IEEE Transactions on Circuits and Systems for Video Technology

We propose a mixed resolution framework based on full resolution key frames and spatial-reduction-based Wyner-Ziv coding of intermediate nonreference frames. Improved rate-distortion performance is achieved by enabling better side-information generation at the decoder side and better rate-allocation at the encoder side. The framework enables reduced encoding complexity by low resolution encoding o... View full abstract»

Rate control plays an important role in regulating the bit rate to meet the bandwidth and storage requirement. Most existing video encoders regulate the bit rate by adjusting the quantization step size. We propose to incorporate a new dimension: the quantization rounding offset into rate control. In this paper, we present a rate control algorithm with adaptive rounding offsets (ARO) that jointly a... View full abstract»

This paper addresses the problem of how to efficiently manage the power consumption while preserving high visual quality performance in video coding for pervasive video applications. We define an optimization problem that corresponds to the minimization of both the power consumption and video distortion of a video encoder. A joint rate-complexity-distortion(R-C-D) model is developed to capture and... View full abstract»

Since the quality of compressed video is vulnerable to errors, video transmission over unreliable Internet is very challenging today. Multi-hypothesis motion-compensated prediction (MHMCP) has been shown to have error resilience capability for video transmission, where each macroblock is predicted by a linear combination of multiple signals (hypotheses). B picture prediction is a special case of M... View full abstract»

In this paper, the spatial properties of high-definition (HD) videos are investigated based on a large set of HD video sequences. Compared with lower resolution videos, the prediction errors of HD videos have higher correlation. Hence, we propose using 2-D order-16 transforms for HD video coding, which are expected to be more efficient to exploit this spatial property, and specifically propose two... View full abstract»

In this paper, we describe the high-performance implementation of an optical-flow algorithm that takes advantage of the processor's architecture. Tuning the code, i.e., adapting it to take full advantage of the processor, is challenging, time consuming, and requires efficient programming at different levels but can lead to significant improvements in performance. The optimized implementation prese... View full abstract»

This paper presents a true motion-compensated de-interlacing (TMCD) algorithm based on a fast true motion estimation scheme. The fast true motion estimation scheme, designated as a variable block size true motion estimation for a translated motion model (VBTME), finds block-based true motion vectors within interlaced fields and then uses these true motion vectors to construct corresponding de-inte... View full abstract»

Although many data hiding methods are proposed in the literature, all of them distort the quality of the host content during data embedding. In this paper, we propose a novel data hiding method in the compressed video domain that completely preserves the image quality of the host video while embedding information into it. Information is embedded into a compressed video by simultaneously manipulati... View full abstract»

In this paper, an approach to semantic video analysis that is based on the statistical processing and representation of the motion signal is presented. Overall, the examined video is temporally segmented into shots and for every resulting shot appropriate motion features are extracted; using these, hidden Markov models (HMMs) are employed for performing the association of each shot with one of the... View full abstract»

The immense indexing potential of motion cues has hitherto been realized only in domains with more apparent structure (e.g., sport videos). To address the lack of theoretical attention and to realize the potential of motion-based indexing in the subtler film domain, we propose a systematic approach to build taxonomy for film directing semantics. These motion-related semantics are grounded upon cin... View full abstract»

This letter presents an improved decoding algorithm for distributed video coding (DVC) for enhanced performance over error prone wireless channels with multipath fading. The effects of the channel errors on both Wyner-Ziv and key frame bit streams are considered and novel noise models are proposed together with the associated modifications to the decoding algorithm. Simulations are performed using... View full abstract»

We consider the problem of scheduling and resource allocation for multiuser video streaming over downlink orthogonal frequency division multiplexing (OFDM) channels. The video streams are precoded using the scalable video coding (SVC) scheme that offers both quality and temporal scalabilities. The OFDM technology provides the flexibility of resource allocation in terms of time, frequency, and powe... View full abstract»

We investigate the problem of robust video transmission over lossy packet networks. A resilient video coding framework is important to ensure quality video over these networks. We propose a combination of a rate-distortion optimized multiple description codec and an integrated packetization method to constitute the error resilient codec. Multiple description (MD) coding techniques utilize path-div... View full abstract»

Frequency analysis of visual data is a fundamental step in understanding the characteristics of the data and developing necessary tools for processing it. When it comes to analyzing stereoscopic 3-D images, however, conventional methods for 2-D images need to be modified because stereoscopic 3-D images are created by a cognitive process of the human brain. We present the frequency domain analysis ... View full abstract»

With the phenomenal growth of the online and personal video repositories, an efficient and robust example-based video search solution is required to support applications like query by clip, query by capture, and repeated clip detection. In this letter, video sequences are represented as temporal trajectories via scaling and lower dimensional representation of the video frame luminance field, and a... View full abstract»