A Frame Loss Concealment Solution for Spatial Scalable HEVC using Base Layer Motion Scalable High Efficiency Video Coding (SHVC) is the most recent video coding solution designed mainly for network adaptive or device adaptive applications. It follows a layered coding structure with one base layer (BL) and one or several enhancement layers (ELs) which can be unequally protected. SHVC is often sensitive to packet loss in unreliable networks, especially in case of ELs. In this paper, we propose a novel error concealment method for the SHVC EL under an assumption that the BL is well protected. First, we recover the partitioning and resample motion data from collocated BL frame. Following, we remove outliers of motion field by a motion vector refinement algorithm. Lastly, we conceal loss frame by using motion compensation and deblocking filtering. Experiments conducted with a rich set of test sequences using the spatialscalable SHVC have shown that our proposed method significantly outperforms the existing error concealment methods, e.g., BL Reconstruction Upsampling (RU) and BLSKIP in both subjective and objective quality assessments.

Error Concealment in the Network Abstraction Layer for Medium Grain Scalability of SVC This paper presents an error concealment method for medium grain scalability (MGS) of the scalable extension of H.264AVC. Instead of reconstructing a lost frame using a typically computeintensive error concealment method, in this method, a lightweight decoder preprocessor generates a valid bit stream from the available network abstraction layer (NAL) units in case that MGS layers are used. NAL unit header and slice header are parsed to detect the loss of a NAL unit from MGS layers. Modifications are applied to NAL unit header or slice header if some NAL units of MGS layers are lost. Hence, the number of additional packets that a decoder has to discard as a result of a packet loss is minimized. The proposed method requires low computational cost which is suitable for realtime video streaming. The experimental results demonstrate that the proposed method achieves an improvement of 2.16 dB compared to the NAL unit removal method at 5% packet loss rate. The proposed method can work complementary with other error concealment schemes for a wholeframe loss or serve as a preprocessor to a standard decoder.