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Prediction based algorithms reported in the literature are not able to integrate lossy and near-lossless/lossless coding and uses only causal pixels (non-symmetrical predictor structure) for prediction. A non-symmetrical predictor structure, however, is not able to efficiently adapt near the intensity varying areas, which results into poor prediction. Hence, we propose a novel two-stage algorithm...
Aiming for low-complexity encoding, distributed video coders still fail to achieve the performance of current industrial standards for video coding. One of most important problems in this area is the accurate modeling of the correlation between the predicted signal and the original video. In our previous work we showed that exploiting the quantization distortion can significantly improve the accuracy...
This paper presents an efficient AVS-P2 encoding scheme which is based on motion compensation de-interlacing information. This scheme uses the similarity between motion compensation of encoding and motion compensation of de-interlacing to reduce the overall computational complexity of encoding system. A system analysis is performed to study this similarity. As a result, we use the information of motion...
The ongoing increase of computing performance facilitates a higher algorithmical complexity in video coding systems. The decoder may be able to estimate or derive prediction parameters based on the previously decoded signal. In this paper we present an extension to H.264/AVC where the explicit coding of motion parameters is adaptively replaced by a template matching algorithm that is performed identically...
This paper proposes a remote thin client system for real time multimedia streaming over VNC. A remote frame can be split as two parts, i.e. high motion part and low motion part, and transmitted through the Internet from servers to clients according to the proposed hybrid RTP protocol. A Dynamic Image Detection Scheme (DIDS) is proposed to automatically detecting the high motion part of a frame with...
Distributed video coding allows the compression of video frames in a distributed fashion leading to a rather simple computational encoding, but requiring a complex decoding. The main drawback however is the decoding complexity making some practical applications difficult. Nowadays, most distributed video coding schemes are based on efficient channel codes such as LDPC and Turbo codes. This is the...
Context-based adaptive binary arithmetic coding (CABAC) in H.264/AVC can achieve high compression ratio at the expense of high computational complexity. We have previously proposed a fully hardwired CABAC decoder that supports real-time QFHD (4??1080HD) decoding at maximum bit rate of 80 Mbps. For higher end applications, we analyze the bin distribution of each syntax element (SE) type and the performance...
In the last few years distributed video coding (DVC) has become a new paradigm for video compression where the encoding process needs to be simple. DVC allows for the development of new applications where the computational complexity and the amount of memory inside the video encoder are limited. In this paper, we introduce a new data representation and coding method for DVC systems. The proposed method...
We propose a novel video codec that can distribute computational complexity between the encoder and the decoder in a flexible manner. Since motion estimation is the most computationally intensive part in video coding, it is important to share the motion estimation task. In the proposed algorithm, the decoder estimates motion vectors by performing a partial three step search. The estimated motion vectors...
Video coding standards, such as MPEG-4 Part II and H.264/AVC, follow a block-based hybrid coding design which employs inter picture prediction to exploit temporal dependency and transform coding to exploit spatial dependency. This paper presents a video encoder preprocessing method which is based on transform and quantization to improve coding efficiency performance. The proposed method is applicable...
Multi-view video coding (MVC) is showing a new demand in the video communications, video surveillance systems, video teleconferencing, TV communications, and 3D video games. New algorithms are needed to improve video compression and reduce the complexity of multiple views in order to improve the MVC systems. This paper presents the performance evaluation of the hypercube prediction algorithm (HPA)...
This paper presents a new lossless data compression method which can be used for the next-generation image and video codec. As an alternative system for CABAC (context adaptive binary arithmetic coder), a new binary coding algorithm is introduced. However, this method can be applicable to any kind of symbols. Efficiency of the codec in terms of compression ratio and computational complexity is introduced...
This paper presents a new distributed video coding (DVC) scheme where the DC and the AC coefficients of DCT transform are separately encoded and transmitted. The DC coefficients are first transmitted to the decoder and compared with their corresponding DC coefficients found in the side information derived within the decoder. The result of the comparison is then transmitted back to the encoder and...
When Higher Order Ambisonics (HOA) is used to represent a sound field, the channels might contain a lot of redundancy in some cases. This redundancy can be exploited in order to provide more efficient network transmission and storage. In this work the amount of inter-channel redundancy for Higher Order Ambisonics is investigated. Furthermore, lossless compression techniques that build on this redundancy...
We propose in this paper a novel error resilient transcoding scheme that can be placed at the boundary between wired and wireless networks via heterogeneous network links. This error resilient transcoder shall seamlessly complement the standard scalable video coding (SVC) bitstream to offer additional error resilient adaptation capability for receiving devices. The novel error resilient transcoding...
A novel scheme of scalable video coding (SVC) using super-resolution techniques is proposed in this paper. Utilizing the spatial/temporal scalability of H.264/AVC, we encode half of input high-resolution(HR) frames and their low-resolution (LR) counterparts in a video sequence and employ super-resolution (SR) method to reconstruct skipped frames during decoding. The payload saved from skipped frames...
The Audio and Video Coding Standard of China (AVS) uses multi-resolution analysis of frequency domain (MRAFD) to control pre-echo when coding transient signal. However, this technology complicates the implementation of encoder as well as decoders with more operation and higher computational precision. In this paper, a kind of gain control of time domain is used to encode transient signal instead of...
H.264/AVC is the newest video standard to resolve the efficient transmission of video data. Compared to previous generations, it delivers better quality at lower bit rates. However, its computational complexity increases almost exponentially, which is still a problem and has motivated much research into H.264 real-time codec both in industry and academia. H.264 baseline real-time video decoder implementation...
A robust audio hashing algorithm for AAC audio is proposed in this paper. The robust hash is calculated from MDCT-coefficients which are derived by partial decoding of AAC bitstream. There is no complicated transformation in the proposed algorithm, therefore, it is of low computational complexity. The proposed method is highly robust to MDCT-based audio compression. Experimental results also show...
Transcoding is a fast and elegant solution for the adaptation of video content. In the case of bitrate adaptation, an important technique is requantization transcoding. In this paper, we extend our previous work, that focused on requantization of intra-coded pictures, to P and B pictures. We show that by using a combination of techniques, depending on the slice and macroblock type, improved results...
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