Gigvision standard of the hottest machine vision p

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GigE vision standard of machine vision products

gige vision is a camera interface standard developed based on Gigabit Ethernet communication protocol. In the application of industrial machine vision products, GigE vision allows users to use cheap standard cables for fast image transmission over a long distance. It can also easily achieve interoperability between software and hardware from different manufacturers

the automated imaging Association (AIA) supervises the continuous development and implementation of this standard. GigE vision was developed by a team of 50 companies. These companies include adimec, ATMEL, Basler AG, cyberoptics, DALSA, Jai a/s, Jai pulnix, Matrox, national instruments, photofocus, pleora technologies and Stemmer imaging. GigE vision is based on Gigabit Ethernet standard and uses standard Ethernet cables. It attempts to unify the current protocols for industrial cameras in machine vision products, and allows third-party organizations to develop compatible software and hardware

many products have been able to support this standard. National Instruments provides a high-performance dual Gigabit Ethernet interface for PXI express, and Jai has released two high-performance 16 megapixel cameras equipped with a standard GigE Vision digital interface

Paul Kellett, director of AIA's market analysis department, said, "since the implementation of the standard in 2006, GigE vision camera shipments have increased sixfold and sales revenue has increased fivefold. This has dispelled people's doubts about whether the importance of GigE vision can continue to grow." He added that we should not confuse those devices that only claim to be "GigE" with GigE vision. GigE devices may adopt the Ethernet connection control engineering copyright, but devices without the "GigE vision" logo cannot use GigE vision. 2017 is the 50th anniversary of the birth of DuPont Tyvek teweiqiang brand. The communication protocol control engineering copyright is owned, and GigE vision compatible devices cannot be connected in a plug and play manner

gige vision standard's feature package fully realizes the surpassing of foreign products, including fast data transmission rate - up to 1000mbit/s (based on 1000BASE-T transmission medium standard) - and transmission distance up to 100 meters (some manufacturers even claim to be up to 150 meters). This distance exceeds the transmission distance of IEEE 1394, USB and Cameralink communication protocol, which is also managed by the Association for automated imaging and is also applied to machine vision products. When a converter or repeater is used, the transmission distance can be further increased. If the cable used is a simplified form, a separate cable is needed to power the camera

gige vision is mainly composed of four parts:

■ GigE vision control protocol based on UDP protocol: this standard defines how to control and configure equipment. It specifies the flow channel and mechanism for sending images and configuration data between the camera and the computer

■ GigE vision flow control protocol: this protocol covers the definition of data types and the way of transmitting images through GigE

■ GigE device discovery mechanism: this mechanism provides a method to obtain IP addresses

■ XML description file based on genicam standard: this data form provides access to camera control and image data flow

last month, the GigE vision standards committee released version 1.1 of the standard and announced some new features. In addition, the standard - originally published only in English - now has a Japanese version. Eric Carey, chairman of the GigE vision standards committee, stressed: "this is the first revision of the standard since its introduction. Although the revised version does not introduce new camera features, its detailed modifications enable developers and camera manufacturers to better control the internal process, thus providing a more comprehensive camera solution."

carey said that the Committee hopes that the interface can keep up with the growth of Ethernet bandwidth. Moreover, as the agreement gradually becomes mainstream, the Committee has planned to integrate the 10gige agreement

some new features of this version are covered in a large number of updates, declarations and improvements. These new features include support for new pixel formats and Bayer formats; Improved error handling function; Support multiple versions of genicam diagrams and genapi, as well as new commands that can send action commands and manage execution time to multiple devices at the same time

many existing devices can already support this standard. For example, in June, 2008, National Instruments released its first high-performance dual Gigabit Ethernet interface for PXI express. In April, 2009, Jai launched two new 16million pixel cameras equipped with a standard GigE Vision digital interface. These cameras work with any but low elastic modulus; Application development tools that meet GigE vision or genicam standards are compatible, and support Jai's own camera control tools and software when there is too much oxide skin. (end)

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