Video Information Systems Research Articles

STUDY OF LOCAL IMAGE FEATURES DETECTORS

The article is devoted to the optimization of local image feature detectors. They can be used in mobile augmented reality video information systems. A study was conducted of the effectiveness of using a brightness preliminary detector in conjunction with a Harris angle detector. The simulation results showed a reduction in the duration of detection of local features of the test image (on average 220 times), a reduction in the number of identified image features and a slight change in the threshold value of the angle response.

Media resources in video information systems

The article describes methods for increasing the contrast of images in video information systems, the main compression of the video stream is provided by eliminating inter-frame redundancy using methods for compensating the movement of image fragments of adjacent frames. However, the use of motion compensation methods requires the formation of additional data (metadata) containing information about the types of image blocks used, their movement coordinates, etc. At the same time, in order to increase the compression of the video stream without sacrificing its quality, a higher accuracy of motion compensation is required, which leads to an increase in the number of blocks and, accordingly, an increase in the volume of the video stream metadata that reduces the effectiveness of motion compensation. This is the main problem of compressing streaming video without compromising image quality. In addition, higher positioning accuracy of blocks with motion compensation dramatically reduces the speed of image processing, which is not always feasible in real-time systems.

Theoretical Foundations Development of Space Adaptive Video Information Systems Synthesis

The main provisions and principles of the synthesis of adaptive video information systems designed for recording and analyzing images of dynamic scenes at the stages of long-range detection of artificial space objects, ballistic and controlled approach to them in the middle and near zone of cooperation are considered. Based on the principle of dominant information, it is shown that the basis for the development of methods and algorithms for processing video information in on-board surveillance systems is the joint adaptive processing of video information in photo-detector matrices and in digital processors in order to maximize the quality of information issued to the consumer by suppressing background and noise information by adaptive hysteresis control of the frame frequency, frame resolution and signal accumulation time in the photodetector matrix, as well as the use of parametric neural network detectors-classifiers.

Investigation of the mechanism for processing predicted frames in the technology of compression of transformed images in computer systems and special purpose networks

The analysis of image processing technologies shows the main practice way to improve the quality of image processing. It is a preliminary analysis and subsequent image processing. It depends on the result of the preliminary analysis (filtration, sharpening, noise reduction, etc.). However, when selection of the method of preliminary analysis, an intermediate evaluation of results, selection of the subsequent processing method, etc. decision makers involved. This is not acceptable for practical implementation in automatic processing and transmission of video information systems. The main difficulties in working with video are large volumes of transmitted information and sensitivity to delays in the video information transmission. Therefore, in order to eliminate the maximum redundancy amount in the formation of the video sequence, 3 types of frames are used: I, P and B which form a frame group. Therefore, the possibility of upgrading coding methods for P-frames is considered on preliminary blocks' type identification with the subsequent formation of block code structures. As the correlation coefficient between adjacent frames increases, the compression ratio of the differential-represented frame's binary mask increases. A mechanism for processing predicted frames in the technology of compression of transformed images in computer systems and special purpose networks has been created. It based on the using of filter masks and the definition of complexity structural indicators of video fragments. It allows us to increase the efficiency of contours detection, namely, the accuracy of the allocation and localization of the semantic component up to 30% with an insignificant increase in the total processing time (no more than 5%).

Video compression method on the basis of discrete wavelet transform for application in video information systems with non-standard parameters

Video compression method on the basis of discrete wavelet transform for application in video information systems with non-standard parameters

Analysis of the Effectiveness of Heterogeneous Video Information Systems on the Basis of the Dominance Criterion

The approaches to the evaluation of the efficiency of the functioning of heterogeneous video information systems are considered. It is shown that the hierarchy model as a quantitative description of the structural and functional organization can serve as a means of analyzing information flows and system efficiency in terms of graph theory. The criterion of dominance for the evaluation of the efficiency of heterogeneous video information systems is analytically presented. It is shown that in the loaded graph of a heterogeneous system the weights of individual nodes represent the efficiency of this node, and with its increase the degree of influence (dominance) of this node on the remaining nodes of the system and on the system as a whole grows, and conversely, with a decrease in the weight of the node it rises its dependence on other nodes. The influence of the length of interstitial paths on the efficiency of the system is taken into account, taking into account the partial loss of information during its propagation through the graph. Numerical calculations of the efficiency of systems based on the dominance criterion are given, the results of which confirm the indicated theoretical positions.

Modern video informatics: problems and prospects

This paper discusses modern problems of video informatics in the area of the formation, transmission, processing, analysis, and visualization of video information. The distinguishing feature of video informatics is that it treats these problems from a unified theoretical viewpoint, and this allows the characteristics of video-information systems to be developed and optimized as a unified whole. It is shown to be effective to use a theoretical–informational approach to analyze and optimize video-information systems, starting from the optical channel of radiation propagation in free space when images or multi-dimensional video data are being formed and concluding with the visualization system. Promising directions of further development of the methods of video informatics are highlighted.

Photodetector sensors and devices for television and optoelectronic video-information systems

This paper discusses photodetector sensors and devices for the UV, visible, and IR region, available from the Elektron Scientific Research Institute for the creation of television and optoelectronic video-information apparatus. The main parameters and features of the application of the available devices are described.

Geo-data acquisition through mobile GIS and digital video: an urban disaster management perspective

For the management of urban disaster risk, periodic updating of building and lifeline geo- databases is crucial, particularly in developing countries where urbanisation rates are very high. However, collecting information on the characteristics of buildings and lifelines through full ground surveys can be very costly and time-consuming. Research into more cost-effective surveying alternatives should be therefore high on the agenda. This paper explores the use of an off-the-shelf low-cost and rapid method of data collection for the development of a building inventory based on the combination of remote sensing (RS), global positioning systems (GPS), digital video (DV) and geographic information systems (GIS). The method developed consists of a sequence of stages, the first stage involves the use of RS and GIS for stratification and mission planning purposes. The second stage consists of using GPS and DV for the creation of spatially referenced images and the third stage involves the use of GIS for display and analysis. The methodology developed was tested on the Costa Rican city of Cartago and its advantages and disadvantages identified.

Semantic video indexing

Providing concept level access to video data requires, video management systems tailored to the domain of the data. Effective indexing and retrieval for high-level access mandates the use of domain knowledge. This paper proposes an approach based on the use of knowledge models to building domain specific video information systems. The key issues in such systems are identified and discussed.

Video Content Representation, Indexing, and Matching in Video Information Systems

Changing between frames is one of the most obvious information in video data. This frame-by-frame time series data is essential to many application areas. However, how to extract and compare video contents in a video information system is still an important problem to be solved. In this paper, we focus on the problem of design a fast searching method in a video information system to locate video segments that match a content-based query, approximately by time series feature values. The idea is to extract video contents via low-level feature extraction and/or high level semantic retrieval mechanisms according to a specific point of view, then segment video contents into bounding boxes via a box segmentation mechanism by their time series feature values. Video content indexing is constructed by the characteristics of prominent points that accompany bounding boxes. We also propose an efficient and effective video content matching algorithm to find similar sequences. With the help of the video indexing and matching mechanisms, several high level box-to-box and low level point-to-point query types can be requested. The implementation and performance evaluation of our video information prototype system is described.