USB 3.0 Multiple Camera Setup - PennWell`s Listing Management
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1. Mono8 1328x1048 55 fps 9744 78 Total 234 MB s Using the configuration above a total of 234 MB s is transferred to the host from multiple cameras Although the effective USB 3 0 bandwidth is approximately 450 MByte s peak performance using a hub has been tested to be significantly lower Example C Four cameras connected to a hub Camera Pixel Format Resolution prame packer size Bandwiet Rate Byte MByte s FL3 U3 13S3M CS_ Monog 1328x1048 40 fps 7308 58 FL3 U3 13S3M CS_ Monog 1328x1048 40 fps 7308 58 FL3 U3 13S3M CS_ Monog 1328x1048 40 fps 7308 58 FL3 U3 13S3M CS_ Monog 1328x1048 40 fps 7308 58 Total 232 MB s Using the configuration above a total of 232 MB s is transferred to the host from multiple cameras Although the effective USB 3 0 bandwidth is approximately 450 MByte s peak performance using a hub has been tested to be significantly lower Revised 21 Jun 12 Copyright 2012 Point Grey Research Inc All rights reserved Point Grey Research TAN2012005 USB 3 0 Multiple Camera Setup 1 9 Troubleshooting Enumeration When using a USB 3 0 camera ensure it is adequately powered by an external adapter Ensure the latest Point Grey firmware and drivers are being used Link Recovery Errors The host controller enters a recovery state to recover from bit errors that it has detected This is often caused by a long cable or a bad connec2. in Device Manager Product Downloads Customers with a Customer Login Account can access the latest software and firmware for their cameras from our Downloads page We encourage our customers to keep their software and firmware up to date by downloading and installing the latest versions Contacting Technical Support Before contacting Technical Support have you 1 Read the product documentation and user manual 2 Searched the Knowledge Base 3 Downloaded and installed the latest version of software and or firmware If you have done all the above and still can t find an answer to your question contact our Technical Support team Revised 21 Jun 12 Copyright 2012 Point Grey Research Inc All rights reserved 10
3. 000 SSSS I fey by ia Data Flash A Image Size 3228 KB B Image Horizontal Vertical idth System Infi ti Estimated Bandwidth 194 MB s eee a ec Format 7 Packet Size Height 1552 Pixel format Mono amp Bits per pixel 8 Embedded image information Diagnostics Bus Topolo m niid 404 U usu Packet Size 24644 Packet Delay Help Support Min Packet Delay ME F OK Frame Rate Proc Disp Req 60 03 fps Figure 4 Using FlyCap2 to determine bandwidth allocation 1 8 Multiple camera system configurations This section will document various configurations and scenarios that have been tested with Point Grey USB 3 0 multiple cameras The hardware and software setup with each configuration will also be documented 1 8 1 Multiple cameras connected directly to a USB 3 0 host controller This setup will provide a baseline bandwidth comparison with the other configurations This configuration will show the maximum bandwidth that the host controller will support Figure 5 Multiple cameras connected directly to the host controller Revised 21 Jun 12 Copyright 2012 Point Grey Research Inc All rights reserved 5 Point Grey Research TAN2012005 USB 3 0 Multiple Camera Setup System Description Component Description CPU Intel Core i 7 2600k Motherboard Asus P8Z68Pro RAM 4GB Host adapter Point Grey USB 3 0 PCI Express Card Fresco FL10
4. 09 Chipset Cabling Point Grey 3 meter USB 3 0 Cable Type A to Micro B Operating system Windows 7 x86 Driver PGRXHCI Driver 2 3 3 22 Software FlyCapture2 Release 2 3 2 14 x86 Camera firmware 1 21 3 0 Note For recommended USB 3 0 system components please refer to Knowledge Base Article 368 Frame Packet Size Bandwidth Camera Model Pixel Format Resolution Rate Byte MByte s FL3 U3 13S3M CS Mono12 1328 x 1048 86 fps 23056 184 FL3 U3 13S3M CS Mono12 1328 x 1048 86 fps 23056 184 Total bandwidth 368 MB s Using the configuration above a total of 368 MB s is transferred to the host from multiple cameras Although the effective USB 3 0 bandwidth is approximately 450MByte s peak performance can vary Revised 21 Jun 12 Copyright 2012 Point Grey Research Inc All rights reserved 6 Point Grey Research TAN2012005 USB 3 0 Multiple Camera Setup 1 8 2 Multiple cameras connected via hub This configuration will demonstrate free running 2 3 and 4 cameras using a single USB 3 0 hub A table will be provided to demonstrate the frame rates achieved in each configuration As shown from the results the USB 3 0 hub used could not sustain a data rate of greater than 234 MByte s 5 M System Description e e Figure 6 Multiple cameras connected to the host via hub Component Description CPU Intel Core i 7 2600k Motherboard Asus P8Z68Pro RAM 4GB Host adap
