Accession Number : ADA260705


Title :   Efficient Generation of Synthetic Terrain Imagery for Automatic Target Recognition


Descriptive Note : Final rept. 1 May 1989-30 Jun 1992


Corporate Author : PURDUE UNIV LAFAYETTE IN ROBOT VISION LAB


Personal Author(s) : Kak, A C ; Cromwell, R L ; Blask, S G ; Grewe, L L ; Kang, H


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a260705.pdf


Report Date : 23 Oct 1992


Pagination or Media Count : 11


Abstract : We have developed an integrated framework for the efficient synthesis of realistic images of three dimensional terrain with man-made objects and natural clutter. We have shown how many phenomenological aspects of the placement of road networks, tree clusters, populated areas, buildings, etc., can be captured in a computationally-efficient pseudorandom image-generation framework. We generate the underlying terrain with a fast Fourier based procedure. This procedure is seeded with a pseudorandom sequence, so a small number of parameters can characterize a distinctive class of terrain. Within each class, arbitrarily many scenes can be synthesized. We have used procedural definitions for objects; targets or clutter are represented by different models depending on range. For example, at a great distance trees may look like simple cones. But, as the viewpoint nears a tree, finer details will become visible. Procedural definitions also eliminate the need to explicitly store boundary representations for every object placed in the scene. A single procedural definition for an object, such as a tree, can be used at render time by a Z-buffer algorithm to create as many instances as are necessary, with each instance being unique since it uses a unique pseudorandom seed.... Automatic target recognition, Image synthesis, Computer modeling, Z-buffer.


Descriptors :   *IMAGE PROCESSING , *TARGET RECOGNITION , *TERRAIN MODELS , ALGORITHMS , BUFFERS , NETWORKS , COMPUTERS , BUILDINGS , TARGETS , TIME , SEEDS , AUTOMATIC , NUMBERS , ROADS , RECOGNITION , IMAGES , TREES , THREE DIMENSIONAL , BOUNDARIES , STORES , SEQUENCES , TERRAIN , CLUTTER , PARAMETERS , SYNTHESIS , MODELS , COMPUTERIZED SIMULATION


Subject Categories : Cartography and Aerial Photography
      Target Direction, Range and Position Finding


Distribution Statement : APPROVED FOR PUBLIC RELEASE