By Ronne Randall

ISBN-10: 0721495486

ISBN-13: 9780721495484

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However, many three-dimensional sensing methods assess state variables indirectly, and these data require considerable subsequent interpretation. To reconstruct the necessary three- or four-dimensional data set, inferences must be made by using the physical relationship of the measured property to the ultimate property that one is interested in measuring. For example, when X-rays are used to map the three-dimensional structure of internal organs, a procedure known as computerized tomography (CT), what is actually being measured is the X-ray absorption of electromagnetic radiation through biological tissue, which is proportional to atomic number.

4) allow corresponding images to be measured while the observer views a stereomodel. However, the observer must continually adjust the position of the left and right images because stereocomparators do not automatically maintain the stereomodel. The real advantage of stereocomparators is that by viewing a stereomodel, the observer can ensure that corresponding left and right images of every target are correctly correlated. Reliable correlation of target coordinates measured on a monocomparator, depending on the number and distribution of targets, can be a very difficult task.

Interested readers are directed to Ehrenberg (1979). In addition, for a general review of different methods, see Foote (1991). An interesting alternative approach to fish size estimation is to measure the Doppler spread of a narrow-band acoustic signal and relate this to tail beat velocity, which is in turn related to fish length. Holliday (1972, 1974) has also suggested a possible approach to fish identification through the use of wide-band sonar. Because each species has a characteristic size and shape of swim bladder, at a given body length, the frequency content of the reflection from a school of fish will be enhanced at the frequencies corresponding to the resonant frequencies of their swim bladders.

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Baby Farm Animals (Happytime Baby Animals) by Ronne Randall


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