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The following topics are dealt with: advances in video and image coding; multimedia content annotation, retrieval, and management; digital rights management; multimedia systems and its applications; optimization-oriented algorithms for audio and music processing; adaptive video streaming; visualization; remote sensors; towards the next-generation peer-to-peer services; data indexing; navigating and...
We propose a novel adaptive image interpolation method based on the weight classified vector quantization (CVQ) using optimal coefficients which are constrained by a quadratic signal class. It overcomes the computational complexity bottleneck of other second-order image interpolation methods such as an edge-directed and an optimal recovery interpolation. Our proposed interpolation method consists...
This paper proposes an improved DCT-based image codec embedded cubic spline interpolation (CSI) with optimal quantization. It is shown in literature that CSI is superior in performance to the other interpolation functions. One of main applications of the CSI is to cooperate with standard DCT-based JPEG to obtain the modified JPEG codec and still obtain a better quality of the reconstructed image for...
The paper demonstrates a method of simultaneously testing the spatial and tonal resolution of a camera. Unlike the modulation transfer function which has been used in the past, the measure proposed rates the resolution as a single number rather than a response over varied resolution, simplifying the measure and making it possible to compare the performance of different cameras easily. Previous work...
In this paper, we develop a constant-quality rate control algorithm for a surveillance system that consists of one "base encoder" for encoding a down-sampled full-view version of the input video sequence and one "region of interest (ROI) encoder" for encoding the region of interest of the input video at the original resolution. Exploiting the inter-relationship between these two...
The H.264/AVC video coding standard uses 7 variable block sizes ranging from 16times16 to 4times4 in interframe coding. The motion estimation with 7 modes needs very high computational complexity. To reduce the complexity of ME module in H.264, we propose a new and fast motion-estimation algorithm based on partial block distortion for sorted significant features including bit-plane and absolute difference...
Color space conversion is an important kernel in multimedia codecs such as JPEG and MPEG. When implemented using SIMD instructions, however, the performance improvement is often limited due to two reasons. First, corresponding color space components are stored at non-unit strides and, second, intermediate results can be larger than 8 bits. In this paper we show that extended subwords and the matrix...
A novel indexing and access method, called affinity hybrid tree (AH-tree), is proposed to organize large image data sets efficiently and to support popular image access mechanisms like content-based image retrieval (CBIR) by embedding the high-level semantic image-relationship in the access mechanism as it is. AH-tree combines space-based and distance-based indexing techniques to form a hybrid structure...
Image annotation plays an important role in bridging the semantic gap between low level features and high level semantic contents in image access. In this paper, such a task is tackled by annotating regions which are primitives of a visual scene. We propose a probabilistic model to characterize spatial context for region annotation. Such a model provides a unifying framework integrating both feature...
Automatic image content annotation techniques attempt to explore structural visual features of images that describe image content and associate them with image semantics. In this paper, two types of concept spaces, atomic concept and collective concept spaces, are defined and the annotation problems in those spaces are formulated as feature classification and Bayesian inference, respectively. A scheme...
In this paper, an interactive object annotation approach for video database will be proposed. The same semantic objects such as characters, backgrounds, and the main subjects in keyframes of each video shots can be queried and annotated based on the similarity of low-level features such as the color, area, and position of each region. An adaptive image enhancement algorithm is used for handling the...
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