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6 Working with Acquired Image Data
MathWorks product, Image Processing Toolbox, includes functions that
convert Y CbCr data to RGB data, and v ice versa.
Note Some devices that claim to support the YUV color space actually
support the YCbCr color space. YUV is similar to YCbCr but not identical.
ThedifferencebetweenYUVandYCbCr is th e scaling factor applied to the
result. YUV refers to a particular scaling factor used in composite NTSC
and PAL formats. In most cases, you can specify the YCbCr color space for
devices that support YUV.
Thefollowingexampleillustrateshowtospecifythecolorspaceofthe
returned image data.
1 Create an im age acquisition object — Th i s example creates a video
input object for a generic Windows image acquisition d evice. To run this
example on your system, use the
imaqhwinfo function to get the object
constructor for your image acquisition device and substitute that syntax
for the following code.
vid = videoinput('win video',1);
2 View the default color space used for the data — The value of the
ReturnedColorSpace prope rty indicates the color space of the im a ge data.
vid.ReturnedColorSpace
ans =
rgb
3 Modify the c olor space used for the data — To change the color space
of the returned image data, set the value of the
ReturnedColorSpace
property.
set(vid,'ReturnedColorSpace','gra yscale')
ans =
grayscale
6-18
- 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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