tailieunhanh - Hanbook of Multisensor Data Fusion P2

As seen in this example, symbol recognition (., reading) is clearly a perceptual process. It is a form of context-sensitive model-based processing. The converse process, that of representing perceptions symbolically for purpose of recording or communicating them, produces a physical product — text, sounds, etc. Such physical products must be interpreted as symbols before their informational content can be accessed | communication or storage. The set of symbolic representations available to the person is his informational state. Informational state can encompass available data stores such as databases and documents. The notion of informational state is probably more applicable to a closed system . a nonnetworked computer than to a person for whom the availability of information is generally a matter of degree. The tripartite view of reality developed by Waltz17 extends the work of philosopher Karl Popper. The status of information as a separable aspect of reality is certainly subject to discussion. Symbols can have both a physical and a perceptual aspect they can be expressed by physical marks or sounds but their interpretation . recognizing them orthographically as well as semantically is a matter of perception. As seen in this example symbol recognition . reading is clearly a perceptual process. It is a form of context-sensitive model-based processing. The converse process that of representing perceptions symbolically for purpose of recording or communicating them produces a physical product text sounds etc. Such physical products must be interpreted as symbols before their informational content can be accessed. Whether there is more to information than these physical and perceptual aspects remains to be demonstrated. Furthermore the distinction between information and perception is not the difference between what a person knows and what he thinks cf. Plato s Theatetus in which knowledge is shown to involve true opinion plus some sense of understanding . Nonetheless the notion of informational state is useful as a topic for estimation because knowing what information is available to an entity . an enemy commander s sources of information is an important element in estimating and influencing his perceptual state and therefore in predicting and influencing changes. The person acts in response to his perceptual state thereby affecting his and the rest of the world s

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