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Fig. 4. Only pixels in gray are considered for the computation of the mean value of each center pixel.

Figure 4 Only pixels in gray are considered for the computation of the mean value of each center pixel.

Related Figures (11)

Fig. 1. Example of the complexity of object characteristics within the given image data (MOMS-02, panchromatic band, spatial res- olution 4.5 m) and the difficulties of standard segmentation tech- niques: (a) Farmland in Zimbabwe with agricultural fields of dif- ferent shape, size, albedo, and details within the field boundaries. (b)—(e) segmentation results of a subset of (a): (b) segment bound- aries (in white) of a manual segmentation performed by a human expert, (c) resulting segments of an ISODATA clustering in five classes, each segment separated by a different gray value, (d) seg- ments of a watershed segmentation which was applied on an am- plitude image of the smoothed original, (e) segments of a region growing algorithm.
Fig. 1. Example of the complexity of object characteristics within the given image data (MOMS-02, panchromatic band, spatial res- olution 4.5 m) and the difficulties of standard segmentation tech- niques: (a) Farmland in Zimbabwe with agricultural fields of dif- ferent shape, size, albedo, and details within the field boundaries. (b)—(e) segmentation results of a subset of (a): (b) segment bound- aries (in white) of a manual segmentation performed by a human expert, (c) resulting segments of an ISODATA clustering in five classes, each segment separated by a different gray value, (d) seg- ments of a watershed segmentation which was applied on an am- plitude image of the smoothed original, (e) segments of a region growing algorithm.
Fig. 2. Scheme of edge and region-based image segmentation for the extraction of large, man-made objects.
Fig. 2. Scheme of edge and region-based image segmentation for the extraction of large, man-made objects.
Fig. 3. Method for the detection of model-edges at one scale.
Fig. 3. Method for the detection of model-edges at one scale.
Fig. 5. New region growing criteria. Examples of region growing situations before (a) and after (b) applying the new edge criterion as well as before (c) and after (d) the use of the bottleneck condition.
Fig. 5. New region growing criteria. Examples of region growing situations before (a) and after (b) applying the new edge criterion as well as before (c) and after (d) the use of the bottleneck condition.
Fig. 6. Results of the different processing steps for the test scene of Fig. 1(a): (a) detected model-edges, (b) smoothed image, (c) result of edge-guided region growing, (d) result after merge of small regions.
Fig. 6. Results of the different processing steps for the test scene of Fig. 1(a): (a) detected model-edges, (b) smoothed image, (c) result of edge-guided region growing, (d) result after merge of small regions.
Fig. 7. Results of the different processing steps for a test scene of agricultural fields in Germany recorded by the IRS-C sensor. (a) Original image, (b) detected model-edges, (c) smoothed image, (d) result of edge-guided region growing, (e) result after merge of small regions.
Fig. 7. Results of the different processing steps for a test scene of agricultural fields in Germany recorded by the IRS-C sensor. (a) Original image, (b) detected model-edges, (c) smoothed image, (d) result of edge-guided region growing, (e) result after merge of small regions.
Fig. 8. Further segmentation results. (a) Aerial image of agricultural fields in Germany, (b) IKONOS scene of Berlin, Germany, (c) anc (d) results of the edge guided region growing for (a) and (b), (e) and (f) final results after merge of small regions.
Fig. 8. Further segmentation results. (a) Aerial image of agricultural fields in Germany, (b) IKONOS scene of Berlin, Germany, (c) anc (d) results of the edge guided region growing for (a) and (b), (e) and (f) final results after merge of small regions.
Fig. 9. Result of applying the mean-shift algorithm [9] to Fig. l(a). (a) Result using the segmentation class of the program code with intermediate resolution (over-segmentation), (b) result using the segmentation class with the lowest resolution (under-segmentation).
Fig. 9. Result of applying the mean-shift algorithm [9] to Fig. l(a). (a) Result using the segmentation class of the program code with intermediate resolution (over-segmentation), (b) result using the segmentation class with the lowest resolution (under-segmentation).
Default values of image-independent parameters Table 1
Default values of image-independent parameters Table 1
Table 2 Value ranges of image-dependent parameters for the presented applications Value ranges of image-dependent parameters for the presented applications Table 2
Table 2 Value ranges of image-dependent parameters for the presented applications Value ranges of image-dependent parameters for the presented applications Table 2
Fig. 10. Result of eCognition applied to Fig. 7(a). (a) Example of over-segmentation with insufficient emphasis on shape information, (b) example of less over-segmented objects (higher scale value) and increased weight on shape parameters. Solid, dotted, and dashed squares indicate examples of problematic, i.e. low contrast, boundary parts.
Fig. 10. Result of eCognition applied to Fig. 7(a). (a) Example of over-segmentation with insufficient emphasis on shape information, (b) example of less over-segmented objects (higher scale value) and increased weight on shape parameters. Solid, dotted, and dashed squares indicate examples of problematic, i.e. low contrast, boundary parts.
Related topics:
Region growingShape AnalysisElectrical and Electronic EngineeringHigh Resolution Satellite Imagery
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