Halcon视觉之家 - 51Halcon专注于机器视觉技术

 找回密码
 会员注册

QQ登录

只需一步,快速开始

扫一扫,微信登录

查看: 1467|回复: 3

[官方资源] Considerations when using Multiple FireWire Cameras?

[复制链接]
  • TA的每日心情

    2019-12-2 10:35
  • 签到天数: 51 天

    连续签到: 1 天

    [LV.5]常住居民I

    146

    主题

    483

    帖子

    1765

    积分

    Rank: 7Rank: 7Rank: 7

    积分
    1765

    优秀版主

    发表于 2018-8-14 11:23:13 | 显示全部楼层 |阅读模式

    51Halcon诚邀您的加入,专注于机器视觉开发与应用技术,我们一直都在努力!

    您需要 登录 才可以下载或查看,没有帐号?会员注册

    x
    本帖最后由 wenluderen 于 2018-8-14 11:25 编辑

    Considerations when using Multiple FireWire Cameras?

    Considerations when using Multiple FireWire Cameras?
    Product:        VisionPro
    Platform:        All Platforms
    Full Description

    What are the important considerations when using multiple FireWire cameras?

    Solution

    When designing a vision application that will use multiple cameras, the following system configuration options should be considered.

    FireWire Adapter

    Speed: An IEEE 1394a adapter supports a FireWire bus with 400 Mb/sec of bandwidth while an IEEE 1394b adapter supports a FireWire bus with 800 Mb/sec of bandwidth when used with 1394b-based cameras running in 1394b mode.
    ×××速度和千兆以太网 没啥区别了,就一点点而已
  • TA的每日心情

    2019-12-2 10:35
  • 签到天数: 51 天

    连续签到: 1 天

    [LV.5]常住居民I

    146

    主题

    483

    帖子

    1765

    积分

    Rank: 7Rank: 7Rank: 7

    积分
    1765

    优秀版主

     楼主| 发表于 2018-8-14 11:23:25 | 显示全部楼层
    本帖最后由 wenluderen 于 2018-8-14 11:41 编辑

    Note: The 1394b speed is not yet supported by VisionPro.
    DMA Channels: All OHCI-based FireWire adapters, the type supported by VisionPro, provide a minimum of 4 DMA channels. With 4 DMA channels, images can be acquired from up to 4 FireWire cameras at the same time. Select an adapter that has at least as many DMA channels as cameras being used for simultaneous acquisition.

    PCI interface: Most IEEE 1394a adapters and some IEEE 1394b adapters support the 33-MHz/32-bit PCI interface; some IEEE 1394b adapters are available with the 33-MHz/64-bit PCI interface.
    A 33-MHz/32-bit PCI bus provides approximately 80 MB/sec of reliable bandwidth, and a 33-MHz/64-bit PCI bus provides approximately 160 MB/sec of reliable bandwidth.
    The 33-MHz/32-bit PCI bus will reliably support one to two 1394a adapters or one1394b adapter.
    The 33-MHz 64-bit PCI bus will reliably support up to two 1394b adapters.

    FireWire Bus Bandwidth
  • TA的每日心情

    2019-12-2 10:35
  • 签到天数: 51 天

    连续签到: 1 天

    [LV.5]常住居民I

    146

    主题

    483

    帖子

    1765

    积分

    Rank: 7Rank: 7Rank: 7

    积分
    1765

    优秀版主

     楼主| 发表于 2018-8-14 11:23:41 | 显示全部楼层
    本帖最后由 wenluderen 于 2018-8-14 11:46 编辑

    An IEEE 1394a bus supports image data throughput of 32 MB/sec while an IEEE 1394b FireWire bus supports throughput of 64 MB/sec.
    In a multi-camera configuration, make sure not to exceed these maximum rates.
    The data rate of a camera in MB/sec can be calculated as follows: (bytes-per-pixel * image-width * image-height * frames-per-second) / (1024 * 1024).

    For example, the data rate for a FireWire camera using format 0, mode 5 (640 x 480 mono) at 30 FPS would be: (1 * 640 * 480 * 30) / (1024 * 1024) = 8.79 MB/sec.

    PC System

    Number of FireWire Adapters: More than one adapter may be used at a time if the number of cameras required by an application exceeds the number of available DMA channels or the available bandwidth on an adapter.

    Note: Be careful not to exceed the available PCI bus bandwidth on a PC when using multiple adapters.
    PCI Slot Allocation: PCs typically support several bridged PCI buses. The available PCI slots on a PC may be allocated on more than 1 PCI bus. In the case where multiple FireWire adapters are used, knowing the PCI slot allocation might allow taking advantage of additional PCI bandwidth if adapters can be placed in slots that are allocated on separate PCI buses.
    PCI Bus Contention: Devices on the same PCI bus as a FireWire adapter will compete for available bus bandwidth. These may include display adapters, network cards, and PCI-based devices integrated onto the PC motherboard for audio, USB, and mass storage. Try to set up PCI-based devices on a PC to limit PCI bus contention for FireWire adapters.
    http://help.cognex.com/Content/K ... ion/Acquisition.htm
  • TA的每日心情

    2019-12-2 10:35
  • 签到天数: 51 天

    连续签到: 1 天

    [LV.5]常住居民I

    146

    主题

    483

    帖子

    1765

    积分

    Rank: 7Rank: 7Rank: 7

    积分
    1765

    优秀版主

     楼主| 发表于 2018-8-14 11:24:14 | 显示全部楼层
    还不让一次发出来,说是什么危险的连接??

    您需要登录后才可以回帖 登录 | 会员注册

    本版积分规则

    视觉培训招生

    建议您使用Chrome、Firefox、Edge、IE10及以上版本和360等主流浏览器浏览本网站

    51Halcon会员技术交流会员技术交流 | 51Halcon官方客服咨询官方客服咨询 | Halcon切换助手使用反馈切换助手使用

    算子查询| 申请友链| 小黑屋| 手机版| Archiver|

    © 2015-2021 51Halcon机器视觉  X3.4  粤ICP备15095995号 粤公网安备44030602000670号

    快速回复 返回顶部 返回列表