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Date: Tue, 10 Dec 1996 03:34:02 GMTServer: NCSA/1.4.2Content-type: text/htmlLast-modified: Thu, 26 Jan 1995 02:19:32 GMTContent-length: 4848<!DOCTYPE HTML PUBLIC "-//W3O//DTD W3 HTML 2.0//EN"><!- Converted with LaTeX2HTML 0.6.4 (Tues Aug 30 1994) by Nikos Drakos (nikos@cbl.leeds.ac.uk), CBLU, University of Leeds -><P><HEAD><TITLE>Implementing multi-level queries <BR>in a database environment for vision research<A NAME=tex2html1 HREF="footnode.html#2"><IMG ALIGN=BOTTOM ALT="gif" SRC="http://www.cs.washington.edu/homes/speed/figs/foot_motif.gif"></A></TITLE><meta name="description" value="Implementing multi-level queries in a database environment for vision research"><meta name="keywords" value="devr-toc"><meta name="resource-type" value="document"><meta name="distribution" value="global"></HEAD><BODY><P> <BR> <HR><A NAME=tex2html6 HREF="node1.html"><IMG ALIGN=BOTTOM ALT="next" SRC="http://www.cs.washington.edu/homes/speed/figs/next_motif.gif"></A> <IMG ALIGN=BOTTOM ALT="up" SRC="http://www.cs.washington.edu/homes/speed/figs/up_motif_gr.gif"> <IMG ALIGN=BOTTOM ALT="previous" SRC="http://www.cs.washington.edu/homes/speed/figs/previous_motif_gr.gif"> <A NAME=tex2html8 HREF="node1.html"><IMG ALIGN=BOTTOM ALT="contents" SRC="http://www.cs.washington.edu/homes/speed/figs/contents_motif.gif"></A> <BR><B> Next:</B> <A NAME=tex2html7 HREF="node1.html">Contents</A><BR> <HR> <P><P><H1>Implementing multi-level queries <BR>in a database environment for vision research<A NAME=tex2html1 HREF="footnode.html#2"><IMG ALIGN=BOTTOM ALT="gif" SRC="http://www.cs.washington.edu/homes/speed/figs/foot_motif.gif"></A></H1><P><STRONG>Rex Jakobovits, Linda Shapiro, Steven Tanimoto <BR> Department of Computer Science and Engineering, FR-35<BR>University of Washington<BR>Seattle, Washington 98195<BR></STRONG><P><P><STRONG></STRONG><P><H3>Abstract:</H3><EM> The Database Environment for Vision Research (DEVR) is an entity-oriented scientific database system based on a hierarchical relational data model (HRS). This paper describes the design and implementation of the data definition language, the application programmer's interface, and the query mechanism of the DEVR system.<P> DEVR provides a dynamic data definition language for modeling image and vision data, which can be integrated with existing image processing and vision applications. Schema definitions can be fully interleaved with data manipulation, without requiring recompilation. In addition, DEVR provides a powerful application programmer's interface that regulates data access and schema definition, maintains indexes, and enforces type safety and data integrity.<P> The system supports multi-level queries based on recursive constraint trees. A set of HRS entities of a given type is filtered through a network of constraints corresponding to the parts, properties, and relations of that type. Queries can be constructed interactively with a menu-driven interface, or they can be dynamically generated within a vision application using the programmer's interface. Query objects are persistent and reusable. Users may keep libraries of query templates, which can be built incrementally, tested separately, cloned, and linked together to form more complex queries.</EM><P><P><BR> <HR><UL> <LI> <A NAME=tex2html9 HREF="node1.html#SECTION00010000000000000000">Contents</A><LI> <A NAME=tex2html10 HREF="node2.html#SECTION00020000000000000000"> INTRODUCTION</A><LI> <A NAME=tex2html11 HREF="node3.html#SECTION00030000000000000000"> THE HRS DATA MODEL</A><UL> <LI> <A NAME=tex2html12 HREF="node4.html#SECTION00031000000000000000"> Components of the HRS</A><LI> <A NAME=tex2html13 HREF="node5.html#SECTION00032000000000000000"> Example application: TRIBORS</A></UL> <LI> <A NAME=tex2html14 HREF="node6.html#SECTION00040000000000000000"> IMPLEMENTING THE HRS</A><UL> <LI> <A NAME=tex2html15 HREF="node7.html#SECTION00041000000000000000"> The Schema class</A><LI> <A NAME=tex2html16 HREF="node8.html#SECTION00042000000000000000"> The Entity class</A></UL> <LI> <A NAME=tex2html17 HREF="node9.html#SECTION00050000000000000000"> APPLICATION PROGRAMMER'S INTERFACE</A><LI> <A NAME=tex2html18 HREF="node10.html#SECTION00060000000000000000"> THE QUERY SYSTEM</A><UL> <LI> <A NAME=tex2html19 HREF="node11.html#SECTION00061000000000000000"> Query model: constraint trees</A><LI> <A NAME=tex2html20 HREF="node12.html#SECTION00062000000000000000"> Implementation of the query model</A></UL> <LI> <A NAME=tex2html21 HREF="node13.html#SECTION00070000000000000000"> Conclusion</A><LI> <A NAME=tex2html22 HREF="node14.html#SECTION00080000000000000000">References</A><LI> <A NAME=tex2html23 HREF="node15.html#SECTION00090000000000000000"> <em>About this document ...</em> </A></UL><A HREF="devr.ps"> also available in postscript </A><BR> <HR><P><ADDRESS><I> Rex Jakobovits <BR>Mon Jan 16 19:29:35 PST 1995</I></ADDRESS></BODY>⌨️ 快捷键说明
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