Analysing crime scene reports
Download
1 / 14

Analysing Crime-Scene Reports - PowerPoint PPT Presentation


  • 169 Views
  • Updated On :

Analysing Crime-Scene Reports. Scene of Crime Information System. Katerina Pastra and Horacio Saggion University of Sheffield. Outline. Project Overview SOCIS Architecture Corpus Linguistic Analysis Pointers. Project Overview. 2000 - 2003.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Analysing Crime-Scene Reports' - Anita


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
Analysing crime scene reports l.jpg

Analysing Crime-Scene Reports

Scene of Crime Information System

Katerina Pastra and Horacio Saggion

University of Sheffield


Outline l.jpg
Outline

  • Project Overview

  • SOCIS Architecture

  • Corpus

  • Linguistic Analysis

  • Pointers


Project overview l.jpg
Project Overview

2000 - 2003

  • Domain: Scene of Crime Investigation (SOC)

  • Main Features :

    1. Multimedia briefing

    • · Summarisation of text and images

  • 2. Generation

    • · Of formal reports & of photo albums

      3. Intelligent Search


  • Project overview 2 l.jpg
    Project Overview (2)

    • Other systems for Crime Investigation:

      · Academic R&D Projects

      · Governmental agencies’ Systems

      · Commercial Systems

      BUT: SOCIS brings ‘intelligence’ to CI systems

    • The ‘Digital Evidence in Court’ issue:

      · Authenticity has to be verified

      ·Recently accepted in court


    A view of socis l.jpg

    +

    Image processing

    Text processing

    Integrated Knowledge Base

    A view of SOCIS


    Text processing l.jpg
    Text Processing

    • - Text Corpus

    • - Information Extraction system

    • >> Named Entities Recognition

    • >> Co-reference Resolution

    • Need:

    • Linguistic Analysis of the Language at the SOC

    • Lexical Information

    • Morphosyntactic Information

    • Semantic Information


    The corpus l.jpg
    The Corpus

    4 days spent with a SOCO:

    12 scenes visited * 2 complete case files examined * official documentation collected

    • Official documentation :

      SOC Reports = 77

      Photo Indexes = 300

      Witness Statements = 14

    • Reported SOC Information :

      Press Association = 792

      Washington Post = 233

      Crime Watch = 8

    • Reports - Photo indexes Witness statements Photographs

    • For the same case

    • For major crime

    • Of significant quantity

    NEEDED



    Soc language characteristics l.jpg
    SOC Language Characteristics

    • General Characteristics:

      • Telegraphic

      • Descriptive

      • Accurate

      • Objective

    Special text type : Reports


    Lexical information l.jpg
    Lexical Information

    Characteristics:

    - Extensive use of abbreviations

    - Jargon

    Creation of Word - Lists (gazetteers):

    - Based on PITO’s CDM

    - Over 200 lists (domain + general)

    Words of interest are assigned a semantic category


    Morphosyntactic features l.jpg
    Morphosyntactic Features

    • Extensive Ellipsis

    • Simple temporal dimensions

    • Limited co-ordination

    • Sub-ordination avoided

    • POS : NPs, PPs

    • Adjuncts of place - time, Qualifiers

    For identifying entities of interest automatically,

    we need to write specific rules using:

    • The word lists + Context Information




    Pointers l.jpg
    Pointers

    • SOCIS Sheffield Web Page

      http://www.dcs.shef.ac.uk/nlp/socis

      

    • SOCIS Surrey Web Page

      http://www.computing.surrey.ac.uk/ai/socis

      

    • NLP Group

      http://www.dcs.shef.ac.uk/nlp