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    Wyświetlanie 1-12 z 12
    Tytuł:
    The potential of photogrammetric method of measurement dynamic displacements of flexible bridges
    Autorzy:
    Wyczałek, I.
    Wyczałek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/383528.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    dynamic displacement
    photogrammetric survey
    image matching
    Opis:
    Steel-ground structures are more susceptible than other bridges to the forces associated with their operation. Among the most difficult forces to measure and interpret are those which cause the occurrence of rapid movements. Electronic sensors are normally used for the evaluation of such movements, such as accelerators, distance meters, LVGT etc. Classical surveying methods make it possible to carry out precise displacement surveys using a "tracking" mode, several times per second, and these can therefore be used to study movements at a frequency of 1 Hz for a range of displacements of at least 1 mm. A higher frequency of registration, while simultaneously increasing the number of measured points, is possible using a photogrammetric method. In the classical sense, photogrammetry is a technique for determining specific geometric features based on measurements of points on images of an object and their mathematical processing. Currently, images are made using widely available high-resolution digital cameras, allowing images to be captured at the desired distance, with good image stabilization and short exposure time. In this paper, we present investigations using a method of measuring these rapid movements with one or more cameras and a variable number of lighting targets. This method includes the installation of lighting for the object, stabilization of the cameras, image capturing and automatic processing. Each measurement is performed using image-matching algorithms and refers to several (at least two) fixed points in the object space. This method was tested on following real objects: (1) a railway bridge during the passage of a number of trains at different speeds; and (2) a rotating footbridge. Objects were photographed using a PointGrey Black Fly camera from a distance of less than 50 m and with a frequency of 50 Hz. The results are presented in the form of two-dimensional displacement vectors of four points with a precision of ±0.5 mm. The course of the measurement and the evaluation of the results indicate the high potential of the method in studying the dynamics of flexible structures. In conclusion, it was stated that the described solution is a concept and is to serve as an inspiration for particular applications. It is now the subject of further development.
    Źródło:
    Archiwum Instytutu Inżynierii Lądowej; 2017, 23; 333-345
    1897-4007
    Pojawia się w:
    Archiwum Instytutu Inżynierii Lądowej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of cascading two-dimensional canonical correlation analysis to image matching
    Autorzy:
    Forczmański, P.
    Kukharev, G.
    Kamenskaya, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/206165.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    canonical correlation analysis
    image matching
    face recognition
    Opis:
    The paper presents a novel approach to Canonical Correlation Analysis (CCA) applied to visible and thermal infrared spectrum facial images. In the typical CCA framework biometrical information is transformed from original feature space into the space of canonical variates, and further processing takes place in this space. Extracted features are maximally correlated in canonical variates space, making it possible to expose, investigate and model latent relationships between measured variables. In the paper the CCA is implemented along two directions (along rows and columns of pixel matrix of dimension M x N) using a cascade scheme. The first stage of transformation proceeds along rows of data matrices. Its results are reorganized by transposition. These reorganized matrices are inputs to the second processing stage, namely basic CCA procedure performed along the rows of reorganized matrices, resulting in fact in proceeding along the columns of input data matrix. The so called cascading 2DCCA method also solves the Small Sample Size problem, because instead of the images of size MxN pixels in fact we are using N images of size M x 1 pixels and M images of size 1 x N pixels. In the paper several numerical experiments performed on FERET and Equinox databases are presented.
    Źródło:
    Control and Cybernetics; 2011, 40, 3; 833-848
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A binary representation for real-valued, local feature descriptors
    Autorzy:
    Oszust, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/384335.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    SIFT
    SURF
    LDAHash
    binary tests
    image matching
    image recognition
    Opis:
    The usage of real-valued, local descriptors in computer vision applications is ofen constrained by their large memory requirements and long matching time. Typical approaches to the reduction of their vectors map the descriptor space to the Hamming space in which the obtained binary strings can be efficiently stored and compared. In contrary to such techniques, the approach proposed in this paper does not require a data-driven binarisation process, but can be seen as an extension of the floating-point descriptor computation pipeline with a step that allows turning it into a binary descriptor. In this step, binary tests are performed on values determined for pixel blocks from the described image patch. In the paper, the proposed approach is described and applied to two popular real-valued descriptors, SIFT and SURF. The paper also contains a comparison of the approach with state-of-the-art binarisation techniques and popular binary descriptors. The results demonstrate that the proposed representation for real-valued descriptors outperforms other methods on four demanding benchmark image datasets.
