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The technology of high-definition video detection has the virtue of high resolution, which can clearly detect vehicle information and license plates, etc. In this paper, according to the characteristics of high-definition video detection technology, we propose a new vehicle location and tracking method, which is based on the brightness curve. Firstly, break up the image by regions, and then we can...
In the fragile digital color image watermarking for RGB color image authentication, fragility or sensitivity of the embedded watermark to malicious attacks is an important problem. In this work the current researches propose Bit Plane Index Modulation (BPIM) based fragile watermarking scheme for authenticating RGB color image. To deal with counterfeiting attacks block wise division dependency is established...
Recently, a new image encryption scheme with compound chaotic sequence cipher shifting dynamically was proposed. In this Letter, the cryptosystem is analyzed and some flaws are pointed out. Then a chosen plaintext attack is described and some remedial modifications are suggested.
Curve reconstruction method of turbulence motion locus is investigated. Through tracing particles be equally-distributed scattered into flow field and each particle's movement has been shot from different orientations in continuous time-points, thus sequential conjugate images have been obtained. On the basis of positioning these particles in each relative coordinate system, relationship of image...
RealVideo is one of the most popular digital video files on Internet. In this paper, the algorithm complexity and data parallelism of decoding process are analyzed and the RealVideo decoder is optimized with the Godson-2's SIMD multimedia expanded instructions and its architecture features. The results show that these optimizations have improved the performance and efficiency of RealVideo decoding...
This paper presents a new automatic approach to building a videorama with shallow depth of field. We stitch the static background of video frames and render the dynamic foreground onto the enlarged background after foreground/background segmentation. To this end, we extract the depth information from a two-view video stream. We show that the depth cues combined with color cues improve segmentation...
Shadow detection and removal is an important step employed after foreground detection, in order to improve the segmentation of objects for tracking. Methods reported in the literature typically have a significant trade-off between the shadow detection rate (classifying true shadow areas as shadows) and the shadow discrimination rate (discrimination between shadows and foreground). We propose a method...
In this paper, we present a new and fast technique for background estimation from cluttered image sequences. Most of the background initialization approaches developed so far collect a number of initial frames and then require a slow estimation step which introduces a delay whenever it is applied. Conversely, the proposed technique redistributes the computational load among all the frames by means...
Nowadays, embedded vision systems have to face new hard requirements involved by modern applications: real-time processing of high resolution images issued by multiple image sensors. Recently, a new adaptable ring-based interconnection network on chip has been proposed. Based on adaptive datapath, it allows handling of multiple parallel pixel streams. In this paper, we present a new hierarchical memory...
In this paper, an efficient video encryption scheme is constructed by image key and is based on hyper-chaos system. The chaotic lattices are used to generate pseudorandom sequences and then selected pixel and bit pixel of image key encrypt frame blocks one by one. By iterating chaotic maps for certain times, the generated pseudorandom sequences obtain high initial-value sensitivity and good randomness...
In this work, a novel implementation of a video transcoder that converts a video sequence encoded with the H.264/AVC standard to a temporally scalable H.264/SVC stream is achieved with the use of a pixel-domain heterogeneous architecture. The input H.264/AVC stream is fully decoded by the transcoder. Macroblock coding modes are extracted from the input stream and are reused to encode the output stream...
Recently, several image cryptographic algorithms based on chaotic maps have been proposed. These algorithms differ in various aspects such as the type of chaotic maps used, methods used for confusion and diffusion, key size, and manipulating images as 2D or 3D. In this paper, a new image encryption algorithm based on chaotic maps is proposed. The algorithm is inspired by two bio-operations: crossover...
H.264/MPEG-4 AVC uses motion prediction with fractional-pixel precision to reduce the temporal redundancy that often exists in a video signal. Previously, it has been shown that Adaptive Interpolation Filter (AIF) methods can significantly improve coding performance compared to the fixed interpolation filters used by existing codecs by adaptively tuning the motion interpolation filters to the video...
This paper introduces an intelligent high-frame-rate video logging system that can automatically detect high-speed unpredictable behavior and record video comprising images with dimensions of 512 × 512 pixels at 1000 fps. To capture high-frame-rate video of crucial moments of abnormal behavior in high-speed periodic motion, a real-time abnormal behavior detection algorithm is implemented on a highspeed...
Reference Picture Selection (RPS) is a powerful error control technique for video streaming. Previously, two fast block-based motion vector concatenation (MVC) algorithms were proposed for video transcoding based on forward dominant vector selection (FDVS) and activity dominant vector selection (ADVS). In this paper, we examine the use of these algorithms in RPS, in the context of video transmission...
This paper explores the possibility of real-time programmable video post processing. As a case study, it implements a novel edge directed video spatial resolution up-conversion algorithm based on the Nvidia CUDA (Compute Unified Device Architect) technology. The algorithm can reliably determine the best direction to perform spatial interpolation. Algorithm and implementation optimizations for execution...
Modern multimedia workloads provide increased levels of quality and compression efficiency at the expense of substantially increased computational complexity. It is important to leverage the off-the-shelf emerging multi-core processor architectures and exploit all levels of parallelism of such workloads in order to achieve real time functionality at a reasonable cost. This paper presents the implementation,...
Demand for 3D visualization is increasing in mobile devices as users have come to expect more realistic immersive experiences. However, limited networking and computing resources on mobile devices remain challenges. A solution is to have a proxy-based framework that offloads the burden of rendering computation from mobile devices to more powerful servers. We present the implementation of a framework...
Video signature techniques based on tomography images address the problem of video identification. This method relies on temporal segmentation and sampling strategies to build and determine the unique elements that form the signature. In this paper an extension for these methods is presented; first an implementation for high contrast sub-sampling and up-sampling filters is used to increase tomography...
In order to increase coding efficiency, a perception-aware H.264/AVC encoder is proposed in this paper. With a different perception models for intra-frames and inter-frames, the initial quantization parameter (QP) is perceptually adjusted to remove perceptual redundancy. Moreover, the associated hardware architectures of the whole encoder and the perception analysis engine are also proposed with hardware...
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