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Motion in modern video coders is estimated using a block matching algorithm that calculates the distance and direction of motion on a block-by-block basis. In this paper, a novel fast block-based motion estimation algorithm is proposed. This algorithm uses an efficient projection framework that bounds the distance between a template block and candidate(More)
In a world where surveillance cameras are at every street corner, there is a growing need for synergy among cameras as well as the automation of the data analysis process. This paper deals with the problem of reidentification of objects in a set of multiple cameras inputs without any prior knowledge of the cameras distribution or coverage. The proposed(More)
Compressed video transmitted over unreliable channels such as wireless networks or the Internet may suffer from packet loss. A packet loss leads to image impairment that may cause significant degradation in image quality. In most practical systems, packet loss is detected at the transport layer and a decoder error concealment post-processor tries to(More)
This paper presents an embedded prototype system for pedestrian detection and tracking in outdoor scenes. The system uniquely combines two common techniques for motion detection temporal differencing and background subtraction. The results of these two techniques are adaptively averaged and thresholded to result in a binary motion image. Motion regions are(More)
In this paper, we propose a novel video foreground detection method that exploits the statistics of 3D spacetime patches. 3D space-time patches are characterized by means of the subspace they span. As the complexity of real-time systems prohibits performing this modeling directly on the raw pixel data, we propose a novel framework in which spatiotemporal(More)
The H.264/AVC standard mitigates some of the most noticeable artifacts of former video coding standards, such as blocking and ringing. However, it exhibits a new temporal artifact, not prevalent in these standards: a noticeable discontinuity between an intra frame and its preceding inter frame, known as flicker. This paper proposes a post-processing scheme(More)
Many applications that use three-dimensional scanning require a low cost, accurate and fast solution. This paper presents a fixed-point implementation of a real time active stereo threedimensional acquisition system on a Texas Instruments DM6446 EVM board which meets these requirements. A time-multiplexed structured light reconstruction technique is(More)
Measuring image quality becomes increasingly important due to the many applications involving digital imaging and communication. Image quality assessment aims to develop a visual quality metric that correlates well with human visual perception. In this paper, we present a full-reference image quality assessment technique based on DCT Subbands Similarity(More)
Shadow detection is a well-known problem in image and video processing. Detecting moving shadows is useful in numerous applications such as object detection and tracking. Most works in this area are not suitable for shadow detection using a low-cost outdoor surveillance camera. In this work we suggest a fast shadow detection approach for video surveillance,(More)