15940 Robin’s Hill Rd, London, Ontario N5V 0A4, CANADA
T. +1 (519) 663-9570
ADVANCED GLOBAL SHUTTER SENSORS
The CMOS image sensors used in the Redwood camera series feature advanced charge-domain global shutter capability with light pipe technology. Global shutter means all pixels across the sensor capture light during the same period of time. In contrast, sensors which use a rolling shutter technique will stagger the start of exposure throughout the rows of the image. This leads to motion artifacts in fast-moving scenes, as well as uneven frame illumination if bright flashes occur partway through the exposure period. At the pixel level, global shutter capability is implemented through in-pixel circuitry, however as pixel sizes are decreased to allow higher resolutions, too much in-pixel circuitry reduces the pixel’s sensitivity. The AMS CMV12000 sensor features a global shutter design which minimizes in-pixel circuitry, as well as microlenses to maximize the light-gathering capability of each pixel. These features work together to provide top-quality high-resolution images of fast-moving objects without motion artifacts.
HIGH SPEED DIGITAL VIDEO OUTPUTS
CoaXPress is a high-bandwidth digital video interface. High-speed and high-resolution images can be transmitted reliably over long distances through single or multiple coaxial cables, or fiber optic cables for very long distance applications. Developed as a next-generation standard for the machine vision industry, CoaXPress serves many advanced imaging applications across many markets. CoaXPress combines high-speed serial link technology and low-cost cabling to form a bidirectional full-duplex communication path between video sources (ie. cameras) and video receivers (ie. frame grabbers or DVRs). Using coaxial connections, power can be delivered to the camera as well, eliminating the need for a power source at the camera’s location. With advancements in image sensor technology, a high-performance interface is needed to allow the full bandwidth of these sensors to be utilized. The throughput limits of existing video interfaces such as 1-10 GigE Vision, USB3 Vision, and even Camera Link are easily eclipsed by the bandwidth of sensors such as those used in the Redwood camera series. Additionally, system designers using cameras with these interfaces are faced with limitations regarding cable length, robustness, complexity, and cost. The Redwood cameras are available with either four coaxial outputs, each capable of 12.5Gbps data rate, or an equivalent-rate optical output using QSFP+ transceivers.
MULTI-ROI READOUT, SUBSAMPLING AND BINNING FEATURES
Several image formatting and manipulation features are provided in the feature set of the Redwood camera series. For inspection applications, a single camera can be used to provide highly detailed images of a wide area, but if known regions of interest (ROI) within the field of view are the only portions needing to be inspected, the camera’s multiple-ROI readout feature can minimize the data needing to be transferred to the processing system. Up to 16 separate non-overlapping window areas can be created, and a composite image of those regions is transmitted rather than the entire sensor image. This can help to also increase the camera’s frame rate, as the sensor will skip rows above, between and below the defined ROIs. Other features allow for optimizing the camera’s output data rate in different ways. Subsampling (pixel skipping) allows the full field of view to be transmitted at a lower resolution, but at higher frame rates. Binning and Averaging (digital, off-sensor) allow for optimization of the sensitivity or signal-to-noise ratio of the delivered images.
HIGH DYNAMIC RANGE
The Redwood 120C335 offers several options for optimizing how much dynamic range of a scene can be captured in each image. Standard exposure mode is available with 8, 10, or 12-bit depth, and a selection of on-camera look-up tables (LUTs) can apply gamma and other contrast-adjusting adjustments. In addition, two high dynamic range exposure modes are available to further extend the dynamic range capabilities of the camera. In normal exposure modes, operators must decide the exposure time to be applied to all pixels in the sensor for that frame period. In the case of high dynamic range scenes, this is often at the expense of either shadow or highlight details. With the piecewise HDR exposure mode, operators can define a multi-slope exposure response curve, selecting kneepoints where pixels will be automatically reset if they reach a certain level partway through the exposure time, and begin re-accumulating charge until the end of the exposure time. With the Interleaved HDR exposure mode, operators can independently control the exposure time of the odd and even columns of the sensor, allowing two separate exposures to occur within the same frame period. With either on-camera or post-processed image fusion tools, final images can be produced with greatly increased intra-frame dynamic range.
HIGH RESOLUTION AND HIGH FRAME RATE
The Redwood™ series is a family of high-throughput industrial video cameras designed with some of the fastest high-resolution CMOS image sensors available today. The 120C335 models feature the AMS CMV12000, an APS-C 12.6MP global shutter sensor. At full 4096 x 3072 resolution, frame rates up to 335fps (8-bit output), 299fps (10-bit output) or 132fps (12-bit output) can be achieved. Using a selectable sensor window area, the 120C335 can output Ultra-HD 3840x2160 at 475fps, or HD 1920x1080 at 936fps. The high-sensitivity 5.5μm square pixels use global shutter technology for artifact-free motion imaging. Both monochrome and color camera models are available to suit a variety of applications in industrial and scientific imaging, wide area observation, as well as virtual reality and special effects.
All contents on this website are copyright IO Industries Inc. 2021, all rights reserved.