used for obtaining the reliability shown in the foregoing Moreover, these thresholds have been set taking the result Process 
expression (2) by 255 times. of edged image into account. There are many noise part, | (DUse 
They are because that the reliability is obtained at a range yet. The authors used following process to delete noise | (For | 
of 0 to 1 and in the condition as it is, it is impossible to part. | @ Use 
display as a gray-scale image. The edged result in Figure 5 has been obtained by | dete 
From these images, a part extracted originally as an edge providing the aforesaid conditions with each threshold set @ Calc 
can be confirmed clearly and a part judged to be a noise is as follows; | imag 
confirmed to be displayed darkly. | (4) Com 
From these images, it is to be understand that any edge Threshold: and ¢ 
part was deleted with noise part at this method. 
Figure3(a) Height Image(h(x,y), Target 1) 
  
Figure3(b) Height Image(h(x,y), Target 2) 
(1) Figure 5(a) 
Htu = 20, Htl = 5 and RelyLim = 0.4 
(2)Figure 5(b) 
Htu = 15, Htl = 5 and RelyLim = 0.9 
  
SANS 
NA 
   
el YE 
Figure4(b) Reliability Image(r(x, y) x 255, Ttarget 2) 
  
668