5. 3 Bytes per pixel for specific pixel format FlyCap2 can be used to determine the bandwidth allocated for a given packet size The packet size should be reduced or increased to ensure the total amount of bandwidth output by the camera s does not exceed system limits Revised 21 Jun 12 Copyright 2012 Point Grey Research Inc All rights reserved 4 Point Grey Research TAN2012005 USB 3 0 Multiple Camera Setup FlyCap2 2 3 18 Point Grey Research Flea3 FL3 Y FlyCapture2 23 18 Point Grey Research Flea3 FL3 U3 32S2M 11331565 uc t Camera Settings Custom Video Modes Standard Video Modes area Image Information oe Maximum image size 2080x1552 Pixel Format Image size units 16 H 2 V Camera Information Pixel Format Image offset units 4 H 2 V Camera Registers Pre color processing subsampling N A HOONE Camera Information Image Trigger Strobe r g a ee Left me Width 2080 Post color processing subsampling Advanced Camera Settings N A High Dynamic Range Start 0 0 End 2080 1552 Top M Heir METE srndord binning Unknown Dimensions 2080 x 1552 Center ROI Look Up Table Cursor N A mage Bayer binning Unknown Cols N A Rows N A Seconds Tue Jun 05 15 16 42 2012 Microseconds 197554 Camera timestamp seconds 0 Camera timestamp count 0000 Frame Buffer Binning GigE Only Gandwidth Information Camera timestamp offset 0
6. POINT GREY Technical Application Note Innovation in Imaging USB 3 0 Multiple Camera Setup Technical Application Note TAN2012005 Revised June 21 2012 1 1 Subject Technical Application Note TAN2012005 USB 3 0 Multiple Camera Setup 1 2 Applicable Product s Point Grey USB 3 0 imaging devices 1 3 Application Note Description This application note will explore multiple USB 3 0 camera configurations The purpose of this document is to provide a reference and a starting point for USB 3 0 camera users who wish to use multiple USB 3 0 cameras in their application Preparing for Use Point Grey USB 3 0 Technology Configure Drivers Bandwidth Allocation Multiple Camera System Configurations General Troubleshooting Additional Downloads and Support 1 4 Preparing for Use Before you use your Point Grey USB 3 0 camera we recommend that you are aware of the following resources Getting Started Manual for the camera provides information on installing components and software needed to run the camera The Getting Started manuals can be downloaded from the Point Grey Website Technical Reference for the camera provides information on the camera s specifications features and operations as well as imaging and acquisition controls The technical references can be downloaded from the Point Grey Downloads page FlyCapture2 SDK contains utilities to configure the camera such as Driver Control GUI update firmware and driv
7. amera preventing skipped frames or connectivity issues 1 7 1 Format 7 Packet Size Format 7 packet size provides the user with a mechanism to allocate bandwidth for a particular camera Reducing the packet size will lower the camera s maximum frame rate and hence limit the amount of bandwidth the camera can use up The packet size can be controlled in FlyCapture2 or via the IIDC registers Revised 21 Jun 12 Copyright 2012 Point Grey Research Inc All rights reserved 3 Point Grey Research TAN2012005 USB 3 0 Multiple Camera Setup In Figure 2 below reducing the packet size to 22624 bytes will limit the maximum frame rate to 55 FPS assuming image size and pixel format stay the same T FlyCap2 2 3 1 8 Point Grey Research Flea3 FL3 I J FlyCapture2 2 3 1 8 Point Grey Research Flea3 FL3 U3 3252M 11331565 7 cmm File View Settings Help Camera Settings Custom Video Modes gt gt gt gt gt A Mode Image Information O OA GO aD standardvideomodes OV W Ow Gwe Mod o Maximum image size 2080x1552 Camera Information Custom video Modes Pixel Format Image size units 16 H 2 V Frame rate Camera Information Pixel Format Mono 8 Z Image offset units 4 H 2 V e eE Camera Registers Pre color processing subsampling Displayed 54 98 fps ea Image NA Trigger Strobe a a Requested 55 00 fps Let 0 H wiath D080 Post color processing subsampling B Timestamp Advanced Camera Setting