    Źródło:
    Journal of Automation Mobile Robotics and Intelligent Systems; 2017, 11, 1; 3-9
    1897-8649
    2080-2145
    Pojawia się w:
    Journal of Automation Mobile Robotics and Intelligent Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Inversion of side scan sonar motion and posture in seabed geomorphology
    Autorzy:
    Tao, W.
    Liu, Y.
    Hu, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/258774.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    side scan sonar
    image matching
    image fusion
    neutral network
    motion inversion
    Opis:
    Side scan sonar measurement platform, affected by underwater environment and its own motion precision, inevitably has posture and motion disturbance, which greatly affects accuracy of geomorphic image formation. It is difficult to sensitively and accurately capture these underwater disturbances by relying on auxiliary navigation devices. In this paper, we propose a method to invert motion and posture information of the measurement platform by using the matching relation between the strip images. The inversion algorithm is the key link in the image mosaic frame of side scan sonar, and the acquired motion posture information can effectively improve seabed topography and plotting accuracy and stability. In this paper, we first analyze influence of platform motion and posture on side scan sonar mapping, and establish the correlation model between motion, posture information and strip image matching information. Then, based on the model, a reverse neural network is established. Based on input, output of neural network, design of and test data set, a motion posture inversion mechanism based on strip image matching information is established. Accuracy and validity of the algorithm are verified by the experimental results.
    Źródło:
    Polish Maritime Research; 2017, S 2; 81-88
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Radar target detection based on methods of image pattern matching
    Autorzy:
    Tong, L.
    Heymann, F.
    Noack, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/359156.pdf
    Data publikacji:
    2013
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    detection
    tracking
    radar images
    image pattern matching
    algorithms
    Opis:
    This paper studies the performance of pattern matching algorithms with the goal of the detection and tracking of vessel targets in maritime radar images. We compare different methods using a database which consists of radar images from two different manufactures. The data covers a timespan of roughly 4 hours with a one second time resolution. The performance of 3 template matching and 5 feature detector algorithms is tested and the most suitable algorithm is chosen for further optimizations. These optimizations are based on the properties of the radar images and the properties of the radar target.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2013, 36 (108) z. 1; 162-167
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Możliwości tworzenia numerycznego modelu pokrycia terenu ze stereopary zdjęć satelitarnych VFRS
    Possibilities of generating digital surface model from stereopairs of VHRS satellite images
    Autorzy:
    Bakuła, K.
    Woźniak, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/129650.pdf
    Data publikacji:
    2018
    Wydawca:
    Stowarzyszenie Geodetów Polskich
    Tematy:
    NMPT
    stereopara
    zdjęcia satelitarne
    dopasowanie obrazów
    DSM
    stereo-pair
    satellite imagery
    image matching
    Opis:
    Celem niniejszego artykułu było ukazanie możliwości tworzenia numerycznych modeli wysokościowych na podstawie pary satelitarnych zdjęć stereoskopowych. Zdjęcia obejmowały obszar centralnej Warszawy. Wyniki skontrolowano z modelem powstałym na podstawie lotniczego skanowania laserowego (LIDAR). Stereopara pochodziła z satelity o bardzo dużej rozdzielczości Pleiades, zaś dane LIDAR zostały pozyskane w ramach projektu ISOK. W eksperymencie analizowano wpływ parametrów gęstego dopasowania obrazów, liczby fotopunktów niezbędnej do poprawnej georeferencji scen satelitarnych wstępnie orientowanych współczynnikami RPC, oceniono dokładność względem modelu wysokościowego LIDAR z uwzględnieniem eliminacji błędów grubych oraz spowodowanych martwymi polami. Prace przeprowadzono w oprogramowaniu Trimble Inpho. Uzyskane wyniki potwierdziły możliwość zastosowania wyłącznie 2-3 fotopunktów na obszarze opracowania, aby uzyskać zadowalające wyniki orientacji, a dalej tworzonego modelu wysokościowego. W analizie dokładności modelu wysokościowego uzyskano wyniki na poziomie pojedynczego piksela. Dla terenów odkrytych przy 214 fotopunktach kontrolnych z danych LIDAR błąd wysokościowy RMS wyniósł 50 cm.
