Có 16+ tài liệu thuộc chủ đề "hình ảnh địa chất"
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1 Digital Imagery: Fundamentals. 1.1 DIGITAL IMAGERY. Digital imagery plays a valuable role in numerous human activities, such as law enforcement, agriculture and forestry management, earth science, urban planning, as well as sports, newscasting, and entertainment.. This chapter provides an overview of the topics covered in this book. We first describe several applications of digital imagery, some of which are...
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2 Visible Image Retrieval. The emergence of multimedia, the availability of large digital archives, and the rapid growth of the World Wide Web (WWW) have recently attracted research efforts in providing tools for effective retrieval of image data based on their content (content-based image retrieval, CBIR). The relevance of CBIR for many applications, ranging from art galleries and museum archives...
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Section 3.7 addresses the implications of the variety of collection systems, processing, and usage patterns on the storage and access of remotely sensed image data. Section 3.9 concludes the chapter with a summary of the key points.. Some of the interesting facts from these references are summarized in the following text to illustrate the variety of applications and the breadth...
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Medical imaging has its roots in the accidental discovery of a new class of electromagnetic radiation, X rays, by Wilhelm Conrad Roentgen in 1895. The first X-ray radiograph ever taken was of his wife’s hand, revealing a picture of the living skeleton [1]. In the subsequent decades, physicians refined the art of X-ray radiography to image the structural and physiological...
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This survey yields a 3D image of the subsurface.. If these wireline images and other supporting data suggest that hydrocarbons are present in the trap, then a core might be acquired over the small interval of interest for detailed analysis of the rock.. The late 1990s also saw the explosion of the Internet and the associated evolution of tools and...
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Rapid advances in computing and communication technologies coupled with the dramatic growth of the Internet have led to the emergence of a wide variety of multimedia applications, such as distance education, on-line virtual worlds, immersive telepresence, and scientific visualization. The rest of the chapter is organized as follows. In order to explore the viability of various placement models for storing...
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An integral component of the multimedia infrastructure is a multimedia database management system. Such a system supports mechanisms to extract and represent the content of multimedia objects, provides efficient storage of the content in the database, supports content-based queries over multimedia objects, and provides a seamless integration of the multimedia objects with the traditional information stored in existing databases. Techniques...
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The appropriate compression strategy is a function of the type of signal to be compressed. Each component can be considered to be an “image. Compression of the higher-dimensional multicomponent data is possible, it is very uncommon, so we concentrate on 2D image compression.. Compression can be thought of as redundancy reduction. Compression can be performed in one of the two...
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With the explo- sive growth of the internet, the need for mechanisms that support rapid browsing of on-line imagery has become critical.. Another type of transmission, growing in popularity with archives of large digital images, is called progressive transmission. The latter decreases with the effectiveness of the compressed algorithm: the bigger the achieved compression ratio, the smaller the transmission cost....
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10.1 INTRODUCTION. The first is primarily text-based, whereas the second relies on visual properties of the data [3].. In the early 1990s, because of the emergence of large-scale image collec- tions, content-based image retrieval (CBIR) was proposed as a way to overcome these difficulties. However, in specific applications, such as medical or petroleum imaging, low-level features play a substantial role...
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11.1 INTRODUCTION. 11.1.1 Content-Based Query Systems. 11.1.2 Content-Based Query-by-Color. Each of these approaches for content-based query-by-color involves the design of color descriptors, including the selection of the color feature space and a distance metric for measuring the similarity of the color features.. 11.1.3 Outline. Section 11.2 analyzes the three main aspects of color feature extraction, namely, the choice of a...
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12.1 INTRODUCTION. 12.1b). In medical image analysis, texture is used to classify magnetic resonance (MR) images of the brain into gray and white matter or to detect cysts in X-ray computed tomography (CT) images of the kidneys. In doing so we associate each pixel in the image to a corresponding class label , the label of the region to which...
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Clearly, the manage- ment of such databases must rely on the perceptual and cognitive dimensions of the visual space, namely, color, texture, shape, and so on. The use of shape as a cue is less developed than the use of color or texture, mainly because of the inherent complexity of representing it. This chapter reviews and discusses the representation of...
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thus x[i] is the ith component of the vector x. For example, the color histogram and the color moments are descriptors of the color feature. The selection of the window size and stride is application-dependent. Noncorrect k- nearest-neighbor query processing misses some of the desired results, and therefore is also nonexhaustive.. Much can be gained, however, if one or more...
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15.1 INTRODUCTION. In this case, the objects are time series, or, more general, vector fields, that is, tuples of the form, <. For example, in weather data [5], geologic, environmental, and astrophysics databases, and so on, we want to ask queries of the form “find previous days in which the solar magnetic wind showed patterns similar to today’s pattern” to...
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16.1), and the features used for indexing are extracted directly from the pixels of the original image. We now present the details of the various compressed-domain image-indexing techniques along with derived approaches.. The magnitudes of the coefficients are translation invariant.. Spatial domain correlation can be computed by the product of the transforms.. Several properties of the DFT are useful in...