info_framegrabberT_info_framegrabberInfoFramegrabberInfoFramegrabber (Operator)

Name

info_framegrabberT_info_framegrabberInfoFramegrabberInfoFramegrabber — Query information about the specified image acquisition interface.

Signature

Description

The operator info_framegrabberinfo_framegrabberInfoFramegrabberInfoFramegrabberInfoFramegrabber returns information about the image acquisition device NameNameNameNamename. The desired information is specified via QueryQueryQueryQueryquery. A textual description according to the selected topic is returned in InformationInformationInformationInformationinformation. If applicable, ValueListValueListValueListValueListvalueList contains a list of supported values. Up to now, the following queries are possible:

'bits_per_channel':

List of all supported values for the parameter 'BitsPerChannel', see open_framegrabberopen_framegrabberOpenFramegrabberOpenFramegrabberOpenFramegrabber.

'camera_type':

Description and list of all supported values for the parameter 'CameraType', see open_framegrabberopen_framegrabberOpenFramegrabberOpenFramegrabberOpenFramegrabber.

'color_space':

List of all supported values for the parameter 'ColorSpace', see open_framegrabberopen_framegrabberOpenFramegrabberOpenFramegrabberOpenFramegrabber.

'defaults':

Interface-specific default values in ValueListValueListValueListValueListvalueList, see open_framegrabberopen_framegrabberOpenFramegrabberOpenFramegrabberOpenFramegrabber.

'device':

List of all supported values for the parameter 'Device', see open_framegrabberopen_framegrabberOpenFramegrabberOpenFramegrabberOpenFramegrabber.

'external_trigger':

List of all supported values for the parameter 'ExternalTrigger', see open_framegrabberopen_framegrabberOpenFramegrabberOpenFramegrabberOpenFramegrabber.

'field':

List of all supported values for the parameter 'Field', see open_framegrabberopen_framegrabberOpenFramegrabberOpenFramegrabberOpenFramegrabber.

'general':

General information (in InformationInformationInformationInformationinformation).

'generic':

Generic value with device-specific meaning, see open_framegrabberopen_framegrabberOpenFramegrabberOpenFramegrabberOpenFramegrabber.

'horizontal_resolution':

List of all supported values for the parameter 'HorizontalResolution', see open_framegrabberopen_framegrabberOpenFramegrabberOpenFramegrabberOpenFramegrabber.

'image_height':

List of all supported values for the parameter 'ImageHeight', see open_framegrabberopen_framegrabberOpenFramegrabberOpenFramegrabberOpenFramegrabber.

'image_width':

List of all supported values for the parameter 'ImageWidth', see open_framegrabberopen_framegrabberOpenFramegrabberOpenFramegrabberOpenFramegrabber.

'info_boards':

Information about actually installed boards or cameras. This data is especially useful for the auto-detect mechanism of the Image Acquisition Assistant in HDevelop.

'line_in':

List of all supported values for the parameter 'LineIn', see open_framegrabberopen_framegrabberOpenFramegrabberOpenFramegrabberOpenFramegrabber.

'parameters':

List of all interface-specific parameters which are accessible via set_framegrabber_paramset_framegrabber_paramSetFramegrabberParamSetFramegrabberParamSetFramegrabberParam or get_framegrabber_paramget_framegrabber_paramGetFramegrabberParamGetFramegrabberParamGetFramegrabberParam.

'parameters_readonly':

List of all interface-specific parameters which are only accessible via get_framegrabber_paramget_framegrabber_paramGetFramegrabberParamGetFramegrabberParamGetFramegrabberParam.

'parameters_writeonly':

List of all interface-specific parameters which are only accessible via set_framegrabber_paramset_framegrabber_paramSetFramegrabberParamSetFramegrabberParamSetFramegrabberParam.

'port':

List of all supported values for the parameter 'Port', see open_framegrabberopen_framegrabberOpenFramegrabberOpenFramegrabberOpenFramegrabber.

'revision':

Version number of the image acquisition interface.

'start_column':

List of all supported values for the parameter 'StartColumn', see open_framegrabberopen_framegrabberOpenFramegrabberOpenFramegrabberOpenFramegrabber.

'start_row':

List of all supported values for the parameter 'StartRow', see open_framegrabberopen_framegrabberOpenFramegrabberOpenFramegrabberOpenFramegrabber.

'vertical_resolution':

List of all supported values for the parameter 'VerticalResolution', see open_framegrabberopen_framegrabberOpenFramegrabberOpenFramegrabberOpenFramegrabber.

Please check also the directory 'doc/html/reference/acquisition'"doc/html/reference/acquisition""doc/html/reference/acquisition""doc/html/reference/acquisition""doc/html/reference/acquisition" for documentation about specific image grabber interfaces.

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.

Thus, info_framegrabberinfo_framegrabberInfoFramegrabberInfoFramegrabberInfoFramegrabber, open_framegrabberopen_framegrabberOpenFramegrabberOpenFramegrabberOpenFramegrabber, close_framegrabberclose_framegrabberCloseFramegrabberCloseFramegrabberCloseFramegrabber and close_all_framegrabbersclose_all_framegrabbersCloseAllFramegrabbersCloseAllFramegrabbersCloseAllFramegrabbers block the concurrent execution of all other operators within this group, but run in parallel with all non-exclusive operators outside of this group.

On Windows Systems, error dialog boxes from the operating system can occur when dependency modules of the interface are not found, e.g., the according SDK was not installed. The occurrence of the error boxes can be controlled by setting Windows' Error Mode. Please refer to the description of SetErrorMode within the Windows MSDN documentation.

Execution Information

• Multithreading type: reentrant (runs in parallel with non-exclusive operators).
• Multithreading scope: global (may be called from any thread).
• Processed without parallelization.

Parameters

* 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_image(Image,AcqHandle)
close_framegrabber(AcqHandle)

/* 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_image(Image,AcqHandle) ;
close_framegrabber(AcqHandle) ;

* 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_image(Image,AcqHandle)
close_framegrabber(AcqHandle)

* 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_image(Image,AcqHandle)
close_framegrabber(AcqHandle)

* 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_image(Image,AcqHandle)
close_framegrabber(AcqHandle)

Result

If the parameter values are correct and the specified image acquistion interface is available, info_framegrabberinfo_framegrabberInfoFramegrabberInfoFramegrabberInfoFramegrabber returns the value 2 (H_MSG_TRUE). Otherwise an exception is raised.

Possible Predecessors

open_framegrabberopen_framegrabberOpenFramegrabberOpenFramegrabberOpenFramegrabber

Possible Successors

open_framegrabberopen_framegrabberOpenFramegrabberOpenFramegrabberOpenFramegrabber

See also

open_framegrabberopen_framegrabberOpenFramegrabberOpenFramegrabberOpenFramegrabber

Module

Foundation