    The aim of this work was to show the possibility of generating digital surface models on the basis of satellite stereo-pair. Test area of experiment was the central part of Warsaw. The results were compared with a DSM based on the airborne laser scanning (LIDAR). The stereo-pair was collected with very high resolution satellite system Pleiades and LIDAR data was acquired within the ISOK project. In the experiment: the influence of dense image matching the parameters was analysed, impact of control points on the correctness of scenes georeferencing pre-orientated with RPC coefficients was verified, the accuracy of DSM was assessed including outliers resulted in lower spatial resolution of satellite imagery and occluded areas. The experiment was processed in the Trimble Inpho software. The results confirmed the possibility of applying only 2-3 control points in order to obtain satisfactory results of scenes orientation and consequently DSM accuracy. In the analysis of elevation models their accuracy at the level of a single ground sample distance was achieved. For uncovered areas in case of 214 LIDAR-based control points vertical RMS was 50 cm.
    Źródło:
    Archiwum Fotogrametrii, Kartografii i Teledetekcji; 2018, 30; 143-159
    2083-2214
    2391-9477
    Pojawia się w:
    Archiwum Fotogrametrii, Kartografii i Teledetekcji
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of sequential images for photogrammetrically point determination
    Autorzy:
    Kowalczyk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/131216.pdf
    Data publikacji:
    2011
    Wydawca:
    Stowarzyszenie Geodetów Polskich
    Tematy:
    close range photogrammetry
    image matching
    sequential images
    fotogrametria bliskiego zasięgu
    spasowanie obrazów
    kolejne obrazy
    Opis:
    Close range photogrammetry encounters many problems with reconstruction of objects three-dimensional shape. Relative orientation parameters of taken photos makes usually key role leading to right solution of this problem. Automation of technology process is hardly performed due to recorded scene complexity and configuration of camera positions. This configuration makes the process of joining photos into one set usually impossible automatically. Application of camcorder is the solution widely proposed in literature for support in 3D models creation. Main advantages of this tool are connected with large number of recorded images and camera positions. Exterior orientation changes barely between two neighboring frames. Those features of film sequence gives possibilities for creating models with basic algorithms, working faster and more robust, than with remotely taken photos. The first part of this paper presents results of experiments determining interior orientation parameters of some sets of frames, presenting three-dimensional test field. This section describes calibration repeatability of film frames taken from camcorder. It is important due to stability of interior camera geometric parameters. Parametric model of systematical errors was applied for correcting images. Afterwards a short film of the same test field had been taken for determination of check points group. This part has been done for controlling purposes of camera application in measurement tasks. Finally there are presented some results of experiments which compare determination of recorded object points in 3D space. In common digital photogrammetry, where separate photos are used, first levels of image pyramids are taken to connect with feature based matching. This complicated process creates a lot of emergencies, which can produce false detections of image similarities. In case of digital film camera, authors of publications avoid this dangerous step, going straightly to area based matching, aiming high degree of similarity for two corresponding film frames. First approximation, in establishing connections between photos, comes from whole image distance. This image distance method can work with more than just two dimensions of translation vector. Scale and angles are also used for improving image matching. This operation creates more similar looking frames where corresponding characteristic points lays close to each other. Procedure searching for pairs of points works faster and more accurately, because analyzed areas can be reduced. Another proposed solution comes from image created by adding differences between particular frames, gives more rough results, but works much faster than standard matching.
