tag:blogger.com,1999:blog-1924948806084793655.post5072948152026794504..comments2023-09-26T11:36:56.423-04:00Comments on Machine Vision 4 Users: Camera interface standardsUnknownnoreply@blogger.comBlogger1125tag:blogger.com,1999:blog-1924948806084793655.post-90466149725054919932015-06-09T00:09:41.116-04:002015-06-09T00:09:41.116-04:00Certainly GigE Vision has seen strong growth over ...Certainly GigE Vision has seen strong growth over the last several years. It is fast enough for most applications, and the long cable lengths were a big improvement from IEEE-1394. But I'd encourage you to take a closer look at USB3 Vision.<br /><br />The first cameras to support USB3 were mostly a rehash of GigE cameras. Same sensors, same frame rates, different connector. But there is a slug of new cameras just becoming available that take better advantage of USB3. For example, Basler is introducing several new cameras with On Semi Python and Sony IMX sensors. Consider what can be done with an inexpensive camera that can grab 150 (1920 x 1200) to 850 (640 x 480) frames a second. That's data rates nearly comparable to CameraLink Medium configurations, but without the frame grabber.<br /><br />Many of the criticisms of USB3 hold true for GigE as well. Yes, USB3 performance varies greatly with chipset and driver. But some GigE drivers support a performance mode (direct memory access and jumbo packet support) with specific chipsets, and other GigE drivers don't support a performance mode at all. Some USB3 implementations perform well below spec, but Ethernet in general always delivers far less data than the theoretical limits.<br /><br />On the other hand, USB3 Vision is more efficient than GigE, saving more CPU power for the image processing tasks. (You might notice than the newer Basler USB3 cameras are physically smaller than their GigE counterparts and, in the case of CMOSIS sensors, cost less too.) And USB3 Vision (combined with a good chipset) has far less jitter than GigE Vision.<br /><br />Whenever I'm asked whether to use a GigE or USB3 camera, I ask about the necessary cable length. If its short, and if there is an appropriate USB3 camera available, I suggest going with USB3. Now, with more USB3 cameras becoming available, the decision is even easier.<br /><br />Additional info:<br /><a href="http://machinevisionstore.com/content/downloads/basler/about-usb3-vision.pdf" rel="nofollow">Data, Facts, Setup and Migrating to USB 3.0</a><br /><a href="http://www.baslerweb.com/media/documents/USB3.0_Host_Controllers_Max_Bandwidth_rev8.pdf" rel="nofollow">USB 3.0 Host Controllers' Maximum Bandwidth Measurements</a><br /><a href="http://machinevisionstore.com/content/downloads/basler/Camera-interface-comparison.pdf" rel="nofollow">Comparison of the Most Common Digital Interface Technologies</a><br /><a href="http://machinevisionstore.com/tech/usb3" rel="nofollow">USB3 Vision Technology Center</a>Brian Durandhttp://machinevisionstore.com/tech/usb3noreply@blogger.com