8. e of transfer guarantees delivery and retransmits corrupt data packets hence recovering from data errors when they occur Data Buffer Point Grey USB 3 0 cameras have a data buffer that allows images to be temporarily queued in the camera after readout The main advantage of the data buffer is that it allows the system to handle momentary slowdowns on the bus without dropping any data If the overall data throughput drops below requested data rate for an extended period of time the camera can send entire un corrupted frames out slower and drop entire frames cleanly rather than drop partial frames and cause image data errors USB 3 0 link layer IP Point Grey has implemented its own USB 3 0 link layer technology in the camera FPGA This allows Point Grey to introduce new functionality and ensure compatibility with third party hardware Revised 21 Jun 12 Copyright 2012 Point Grey Research Inc All rights reserved 2 Point Grey Research TAN2012005 USB 3 0 Multiple Camera Setup 1 6 Configure Drivers Point Grey sells two USB 3 0 host controller cards based on the FL1009 chipset from Fresco and the PD720200 chipset from Renesas In addition to each of the manufacturer drivers Point Grey has also created its own Extensible Host Controller Interface xHCI driver that is compatible with several USB 3 0 host controller chipsets The PGRxHCI driver offers the best compatibility between the camera and host controller Point Grey recomme
9. ers and check setup As well contains the FlyCapture2 API for use in creating your own applications FlyCapture2 can be downloaded from the Point Grey Downloads page PGR the Point Grey Research Inc logo FlyCapture Digiclops Dragonfly Dragonfly Express Chameleon Firefly Flea Ladybug Zebra Scorpion and Triclops are trademarks or registered trademarks of Point Grey Research Inc in Canada and other countries Copyright 2012 Point Grey Research Inc All rights reserved Point Grey Research TAN2012005 USB 3 0 Multiple Camera Setup Firmware updates ensure you are using to most up to date firmware for the camera to take advantage of improvements and fixes The latest firmware can be downloaded from the Point Grey Downloads page 1 5 Point Grey USB 3 0 Technology The type of data transfer that Point Grey USB 3 0 cameras use is bulk transfer When factoring in the related overhead the effective bandwidth is approximately 450 MByte s Point Grey s USB 3 0 implementation uses image buffering to improve multiple camera system reliability and ensure data integrity Point Grey xHCI Driver Point Grey has developed its own Extensible Host Controller Interface driver for third party USB 3 0 host controller chipsets This provides Point Grey with diagnostic tools to improve performance and reliability of USB 3 0 cameras Packet Retransmission Point Grey USB 3 0 cameras use a type of data transfer called bulk transfer This typ
10. nds using this driver when using Point Grey USB 3 0 cameras For a list of compatible chipsets please refer to Knowledge Base Article 368 Using Point Grey s driver control utility users are able to identify the driver they are using and easily switch between them Please refer to screenshot presented in Figure 1 The Point Grey Driver should be selected from the driver selection window Point Grey s PGRxHCI driver does not support USB devices from other manufacturers For more information please refer to Knowledge Base Article 370 Y DriverControlGUI s E FreWire USB GigE _ Other Configuration 5 PC Driver Info Renesas Electronics USB 3 0 Host Controller a W Fresco Logic xHCI USB3 Controller FL1009 Series eiaa Intel R 6 Series C200 Series Chipset Family USB Enhanced Host Controler 1C26 Date Intel R 6 Series C200 Series Chipset Family USB Enhanced Host Controller 1C2D 3 Version Driver Selection Point Grey Drivers Third Party Drivers Microsoft Drivers Manual Selection n Install Driver PCle Bus Info PCle Bus Speed Select a USB card using the USBPRO Driver Figure 1 Point Grey s DriverControlGUI 1 7 Bandwidth Allocation USB 3 0 does not automatically manage bandwidth allocation To help users accommodate multiple cameras on a single bus Point Grey uses a camera attribute which limits peak data bandwidth This can be used to reduce the amount of data coming from each c
11. s N A a Top O Height 1552 Seconds Tue Jun 05 15 21 29 2012 High Dynamic Range Start 0 0 End 2080 1552 Standard binning Unknown Dimensions 2080 x 1552 Ji saree 10554 os ae passes rs Center ROI Maximage Size Bayer binning Unknown amera timestamp seconds Cae tenia Camera timestamp count 0000 Frame Buffer Binning GigE Only Bandwidth Information Camera timestamp offset 0000 5 Image Width 2080 Height 1552 Pixel format Mono 8 Data Flash r Image Size 3228 KB System Information Estimated Bandwidth 181 MB s _ Format 7 Packet Size BusTopology M 404 J 2064 Help Support O Packet Size 22624 Packet Delay Bits per pixel 8 fs Embedded image information Diagnostics Min Max Packet Delay M OOK Frame Rate Proc Disp Req 55 02 fps Figure 2 Point Grey s FlyCap2 Custom Video Modes tab 1 7 2 Calculating Required Bandwidth To calculate your bandwidth requirements use your required resolution frame rate and pixel format bytes per pixel in the following equation Height x Width x Frame Rate x Bytes per Pixel Bandwidth in MB For example Camera model FL3 U3 13S2M CS Resolution 1328 x 1048 Frame rate 60 FPS Pixel format Mono16 Bandwidth 1328 x 1048 x 60 x 2 167 MB Pixel format Mono8 Mono12 Mono16 RGB8 YUV411 YUV422 YUV444 Raw8 Raw12 Raw16 Bytes per pixel 1 1 5 2 3 1 5 2 3 Figure
