Burst mode

Introduction

Depending on the resolution and the frame rate, the available bandwidth could become the bottleneck during image acquisition (see table).

Interface

Gross bandwidth in MBit/s

Net bandwidth in MByte/s

Gigabit Ethernet 1000 120
Dual Gigabit Ethernet 2000 240
USB 3.0 5000 300 + x

For this reason, the cameras mvBlueCOUGAR-X, mvBlueCOUGAR-XD, and mvBlueFOX3 offer an internal image memory and the so-called burst mode. The burst mode buffers the acquired images and decouples the acqusition from the image output. With this, you can use the sensor's maximum frame rate independently from the available bandwidth.

tl_files/mv11/Newsletter/2013/UseCase_BurstMode_Principle.png

Note: The image memory is the same in each product family, for this reason the buffer size depends on the sensor's resolution. The maximum buffer size can be found in "Setting → Base → Camera → GenICam → Acquisition Control → mv Acquisition Memory Max Frame Count"

Instructions

To create a burst mode buffering of images, please follow these steps:

  1. Open wxPropView.
  2. Select the camera, and switch the "User Experience" selector to Guru.
  3. Set image acquisition parameter ("Setting → Base → Camera → GenICam → Acquisition Control → mv Acquisition Frame Rate Limit Mode") to mvDeviceMaxSensorThroughput.
  4. Finally, set the acquisition parameter mv Acquisition Frame Rate Enable to Off.

Afterwards, you will reach the sensor's max. frame rate until the  internal image memory is full.

 

Alternatively, you can set the burst mode via the desired input frames and the desired output bandwidth:

  1. Open wxPropView.
  2. Select the camera, and switch the "User Experience" selector to Guru.
  3. Set image acquisition parameters to the desired input frames per second value ("Setting → Base → Camera → GenICam → Acquisition Control").

    tl_files/mv11/Newsletter/2013/UseCase_BurstMode_01.png
  4. Set bandwidth control to the desired output bandwidth (in MByte/s) out value in "Setting → Base → Camera → GenICam → Transport Layer Control → Gev Stream Channel Selector → mv Gev SCBW Control".

    tl_files/mv11/Newsletter/2013/UseCase_BurstMode_02.png

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