Rockwell-automation 5370-CVIM2 Module User Manual download pdf (Page 317)

Chapter

Chapter 7

Inspection Tools

7–79

This section provides detailed information about the six arithmetic operations

listed in the Image Operation selection panel (Figure 7.51, page 7–61) and

illustrates the effects that these operations have on image features.

An image arithmetic operation is an appropriate choice when an arithmetic

combination of two images is required in order to extract the relevant

features of a workpiece, or enhance them, for inspection purposes.

Image arithmetic operations can be performed on a gray scale or binary

image, or on a combination of gray scale and binary images. When two gray

scale images are added or subtracted, the resulting image will be a gray scale

image. Similarly, when two binary images are added or subtracted, the

resulting image will be a binary image.

When one image is gray scale and the other is binary, however, the binary

image is treated as a “mask,” with the following consequences for both

addition and subtraction:

S2, SȀ, or T

Pn or Bn

Gray Black Gray

Gray White Black

The image arithmetic operations use the abbreviations S1 and S2, S1’, or T

to represent the specific image sources to be accessed in each operation.

They are described briefly as follows:

• S1 –– This is the primary image source for all image arithmetic

operations. It is specified in the toolset edit panel under the “S1” heading,

and it can be an image from either a camera (C1 – C6) or from another

image processing tool (P1 – P3 or B1 – B3).

• S2 –– This is the secondary image source for the S1 – S2 and S1 + S2

operations. It is specified in the toolset edit panel in the “S2” column, and

it can be an image from either a camera (C1 – C6) or from another image

processing tool (P1 – P3 or B1 – B3). (Note that S1 and S2 cannot

specify the same image source for any one image tool. For example, C1

cannot be specified as both S1 and S2 for the same image tool.)

• S1’ –– This is the secondary image source for the S1 – S1’ and S1 + S1’

operations. It is always a part of the S1 image.

• T –– This is the secondary image source for the S1 – T and S1 + T

operations. It is always a “template” image that was saved from either the

S1 image or from some other image.

During configuration, S1, S2, and S1’ are each represented as an “area of

interest” (AOI), and they are configured using the

and

buttons in the tool edit panel. The template image T is configured using the

Image Manager panel.

Image Tool Operations:

Image Arithmetic

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Rockwell-automation 5370-CVIM2 Module User Manual Page 317

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