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Chapter 2 Basic Acquisition with NI-IMAQdx
© National Instruments Corporation 2-9 NI-IMAQdx User Manual
Decoding images requires CPU resources. However, many of the decoding
algorithms have been optimized in the driver. If you do not want decoded
image data, you can use NI-IMAQdx to get a copy of the raw camera
output.
Programming Examples
This section contains examples of high-level and low-level image
acquisitions. Refer to the Example Programs section of Chapter 1,
Introduction to NI-IMAQdx, for directory paths to the code examples
discussed in this section.
High-Level Function Examples
Use high-level functions to write programs quickly without having to learn
the details of the low-level API and driver.
Snap
A snap acquires a single image into a user buffer. Figure 2-2 illustrates the
typical programming order of a high-level snap acquisition.
Figure 2-2. High-Level Snap Flowchart
Use a snap for low-speed or one-shot applications where ease of
programming is essential. When you invoke a snap, the driver opens
a session on a camera and initializes the camera. Opening a session
sets the ROI to the size of the settings you configured in MAX.
Open
Opens and configures camera
Executes user-specific image
processing
Closes the camera session
Acquires image into buffer
Snap
User-Specific Functions
Close