TABLE 1
Category
Condition
1
Intensity of C < Intensities of two neighboring pixels
2
Intensity of C < Intensity of one neighboring pixel and
intensity of C = Intensity of one neighboring pixel
3
Intensity of C > Intensity of one neighboring pixel and
intensity of C = Intensity of one neighboring pixel
4
Intensity of C > Intensities of two neighboring pixels
0
No correspondence
In Table 1, C represents a current pixel. Category 1 in Table 1 corresponds to FIG. 9(a), Category 2 in Table 1 corresponds to FIG. 9(b), Category 3 in Table 1 corresponds to FIG. 9(c), and Category 4 in Table 1 corresponds to FIG. 9(d).