Feature Extraction and Image Processing

Introduction to texture description, segmentation and classification 307

(a) Hair (b) Skin

Figure 8.6 Training regions for classification

shown in Figure 8.7(b). The resolution is clearly very poor: the image has effectively been

reduced to a set of 7 7 regions but it is much faster, requiring only 2% of the computation

of the convolution approach.

A comparison with the result achieved by uniform thresholding is given, for comparison,

in Figure 8.7(c). This is equivalent to pixel segmentation by brightness alone. Clearly, there

are no regions where the hair and skin are mixed and in some ways the result appears

superior. This is in part due to the ...