    Źródło:
    Archiwum Fotogrametrii, Kartografii i Teledetekcji; 2011, 22; 285-296
    2083-2214
    2391-9477
    Pojawia się w:
    Archiwum Fotogrametrii, Kartografii i Teledetekcji
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Diversity of photogrammetric approaches for multi-purpose applications
    Autorzy:
    Bujakiewicz, A.
    Markiewicz, J.
    Bakuła, K.
    Zawierska, D
    Powiązania:
    https://bibliotekanauki.pl/articles/106787.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Warszawska. Wydział Geodezji i Kartografii
    Tematy:
    photogrammetry
    computer vision
    image orientation
    data integration
    image matching
    fotogrametria
    wizja komputera
    orientacja obrazu
    integracja danych
    dopasowanie obrazu
    Opis:
    The presented paper shows the diversity of photogrommetric approaches by introducing a problem of camera interior orientation, data georeferencing. data integration and the issue of automatic object surface modelling. The authors discuss the abovementioned issues on the example of the work carried out at the Faculty of Geodesy and Cartography, Warsaw University of Technology referring to solutions practiced in Computer Vision. This article is an example of introduction of photogrammetry as a discipline open to achievements of close fields of science, which is widely applied in practice.
    Źródło:
    Reports on Geodesy and Geoinformatics; 2014, 96; 9-19
    2391-8365
    2391-8152
    Pojawia się w:
    Reports on Geodesy and Geoinformatics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of operators for detection of corners set in automatic image matching
    Autorzy:
    Zawieska, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/129929.pdf
    Data publikacji:
    2011
    Wydawca:
    Stowarzyszenie Geodetów Polskich
    Tematy:
    feature detection
    corner detection
    3D modelling
    image matching
    funkcja wykrywania
    wykrywanie krawędzi
    modelowanie 3D
    dopasowanie obrazów
    Opis:
    Reconstruction of three dimensional models of objects from images has been a long lasting research topic in photogrammetry and computer vision. The demand for 3D models is continuously increasing in such fields as cultural heritage, computer graphics, robotics and many others. The number and types of features of a 3D model are highly dependent on the use of the models, and can be very variable in terms of accuracy and time for their creation. In last years, both computer vision and photogrammetric communities have approached the reconstruction problems by using different methods to solve the same tasks, such as camera calibration, orientation, object reconstruction and modelling. The terminology which is used for addressing the particular task in both disciplines is sometimes diverse. On the other hand, the integration of methods and algorithms coming from them can be used to improve both. The image based modelling of an object has been defined as a complete process that starts with image acquisition and ends with an interactive 3D virtual model. The photogrammetric approach to create 3D models involves the followings steps: image pre-processing, camera calibration, orientation of images network, image scanning for point detection, surface measurement and point triangulation, blunder detection and statistical filtering, mesh generation and texturing, visualization and analysis. Currently there is no single software package available that allows for each of those steps to be executed within the same environment. For high accuracy of 3D objects reconstruction operators are required as a preliminary step in the surface measurement process, to find the features that serve as suitable points when matching across multiple images. Operators are the algorithms which detect the features of interest in an image, such as corners, edges or regions. This paper reports on the first phase of research on the generation of high accuracy 3D model measurement and modelling, focusing upon the application of different operators for accurate feature point extraction. The implementation of those operators is discussed and performance of differen operators is analysed. The optimal operator for high accuracy close range object reconstruction is then highlighted. This research has facilitated a development of the feature extraction and image measurement process that will be central to the development of an automatic procedure for high accuracy point cloud generation in multi image networks where robust orientation and 3D point determination will facilitate surface measurement and modelling within a single software system.
