which exploit some already proposed FR or NR metrics in order to predict the final perceived quality of a specific encoded sequence at a pre-encoding stage [16][17][18]. For the needs of this paper, in order to quantify the perceptual difference between the CBR and VBR encoding efficiency, the use of objective instead of subjective procedures was preferred.…”