Trista Pei-chun Chen

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Current approaches to pose estimation and tracking can be classified into two categories: generative and discrimi-native. While generative approaches can accurately determine human pose from image observations, they are compu-tationally expensive due to search in the high dimensional human pose space. On the other hand, discriminative approaches do not(More)
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)
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 multi-core processors can potentially serve the needs of such workloads. In addition, more advanced algorithms can be developed utilizing the(More)
Our analysis and visualization tools use 3D building geometry to support surveillance tasks. These tools are part of DOTS, our multicamera surveillance system; a system with over 20 cameras spread throughout the public spaces of our building. The geometric input to DOTS is a floor plan and information such as cubicle wall heights. From this input we(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 "(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. Furthermore, it's not(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)
of video, which is both source-and channel-coded, 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 not only(More)
This paper is organized as follows. In Section 2, we formulate the proposed UMPC method for modeling non-stationary and multi-modal data. Both MPC and UPC are shown to be special cases of the proposed UMPC model. We apply UMPC to error concealment in Section 3. The experiment results in Section 4 show the performance of UMPC for error concealment over(More)