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Proceedings Paper

Finding thresholds for image segmentation
Author(s): Theo E. Schouten; Maurice S. Klein Gebbinck; Ron P.H.M. Schoenmakers; Graeme G. Wilkinson
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Paper Abstract

Segmentation methods for images often have cost functions which evaluate the (dis)similarity between pixels or segments. Thresholds on cost values are then used to decide whether or not to grow, join or split segments. The results for a given image critically depend on the selection of the threshold values. In remote sensing, a too low threshold will split up regions of constant ground cover and a too high threshold will join adjacent regions of different ground cover. Optimal thresholds can be determined using different classes of methods: generating cost value distributions from the original image; obtaining statistical distributions from segmented images; comparing a 'true' segmentation with the results of segmentation using a range of thresholds. A so-called 'true' segmentation can be derived from human expert segmentations or from maps obtained by ground surveys or segmentation of higher resolution images. Also artificial images can be generated having the advantage that the segmentation is known to sub-pixel level. Several methods for threshold determination are described for a hybrid segmentation method developed by us. Measures are described for comparison of two segmentations. Results are evaluated using several (parts of) LANDSAT images and artificial generated images.

Paper Details

Date Published: 30 December 1994
PDF: 12 pages
Proc. SPIE 2315, Image and Signal Processing for Remote Sensing, (30 December 1994); doi: 10.1117/12.196706
Show Author Affiliations
Theo E. Schouten, Katholieke Univ. Nijmegen (Netherlands)
Maurice S. Klein Gebbinck, Katholieke Univ. Nijmegen (Netherlands)
Ron P.H.M. Schoenmakers, Telecom Italia (Italy)
Graeme G. Wilkinson, Institute for Remote Sensing Applications (United Kingdom)

Published in SPIE Proceedings Vol. 2315:
Image and Signal Processing for Remote Sensing
Jacky Desachy, Editor(s)

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