Evaluation of Impairment Caused by MPEG Video Frame Loss

Abstract

This article presents a study on the impact of video frame losses on the quality perceived by users. Video compression standards, such as MPEG, use a sequence of frames called Group of Pictures (GOP), which is a video compression method which a frame is expressed in terms of one or more neighboring frames. This dependence between frames impacts directly in the quality because a loss of a reference frame prevents the decoding of other frames in GOP, thereby reducing the user-perceived quality. The assessment of quality in this article is estimated by Peak Signal Noise Ratio (PSNR), which compares the original and the received images. Computer simulations were used to show that the degradation on the quality may vary for different patterns of GOPs and type of lost frames.

A Rate Control Model of MPEG-4 Encoder for Video Transmission over Wireless Sensor Network

“…The smallest GOP length is a single I frame. There is no limitation of the GOP length, but a typical length for transmission purpose is about 12 or 15 frames as employed in [24].…”