The 4×4 approximate discrete cosine transform (DCT) of H.264/AVC [1] makes it difficult to transcode the pre-coded video contents with the previous video coding standards to H.264/AVC in DCT domain. This is due to the difference between 8×8 DCT used previous standards and 4×4 DCT in H.264/AVC. In this paper, we propose an efficient algorithm that converts the quantized 8×8 DCT block of MPEG-2 i...

H.264/AVC is the newest international video coding standard, intended for a broad variety of applications. Similar to former video standards such as H.261, MPEG-1, MPEG-2, H.263, and MPEG-4, H.264/AVC is based on a block-based hybrid coding framework. The number of bits and distortion for each image block is controlled by that block’s quantization parameter. Rate control is used to select the q...

H.264/AVC was the outstanding and significant video compression standard developed by ITU-T/ISO/IEC Joint Video Team. It achieved excellent encoding performance of at the cost of increased computational complexity and falling encoding speed. In order to overcome poor real-time encoding performance of the important and time consuming motion estimation technology in H.264/AVC standard, aiming at ...

Video coding has been of great research interest to the investigators for past decade and research capacity in video coding has been increased with the increased demand of high quality of video required for different purposes especially with the advent of mobile devices and their applications. H.264 is a next-generation video compression format. It is developed for use in high definition system...

H.264/AVC is the latest video coding standard developed by MPEG and ITU. AVS is the latest video coding standard developed by China. The two new video coding standards will co-exist in the market in the future. So it is necessary to transcode the AVS format to the H.264/AVC format or vice versa. Because the AVS video coding standard is based on the 8x8 block and also uses the intra prediction t...

A scalable video stream can accommodate various forms of network diversity. Scalability can be provided by H.264 SVC (scalable video coding) extension, which is an amendment to the H.264/AVC (advanced video coding) standard. Among various types of scalability, temporal scalability is easily implemented using hierarchical B structure, but the increase in decoding complexity inhibits a flexible s...

In this work we report on the first H.264 authentication watermarker that operates directly in the bitstream with no video decoding or partial decompression. The main contribution of the work is identification of a watermarkable code space in H.264 protocol. The algorithm creates "exceptions" in H.264 code space that only the decoder understands while keeping the bitstream syntax compliant The ...

INTRODUCTION ................................................................ 262 TECHNICAL ASPECTS OF RNA BIOCHEMISTRYC. .. 263 Size ...263 Compositio.... . 263 Methylation . .263 RNA-DNA Hybridization ...264 Cell Fractionation ......................................................... 264 PATTERNS OF SYNTHESIS OF ANIMAL CELL R.. ........ .. 264 "Rapidly Labeled RNA" and Kinetic Analysis Experi...

We investigate the rate-compatible punctured convolutional (RCPC) codes concatenated with hierarchical QAM for designing a cross-layer unequal error protection scheme for H.264 coded sequences. We first divide the H.264 encoded video slices into three priority classes based on their relative importance. We investigate the system constraints and propose an optimization formulation to compute the...

Quarter-pel (q-pel) motion compensation (MC) is one of the features of H.264/AVC that aids in attaining a much better compression factor than what was possible in preceding standards. The better performance however also brings higher requirements for computational complexity and memory access. This article describes a novel data storage and the associated addressing scheme, together with the sy...