17.3 Impose a Mask
Let us assume we want to cut off 20 % of the border on top, 20% on the left, 10% on the right, and 10% on the bottom, then enter (20, 20, 70, 70, 2) to the second row textboxes in Figure 17.2 and we will have 17.5.
Click the Original Button in Figure 17.4 and Preprocessing button in Figure 17.4, you will see the second image is the first image with a mask (20%, 20%, 70%, 70%). Here 2 in (20, 20, 70, 70, 2) means in percentage rather than pixels. You will see that the second image is the first image with the following cut: cut off 20 % of the border on top, 20% on the left, 10% on the right, and 10% on the bottom.
Figure 17.5 Mask (20, 20, 70, 70, 2).
Now, if we use pixels rather than percentage, enter (20, 20, 70, 70, 1) to the second row textboxes in Figure 17.2 and we will have 17.6.
Figure 17.6 Mask (20, 20, 70, 70, 1).
Copyright (c) 1998 - 2006 Attrasoft, Inc. All rights reserved.