TECH FOCUS: LINE SCAN IMAGING


Commercial products


Among the latest line scan cameras is the Necta S from Alkeria, a USB3 model based on a SWIR InGaAs sensor. The SWIR camera, imaging from 950nm to 1,700nm, can reach a line rate of up to 40kHz with 14-bit ADC. The camera is housed


in a compact and rugged aluminium case. It is designed for applications where infrared vision is crucial: medical applications; fruit, vegetable and grain sorting; packaging inspection; plastic and rubbish recycling; solar and silicon wafer inspection; among others. Necta S comes in two


variations: 512 x 1-pixel and 1,024 x 1-pixel sensors. Both models can be equipped with C-mount and F-mount lens adapters. JAI has introduced four 8k models in its Sweep+ series of prism-based line scan cameras: two three-CMOS


RGB models and two four- CMOS multispectral (RGB and NIR) models. The cameras are equipped with three or four 8k CMOS sensors mounted on a dichroic prism that separates the incoming light into red, green and blue (and NIR) wavebands, providing high colour accuracy for line scan applications. The cameras are available with either a 10 GigE interface or a small form-factor pluggable (SFP+) interface that delivers GigE Vision output via optical fibre cables. The four-CMOS versions


can transmit image data as a single combined stream using the RGBa8 pixel format, or a dual-stream format with RGB or YUV data on one stream and NIR images on the other. The dual stream configuration supports 8 or 10-bit output per channel with a maximum line rate of 36kHz for 8-bit RGB and NIR data, or 37kHz for YUV and NIR data. For single-stream RGBa8 output the maximum line rate is also 37kHz. The three-channel versions


transmit a single RGB stream at 49kHz or 8k compressed colour output at 73kHz. The cameras offer a built-in


JAI Sweep-Plus SW-8000Q


colour conversion function that allows the colour output to


Finally, BitFlow has Yantra Vision’s Falcon Compute


be provided in HSI or CIEXYZ if needed. They also support the precision time protocol IEEE 1588 for multi-camera networked configurations. Indian firm Yantra Vision’s


newest camera, the Falcon Compute, is an FPGA- integrated machine vision product designed for high speed, real-time applications with cycle times in the microseconds. The camera offers 30kHz line rate. The Xilinx Zynq SoC-


powered product is used for real-time area and line scan applications that require high- speed capture, high resolution and low latencies. The cameras have a Camera


Link interface and can process images using FPGA overlays. Xilinx has combined multiple FPGA image processing IPs into overlays that can be included for processing using a Python API call.


expanded its Claxon series of Coaxpress CXP-12 frame grabbers with a single-link version that transfers image data from a CXP camera to the host memory at speeds of up to 12.5Gb/s. The Claxon CXP1 provides developers of smaller-scale, yet complex vision systems with a deterministic, zero-latency pipeline ideal for high-speed line scan inspection of printed materials or textiles.


BitFlow’s Claxon CXP1 The frame grabber takes


advantage of a half-size PCI Express expansion bus and StreamSync DMA to deliver the sustained bandwidth needed to support acquisition from one of the single-link CXP-12 cameras. The frame grabber has an uplink interface of up to 41.6Mb/s, and simplifies integration by supplying 13W of power through PoCXP, all on a single coaxial cable using micro-BNC (HD-BNC) connectors.O


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