Rockwell Automation 5370-CVIM2 Module User Manual

Page 75

Chapter 3

Image Acquisition Parameters

3–36

however, the

Acq.Phase (Pixels)

value can be set within the following

range:

*(640 –

Acq. Pixels

)

Value

)(640 –

Acq. Pixels

)

NOTE: Changing the

Acq. Pixels

and

Acq. Phase

values does not affect

the image acquisition time.

The example in Figure 3.26 shows the effect of changing the value of the

Acq. Phase (Pixels)

parameter to 64 (with the

Acq. Pixels (Pixels)

parameter set to 512, in this case). Note that this image appears shifted to the
left, compared to the “512” image shown in Figure 3.25 (page 3–35). In fact,
the leftmost 64 pixels of the image are truncated in this case.

Figure 3.26 Example: Effect of Maximum Acq. Phase Setting on Displayed Image

Acq. Pixels = 512

Acq. Phase = 64

In Figure 3.27 (A) on page 3–37, the dotted lines show that the center of the
512 acquired pixels is centered in the full 640–pixel image when

Acq.

Phase (Pixels)

is set is 0. In Figure 3.27 (B), the dotted lines show that the

center of the 512 acquired pixels has moved 64 pixels to the right when the

Acq. Phase (Pixels)

is set is 64 (this is the example shown in Figure 3.26).

Note that the reverse would be true if the

Acq. Phase (Pixels)

were set to

–64. In that case, the displayed image would appear shifted to the right.

In another example, shown in Figure 3.27 (C), if you wanted only the
rightmost 200 pixels in the image to be acquired, you could set

Acq. Phase

(Pixels)

to 220 and

Acq. Pixels (Pixels)

to 200.