IEEE Transactions on Circuits and Systems for Video Technology

The development of the CMOS active pixel sensor (APS) has, for the first time, permitted large scale integration of supporting circuitry and smart camera-functions on the same chip as a high-performance image sensor. This paper reports on the demonstration of a new 128/spl times/128 CMOS APS with programmable multiresolution readout capability. By placing signal processing circuitry on the imaging... View full abstract»

The design and performance of a rail-to-rail low-voltage CMOS fifth-order elliptic low-pass GM-C filter for baseband mobile communication are presented. The operational transconductance amplifier (OTA) used in this filter is a low-voltage rail-to-rail voltage-to-current converter (V-I converter). In this V-I converter, an N-type V-I converter cell is connected in parallel with its counterpart, a P... View full abstract»

A discussion of CMOS readout technologies for infrared (IR) imaging systems is presented. First, the description of various types of IR detector materials and structures is given. The advances of detector fabrication technology and microelectronics process technology have led to the development of large format array of IR imaging detectors. For such large IR FPAs which is the critical component of... View full abstract»

Cellular neural/nonlinear networks (CNN) are considered for efficient implementation of the most computationally intensive steps of dynamic image coding. Several analogic CNN algorithms are presented for the generation of binary image masks and image decomposition. Measurement results for the first CNN universal chips executing an analogic algorithm for a reconstruction operator are also presented... View full abstract»

Human faces provide a useful cue in indexing video content. We present a highly efficient system that can rapidly detect human face regions in MPEG video sequences. The underlying algorithm takes the inverse quantized discrete cosine transform (DCT) coefficients of MPEG video as the input, and outputs the locations of the detected face regions. The algorithm consists of three stages, where chromin... View full abstract»

A robust approach for joint motion and disparity estimation in stereo sequences to synthesize arbitrary intermediate views is presented. The improved concept for stereo image analysis is based on a modified block matching algorithm. In which a cost function consisting of area-based correlation together with an appropriately weighted temporal smoothness term is applied. A confidence measure to eval... View full abstract»

This paper describes a new compression algorithm, termed network-driven motion estimation (NDME), which reduces the power dissipation of wireless video devices in a networked environment by exploiting the predictability of object motion. Since the location of an object in the current frame can often be predicted accurately from its location in previous frames, it is possible to optimally partition... View full abstract»

The code division multiple access (CDMA) scheme has become very popular due to high efficiency for spectrum usage and robust jamming resistance. However, the inherent near-far problem is an impediment. Though deliberate power control algorithms can partially handle this problem, the cost is high. Under the assumption of synchronous symbols and white Gaussian noise, a neural-network-based detector ... View full abstract»

Many studies have been conducted involving the transport of constant and variable bit rate MPEG-2 video in asynchronous transfer mode (ATM) networks; however, many of these studies have considered fairly homogeneous scenarios in which the only other traffic present in the ATM network, if any, are other MPEG-2 video sources. In this study the requirements of supporting MPEG-2 video communications i... View full abstract»

This paper presents a multicasting solution for shared-buffer ATM switch. The cell duplicating function is performed by a one-to-many modified demux circuit. A shared multicast server is used to translate input multicast cells to find destination ports and corresponding routing information. By using a link-list based ring structure, the multicast server can provide a high speed (5 ns to search ent... View full abstract»

Video encoding due to its high processing requirements has been traditionally done using special-purpose hardware. Software solutions have been explored but are considered to be feasible only for nonreal-time applications requiring low encoding rates. However, a software solution using a general-purpose computing system has numerous advantages: it is more available and flexible and allows experime... View full abstract»

Embedded coders provide a better rate-distortion tradeoff while the coded bit stream can be truncated at any point without a significant perceptible distortion. We investigate rate control for an embedded wavelet video coder by converting the rate control problem to a bit allocation problem for each frame. Then, a computationally efficient rate control algorithm is derived by exploiting the rate-d... View full abstract»

We present an algorithm and a hardware architecture for block-based motion estimation that involves transforming video sequences from a multibit to a one-bit/pixel representation and then applying conventional motion estimation search strategies. This results in substantial reductions in arithmetic and hardware complexity and reduced power consumption, while maintaining good compression performanc... View full abstract»

Rapid progresses in computers, telecommunication, and consumer electronics research have stimulated the emergence of powerful multimedia systems that will have profound impacts, on scientific, industrial, business endeavors, and even our daily lives. Continuous advances in deep-submicron microelectronic fabrication technologies have made possible the integration of millions of transistors on a sin... View full abstract»