Download A Structural Analysis of Complex Aerial Photographs by Makoto Nagao PDF

By Makoto Nagao

It is appropriate that the 1st quantity to seem within the sequence "Advanced purposes in development acceptance" might be this monograph by way of Nagao and Matsuyama. The paintings defined here's a deep unification and synthesis of the 2 primary ways to pat­ tern popularity: numerical (also often called "statistical") and struc­ tural ("linguistic," "syntactic"). the ability and cohesion of the meth­ odology move from the it seems that easy and normal use of the knowledge-base framework illuminated by means of the simplest result of man made intelligence learn. a vital part of the paintings is the algorithmic answer of many hitherto incompletely or clumsily handled difficulties. It used to be at the get together of a laboratory stopover at in reference to the 4th IJCPR (of ~hich Professor Nagao was once the very capable software Chairman) that I observed in operation the procedure defined right here. prompt I expressed the need to work out the paintings defined for the inter­ nationwide technical viewers during this sequence and the authors have been type sufficient to comply with give a contribution to a brand new and unknown sequence. With the e-book of this monograph at the eve of the fifth ICPR my want is fu1fi11~d. i need to thank the following the authors and Plenum Publishing company for making this quantity and the sequence a reality.

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4. Focusing Mechanism of the System 25 the analysis of the picture should be done as efficiently as possible. If each very sophisticated and time-consuming objectdetection subsystem were uniformly applied to the whole picture area, it would take a prohibitive time to complete the analysis. Such a uniform analysis will require a long processing time to calculate all features of all regions in a picture, whilst most of these features may often be useless because the features required to recognize an object of one kind may be quite different from those required for others.

2. 1. Specification of the Aerial Photographs Under Analysis Before the development of remote sensing technology, only black and white (color) aerial photographs were available for surveying situations on the ground, and the analysis of the photographs was made by human specialists via visual inspection. This process, however, not only requires very specialized skills but also tends to be subjective. That is, the result of the analysis relies heavily on subjective judgements by an analyst and hence lacks objectivity.

When the edges in the small picture are mapped back onto the original picture, they are regarded as reference areas where detailed algorithms are applied to extract detailed and exact edges in the original picture. ) As the reduced picture is a smoothed version of the original picture, the edge detection in that smoothed picture becomes easier and more reliable. Moreover, as the edge detection in the original large picture is now made only in restricted local areas, the planning saves very much processing time.

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