National Instruments Image Acqusition Software NI-IMAQdx Manual De Usuario

© National Instruments Corporation

The IMAQ Create VI and IMAQ Dispose VI manage image buffers in 
LabVIEW. 

IMAQ Create, shown in Figure 4-1, allocates an image buffer. Image 
Name is a label for the buffer created. Each buffer must have a unique 
name. Image Type specifies the type of image being created. Use 
Grayscale (U8) for 8-bit monochrome images, Grayscale (I16) for 16-bit 
monochrome images, and RGB (U32) for RGB color images.

If Image Type is set to a value incompatible with the current video mode, 

NI-IMAQdx automatically changes the value to a compatible one when acquiring images.

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 provide a value for Border Size. Border Size is the width, 
in pixels, of a border created around an image. Some image processing 
functions, such as labeling or morphology, require a border.

Figure 4-1.  IMAQ Create

IMAQ Dispose, shown in Figure 4-2, frees the memory allocated for the 
image buffer. Call this VI only after the image is no longer required for 
processing.

Figure 4-2.  IMAQ Dispose