    Źródło:
    Archiwum Fotogrametrii, Kartografii i Teledetekcji; 2011, 22; 423-436
    2083-2214
    2391-9477
    Pojawia się w:
    Archiwum Fotogrametrii, Kartografii i Teledetekcji
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Template Matching Using Improved Rotations Fourier Transform Method
    Autorzy:
    Wijaya, Marvin Chandra
    Powiązania:
    https://bibliotekanauki.pl/articles/2200717.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    template matching
    Fourier transform
    three shear rotations
    image rotation
    Opis:
    Template matching is a process to identify and localize a template image on an original image. Several methods are commonly used for template matching, one of which uses the Fourier transform. This study proposes a modification of the method by adding an improved rotation to the Fourier transform. Improved rotation in this study uses increment rotation and three shear methods for the template image rotation process. The three shear rotation method has the advantage of precise and noisefree rotation results, making the template matching process even more accurate. Based on the experimental results, the use of 10°angle increments has increased template matching accuracy. In addition, the use of three shear rotations can improve the accuracy of template matching by 13% without prolonging the processing time.
    Źródło:
    International Journal of Electronics and Telecommunications; 2022, 68, 4; 881--888
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    LEDs based video camera pose estimation
    Autorzy:
    Sudars, K.
    Cacurs, R.
    Homjakovs, I.
    Judvaitis, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/200249.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    camera pose estimation
    image keypoint detection and matching
    3D point reconstruction
    object localization and tracking
    oszacowanie ustawienia kamery
    rekonstrukcja modelu 3D
    lokalizacja obiektu
    śledzenie obiektu
    Opis:
    For 3D object localization and tracking with multiple cameras the camera poses have to be known within a high precision. The paper evaluates camera pose estimation via a fundamental matrix and via the known object in environment of multiple static cameras. A special feature point extraction technique based on LED (Light Emitting Diodes) point detection and matching has been developed for this purpose. LED point detection has been solved searching local maximums in images and LED point matching has been solved involving patterned time functions for each light source. Emitting LEDs have been used as sources of known reference points instead of typically used feature point extractors like ORB, SIFT, SURF etc. In such a way the robustness of pose estimation has been obtained. Camera pose estimation is significant for object localization using the networks with multiple cameras which are going to an play increasingly important role in modern Smart Cities environments.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 4; 897-905
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Object pose estimation in monocular image using modified FDCM
    Autorzy:
    Dabbour, Abd Alrazzak
    Habib, Rabie
    Saii, Mariam
    Powiązania:
    https://bibliotekanauki.pl/articles/305648.pdf
    Data publikacji:
    2020
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    3DOF pose estimation
    FDCM
    monocular image
    Voronoi diagram
    line-based matching
    LSD
    Opis:
    In this paper, a new method for multi-object detection and pose estimation in a monocular image is proposed based on the FDCM method. This method can detect an object with a high-speed running time even if the object was under partial occlusion or bad illumination. Additionally, it only requires a single template without any training process. In this paper, a new method (MFDCM) for 3D multi-object pose estimation in a monocular image is proposed, which is based on the FDCM method with major performance improvements in accuracy and running time. These improvements were achieved by using the LSD method instead of a simple edge detector (Canny detector), using an angular Voronoi diagram instead of calculating the 3D distance transform image, a distance transform image, and an integral distance transform image at each orientation. In addition, the search process in the proposed method depends on a line segment-based search instead of the sliding window search in the FDCM. As a result, the proposed method is more robust and much faster than the FDCM method, and the position, scale, and rotation are invariant. In addition, the proposed method was evaluated and compared to different methods (COF, HALCON, LINE2D, and BOLD) using a D-textureless dataset. The comparison results show that the MFDCM has the highest score among all of the tested methods (with a slight advantage from the COF and BLOD methods) while it was a little slower than LINE2D (which was the fasted method among the compared methods). Furthermore, it was at least 14-times faster than the FDCM in the tested scenarios. The results prove that the MFDCM is able to detect and 3D pose estimate of object in a clear or clustered background from a monocular image with a high-speed running time, even if the objects are under partial occlusion; this makes it robust and reliable for real-time applications.
    Źródło:
    Computer Science; 2020, 21 (1); 97-112
    1508-2806
    2300-7036
    Pojawia się w:
    Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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