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—Audio-visual and other multimedia services are seen as important sources of traffic for future telecommunication networks , including wireless networks. A major drawback with some wireless networks is that they introduce a significant number of transmission errors into the digital bitstream. For video, such errors can have the effect of degrading the(More)
We use administrative records on the incomes of more than 40 million children and their parents to describe three features of intergenerational mobility in the United States. First, we characterize the joint distribution of parent and child income at the national level. The conditional expectation of child income given parent income is linear in percentile(More)
—Audio-visual and other multimedia services are seen as an important source of traffic for future telecommunications networks, including wireless networks. In this paper, we examine the impact of the properties of a 50 Mb/s asynchronous transfer mode (ATM)-based wireless local-area network (WLAN) on moving picture experts group phase 2 (MPEG 2) compressed(More)
—Many video compression algorithms require decisions to be made to select between different coding modes. In the case of H.264, this includes decisions about whether or not motion compensation is used, and the block size to be used for motion compensation. It has been proposed that constrained optimization techniques , such as the method of Lagrange(More)
Widespread use of digital imagery has resulted in a need to manage large collections of images. Systems providing query by example (QBE) capability offer improved access to contents of image libraries by retrieving matches to a query image. Texture is an important feature to consider in the matching process. However, standard approaches often employ a(More)
Image segmentation can be viewed as the process of classifying regions in a picture into groups with common properties (i.e. texture). A difficulty arising is that common texture can be classified differently when viewed at different scales and rotated viewpoints. This paper presents a feature vector based on the DT-CWT (dual-tree complex wavelet transform(More)