matlab调用摄像头拍照的前期准备.docx

imaqInfo = imaqhwinfoimaqInfo = InstalledAdaptors: winvideo MATLABVersion: 7.10 (R2010a) ToolboxName: Image Acquisition Toolbox ToolboxVersion: 3.5 (R2010a) imaqInfo.InstalledAdaptorsans = winvideo winvideoinfo = imaqhwinfo(winvideo)winvideoinfo = AdaptorDllName: 1x81 char AdaptorDllVersion: 3.5 (R2010a) AdaptorName: winvideo DeviceIDs: 1 DeviceInfo: 1x1 struct winvideoinfo.DeviceInfoans = DefaultFormat: YUY2_1280x720 DeviceFileSupported: 0 DeviceName: FaceTime HD Camera (Built-in) DeviceID: 1 ObjectConstructor: videoinput(winvideo, 1) SupportedFormats: 1x6 cell device1 = winvideoinfo.DeviceInfo(1)device1 = DefaultFormat: YUY2_1280x720 DeviceFileSupported: 0 DeviceName: FaceTime HD Camera (Built-in) DeviceID: 1 ObjectConstructor: videoinput(winvideo, 1) SupportedFormats: 1x6 cell device1.DeviceNameans =FaceTime HD Camera (Built-in) device1.DeviceIDans = 1 device1.DefaultFormatans =YUY2_1280x720 device1.SupportedFormatsans = Columns 1 through 4 YUY2_1280x720 YUY2_160x120 YUY2_176x144 YUY2_320x240 Columns 5 through 6YUY2_352x288 YUY2_640x480obj= videoinput (winvideo)Summary of Video Input Object Using FaceTime HD Camera (Built-in). Acquisition Source(s): input1 is available. Acquisition Parameters: input1 is the current selected source. 10 frames per trigger using the selected source. YUY2_1280x720 video data to be logged upon START. Grabbing first of every 1 frame(s). Log data to memory on trigger. Trigger Parameters: 1 immediate trigger(s) on START. Status: Waiting for START. 0 frames acquired since starting. 0 frames available for GETDATA. get (obj) General Settings: DeviceID = 1 DiskLogger = DiskLoggerFrameCount = 0 EventLog = 1x0 struct FrameGrabInterval = 1 FramesAcquired = 0 FramesAvailable = 0 FramesPerTrigger = 10 Logging = off LoggingMode = memory Name = YUY2_1280x720-winvideo-1 NumberOfBands = 3 Previewing = off ROIPosition = 0 0 1280 720 Running = off Tag = Timeout = 10 Type = videoinput UserData = VideoFormat = YUY2_1280x720 VideoResolution = 1280 720 Color Space Settings: BayerSensorAlignment = grbg ReturnedColorSpace = YCbCr Callback Function Settings: ErrorFcn = imaqcallback FramesAcquiredFcn = FramesAcquiredFcnCount = 0 StartFcn = StopFcn = TimerFcn = TimerPeriod = 1 TriggerFcn = Trigger Settings: InitialTriggerTime = TriggerCondition = none TriggerFrameDelay = 0 TriggerRepeat = 0 TriggersExecuted = 0 TriggerSource = none TriggerType = immediate Acquisition Sources: SelectedSourceName = input1Source = 1x1 videosource imaqhelp videoinput VIDEOINPUT Functions and Properties. VIDEOINPUT Construction. videoinput - Construct a video input object. Configuration. get - Get value of image acquisition object property. inspect - Open property inspector and configure image acquisition object properties. set - Set value of image acquisition object property. Execution. getselectedsource - Return the video source object currently selected for acquisition. start - Initiate video input object to start running. stop - Stop object running and logging. wait - Wait for video input object to stop running. Trigger Functions. trigger - Manually initiate logging for running object. triggerconfig - Configure video input object to a trigger configuration. triggerinfo - Return all valid trigger configurations. Data Functions. flushdata - Remove buffered image frames from memory. getdata - Return acquired image frames from buffer. getsnapshot - Immediately acquire a single image frame. peekdata - Return most recently acquired image frames. Tools. closepreview - Close image preview windows. imaqmem - Limit or display memory used for acquiring frames. imaqmontage - Display acquired image frames as a montage. preview - Activate a live image preview window. General. delete - Remove video input object from memory. imaqcallback - Display event information for an acquisition event. imaqfind - Find image acquisition objects with specified property values. imaqreset - Delete and unload all image acquisition objects and adaptors. isvalid - True for image acquisition objects that can be associated with hardware. Information And Help. imaqhelp - Display image acquisition object function and property help. imaqhwinfo - Return information on available hardware. propinfo - Return image acquisition object property information. Image Acquisition Tutorials. demoimaq_AccessDevices - Accessing an image acquisition device. demoimaq_Acquisition - Acquiring image data to memory. demoimaq_Callbacks - Using image acquisition callbacks. demoimaq_DiskLog - Logging image data to an AVI file. demoimaq_Events - Working with image acquisition events. demoimaq_GetSnapshot - Acquiring a single image in a loop. demoimaq_IdentifyDevices - Determining available image acquisition hardware. demoimaq_Objects - Managing image acquisition objects. demoimaq_Properties - Working with image acquisition properties. demoimaq_Triggers - Working with image acquisition triggers. Application Demos. demoimaq_AcquisitionRate - Calculating the acquisition rate. demoimaq_AlphaBlending - Alpha blending image data as it is acquired. demoimaq_AlphaBlendingIPT - Alpha blending image data