Theory and Algorithms

Terms of Reference

• Algorithms for geometric determination and analysis of photogrammetric data
• Feature extraction from multi-sensor, multi-resolution, multi-temporal imagery
• Image understanding
• Integrated sensor orientation
• Image sequence analysis
• Algorithms for digital photogrammetric systems and their GIS integration
• GIS concepts, with particular emphasis on integration of image data
• Merging theories from remote sensing and computer vision to interpret multi-sensor, multi-spectral and multi-resolution imagery
• Quality control, verification and performance measures of algorithms
• Theory and algorithms for synthetic aperture radar

WORKING GROUPS of ISPRS COMMISSION III

• WG III/1 - Integrated Sensor Calibration and Orientation
• WG III/2 - Algorithms for Surface Reconstruction
• WG III/3 - Feature Extraction and Grouping
• WG III/4 - Image Understanding/Object Recognition
• WG III/5 - Remote Sensing and Vision Theories for Automatic Scene Interpretation
• WG III/6 - Theory and algorithms for SAR

WG III/1 - Integrated Sensor Calibration and Orientation

WG III/1  Terms of Reference

• Single- and multi-sensor system calibration
• Automatic sensor orientation using GPS and INS information, and digital image processing techniques
• Automatic aerial triangulation
• Combination of sensor orientation and calibration algorithms with 3D scene reconstruction algorithms
• Multi-sensor information integration, e.g. aerial and satellite imagery, radar data, multi-spectral imagery, in conjunction with WG III/2

WG III/2 - Algorithms for Surface Reconstruction

WG III/2  Terms of Reference

• Algorithms for surface reconstruction from different cues, such as stereo, shading, shadows, texture, and spectral properties
• Integration of information from different sources, including aerial and satellite imagery, radar data, range data, multiple images, and GIS data
• Automatic verification and quality control of reconstructed surfaces
• Interrelations between matching and interpolation
• Role of surface reconstruction in automatic scene analysis

WG III/3 - Feature Extraction and Grouping

WG III/3  Terms of Reference

• Segmentation of images into meaningful features, such as points, edges, and regions
• Investigation of the impact of geometric and radiometric image formation on image segmentation
• Aggregation of features by iterated grouping methods
• Verification of global consistencies by optimization techniques
• Investigation of the potential of performing grouping processes in 3D under special consideration of object space constraints, precision and reliability
• Evaluation of the performance of feature extraction and grouping algorithms in cooperation with similar efforts in computer vision

WG III/4 - Image Understanding/Object Recognition

WG III/4  Terms of Reference

• Theoretical/conceptual investigations in 3D object recognition and image understanding
• Spatial modelling of human-built and natural objects like buildings, roads, or vegetation (geometric modelling, semantic modelling)
• Theory and algorithms for automation of 3D object recognition and object extraction
• Knowledge engineering with emphasis on knowledge encapsulation, knowledge representation and manipulation
• Integration of multiple sources (DTM, GIS, colour, etc.) in cooperation with WG III/5
• Performance characterization of algorithms (quality control, test procedures) jointly with WG III/3

WG III/5 - Remote Sensing and Vision Theories for Automatic Scene Interpretation

WG III/5  Terms of Reference

• Merging theories from remote sensing (classification) and computer vision for Object Recognition/Image Understanding (OR/IU), to analyze and interpret multi-spectral, multi-sensor imagery
• Exploration of the potential of scale space theory on multi-spectral and hyper-spectral imagery; extending the theory by including the spectrum
• Combination of modelling efforts of real world objects in GIS, digital photogrammetry and computer vision
• Investigation of the possibility of constraining the 3D image understanding and object recognition problem by GIS information, in cooperation with IC WG IV/III.2 and WG VII/4

WG III/6 - Theory and algorithms for SAR

WG III/6  Terms of Reference

• Theory and algorithms for SAR, particularly for interferometry and feature extraction
• Establishment of state-of-the art radar mapping
• Geometric relationships in processing and interpreting SAR data
• Quality control aspects of radar images and derived products, such as radar maps and DTMs