Fig 1.
Flowchart of the histogram-based technique.
Fig 2.
Hierarchical-histogram of each plane of R, G, and B of the image Moon obtained by AHHT.
Fig 3.
The image Moon: (a) original image, (b) initial segmented result (225 colors), (c) final segmented result (4 colors).
Fig 4.
The image Birds: (a) original image, (b, c) initial segmented result and result after region merging based on the histon, (d, e) initial segmented result and result after region merging based on the roughness index, (f, g) initial segmented result and result after region merging based on AHHT.
Fig 5.
The image Church: (a) original image, (b, c) initial segmented result and result after region merging based on the histon, (d, e) initial segmented result and result after region merging based on the roughness index, (f, g) initial segmented result and result after region merging based on AHHT.
Fig 6.
The image Mountain: (a) original image, (b, c) initial segmented result and result after region merging based on the histon, (d, e) initial segmented result and result after region merging based on the roughness index, (f, g) initial segmented result and result after region merging based on AHHT.
Fig 7.
The image Marsh: (a) original image, (b, c) initial segmented result and result after region merging based on the histon, (d, e) initial segmented result and result after region merging based on the roughness index, (f, g) initial segmented result and result after region merging based on AHHT.
Fig 8.
The image Boating: (a) original image, (b, c) initial segmented result and result after region merging based on the histon, (d, e) initial segmented result and result after region merging based on the roughness index, (f, g) initial segmented result and result after region merging based on AHHT.
Fig 9.
The image Snake: (a) original image, (b, c) initial segmented result and result after region merging based on the histon, (d, e) initial segmented result and result after region merging based on the roughness index, (f, g) initial segmented result and result after region merging based on AHHT.
Table 1.
Comparison of the number of thresholds and the color number in the initial segmented result and the result after merging.
Table 2.
Comparison between the mean number of colors in the initial segmented result and the result after merging.
Table 3.
Comparison MSE, F(I) and Q(I) evaluation function of segmentation results.
Table 4.
Comparison average of MSE, F(I) and Q(I) on BSDS300 and on BSDS500.
Table 5.
Comparison averages of PRI, BDE, GCE and VOI on BSDS300.
Table 6.
Mean execution time (in seconds) of different algorithms.