12. s used the effective bandwidth and hence frame rate will be reduced by half For more information please refer to Knowledge Base Article 386 Ensure images frames are not being skipped Please refer to the Skipped Image Frames section for more information For more information please refer to Knowledge Base Article 371 Revised 21 Jun 12 Copyright 2012 Point Grey Research Inc All rights reserved 9 Point Grey Research TAN2012005 USB 3 0 Multiple Camera Setup 1 10 Additional Downloads and Support Point Grey Research Inc endeavors to provide the highest level of technical support possible to our customers Most support resources can be accessed through the Support section of our website Creating a Customer Login Account The first step in accessing our technical support resources is to obtain a Customer Login Account This requires a valid name and email address To apply for a Customer Login Account go to the Downloads page Knowledge Base Our Knowledge Base contains answers to some of the most common support questions It is constantly updated expanded and refined to ensure that our customers have access to the latest information USB 3 0 Frequently Asked Questions Recommended and unsupported USB 3 0 system components Troubleshooting known USB 3 0 configuration issues Will my computer support my USB 3 0 camera What cards and drivers will work with my USB 3 0 camera How does my USB 3 0 camera appear
13. ter Point Grey USB 3 0 PCI Express Card Fresco FL1009 Chipset Hub StarTech Mountable 4 Port Rugged Industrial SuperSpeed USB 3 0 Hub VIA VL810 Chipset firmware version 8 8 Cabling Point Grey 3 meter USB 3 0 Cable Type A to Micro B Operating system Windows 7 x86 Driver PGRxHCI Driver 2 3 3 22 Software FlyCapture2 Release 2 3 2 14 x86 Camera firmware 1 21 3 0 Note For recommended USB 3 0 system components please refer to Knowledge Base Article 368 Revised 21 Jun 12 Copyright 2012 Point Grey Research Inc All rights reserved 7 Point Grey Research TAN2012005 USB 3 0 Multiple Camera Setup Example A Two cameras connected to a hub Camera model Pixel Format Resolution Frame Packet SIZE BINAWI Rate Byte MByte s FL3 U3 13S3M CS Mono8 1328 x 1048 80 fps 14268 114 FL3 U3 13S3M CS Mono8 1328 x 1048 80 fps 14268 114 Total bandwidth 228 MB s Using the configuration above a total of 228 MB s is transferred to the host from multiple cameras Although the effective USB 3 0 bandwidth is approximately 450 MByte s peak performance using a hub has been tested to be significantly lower Example B Three cameras connected to a hub Camera Pixel Format Resolution frame RacKeholze i bandwiatn Rate Byte MByte s FL3 U3 13S3M CS_ Mono8 1328x1048 55 fps 9744 78 FL3 U3 13S3M CS_ Mono8 1328x1048 55 fps 9744 78 FL3 U3 13S3M CS_
14. tion Use the same cables to ensure the performance of each camera is consistent Shorter cables are also preferred for better reliability For more information please refer to Knowledge Base Article 372 Skipped Image Frames This happens when the host is too slow in receiving and acknowledging the data coming from the camera This can be caused by a host system that is too busy or by having too much data on the USB 3 0 bus for the host to handle The number of skipped frames will be shown in the Camera Information panel in Flycapture2 To alleviate the issue manually reduce the Format 7 packet size until the max frame rate is reduced and images are no longer being skipped Frame rate Processed 60 07 fps Displayed 57 21 fps Requested 120 00 fps Timestamp Seconds Thu May 31 16 36 32 2012 Microseconds 949280 Camera timestamp seconds 0 Camera timestamp count 0000 Camera timestamp offset 0000 Image Width 1328 Height 1048 Pixel format Mono 8 Bits per pixel 8 Embedded image information 3 Diagnostics Skipped frames 249 Link recovery count camera 6 Link recovery count host 0 Transmit failures 0 Figure 7 FlyCapture2 Camera Information Panel Using a higher performance PC will also ensure less frames are skipped Low Frame Rate Increase the Format 7 packet size Ensure the PCI Express bus is 2 0 compliant If a PCI Express 1 0 bus i
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