Basler raL2048-48gm User Manual download pdf (Page 179)

AW00118302000 Standard Features

Basler racer GigE 169

10.3 Image Area of Interest

The image area of interest (image AOI) feature (AOI for short) lets you specify a portion of the

sensor line. During operation, only the pixel information from the specified portion of the line is

transmitted out of the camera. The AOI also specifies the width of a frame. For more information

about a frame and how to specify it, see Section 8.1 on page 75.

One of the main advantages of the AOI feature is that decreasing the size of the AOI can increase

the camera’s maximum allowed acquisition line rate. For more information about how changing the

AOI size affects the maximum allowed line rate, see Section 8.5 on page 135.

The area of interest is referenced to the left end of the sensor array. The outer left pixel of the sensor

is designated as pixel 0 (see Fig. 52).

The location and size of the area of interest is defined by declaring an offset X and a width. For

example, suppose that you specify the offset X as 10 and the width as 25. The area of the array that

is defined by these settings is shown in Figure 52. With these settings, the camera will read out and

transmit pixel values for pixels 15 through 34.

Fig. 52: Image Area of Interest

10.3.1 Setting the Image AOI

By default, the AOI is set to use the full resolution of the camera’s sensor. You can change the size

and the position of the AOI by changing the values of the camera’s Offset X and Width parameters.

You can also enable automatic X centering using the Center X parameter (see below).

When you are setting the camera’s area of interest, you must follow this guideline: The sum of the

Offset X setting plus the Width setting must not exceed the width of the camera’s sensor. For

example, on the raL2048-48gm, the sum of the Offset X setting plus the Width setting must not

exceed 2048.

For information about the contribution of the image AOI feature to defining a frame and for code

snippets illustrating how to set the Offset X and Width parameters using the API, see Section 8.1

on page 75.

Normally, the X Offset and Width parameter settings refer to the physical line of

the sensor. But if binning is enabled, these parameters are set in terms of a

"virtual" line. For more information about binning, see Section 10.6 on page 177.

Offset X in pixels

Width in pixels

= Image area of interest: pixels included in each acquisition

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Basler raL2048-48gm User Manual Page 179