23.2   Image Preprocessing

Border Cut

Use the Border Cut parameter to cut off N% of the border. Let us assume we want to cut off 10 % of the border, enter 10 to the Border textbox.

Mask

Use the mask, (x, y, w, h, “Mask Type”), to set the mask. Here (x, y) are the coordinates of the upper left corner, w is the width, and h is the height.

•    When the “Mask Type” parameter in  (x, y, w, h, “Mask Type”) is set to 1, the units for (x, y, w, h) are pixels. Let a mask be (20, 20, 70, 70, 1), then the cut is based on pixel value.
•    When the “Mask Type” is set to 2, the units are percent. For example, let a mask be in (20, 20, 70, 70, 2), then the original is modified by cutting off 20 % of the border on the top, 20% on the left, 10% on the right, and 10% on the bottom. Here 2 in (20, 20, 70, 70, 2) means in percentage rather than pixels.

Stick Shift

Use “Stick Shift” to speed up the computation. The range for this parameter is between 0 to 5, with 0 being the slowest and 5 being the fastest.

Skip Empty Border

Skip Percent

Skip Threshold Filter

Skip Edge Filter

Use the “Skip Empty Border” to specifies the type:

    0   No skip;

    1   Skip the white empty border space;

    2   Skip the black empty border space;

    3   Skip x percent of the contents on the white background space;

    4   Skip x percent of the contents on the black background space;

    5   Skip empty border space on user defined Threshold Filter;

    6   Skip x percent of the contents on user defined Threshold/Edge Filters.

 

Once the type is chosen:

“Skip Percent” specifies the percent of contents to be cut for Options 4, 5, & 6.

“Skip Threshold Filter” specifies the Threshold Filter used for Options 5 & 6, and

“Skip Edge Filter” specifies the Edge Filter used for Options 5 and 6.

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