Some of the advantages of the Camera Link interface as implemented in Basler cameras are:
- Easy camera/frame grabber integration.
- The connectors, cables, data format, and control signals are defined.
- Since the cables are an industry standard, users will be able to take advantage of competitive pricing.
- The high data rates of the chip sets used in Camera Link compatible devices can easily handle current image data transmission requirements.
IEEE 1394
Basler is at the vanguard of digital image capture and processing technology including the latest technology in camera interfaces. IEEE 1394 promises a breakthrough in the connection between digital cameras and computers. Basler has implemented IEEE 1394 technology into its cameras.
Some of the advantages offered by Basler's IEEE 1394 cameras include:
- Only purpose built industrial cameras available
- Easier system integration at a lower cost
- trigger ready signaling,
- integration enabled signaling,
- change on the fly optimization
- Fastest full resolution 1300 x 1030 camera available
GenICam
Cameras currently used in machine vision are all configurable in more or less the same way – by reading and writing parameters in registers. Protocols, formats, and register locations, however, tend to differ from manufacturer to manufacturer.
The objective of GenICam is to provide a universal programming (configuration) interface across a wide range of standard physical interfaces such as GigE Vision, Camera Link®, and IEEE 1394, regardless of the camera type and image format.
- This approach makes it easy to connect cameras compliant with the GenICam standard without the need for camera-specific configurations.
Using this file, a translator directly generates a C++ Application Programmable Interface called GenAPI or the elements of a Graphical User Interface (GUI).
- This lets the user easily identify the camera type, as well as the features and functions available on the camera and the parameters associated with each camera function.
- Future extensions of GenICam will also provide mechanisms for grabbing and streaming images from the camera.
- The proposed GigE Vision standard stipulates that cameras must provide the XML Descriptor File.
- A Descriptor File for IEEE 1394 compliant cameras will be available as well.
Sensortechnologie
Basler uses both CCD (charge coupled device) and CMOS (complementary metal oxide semiconductor) image sensors in its cameras.
- The basic job of CCD and CMOS sensors is to convert light (photons) into electronic signals (electrons).
- The main difference between the two sensor types is the technical design of the sensor itself.
- Based on a camera's target application, Basler design engineers select the most appropriate sensor technology.
CCD sensors have been available for the last 25 years and they have been very successful in the industrial and consumer markets.
- A variety of technical advantages have made CCD sensors the preferred choice in the industrial marketplace for quite some time.
- But the many recent improvements in CMOS technology driven by memory device development have been a great benefit to CMOS sensor performance.
- A comparison of some of the technical details can be found in the table below.
In general,
- the low noise level,
- high fill factor
- good signal-to-noise ratio
- These characteristics make cameras based on CCD sensors a good fit for machine vision applications.
- CMOS sensors have made a path into machine vision based largely on their advantage in speed (frame rate) and resolution (number of pixels) compared to CCD imagers.
- Improvements in CMOS technology and demand from high volume users such as the automotive market are making CMOS image sensors more and more attractive for machine vision applications.
Basler’s broad product portfolio of CCD and CMOS cameras includes sensors from several different vendors.
- Basler continuously scouts the market to find sensors that meet the needs of machine vision and related systems.
- We then build cameras which emphasize the strengths of each sensor regardless of whether the sensor is CCD or CMOS.
The main technical differences between CCD and CMOS sensors include:
| Parameter | CCD | CMOS | ||
| Fill Factor | High | High | ||
| Dark Noise | Low | Medium | ||
| Signal-to-Noise Ratio | High | Medium | ||
| Dynamic Range | Medium | High | ||
| Speed | Medium | High | ||
| Area of Interest | Limited | Individual | ||
| Blooming | Yes | No | ||
| Smearing | Yes | No |
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Basler Components is leading the effort to standardize image quality and sensitivity measurement for machine vision cameras and sensors.
The EMVA 1288 standard includes a well defined method for measuring most common noise sources.
A downloadable version of the first draft of the EMVA 1288 standard is available from the EMVA web site at www.standard1288.org.
- All measurements done by Basler will be in 100% compliance with the upcoming new European Machine Vision Association "EMVA 1288" standard.
- Because it describes a unified method to measure, compute and present the specification parameters for cameras and image sensors used in machine vision applications, Basler is giving the EMVA 1288 standard our strongest support.
- In future, we will routinely provide compliant information about the quality and sensitivity of our products.
The EMVA 1288 standard includes a well defined method for measuring most common noise sources.
- It also includes a mandatory and detailed description of measurement setups, environmental conditions and test requirements.
- As a first step, only the standardization process for monochrome area scan cameras is covered.
- An expansion covering the standards for color area scan cameras and for line scan cameras is expected to follow.
A downloadable version of the first draft of the EMVA 1288 standard is available from the EMVA web site at www.standard1288.org.
- A Basler Components white paper called "Sensitivity and image Quality of Digital Cameras" gives you extended background information on the methods used in the standard .
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