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Video formats, modes and bandwidth
STINGRAY Technical Manual V2.2.0
203
Frame rates
An IEEE 1394 camera requires bandwidth to transport images.
The IEEE 1394b bus has very large bandwidth of at least 62.5 MByte/s for
transferring (isochronously) image data. Per cycle up to 8192 bytes (or
around 2000 quadlets = 4 bytes@ 800 Mbit/s) can thus be transmitted.
Depending on the video format settings and the configured frame rate, the
camera requires a certain percentage of maximum available bandwidth.
Clearly the bigger the image and the higher the frame rate, the more data is
to be transmitted.
The following tables indicate the volume of data in various formats and
modes to be sent within one cycle (125 µs) at 800 Mbit/s of bandwidth.
The tables are divided into three formats:
They enable you to calculate the required bandwidth and to ascertain the
number of cameras that can be operated independently on a bus and in which
mode.
Note
L
Configuration
To configure this feature in an advanced register see Chapter
Autofunction AOI on page 275.
Note
L
All bandwidth data is calculated with:
1 MByte = 1024 kByte
Format Resolution Max. video format
Format_0 up to VGA 640 x 480
Format_1 up to XGA 1024 x 768
Format_2 up to UXGA 1600 x 1200
Table 82: Overview fixed formats
- Technical Manual 1
- AVT Stingray 1
- Legal notice 2
- Contents 3
- Introduction 11
- Manual overview 14
- More information 17
- Before operation 17
- STINGRAY cameras 19
- Declarations of conformity 20
- FireWire 21
- FireWire in detail 22
- 1394b port 26
- 1394a camera 26
- 1394a port 26
- 1394b camera 26
- 1394b bandwidths 29
- Operating system support 35
- Filter and lenses 36
- Camera lenses 37
- Specifications 39
- STINGRAY F-046B/C (fiber) 41
- STINGRAY F-080B/C (fiber) 43
- STINGRAY F-145B/C (fiber) 45
- STINGRAY F-146B/C (fiber) 47
- STINGRAY F-201B/C (fiber) 49
- Spectral sensitivity 51
- Camera dimensions 57
- Tripod adapter 59
- Cross section: CS-Mount 68
- Cross section: C-Mount 69
- Stingray board level: C-Mount 73
- Camera interfaces 74
- Status LEDs 78
- Normal conditions 79
- Error conditions 79
- Stingray board level models) 90
- Pixel data 93
- Color cameras 97
- White balance 98
- Automatic white balance 101
- Auto shutter 102
- Auto gain 104
- Manual gain 107
- Horizontal mirror function 109
- Shading correction 110
- How to store shading image 111
- Output = f (Input) 117
- Vertical binning 121
- What is sub-sampling? 126
- Description of sub-sampling 126
- Description of the data path 130
- Why new timing modes? 134
- ☺ Disadvantage 136
- Packed 12-Bit Mode 139
- Deferred image transport 141
- HoldImg mode 142
- FastCapture mode 144
- Sharpness 147
- Hue and saturation 148
- Color correction 149
- Color conversion (RGB YUV) 151
- Bulk Trigger 151
- Level Trigger 151
- Serial interface 152
- Name Field Bit Description 153
- Controlling image capture 157
- Trigger delay 162
- Exposure time offset 164
- Minimum exposure time 165
- Extended shutter 165
- One-shot 167
- Exposure 169
- Multi-shot 170
- ISO_Enable / free-run 170
- Asynchronous broadcast 170
- Jitter at start of exposure 171
- Sequence mode 173
- SetupMode to 177
- Disable SetupMode 177
- SIS: Definition 182
- SIS: Scenarios 182
- Area of interest (AOI) 201
- Autofunction AOI 203
- Frame rates 204
- Frame rates Format_7 208
- Test images 217
- Test images for color cameras 218
- Configuration of the camera 219
- ADV_FNC_INQ 222
- Sample program 223
- Example FireStack API 224
- Configuration ROM 225
- 424h + 000004 x 4 = 434h 226
- 440h + 0000xx * 4 = 444h 226
- = value of directory entry 226
- 0-7 8-15 16-23 24-31 226
- Camera initialize register 228
- PIO_Control_Quadlet_Offset 241
- SIO_Control_Quadlet_Offset 241
- Strobe_Output_Quadlet_Offset 241
- Name Description 245
- Format_7 250
- Temperature register 252
- Advanced registers summary 253
- Advanced feature inquiry 258
- Camera status 260
- Maximum resolution 261
- Time base 261
- Look-up tables (LUT) 265
- [8..31] In bytes 268
- Frame information 272
- Input/output pin control 272
- Auto shutter control 274
- Auto gain control 275
- Mirror image 278
- Soft reset 279
- Maximum ISO packet size 281
- Parameter-List Update 285
- Format_7 mode mapping 286
- Secure image signature (SIS) 288
- Cycles Seconds 289
- Cycle count 290
- User profiles 293
- GPDATA_BUFFER 297
- Firmware update 298
- Appendix 299
- , 102, 104, 105, 107, 251 300
- , 115, 118 304
- , 184, 218 304
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