Maximizing performance in triggered USB cameras
Master Mode for USB uEye® Cameras
When two devices are connected via USB, the USB architecture requires one of them to act as the master controlling data traffic on the bus. That is usually done by the PC. Peripherals, such as cameras, run in slave mode: they can only transmit data when the host PC requests it. Consequently, a USB camera in trigger mode previously had to be set to ready state first before each image capture.
The new master mode offers a solution that removes these USB protocol constraints. By passing control of image data transfer to the connected cameras, it makes maximum use of the USB 2.0 bandwidth and allows for very high frame rates with external triggering: the triggered frame rate now reaches the same level as in live mode, where the camera continuously transfers images. In Area-of-Interest (AOI) mode, in which the sensor transfers only a specific part of the image, USB cameras can now process several hundred trigger pulses per second.
The USB master mode is included in the latest driver version 3.33 and is available as an update for all USB uEye® cameras. Among the many new features and enhancements of this software package are new API functions, sample programs with source code, and additional subsampling and binning modes. The new USB uEye® ME models are also supported by this driver version.
Customers can download the new driver version for free from the manufacturer's web site (http://www.ids-imaging.com/...).
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