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Recent advances in video coding technology have resulted in rapid growth of application in mobile communication. With this explosive growth, reliable transmission and error resilient technique become increasingly necessary to offer high quality multimedia service. This paper discusses the error resilient performances of the MPEG-4 simple profile un...
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... basic idea of data partitioning is separation of motion vectors and texture information. In addition to the resynchronization marker, MPEG-4 data partitioning inserts additional markers: the motion marker inserted between motion and texture information as shown in Figure 1. Even if texture information is lost, the lost blocks can be concealed by using the motion information by applying temporal error concealment technique. ...
Context 2
... 9 shows that PSNR of random bit errors decreases at high bit rate due to the more packet losses. On the contrary, in Figure 10, PSNR of burst bit errors increase at higher bit rate because the number of lost slices in the video sequence is quite small, therefore in this case, bitrate increment for the higher video quality brings the increment of decoded image quality. The number of lost packets in bit error = 50% is less than in bit error = 20%, thus, in bit error = 50%, PSNR increases in the 1-slice case. ...
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Citations
... To alleviate this problem, three error resiliency tools are defined in the MPEG-4 visual standard. Resynchronisation markers are used to localise errors within video packets [9][10][11]. Data partitioning provides an additional resynchronisation marker (i.e. ...
This work discusses two approaches to incorporating error resiliency in the Simple Scalable Profile SSP of the ISO/IEC MPEG-4 14496-2 visual standard. As such scalable MPEG-4 is made suitable for deployment in a mobile communication environment. When it was defined in 2000, the syntax of the Simple Scalable Profile (SSP) prohibited the use of the error resiliency tools which were available in the base layer of the MPEG-4 codec. GPRS simulations are employed to illustrate the need for error resiliency in the SSP profile. Two solutions are then proposed based on whether or not bitstream syntax modifications are employed. The first solution is syntax friendly and emulates the use of the Video Packet resiliency tool whilst remaining compliant with standardized decoders. The limitations and constraints of such an approach are then elaborated upon. It is shown that syntax modifications are inevitable. Thus, the second solution proposes the syntax modifications to incorporate the error resiliency tools of the base layer into the enhancement layers of the SSP profile. The new syntax is verified through subjective testing using Multi Media Double Stimulus Continuous Quality Evaluation (MMDSCQE). Subsequently, the new syntax was approved by the ISO/IEC MPEG-4 committee and resulted in a new profile known as the Error Resilient Simple Scalable Profile (ER-SSP). It is shown that minor modifications are required in the Header Extension tool to synchronize the decoding process between the enhancement and the base layer. Thus, it is shown that base layer error resilience tools are equally applicable to the enhancement layer with nominal syntax changes.
... The effects of the built in resilience features and their usage (slice sizes, I frames insertion, etc.) have been already studied, for example in [3,4]. Our intention is to investigate additional possibilities of improvements and their costs. ...
Real-time video conferencing or streaming over mobile network introduces a challenge to the end-to-end design of the whole system. Due to the real-time character of these applications, there are no retransmissions possible at the transport layer and therefore any errors result in packet loss at the re-ceiver. This article investigates error resilience methods, especially improvements of the detection granularity to minimize perceptual visual quality degradation at the receiver. Costs of the additional error resilience is evaluated and a combination of H.264 resilience features, improved error detection and error concealment is finally tested.
... This section discusses several topics related to error resilience of H.264, especially with focus on the standard's rate distortion performance. Other literature 8,9 exists with the focus on channel simulations. ...
The robustness of the recently ratified video compression standard H.264/MPEG-4 AVC against channel errors is evaluated with the focus on rate distortion matters. After a brief introduction of the standard and an explanation of its error-resistant features, it is investigated how the error resilience tools of H.264 can be deployed best for packet-wise transmission as in ATM, H.323, and IP-based services. Further, the performances of two error concealment strategies for use in an H.264-conform decoder are compared to each other.
