ClassesClasses | | Operators

grab_datagrab_dataGrabDataGrabData (Operator)

Name

grab_datagrab_dataGrabDataGrabData — Synchronous grab of images and preprocessed image data from the specified image acquisition device.

Signature

grab_data( : Image, Region, Contours : AcqHandle : Data)

Herror grab_data(Hobject* Image, Hobject* Region, Hobject* Contours, const Hlong AcqHandle, char* Data)

Herror T_grab_data(Hobject* Image, Hobject* Region, Hobject* Contours, const Htuple AcqHandle, Htuple* Data)

void GrabData(HObject* Image, HObject* Region, HObject* Contours, const HTuple& AcqHandle, HTuple* Data)

HRegion HImage::GrabData(HXLDCont* Contours, const HFramegrabber& AcqHandle, HTuple* Data)

HRegion HImage::GrabData(HXLDCont* Contours, const HFramegrabber& AcqHandle, HString* Data)

HImage HRegion::GrabData(HXLDCont* Contours, const HFramegrabber& AcqHandle, HTuple* Data)

HImage HRegion::GrabData(HXLDCont* Contours, const HFramegrabber& AcqHandle, HString* Data)

HImage HFramegrabber::GrabData(HRegion* Region, HXLDCont* Contours, HTuple* Data) const

HImage HFramegrabber::GrabData(HRegion* Region, HXLDCont* Contours, HString* Data) const

static void HOperatorSet.GrabData(out HObject image, out HObject region, out HObject contours, HTuple acqHandle, out HTuple data)

HRegion HImage.GrabData(out HXLDCont contours, HFramegrabber acqHandle, out HTuple data)

HRegion HImage.GrabData(out HXLDCont contours, HFramegrabber acqHandle, out string data)

HImage HRegion.GrabData(out HXLDCont contours, HFramegrabber acqHandle, out HTuple data)

HImage HRegion.GrabData(out HXLDCont contours, HFramegrabber acqHandle, out string data)

HImage HFramegrabber.GrabData(out HRegion region, out HXLDCont contours, out HTuple data)

HImage HFramegrabber.GrabData(out HRegion region, out HXLDCont contours, out string data)

Description

The operator grab_datagrab_dataGrabDataGrabDataGrabData grabs images and preprocessed image data via the image acquisition device specified by AcqHandleAcqHandleAcqHandleAcqHandleacqHandle. The desired operational mode of the image acquisition device as well as a suitable image part and additional interface-specific settings can be specified using the operators open_framegrabberopen_framegrabberOpenFramegrabberOpenFramegrabberOpenFramegrabber and set_framegrabber_paramset_framegrabber_paramSetFramegrabberParamSetFramegrabberParamSetFramegrabberParam. Depending on the current configuration of the image acquisition device, the preprocessed image data can be returned in terms of images (ImageImageImageImageimage), regions (RegionRegionRegionRegionregion), XLD contours (ContoursContoursContoursContourscontours), and control data (DataDataDataDatadata).

To abort the grab, the operator set_framegrabber_paramset_framegrabber_paramSetFramegrabberParamSetFramegrabberParamSetFramegrabberParam with the parameter 'do_abort_grab' can be used if the specific image acquisition interface supports it. Note that as an exception from the description of the concurrent usage in multiple threads (see below) 'do_abort_grab' can also be used from another thread.

Attention

For a multithreaded application all image acquisition operators (as listed in open_framegrabberopen_framegrabberOpenFramegrabberOpenFramegrabberOpenFramegrabber) are an own group in which info_framegrabberinfo_framegrabberInfoFramegrabberInfoFramegrabberInfoFramegrabber, open_framegrabberopen_framegrabberOpenFramegrabberOpenFramegrabberOpenFramegrabber, close_framegrabberclose_framegrabberCloseFramegrabberCloseFramegrabberCloseFramegrabber and close_all_framegrabbersclose_all_framegrabbersCloseAllFramegrabbersCloseAllFramegrabbersCloseAllFramegrabbers are executed exclusively.

grab_datagrab_dataGrabDataGrabDataGrabData runs in parallel with all non-exclusive operators inside and outside of this group.

Execution Information

Parameters

ImageImageImageImageimage (output_object)  image(-array) objectHImageHImageHobject * (byte / real / uint2)

Grabbed image data.

RegionRegionRegionRegionregion (output_object)  region(-array) objectHRegionHRegionHobject *

Preprocessed image regions.

ContoursContoursContoursContourscontours (output_object)  xld_cont(-array) objectHXLDContHXLDContHobject *

Preprocessed XLD contours.

