23.4   Normalization

Reduction Filter Drop Down List

Use the “Reduction Filter Drop Down List” to select a Reduction Filter. When reducing images, a scaling factor can be introduced easily. Although Scaling symmetry can compensate for this scaling factor, the Scaling symmetry is expensive. The Internal Reduction parameter is introduced to avoid unnecessary scaling.

There are several ways to reduce images:

•    Integer;
•    Real; or
•    All images are reduced by a same amount. (Customized Version Only)

Integer Reduction

Images are reduced by an integer factor to maximally fit 100x100 without distortion. For example, a 350x230 image will be reduced to 87x57.

Real Reduction

Images are reduced by a real number to maximally fit 100x100 without distortion. For example, a 350x230 image will be reduced to 100x65.

All

All training images and images in the search-directory are reduced by the same integer to fit 100x100 without distortion. (Customized Version Only) 

Within each type of reduction, there are 3 more settings:

•    Avg: AOI (Area Of Interest) is half black and half white;
•    Max: AOI is mostly white, or the black areas are thin lines; or
•    Min: AOI is mostly black.

Reduction Filter Parameter / Segment-Cut Button

Use the “Segment-Cut” button to shape the segment considered by the ImageFinder. The Segment-Cut parameter ranges from 0 to 12. This parameter deals with the edges of segments in the images. The larger this parameter is, the smaller the segment the ImageFinder will use. The possible settings of this parameter in the user interface are: 0, 1, 2, ... , and 12. To set the parameter, keep clicking the button.

Reduction Filter Parameter/Size-Cut Button

Use the "Size-Cut" button to limit the dimensions of the images to be searched. In some applications, the users only want to search images of certain dimensions and ignore the other images.

The dimension setting ranges from 0 to 9. To set the parameter, keep clicking the “Dimension” button; the setting will switch from one to the next each time you click the button.

•    If the setting is 0, this parameter will be ignored.
•    If the parameter is 1, then the longest edge of the image to be considered must be at least 100, but less than 199.
•    If the parameter is 2, then the longest edge of the image to be considered must be at least 200, but less than 299, …

Reduction Filter Parameter / Border-Cut

Use the “Border-Cut” button to ignore the sections of the image near the borders. The Border-Cut parameter ranges from 0 (no cut) to 9 (18% border cut). The possible settings in the user interface are: 0, 1, 2, ..,and 9.

Assume an image is (0,0; 1,1):

•    setting Border-Cut to 1 means the ImageFinder will look at the section (0.02, 0.02; 0.98, 0.98);
•    setting Border-Cut to 2 means the ImageFinder will look at the section (0.04, 0.04; 0.96, 0.96); … .
•    To set the parameter, keep clicking the button.

Reduction Filter Parameter / Look-At Area

The “Look-At Area” is the area the ImageFinder will use. A 100 x 100 window specifies a whole image. In the Integer-Reduction, the actual area can be less than 100x100.  The Look-At Area is specified by 4 numbers:

    (x, y, w, h)

(x, y) are the coordinates of the upper-left corner and (w, h) are the width and height of the Look-At window.

To use this Look-At window, enter values for (x, y, w, h) in the four textboxes. Note that the image display area in the ImageFinder is 300x300, therefore, the training segment is specified within a 300x300 area. The Look-At window is 100x100. The default value is (0,0,0,0), meaning the Look-At area setting is ignored.

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