Chunk Features; What Are Chunk Features; Using Chunk Features - Basler acA2040-55 User Manual

Features

7.23 Chunk Features

Chunk features are not available for the acA1920-155 camera.

7.23.1 What are Chunk Features?

In most cases, enabling a camera feature will simply change the behavior of the camera. The Test
Image feature is a good example of this type of camera feature. When the Test Image feature is
enabled, the camera outputs a test image rather than a captured image.
When chunk features are enabled, the camera
develops some sort of information about each image that it acquires and

adds the information to each image as a trailing data "chunk" when the image is transferred to

the host computer.
Examples of this type of camera feature are the Gain chunk feature and the Timestamp chunk
feature:
When the Gain chunk feature is used, the camera checks, after an image is captured, the Gain

All parameter value used for the image acquisition and develops a data chunk.
When the Timestamp chunk feature is used, the camera develops a time stamp data chunk.

The gain data chunk and the timestamp data chunk are appended as trailing data to the related

image data as the image is transferred from the camera.
After the data chunks were transmitted to the computer they must be retrieved. For more
information about retrieving chunk data, see Section 7.23.5 on

7.23.2 Using Chunk Features

Using chunk features is a three step process:
Use the Chunk Selector parameter to select the desired chunk feature, e.g. the Gain chunk

feature.
Set the Chunk Enable parameter to true to prepare the selected chunk feature to be

appended to image data
Set the Chunk Mode Active parameter to true to generate chunk data for the selected chunk

feature and append them to the related image data.
If you want to use more than one chunk feature, you can prepare several chunk features by using
Chunk Selector and Chunk Enable before setting the Chunk Mode Active parameter.
For more information about the three steps, see below.
338
AW00123409000
page 348.
Basler ace USB 3.0