as it is acquired, using the Image Processing Toolbox. demoimaq_Averaging - Averaging image data as it is acquired and saving results to disk. demoimaq_IntervalLogging - Acquiring image data at a constant interval. demoimaq_Pendulum - Calculating the gravitational constant using a pendulum. demoimaq_NI_RTSI_IMAQ_IMAQ - Synchronizing two National Instruments frame grabbers via RTSI. demoimaq_NI_RTSI_IMAQ_DAQ - Synchronizing a National Instruments frame grabber and data acquisition board via RTSI. VIDEOINPUT Properties. DeviceID - Hardware device identifier. DiskLogger - Specify the MATLAB AVIFILE object used to log data. ErrorFcn - Callback function to execute when a runtime error occurs. EventLog - Information relating to specific events. FrameGrabInterval - Specify the frame buffering interval. FramesAvailable - Number of buffered frames available per source. FramesAcquired - Total number of frames acquired per source. FramesAcquiredFcn - Callback to execute every time a predefined number of frames is acquired. FramesAcquiredFcnCount - Number of frames to acquire before a frames acquired event is generated. FramesPerTrigger - Number of frames to acquire for each trigger. Logging - Indicate whether data is being logged or not. LoggingMode - Specify the destination for acquired image data. Name - Descriptive name of the video input object. ROIPosition - Specify the region of interest acquisition window. Running - Indicates if the video input object is in an acquisition state. SelectedSourceName - Currently selected video source to be used for acquisition. Source - Video source objects contained by a video input object. StartFcn - Callback function to execute just before the video input object and hardware device start executing. StopFcn - Callback function to execute just after the video input object and hardware device stop executing. Tag - Label for object. Timeout - Waiting time to extract image data. TimerFcn - Callback function to execute whenever a predefined period of time passes. TimerPeriod - Period of time between timer events. TriggerCondition - Condition on which a trigger is issued. TriggerFcn - Callback function to execute when a trigger occurs. TriggerFrameDelay - Delay value for logging image frames. TriggerRepeat - Number of additional times to repeat a trigger. TriggersExecuted - Number of triggers executed. TriggerSource - Trigger source that initiates the acquisition. TriggerType - Type of trigger to issue. Type - Object type. UserData - User data for object. VideoFormat - Video input format from the hardware. VideoResolution - Vector indicating the image width and height for the incoming video signal. VIDEOSOURCE Properties. Parent - Indicates the video source object parent. Selected - Indicates if the video source object is currently selected. SourceName - Indicates the name of a video source. Tag - User defined string for the video source object. Type - Object type. Note: Additional device-specific video source properties may also be available. See also videoinput, imaqhelp, imaqdevice/propinfo. Reference page in Help browser doc videoinput/Contents VIDEOINPUT Create video input object. OBJ = VIDEOINPUT(ADAPTORNAME) OBJ = VIDEOINPUT(ADAPTORNAME,DEVICEID) OBJ = VIDEOINPUT(ADAPTORNAME,DEVICEID,FORMAT) OBJ = VIDEOINPUT(ADAPTORNAME,DEVICEID,FORMAT,P1,V1,.) OBJ = VIDEOINPUT(ADAPTORNAME) constructs the video input object, OBJ. A video input object represents the connection between MATLAB and a particular image acquisition device. ADAPTORNAME is a text string that specifies the name of the adaptor used to communicate with the device. Use the IMAQHWINFO function to determine the adaptors available on your system. OBJ = VIDEOINPUT(ADAPTORNAME,DEVICEID) constructs a video input object OBJ, where DEVICEID is a numeric scalar value that identifies a particular device available through the specified adaptor, ADAPTORNAME. Use the IMAQHWINFO(ADAPTORNAME) syntax to determine the devices available through the specified adaptor. If DEVICEID is not specified, the first available device ID is used. As a convenience, a devices name can be used in place of the DEVICEID. If multiple devices have the same name, the first available device is used. OBJ = VIDEOINPUT(ADAPTORNAME,DEVICEID,FORMAT) constructs a video input object, where FORMAT is a text string that specifies a particular video format supported by the device or the full path of a device configuration file (also known as a camera file). To get a list of the formats supported by a particular device, view the DEVICEINFO structure for the device that is returned by the IMAQHWINFO function. Each DEVICEINFO structure contains a SUPPORTEDFORMATS field. If FORMAT is not specified, the devices default format is used. When the video input object is created, its VIDEOFORMAT field contains the format name or device configuration file that you specify. OBJ = VIDEOINPUT(ADAPTORNAME,DEVICEID,FORMAT,P1,V1,.) creates a video input object OBJ with the specified property values. If an invalid property name or property value is specified, the object is not created. The property name and property value pairs