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Global shutter


CMOS image sensors developed for machine vision applications


CMV, CMOSIS Machine Vision, stands for a family of high speed, global shutter CMOS image sensors optimized for machine vision applications, with pixel array resolutions ranging from VGA up to 20 million pixels.


improvements to the existing specification to better clarify it, as well as validation test coverage. Tere is also an effort to enhance the standard for implementers and end users. Additionally, according to Gross, there


are various research projects that may turn into feature additions for future versions of the USB3 Vision specifications. Some of these include: bandwidth measurement functionality for system-level reliability testing; a mechanism for lowered overhead of very-high-speed acquisitions (10,000+ frames per second); multi-part data streams to enable extensions like 3D image formats; and multi- camera synchronisation over the USB bus.


Shifting landscape Te new standards, like USB3 Vision, add more choice for those installing machine vision systems, and provide suitable interfaces for the latest generations of cameras. Ten years ago, Camera Link and FireWire were the only options, and Camera Link remains a viable standard. It has a large installed base and supports data rates up to 6.8 Gb/s. Steve Kinney, technical director at JAI and


chairman of the Camera Link committee, commented: ‘Camera Link continues to be well suited for applications requiring absolute deterministic data transfer, real-time signalling, and/or applications that will rely on the use of a frame grabber. ‘Camera Link offers the simplest, low-


cost interface at these bandwidths for frame grabbers and cameras.’ As well as the gradual shiſt away from


CCD to CMOS sensors, which offer higher frame rates at low cost, Carey noted that one potential trend is the introduction of cameras with greater intelligence in the form of onboard image processing. ‘Original camera standards, such as Camera Link, were more hardware oriented,’ he said. ‘Today’s GigE Vision and USB3 Vision are


more soſtware-centric to reflect the evolution towards increased functionality. Simply look at the high number of features now offered by these new [smart] cameras. Tis is a trend that is going to continue with the progress made by FPGA technology.’ Dierks of Basler commented that he sees


the next interface as being IMO USB 3.1, which has double the bandwidth compared to USB 3.0 and uses optical cables. ‘Te sensor makers’ roadmaps already contain mainstream sensors with 700 MB/s, so there is a true need for that extension,’ – i.e. a frame- grabber-less interface with the necessary bandwidth. ‘Since the consumer market seems not to be


willing to breed (cheap) optical cables suitable for the machine vision market, this will be a major task for future standard enhancements,’ he added, ‘both for frame-grabber-less interfaces like USB 3.1, but also for frame- grabber interfaces.’ O


… now also all Awaiba image sensors!


• Pipelined global shutter 8T based active pixels with in-pixel CDS (Correlated Double Sampling) correction • High frame rate


• Row windowing capability • X-Y mirroring function • On-chip PLL • LVDS-data interfacing with LVDS con- trol line with frame / line information and DDR output clock to sample data on the receiving end


• Multiple High Dynamic Range modes supported


• On chip temperature sensor • On chip timing generation • SPI-register control • 3.3 V and 1.8 V signaling • Available in monochrome and RGB Bayer version


CMOSIS · Coveliersstraat 15 2600 Antwerpen · Belgium www.cmosis.com · info@cmosis.com


Inara Prusakova/Shutterstock.com


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