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Chapter 4 Programming with NI-IMAQ for 1394 VIs
NI-IMAQ for IEEE-1394 Cameras User Manual 4-4 ni.com
Buffer Management
IMAQ Create and IMAQ Dispose manage image buffers in LabVIEW.
IMAQ Create, shown in Figure 4-2, allocates an image buffer. Image
Name is a label for the buffer created. Each buffer must have a unique
name. Image Type specifies the typeof image being created. Use 8bitsfor
8-bit monochrome images and 16 bits for 16-bit monochrome images,
RGB forRGBcolorimages.
Note
If Image Type is set to a value incompatible with the current video mode, it will
automatically change to a compatible value.
New Image contains pointer information to the buffer, which is initially
empty. When you wire New Image to the Image in input of an image
acquisition VI, the image acquisition VI allocates the correct amount of
memory for the acquisition. If you are going to process the image, you
might need to wire to Border Size. Border Size is the width in pixels
created around an image. Some image processing functions, such as
labeling or morphology, require a border.
Figure 4-2. IMAQ Create
IMAQ Dispose, shown in Figure 4-3, frees the memory allocated for the
image buffer. Call this VI only after the image is no longer required for
processing.
Figure 4-3. IMAQ Dispose