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preview
The event structure contains the following fields:
Field Description
Data
Current image frame specified as an H- by-W-by-B
matrix where H and W are the image height and
width, respectively, as specified in the
ROIPosition
property, and B is the number of color bands, as
specified in the
NumberOfBands property.
Resolution
String specifying current image width and height, as
defined by the
ROIPosition property.
Status
String describing the current acquisition status of the
video input object.
Timestamp
String specifying the timestamp associated with the
current image frame.
See Also ancestor, closepr eview, image, imaqhelp, stoppreview
12-46
- Image Acquisition 1
- Toolbox 3 1
- User’s Guide 1
- 508-647-7000 (Phone) 2
- 508-647-7001 (Fax) 2
- The MathWorks, Inc 2
- 3 Apple Hill Drive 2
- Natick, MA 01760-2098 2
- Revision History 3
- Contents 5
- ConnectingtoHardware 7
- WorkingwithAcquiredImageData 9
- Troubleshooting 11
- Functions — By Category 12
- ........................ A-3 14
- Getting Started 15
- 1 Getting Started 16
- Related Products 17
- Supported Hardware 17
- V iewing Object Properties 27
- Setting Object Properties 29
- Running the Example 31
- Toolbox Compone 37
- 2 Introduction 38
- Setting Up Frame Grabbers 39
- Previewing Data 42
- Each time 51
- Using the Image Acquisition 53
- Tool GUI 53
- Opening the Tool 54
- Parts of the Desktop 54
- Selecting Your Device 57
- Adding New Hardware 58
- Using a Camera File 59
- Setting Frames Per Trigger 61
- Setting the Color Space 62
- Using the Region of Interest 62
- Logging Your Data 65
- Memory Logging 66
- Disk Logging 66
- Setting Up Triggering 67
- Selecting the Trigger Type 68
- The Preview Window 71
- Acquiring Data 73
- 4 and Number of 74
- Immediate,thetool 75
- 1 or any 75
- If Images Are Blurry or Dark 76
- Previewing and Acquiring Data 77
- Expor ting Data 78
- Exporting Data 79
- 3 Click Save 80
- 4 Click Save 83
- Connecting to Hardware 85
- Getting Hardware Information 87
- Getting Hardware Inform ation 89
- TypesofObjects 93
- 1 Thetitleofthesum 95
- Using a Video Format String 97
- 4 Connecting to Hardware 100
- Setting Trigger Properties 107
- Acquiring Image Data 115
- 5 Acqu iring Image Data 116
- Data Logging 117
- Specifying the Trigger Type 123
- Example: Using a 125
- Manual T 127
- TriggerRep eat property 133
- Example: 137
- Acquiring 100 Frames 137
- Determining How 139
- Many Frames Are Available 139
- Specifying Multiple Triggers 143
- Using the wait Function 145
- Managing Memory Usage 149
- Freeing Memory 151
- Logging Image Data to Disk 154
- Logging Data to a Disk File 155
- Example: Logging Data to Disk 157
- Working with Acquired 161
- Image Data 161
- Over view 162
- Overview 163
- FramesPerTrigger property: 165
- FramesPerTrigger property 165
- FramesPerTrigger property to 165
- Frames Returned by peekdata 167
- FramesAvailable property 171
- Understanding Image Data 172
- ROIs and Image Dimensions 173
- Specifying the Color Space 177
- Viewing Acquired Data 179
- Retrieving Timing Information 180
- Using Events and Callbacks 185
- 7 Using Events and Callbacks 186
- Event Types 188
- Retrieving Event Information 191
- Data Fields for Timer Events 193
- 3 Acquir 201
- Using the From Video 205
- DeviceBlockinSimulink 205
- Opening the Block Librar y 207
- Introduction 209
- Step 2: Open a Mod 210
- Step 3: Drag the F 211
- Step 4: Drag Othe 212
- Step 5: Connect t 214
- Step 7: Run the Si 216
- Adding Support for 217
- Additional Hardware 217
- For More Information 219
- 10 Troubleshooting 222
- IFC Devices 225
- Sapera Devices 227
- Installing the Driver 231
- 6 Select Camer 233
- To exit 235
- 2 If your hardw 237
- 2 Select Start 239
- Diagnostic Tool 245
- Function 247
- Objects G eneral Purpose 250
- Triggering 251
- 11 Functions — By C atego ry 252
- Functions — Alphabetical 255
- Syntax clear obj 256
- Syntax closepreview(obj) 257
- Syntax delete(obj) 258
- Syntax obj 259
- See Also videoinput 260
- Syntax flushdata(obj) 261
- Syntax get(obj) 262
- See Also set, videoinput 262
- Syntax data = getdata(obj) 263
- , imaqhelp, peekdata 269
- Syntax imaqfind 270
- See Also get, videoinput 271
- Syntax imaqhelp 272
- See Also propinfo 273
- Syntax out = imaqhwinfo 274
- See Also imaqhelp, im aqreset 277
- Syntax mem = imaqmem 278
- , getdata, vide oinp ut 280
- Syntax imaqmontage(frames) 281
- Create an axes object 282
- Syntax imaqreset 283
- See Also delete, vid eoinput 283
- Syntax imaqtool 284
- Syntax bool = islogging(obj ) 285
- Properties 286
- Syntax bool = isrunning(obj ) 287
- Syntax bool = isvalid(obj) 289
- Syntax load filename 290
- Syntax preview(obj) 297
- Syntax out = propinfo(obj) 301
- See Also imaqhelp 302
- Syntax save filename 303
- Syntax set(obj) 304
- Syntax start(obj) 306
- Syntax stop(obj) 308
- Syntax stoppreview(obj) 309
- Purpose Initiate data logging 310
- Syntax trigger(obj) 310
- Examples Example 1 312
- Syntax triggerinfo(obj) 314
- , trigg erconfig 315
- , imaqfind, isvalid, preview 318
- Syntax wait(obj) 319
- Properties — By Category 321
- Video Input Objects 322
- Callback 323
- 13 Properties — By Category 324
- Acquisition Source 325
- Video Source Objects 326
- Properties — Alphabetical 327
- BayerSensorAlignment 328
- DeviceID 330
- DiskLogger 332
- DiskLoggerFrameCount 334
- ErrorFcn 335
- EventLog 336
- FrameGrabInter val 338
- FrameGrabInterval 339
- FramesAcquired 340
- FramesAcquiredFcn 341
- FramesAcquiredFcnCount 342
- FramesAvailable 343
- FramesPerTrigger 344
- InitialTriggerTime 345
- See Also Functions 347
- LoggingMode 348
- Characteristics 350
- NumberOfBands 351
- Previewing 354
- ReturnedColorSpace 355
- ROIPosition 356
- See Also Properties 358
- Selected 359
- SelectedSourceName 361
- SourceName 364
- Star tFcn 365
- TimerFcn 369
- TimerPeriod 370
- TriggerCondition 371
- TriggerFcn 373
- TriggerFrameDelay 374
- TriggerRepeat 376
- TriggersExecuted 377
- TriggerSource 378
- TriggerType 379
- UserData 382
- V ideoFormat 383
- VideoFormat 384
- VideoResolution 385
- Blocks — Alphabetical List 387
- From Video Device 388
- From Video D evice 389
- Video Input (Obsolete) 395
- Examples 397
- Fundamentals 398
- Image Acquisition Tool (GUI) 398
- Working with Acquired Data 399
- Events and Callbacks 399
- A Examples 400
- VideoFormat property 14-57 408
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