Serwis Infona wykorzystuje pliki cookies (ciasteczka). Są to wartości tekstowe, zapamiętywane przez przeglądarkę na urządzeniu użytkownika. Nasz serwis ma dostęp do tych wartości oraz wykorzystuje je do zapamiętania danych dotyczących użytkownika, takich jak np. ustawienia (typu widok ekranu, wybór języka interfejsu), zapamiętanie zalogowania. Korzystanie z serwisu Infona oznacza zgodę na zapis informacji i ich wykorzystanie dla celów korzytania z serwisu. Więcej informacji można znaleźć w Polityce prywatności oraz Regulaminie serwisu. Zamknięcie tego okienka potwierdza zapoznanie się z informacją o plikach cookies, akceptację polityki prywatności i regulaminu oraz sposobu wykorzystywania plików cookies w serwisie. Możesz zmienić ustawienia obsługi cookies w swojej przeglądarce.
At present, a hyperspectral image has a significant advantage in the aspect of application because of its high spectral resolution. However, owing to the limit of communication capacity, a hyperspectral image must be compressed. In this paper, we develop and propose a fractal lossy hyperspectral image compression method based on prediction. First, we exploit spatial correlation by applying predictive...
Video compression has become more and more important nowadays along with the increasing application of video sequences and rapidly growing resolution of them. H.264 is a widely applied video coding standard for academic and commercial purposes. And fractal theory is one of the most active branches in modern mathematics, which has shown a great potential in compression. In this paper, this study proposes...
A novel approach of Doppler spectrum reconstruction based on iterative adaptive algorithm (IAA) for Multi-Input Multi-Output Synthetic Aperture Radar (MIMO SAR) is proposed. Firstly, the mathematical representation of the ambiguous Doppler spectrum is established, and the relationships of the Doppler signals among different transmit-receive pairs are derived. Based on the derivation aforementioned,...
In this paper, we propose a fast intra-prediction mode decision algorithm based on the probability statistics of the best prediction mode and the relevance of the neighboring blocks for high efficiency video coding (HEVC) to reduce its encoding complexity. The intra prediction candidates are reduced before Rate Distortion Optimization (RDO) procedure by two steps of rough mode decision. Sum of Absolute...
A circular survey using GPR is employed for tree roots detection in field measurement. A new 3D imaging algorithm is also proposed for implementing the 3D reconstruction of the subsurface targets in cylindrical coordinate system. The proposed algorithm can avoid the spatial interpolation of the acquired data between coordinate systems and employs the wave equation extrapolation technique to implement...
The original data of one view video is huge and that of multi-view video is much more. So, data compression is important for multi-views, and data compression is a key technology for multi-views. In this paper, we explore an efficient fractal video codec with multi-views. From the experimental results with the proposed method and other state of the art methods, we can conclude that the proposed algorithm...
A circular survey for 3D GPR using the linearly polarized antenna is proposed to detect and map the hidden cylinders. The backscattering signal from cylinders may strongly depend on the orientation of the cylinder relative to the antenna. The circular survey can conform to the optimal measuring condition that the long axis of the bow-tie antenna oriented is parallel to the long axis of the cylinders,...
The bow-tie antenna, which is widely used in impulse ground penetrating radar (GPR), has very low radiating efficiency. It is because that, nearly 70% of the radiated energy exists as the form of end reflection, which is harmful to probe objects. In order to keep the probing ability, the remarkable energy in end reflections is usually dissipated by resistive loading. We find that, in this paper, if...
Circular cylinders are important classes of environmental and engineering targets which act as depolarizing features, such as pipes, cables, rebar and tree roots. Two-dimensional plan survey using the linearly polarized Ground Penetrating Radar (GPR) is verified as an effective method to obtain the full-resolution image of subsurface objects and architecture. Compared to the regular measurement, a...
A new procedure for detection of tree roots and root biomass estimation by using a promising Ground Penetrating Radar (GPR) system with high accuracy positioning system was proposed. This system acquires the accurate antenna position and fuses it with the GPR data, and then a three dimensional (3D) data cube can be obtained. After analysing the acquired 3D cube in field measurement, some specific...
License plate automatic recognition is realized by Matlab in the paper, which is applied in toll payment, guard monitor, et al, and has promising future in the control and management of the traffic. The system can be divided into three modules that are license plate orientation, license plate character segmentation and recognition. In the process, it involves image processing, color dimensional conversion,...
3D affine measurement, 3D geometrical modeling and further 3D rendering of the scene are achieved through the uncalibrated single view perspective-projecting image of the scene under the minimum geometrical constraints. The minimum geometrical constraints contain the 3D vanishing points and also the corresponding 3D measured distances along XYZ directions. The camera internal calibration parameters...
Fractal image coding method is a novel compression method, in which the local self-similarity of the image is used to eliminate cross-scale redundancy existing in image data. It receives wide academic attention with its innovative idea, high compression ratio, high decoding speed, independent resolution etc. however, for the encoding time and quality of decoding needs to be improved, there have been...
Virtual view synthesis is the key technology of virtual reality and multi-view video system. Thus a new algorithm based on disparity estimation and interpolation is proposed in order to achieve intermediate view of any position between original images. A method of precise matching of every pixel based on block matching in the whole image is proposed in disparity estimation. And prediction work of...
This paper mainly introduces three typical transform domain methods for image coding. Design programs of image transform domain coding algorithms based on DFT, DCT and WHT. For different input images, the paper compares their performances of compression and decompression through different algorithms. By introducing principles and detailed derivations of different transformations, it shows how to realize...
Fractal coding is a recent and effective compression technique based on self-similarity of images. However, its encoding time is very high. In addition, when 2-D fractal coding is applied directly to field-sequential stereo video sequences, the high vertical-frequencies of stereo image pairs are suppressed. This makes the depth perception defective. In this paper, a survey of fractal coding development,...
Intermediate View Synthesis (IVS) is a key technology in multi-view display, and it is widely used in many fields, such as three dimensional (3D) television, 3D tele-videoconference, 3D video application, robot vision, virtual machine, medical surgery and so on. Disparity estimation is one of main methods of IVS. Some new intermediate view reconstruction techniques based on the adaptive disparity...
Virtual view rendering is one of the key techniques of interactive 3D video systems, and is analogue expression to the real world in virtual reality systems. This paper proposes a new algorithm of virtual view rendering between two views taken in the same scene at the same time, which is based on self-adaptive block matching disparity estimation. This algorithm outputs any view between the two origin...
With a rapid demand for multimedia information, visual information plays an important part in information achieving. But the data size of a video is so enormous that it should be compressed and coded immediately. In order to improve the efficiency of MPEG-4 and MPEG-7 adopt content-based coding method, a video sequence is segmented into several meaningful video objects before coding. Video object...
Face detection has been a key issue for computer vision. It is essential to many applications, for example, human face synthesis, face tracking, pose estimation, facial expression recognition and object oriented image coding. Detection and localization of human faces is still a challenge because of several difficulties, such as variable face orientations, different face sizes, partial occlusions of...
Podaj zakres dat dla filtrowania wyświetlonych wyników. Możesz podać datę początkową, końcową lub obie daty. Daty możesz wpisać ręcznie lub wybrać za pomocą kalendarza.