AcqHandleAcqHandleAcqHandleAcqHandleacqHandle (input_control)  framegrabber HFramegrabber, HTupleHTupleHtuple (integer) (IntPtr) (Hlong) (Hlong)

Handle of the acquisition device to be used.

DataDataDataDatadata (output_control)  string(-array) HTupleHTupleHtuple (string / real / integer) (string / double / int / long) (HString / double / Hlong) (char* / double / Hlong)

Preprocessed control data.

Example (HDevelop)

* Select a suitable image acquisition interface name AcqName
info_framegrabber(AcqName,'port',Information,Values)
* Open image acquisition device using the default settings, see
* documentation of the actually used interface for more details
open_framegrabber(AcqName,1,1,0,0,0,0,'default',-1,'default',-1.0, \
                  'default','default','default',-1,-1,AcqHandle)
* Grab and segment image
grab_data (Image, Region, Contours, AcqHandle, Data)
* Process Region...
close_framegrabber(AcqHandle)

Example (C)

/* Select a suitable image acquisition interface name AcqName */
info_framegrabber(AcqName,"port",&Information,&Values) ;
/* Open image acquisition device using the default settings, see
   documentation of the actually used interface for more details */
open_framegrabber(AcqName,1,1,0,0,0,0,'default',-1,'default',-1.0,
                  'default','default','default',-1,-1,&AcqHandle) ;
/* Grab and segment image */
grab_data(&Region,AcqHandle) ;
/* Process Region... */
close_framegrabber(AcqHandle) ;

Example (HDevelop)

* Select a suitable image acquisition interface name AcqName
info_framegrabber(AcqName,'port',Information,Values)
* Open image acquisition device using the default settings, see
* documentation of the actually used interface for more details
open_framegrabber(AcqName,1,1,0,0,0,0,'default',-1,'default',-1.0, \
                  'default','default','default',-1,-1,AcqHandle)
* Grab and segment image
grab_data (Image, Region, Contours, AcqHandle, Data)
* Process Region...
close_framegrabber(AcqHandle)

Example (HDevelop)

* Select a suitable image acquisition interface name AcqName
info_framegrabber(AcqName,'port',Information,Values)
* Open image acquisition device using the default settings, see
* documentation of the actually used interface for more details
open_framegrabber(AcqName,1,1,0,0,0,0,'default',-1,'default',-1.0, \
                  'default','default','default',-1,-1,AcqHandle)
* Grab and segment image
grab_data (Image, Region, Contours, AcqHandle, Data)
* Process Region...
close_framegrabber(AcqHandle)

Example (HDevelop)

* Select a suitable image acquisition interface name AcqName
info_framegrabber(AcqName,'port',Information,Values)
* Open image acquisition device using the default settings, see
* documentation of the actually used interface for more details
open_framegrabber(AcqName,1,1,0,0,0,0,'default',-1,'default',-1.0, \
                  'default','default','default',-1,-1,AcqHandle)
* Grab and segment image
grab_data (Image, Region, Contours, AcqHandle, Data)
* Process Region...
close_framegrabber(AcqHandle)

Result

If the image acquisition device is open and supports the image acquisition via grab_datagrab_dataGrabDataGrabDataGrabData, the operator grab_datagrab_dataGrabDataGrabDataGrabData returns the value 2 (H_MSG_TRUE). Otherwise an exception is raised.

Possible Predecessors

open_framegrabberopen_framegrabberOpenFramegrabberOpenFramegrabberOpenFramegrabber, grab_image_startgrab_image_startGrabImageStartGrabImageStartGrabImageStart, set_framegrabber_paramset_framegrabber_paramSetFramegrabberParamSetFramegrabberParamSetFramegrabberParam

Possible Successors

grab_data_asyncgrab_data_asyncGrabDataAsyncGrabDataAsyncGrabDataAsync, grab_image_startgrab_image_startGrabImageStartGrabImageStartGrabImageStart, grab_imagegrab_imageGrabImageGrabImageGrabImage, grab_image_asyncgrab_image_asyncGrabImageAsyncGrabImageAsyncGrabImageAsync, set_framegrabber_paramset_framegrabber_paramSetFramegrabberParamSetFramegrabberParamSetFramegrabberParam, close_framegrabberclose_framegrabberCloseFramegrabberCloseFramegrabberCloseFramegrabber

See also

open_framegrabberopen_framegrabberOpenFramegrabberOpenFramegrabberOpenFramegrabber, info_framegrabberinfo_framegrabberInfoFramegrabberInfoFramegrabberInfoFramegrabber, set_framegrabber_paramset_framegrabber_paramSetFramegrabberParamSetFramegrabberParamSetFramegrabberParam

Module

Foundation


ClassesClasses | | Operators