MATLAB IMAGE ACQUISITION TOOLBOX - RELEASE NOTES Guide de l'utilisateur télécharger pdf (Page 103)

Supporting ROIs

5-25

Note You use the ROI width and height when you create the frame but you use the full

image width and height when you copy the image data from the buffer into the frame

object.

Example

The following is a version of the isSendFrame() loop in the acquisition thread function

that checks the ROI. Note that you call the getROI() function to get the ROI values, and

then use the width and height values in the call to makeFrame() and the offsets from the

origin in the call to setImage().

if (adaptor->isSendFrame()) {

// Get ROI information.

int roiOriginX, roiOriginY, roiWidth, roiHeight;

adaptor->getROI(roiOriginX,

roiOriginY,

roiWidth,

roiHeight);

// Get frame type & dimensions

imaqkit::frametypes::FRAMETYPE frameType =

adaptor->getFrameType();

int imWidth = adaptor->getMaxWidth();

int imHeight = adaptor->getMaxHeight();

// Create a frame object

imaqkit::IAdaptorFrame* frame =

adaptor->getEngine()->makeFrame(frameType,

roiWidth, // ROI width

roiHeight); // ROI height

// Copy data from buffer into frame object

frame->setImage(imBuffer,

imWidth, // Full image width

imHeight, // Full image height

roiOriginX, // ROI origin

roiOriginY); // ROI origin

// Set image's timestamp

frame->setTime(imaqkit::getCurrentTime());

// Send frame object to engine.

adaptor->getEngine()->receiveFrame(frame);

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MATLAB IMAGE ACQUISITION TOOLBOX - RELEASE NOTES Guide de l'utilisateur Page 103