In this paper we present an analysis of the storage complexity of Huffman codes, Tunstall codes and arithmetic codes in various implementations and relate this to the achieved redundancies. It turns out that there exist efficient implementations of both Huffman and Tunstall codes and that their approximations result in arithmetic codes. Although not optimal, the arithmetic codes still have a be...

In this paper, we propose a very low bit rate video coding scheme based on a discrete wavelet transform (DWT), block-matching motion estimation (BME) and overlapped block motion compensation (OBMC). Our approach reveals that the coding process works more eeciently if the quan-tized wavelet coeecients will be pre-processed by a mechanism exploiting the redundancies in the wavelet subband structu...

Inter-frame coding using interand intra-predictions plays an important role in achieving high compression efficiency in H.264/AVC. However, most intra-predictions are unnecessary, since the intra-coding mode occupies less than 5% of the overall coding in interframe coding. In this paper, we propose an intra mode skip algorithm for inter-frame coding in H.264/AVC as a means of obtaining fast int...

We present a novel error-concealment method for MPEG-2 video decoders. Imperfect transmission of block-based compressed images may result in loss of blocks, making image degradation inevitable. In the hybrid error-concealment method, both spatial and temporal error concealment repair the damaged regions through adaptive interpolation in the respective domains. In order for the hybrid method to ...

7 ABSTRACT: Emerging High efficiency video coding (HEVC) is expected to be widely adopted in network applications for high definition devices and mobile terminals. Thus, construction of HEVC’s encryption schemes that maintain format compliance and bit rate of encrypted bit stream becomes an active security’s researches area. This paper presents a novel selective encryption technique for HEVC vi...