imaqhwinfo

Information about available image acquisition hardware

Syntax

out = imaqhwinfo
out = imaqhwinfo(adaptorname)
out = imaqhwinfo(adaptorname,field)
out = imaqhwinfo(adaptorname, deviceID)
out = imaqhwinfo(obj)
out = imaqhwinfo(obj,field)


Description

out = imaqhwinfo returns out, a structure that contains information about the image acquisition adaptors available on the system. An adaptor is the interface between MATLAB^® and the image acquisition devices connected to the system. The adaptor's main purpose is to pass information between MATLAB and an image acquisition device via its driver.

out = imaqhwinfo(adaptorname) returns out, a structure that contains information about the adaptor specified by the character vector adaptorname. The information returned includes adaptor version and available hardware for the specified adaptor. To get a list of valid adaptor names, use the imaqhwinfo syntax.

out = imaqhwinfo(adaptorname,field) returns the value of the field specified by the character vector field for the adaptor specified by the character vector adaptorname. The argument can be a single character vector or a cell array of character vectors. If field is a cell array, out is a 1-by-n cell array where n is the length of field. To get a list of valid field names, use the imaqhwinfo('adaptorname') syntax.

out = imaqhwinfo(adaptorname, deviceID) returns out, a structure containing information about the device specified by the numeric device ID deviceID. The deviceID can be a scalar or a vector. If deviceID is a vector, out is a 1-by-n structure array where n is the length of deviceID.

out = imaqhwinfo(obj) returns out, a structure that contains information about the specified image acquisition object obj. The information returned includes the adaptor name, device name, video resolution, native data type, and device driver name and version. If obj is an array of device objects, then out is a 1-by-n cell array of structures where n is the length of obj.

out = imaqhwinfo(obj,field) returns the information in the field specified by field for the device object obj. field can be a single field name or a cell array of field names. out is an m-by-n cell array where m is the length of obj and n is the length of field. You can return a list of valid field names with the imaqhwinfo(obj) syntax.

Note

After you call imaqhwinfo once, hardware information is cached by the toolbox. To force the toolbox to search for new hardware that might have been installed while MATLAB was running, use imaqreset.

Note

To get a list of options you can use on a function, press the Tab key after entering a function on the MATLAB command line. The list expands, and you can scroll to choose a property or value. For information about using this advanced tab completion feature, see Using Tab Completion for Functions.

Examples

This example returns information about all the adaptors available on the system.

imaqhwinfo

ans = 

InstalledAdaptors: {'matrox'  'winvideo'}
        MATLABVersion: '7.4 (R2007a)'
          ToolboxName: 'Image Acquisition Toolbox'
       ToolboxVersion: '2.1 (R2007a)'

This example returns information about all the devices accessible through a particular adaptor.

info = imaqhwinfo('winvideo')
info = 

       AdaptorDllName: [1x73 char]
    AdaptorDllVersion: '2.1 (R2007a)'
          AdaptorName: 'winvideo'
            DeviceIDs: {[1]}
           DeviceInfo: [1x1 struct]

This example returns information about a specific device accessible through a particular adaptor. You identify the device by its device ID.

dev_info = imaqhwinfo('winvideo', 1)

dev_info = 

          DefaultFormat: 'RGB555_128x96'
    DeviceFileSupported: 0
             DeviceName: 'IBM PC Camera'
               DeviceID: 1
  VideoInputConstructor: 'videoinput('winvideo', 1)'
 VideoDeviceConstructor: 'imaq.VideoDevice('winvideo', 1)'       
       SupportedFormats: {1x34 cell}

This example gets information about the device associated with a particular video input object.

obj = videoinput('winvideo', 1);

obj_info = imaqhwinfo(obj)

obj_info = 

                AdaptorName: 'winvideo'
                 DeviceName: 'IBM PC Camera'
                  MaxHeight: 96
                   MaxWidth: 128
             NativeDataType: 'uint8'
               TotalSources: 1
    VendorDriverDescription: 'Windows WDM Compatible Driver'
        VendorDriverVersion: 'DirectX 9.0'

This example returns the value of a particular field in the device information associated with a particular video input object.

field_info = imaqhwinfo(vid,'adaptorname')
field_info =

winvideo