Laser pulse analysis for reconstruction and classification of urban objects

B. Jutzi, U. Stilla

Research output: Contribution to journalConference articlepeer-review

40 Scopus citations

Abstract

Current pulsed laser radar systems for topographic applications are based on time-of-flight ranging techniques to determine the range of the illuminated object. The signal analysis to determine the time-of-flight typically operates with analogous threshold detection. In this paper we describe investigations for digital recording of received laser pulses and a detailed analysis of the pulse waveform. Recording the complete signal is advantageous because it allows processing depending on different tasks, respecting intermediate results, and considering neighbourhood relations. Two different techniques for measurement of time resolved laser pulses are presented. An experimental system for a fast recording of signals was constructed. For principal investigations a test board with urban materials was measured by single photon detection technique and visualized by a data cube. Based on these spatio-temporal data, different features are extracted and depicted by grey value images to describe macro, meso, and micro structures. Measurements were carried out with partial occlusion of the test board by vegetation. Multiple reflections are counted by processing the data cube using a spatio-temporal filter and peak detector. Initial results of object segmentation are shown.

Original languageEnglish
Pages (from-to)151-156
Number of pages6
JournalInternational Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences - ISPRS Archives
Volume34
StatePublished - 2003
Externally publishedYes
Event2003 ISPRS Workshop on Photogrammetric Image Analysis, PIA 2003 - Munich, Germany
Duration: 17 Sep 200319 Sep 2003

Keywords

  • Object recognition
  • Pulsed laser radar
  • Urban areas
  • Waveform analysis

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