Trista Pei-chun Chen

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Video transport over error-prone channels may result in loss or erroneous decoding of the video data. Error concealment is an effective mechanism to reconstruct the video data. In this paper, we review error-concealment methods and introduce a new framework, which we refer to as second-generation error concealment. All the error-concealment methods(More)
Multi-core processors represent a major development in computing technology. For example, Intel® Core™ 2 Quad processors, IBM Cell processors, and Nvidia GeForce 9800 GX2, are widely used. However, most applications struggle to make the best use of the power provided by many-core processors. Easy-to-use software tools are hard to find.(More)
Current approaches to pose estimation and tracking can be classified into two categories: generative and discriminative. While generative approaches can accurately determine human pose from image observations, they are computationally expensive due to search in the high dimensional human pose space. On the other hand, discriminative approaches do not(More)
The recent emergence of multi-core processors enables a new trend in the usage of computers. Computer vision applications, which require heavy computation and lots of bandwidth, usually cannot run in real-time. Recent multicore processors can potentially serve the needs of such workloads. In addition, more advanced algorithms can be developed utilizing the(More)
Progressive transmission of images is very useful in many applications, especially in image transmission over the Internet. To view an image, people would want to see part of the image while the image transmission is in progress, rather than having to wait until the end of the image transmission. On the other hand, the ease of transmission and copying of(More)
Streaming of precoded video, which is both source and channel coded, over wireless networks faces challenges of time-varying packet loss rate and fluctuating bandwidth. Rate shaping has been proposed in [1] to “shape” the precoded video to adapt to the real-time bandwidth requirement and the packet loss rate. In this paper, we propose a novel “fine-grained(More)
DOTS (dynamic object tracking system), our multicamera system designed to aid surveillance workers, has over 20 cameras spread throughout our building, and has been in constant use for over a year. This demo focuses on the system tools that use 3D building geometry. The geometric input to DOTS is a floor plan and information such as cubicle heights. From(More)
We present in this paper an adaptive joint source-channel coding scheme using rate shaping on pre-coded video data. Rate shaping selectively drops portions of the video bitstream before transmitting them in order to satisfy the network bandwidth requirement. In wireless multimedia transport over heterogeneous networks, limited bandwidth is not the only(More)
Streaming of video, which is both sourceand channelcoded, over wireless networks faces challenges of the time-varying packet loss rate and fluctuating bandwidth. Rate shaping (RS) has been proposed to reduce the bit rate of a precoded video bitstream to adapt to the real-time bandwidth variation. In our earlier work, rate shaping was extended to consider(More)