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Greg Blackman looks at the latest developments in machine vision standards, including the new breed of interface standards to cater for high-bandwidth data transfer


he standards landscape for machine vision has grown considerably over the last five years; the most notable shiſt


being the introduction of interfaces catering for higher speeds, such as Camera Link HS and CoaXPress, and to a certain extent USB3 Vision. Tese are the newest interfaces and the ones that will support the bandwidth demands of future digital cameras based on higher resolution and faster image sensors. Tere are other considerations though


apart from speed. Bob McCurrach, director of standards development at AIA, the industry body for North America, commented: ‘Te biggest need, or at least perceived need, is for greater speeds. However, if my thoughts on market penetration are correct, advances in usability and improved costs may be just as important.’ Tere is also other functionality for


technology such as 3D vision, which is being built into GigE Vision and GenICam to take into account the growing use of these cameras in industry.


26 Imaging and Machine Vision Europe • Yearbook 2014/2015


Need for speed Te faster interfaces have come about to meet the bandwidth demands of the latest image sensors, and particularly CMOS sensors as they gradually take over from CCDs for industrial vision. ‘Te new generation of upcoming CMOS global shutter sensors has an image quality like CCD sensors but is much faster and cheaper,’ said Dr Friedrich Dierks, director of platform development at Basler and chair of the GenICam committee. A good example is the Sony IMX174, a global shutter CMOS sensor that offers a dynamic range of 73dB, peak quantum efficiency of 76 per cent, and runs at 1,900 x 1,200 pixel resolution at a frame rate of 162fps. Te two high-speed interfaces developed


specifically for machine vision are Camera Link HS, the successor to Camera Link, and CoaXPress, which was ratified at the end of 2010 and uses coaxial cable to transport data and power. Te two are competing to a certain extent for the high-speed market, while still having their own advantages.


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