Selecting an Acquisition Type

Use the Select Acquisition Type step to select the type of the acquisition you want to perform. Complete one of the following sets of steps to select the acquisition type.

• Single Acquisition with Processing—Acquires a single image.

  Complete the following steps to configure a single acquisition with processing:

  1. Select Single Acquisition with Processing from the available configuration options.
  2. Click Next.
• Continuous Acquisition with Inline Processing—Continuously acquires images until an event stops the acquisition.

  Complete the following steps to configure a continuous acquisition with inline processing:

  1. Select Continuous Acquisition with Inline Processing from the available configuration options.
  2. Select an Acquire Image Type. The following options are available.
     • Acquire Most Recent Image—Use this mode to acquire the most recent image. This mode could miss some images, but the image returned will always be the most recent.
     • Acquire Every Image—Use this mode for applications in which acquiring every image is necessary.

       Note  If the acquisition rate is faster than the average processing rate, the Acquire Every Image mode will not be able to keep up and once all the image buffers are filled with unprocessed images, the acquisition will begin to lose images. The number of missed images is an available output of the Express VI that can be used to indicate when this condition occurs. Use a Finite Acquisition with Inline Processing acquisition if you need to acquire every image, and the acquisition rate is faster than the average processing rate.

  3. If applicable, specify the Number of Images to Buffer.
  4. Click Next.
• Finite Acquisition with Inline Processing—Acquires a specified number of images and returns each image as it is acquired. All images are allocated on the first iteration. Processing can occur while images are acquired without affecting acquisition speeds.

  Complete the following steps to configure a finite acquisition with inline processing:

  1. Select Finite Acquisition with Inline Processing from the available configuration options.
  2. Specify the Number of Images to Acquire.
  3. Click Next.
• Finite Acquisition with Post Processing—This mode is the same as Finite Acquisition with Inline Processing, except the images are only available after they are all acquired.

  Complete the following steps to configure a finite acquisition with post processing:

  1. Select Finite Acquisition with Post Processing from the available configuration options.
  2. Specify the Number of Images to Acquire.
  3. Click Next.