Dr. Cristian Coman Profile

Dr. Cristian Coman

at NATO C&I Agency

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Proceedings Article | 3 February 2014 Paper

Video interpretability rating scale under network impairments

Thomas Kreitmair, Cristian Coman

Proceedings Volume 9016, 90160L (2014) https://doi.org/10.1117/12.2040862

KEYWORDS: Video, Image processing, Video surveillance, Video processing, Signal to noise ratio, Sensors, Image quality, Image compression, Signal attenuation, Modulation transfer functions

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This paper presents the results of a study of the impact of network transmission channel parameters on the quality of streaming video data. A common practice for estimating the interpretability of video information is to use the Motion Imagery Quality Equation (MIQE). MIQE combines a few technical features of video images (such as: ground sampling distance, relative edge response, modulation transfer function, gain and signal-to-noise ratio) to estimate the interpretability level. One observation of this study is that the MIQE does not fully account for video-specific parameters such as spatial and temporal encoding, which are relevant to appreciating degradations caused by the streaming process. In streaming applications the main artifacts impacting the interpretability level are related to distortions in the image caused by lossy decompression of video data (due to loss of information and in some cases lossy re-encoding by the streaming server). One parameter in MIQE that is influenced by network transmission errors is the Relative Edge Response (RER). The automated calculation of RER includes the selection of the best edge in the frame, which in case of network errors may be incorrectly associated with a blocked region (e.g. low resolution areas caused by loss of information). A solution is discussed in this document to address this inconsistency by removing corrupted regions from the image analysis process. Furthermore, a recommendation is made on how to account for network impairments in the MIQE, such that a more realistic interpretability level is estimated in case of streaming applications.

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