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Digital Network Vision
Products for Machine Vision/Image Analysis/Security
February 2007 - Vol 2, Issue 2
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For the latest in products for image processing and machine vision in North America, Digital Network Vision supplies a wide range of USB cameras, smart cameras, Gigabit Ethernet cameras, frame grabbers, and integrated machine vision software.

mvBlueLYNX
The smart camera mvBlueLYNX is used as an autonomous and adaptable tracking system. At this the camera uses three concepts: Usind particle filtering techniques enables the robust handling of multimodal pdfs and nonlinear systems. An adaptivity mechanism increases the robustness by adapting to slow appearance changes of the target. A simple diagnosis unit controls the degree of adaptivity. It is based on a confidence measure of the tracker.

The camera system calculates all data inside the system and displays only the results. The camera can be used for robotics (visual servoing) and for surveillance (person tracking).
mvBlueFOX
CMOS Sensor errors can be corrected with the FPGA in the mvBlueFOX USB camera. The following can be corrected. - Defective pixels correction - Dark current correction - Flatfield correction

1. Defective pixels Due to random process deviations, not all pixels in an image sensor array will react in the same way to a given light condition. These variations are known as blemishes or defective pixels. There are two types of defective pixels: 1. leaky pixel (in the dark) 2. cold pixel (in standard light conditions)

2. Dark current Dark current is a characteristic of image sensors, which means, that image sensors also deliver signals in total darkness. This effect is provoked by warmness, which creates charge carriers spontaneously. This signal overlays the image information. The production of dark current depends on two circumstances: 1. exposure time The longer the exposure, the greater the dark current part. I.e. using long exposure times, the dark current itself could lead to an overexposed sensor chip. 2. temperature By cooling the sensor chips the dark current production can be highly dropped (approx. every 6 °C the dark current is cut in half).

3. Variations of sensitivity Strictly speaking: each pixel of a sensorchip is a single detector with its own properties. Particulary this pertains to the sensitivity as the case may be the spectral sensitivity. The difference of the sensitivity depending on the sensor can be more than 10 %. This is too much for being ignored, the differences have to be corrected. To solve this problem, a perfect equal background as a flatfield is snapped, which will be used to correct the original image.
Validator
Avalon Vision offers a complete easy to use vision solution with the mvBlueFOX.

Features:
  • Simple Point-and-Click Interface
  • Flexible Vision Tool Set
  • Save Hundreds of Pre-taught Configurations
  • Supports up to 8 Cameras
  • Easily Debug On-Line with Built-in DVR
  • Ideal for a Broad Range of Applications
  • Use any Windows Controller with USB2.0
  • No Development/ No Additional Runtime Licenses

If you have an application that you would like to share with a link to your web site, please contact me.

Sincerely,
John Morrissey
Digital Network Vision, LLC

phone: (888) 701-0874
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