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18 Properties — Alphabetical List
18-16
FrameGrabInterval
Specify how often to acquire frame from video stream
Description
The FrameGrabInterval property specifies how often the video input object acquires a
frame from the video stream. By default, objects acquire every frame in the video stream,
but you can use this property to specify other acquisition intervals.
Note Do not confuse the frame grab interval with the frame rate. The frame rate
describes the rate at which an image acquisition device provides frames, typically
measured in seconds, such as 30 frames per second. The frame grab interval is measured
in frames, not seconds. If a particular device's frame rate is configurable, the video source
object might include the frame rate as a device-specific property.
For example, when you specify a FrameGrabInterval value of 3, the object acquires
every third frame from the video stream, as illustrated in this figure. The object acquires
the first frame in the video stream before applying the FrameGrabInterval.
You specify the source of the video stream in the SelectedSourceName property.
- Image Acquisition Toolbox™ 1
- User's Guide 1
- How to Contact MathWorks 2
- Revision History 3
- Contents 5
- Using Events and Callbacks 10
- Using the Matrox Interface 13
- Troubleshooting 14
- Functions — Alphabetical List 16
- Block Reference 16
- Getting Started 17
- 1 Getting Started 18
- Product Overview 19
- Related Products 21
- Supported Hardware 21
- Image Acquisition Tool (GUI) 22
- Step 6: Acquire Image Data 33
- Step 7: Clean Up 37
- Introduction 39
- Toolbox Components Overview 40
- Toolbox Components 41
- 2 Introduction 42
- Supported Devices 43
- Setting Up Frame Grabbers 45
- Previewing Data 48
- Previewing Data 49
- Opening the Tool 60
- Parts of the Desktop 60
- Selecting a Device and Format 66
- Adding New Hardware 68
- Using a Camera File 68
- Setting Frames Per Trigger 70
- Setting the Color Space 71
- Logging Your Data 74
- Setting Up Triggering 77
- Setting a Region of Interest 80
- Restoring Default Parameters 85
- The Preview Window 86
- Acquiring Data 88
- About the Session Log 101
- Saving the Session Log 101
- Copying the Session Log 102
- Adaptors 111
- Connecting to Hardware 119
- Getting Hardware Information 120
- Determining the Device ID 121
- 5 Connecting to Hardware 122
- Getting Hardware Information 123
- Creating a Video Input Object 127
- Specifying the Video Format 129
- Using the save Command 145
- Using the obj2mfile Command 145
- Acquiring Image Data 149
- Data Logging 151
- 6 Acquiring Image Data 152
- Data Logging 153
- Specifying the Trigger Type 156
- Using an Immediate Trigger 157
- Using a Manual Trigger 159
- Specifying the Trigger Type 167
- Executing Multiple Triggers 181
- Managing Memory Usage 186
- Logging Image Data to Disk 190
- Logging Image Data to Disk 193
- Image Acquisition Overview 200
- Overview 201
- Understanding Image Data 209
- Specifying the Color Space 214
- Viewing Acquired Data 220
- Retrieving Timing Information 221
- 02-Mar-2007 13:00:24 222
- [data time] = getdata(vid); 222
- 8 Using Events and Callbacks 230
- Event Types 231
- Event Types 233
- Retrieving Event Information 234
- Retrieving Event Information 235
- Monitoring Memory Usage 243
- Simulink 247
- Using the imaqlib Command 249
- Using Code Generation 251
- Saving Video Data to a File 252
- Saving Video Data to a File 253
- Step 5: Connect the Blocks 255
- Step 7: Run the Simulation 257
- Types of Setups 260
- Windows Configuration 262
- Linux Configuration 263
- Mac Configuration 264
- The TCP/IP tab 266
- The DNS tab 267
- The Ethernet tab 268
- Software Configuration 269
- Setting Preferences 271
- Property Display 278
- Set GigE Properties 280
- Use GigE Commands 281
- Create the gigecam Object 283
- Using the Kinect for Windows 289
- Detecting the Kinect Devices 295
- Saturation = 1 298
- Sharpness = 0.5 298
- WhiteBalance = 2700 298
- Runtime from the list 316
- 13 Using the Matrox Interface 322
- L = isLocked(obj) 333
- Kinect for Windows Metadata 335
- <property_value> 338
- Using the codegen Function 342
- Shared Library Dependencies 342
- Adding Support for Additional 345
- Hardware 345
- Troubleshooting Overview 348
- DALSA Coreco IFC Hardware 349
- 16 Troubleshooting 350
- DALSA Coreco Sapera Hardware 351
- Data Translation Hardware 353
- Hamamatsu Hardware 361
- Matrox Hardware 362
- Matrox Hardware 363
- QImaging Hardware 364
- QImaging Hardware 365
- National Instruments Hardware 366
- Point Grey Hardware 368
- Point Grey Hardware 369
- Kinect for Windows Hardware 370
- Kinect for Windows Hardware 371
- GigE Vision Hardware 372
- GigE Vision Hardware 373
- [d t m]=getdata(vid,2); 377
- GenICam GenTL Hardware 380
- GenICam GenTL Hardware 381
- Windows Video Hardware 382
- Windows Video Hardware 383
- Linux Video Hardware 385
- Linux DCAM IEEE 1394 Hardware 387
- Macintosh Video Hardware 388
- Description 394
- Examples 396
- commands 397
- See Also 398
- executeCommand 403
- Input Arguments 404
- More About 420
- Properties 438
- imaq.VideoDevice 439
- Functions 440
- obj2mfile 455
- Custom Update Function 461
- BayerSensorAlignment 492
- Characteristics 493
- DeviceID 494
- DiskLogger 496
- DiskLoggerFrameCount 501
- ErrorFcn 502
- EventLog 503
- FrameGrabInterval 506
- FramesAcquired 508
- FramesAcquiredFcn 509
- FramesAcquiredFcnCount 510
- FramesAvailable 511
- FramesPerTrigger 512
- InitialTriggerTime 513
- LoggingMode 516
- NumberOfBands 520
- Previewing 523
- ReturnedColorSpace 524
- ROIPosition 526
- Selected 530
- SelectedSourceName 532
- SourceName 536
- StartFcn 537
- TimerFcn 541
- TimerPeriod 542
- TriggerCondition 543
- TriggerFcn 545
- TriggerFrameDelay 546
- TriggerRepeat 548
- TriggersExecuted 550
- TriggerSource 551
- TriggerType 553
- UserData 557
- VideoFormat 558
- VideoResolution 560
- From Video Device 562
- Code Generation 563
- Dialog Box 564
- From Video Device 565
- 19 Block Reference 566
- Video Input (Obsolete) 573
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