MATLAB IMAGE ACQUISITION TOOLBOX 3 Guía de usuario descargar pdf (Pagina 170)

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6 Working with Acquired Image Data

7 Clean up — Always rem ove image acquisition objects from mem ory, and

the variables that re ference them, when you n o longer need them.

delete(vid)

clear vid

Bringing a Single Frame into the Workspace

To brin g a sin gle frame of image d a ta into the MATLAB workspace, use the

getsnapshot function. You can call the getsnap shot function at any time

after object creation.

Thisexampleillustrateshowsimpleitistousethe

getsnapshot function.

1 Create an im age acquisition object — Th i s example creates a video

input object for a Matrox device. To run this example on your system,

use the

imaqhwinfo function to get the object constructor for your image

acquisition device a nd substitute that syntax for the following code.

vid = videoinput('mat rox',1);

2 Bring a frame into the workspace —Callthegetsnapshot function to

bringaframeintotheworkspace. Notethatyoudonotneedtostartthe

video input object before calling the

getsnapshot function.

frame = getsnapshot(v id);

The getsnapshot function returns an image of thesamewidthandheight

as spe cified by the

ROIPosition property and the same number of bands as

specified by the

NumberOfBands property. In this example, the video format

of the data is RGB so the value of the

NumberOfBands property is 3.

whos

Name Size Bytes Class

frame 96x128x3 36864 uint8 ar ray

vid 1x1 1060 videoinput object

6-10

1 2 ... 165 166 167 168 169 170 171 172 173 174 175 ... 407 408

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