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Approximate Nearest Neighbor (ANN) search for indexing and retrieval has become very popular with the recent growth of the databases in both size and dimension. In this paper, we propose a novel method for fast approximate distance calculation among the compressed samples. Inspiring from Kohonen's self-organizing maps, we propose a structured hierarchical quantization scheme in order to compress database...
Devices equipped with accelerometer sensors such as today's mobile devices can make use of motion to exchange information. A typical example for shared motion is shaking of two devices which are held together in one hand. Deriving a shared secret (key) from shared motion, e.g. for device pairing, is an obvious application for this. Only the keys need to be exchanged between the peers and neither the...
Several algorithms were proposed to predict the zero-quantized DCT coefficients and reduce the computational complexity of transform and quantization. It is observed that these prediction algorithms achieve good performance for all-zero-quantized DCT blocks. However, the efficiency is much lower for non-all-zero-quantized DCT blocks. This paper proposes an algorithm to improve the prediction efficiency...
In this paper, a new method for synchronous coding of digital audio and video signals is proposed. The audio signal is embedded within video signal to produce synchronous hybrid signal that is further encoded. The receiver is able to extract the audio signal from the hybrid signal, and thus, is able to reconstruct two separate signals, the audio and the video. The proposed method enables synchronous...
A hybrid model was developed to predict the zero-quantized discrete cosine transform (ZQDCT) coefficients for intra blocks in our previous work. However, the complicated overhead computations seriously degrade its performance in complexity reduction. This paper proposes a new prediction algorithm with less overhead operations. First, each N × N pixel block at the input of transform is resized to a...
A novel asymmetric stereoscopic video coding method is presented in this paper. The proposed coding method is based on uneven sample domain quantization for different views and is typically applied together with a reduction of spatial resolution for one of the views. Any transform-based video compression, such as the Advanced Video Coding (H.264/AVC) standard, can be used with the proposed method...
Variable size matrix segmentation and variable size transform are used in the colour image compression methods based on three dimensional matrix widely discrete cosine transform (3DMWDCT). However the coefficients have different statistical properties since different areas of an image and difference size blocks have difference energy centralization. 3D balance quantization based human visual system...
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