JAI introduces advanced HDR camera
A
JAI product story
Edited by the Engineeringtalk editorial team
Feb 17, 2009
JAI has added the AD-081CL high dynamic range (HDR) camera to the Advanced tier of its C3 Camera Suite.
The AD-081CL features a dual-CCD design with two standard ICX204AL 1/3in monochrome progressive scan sensors mounted to a custom-designed optical prism.
The prism-based design enables the camera to simultaneously capture two channels of 30fps video, with each channel having 1024 x 768 resolution, 8- or 10-bit pixel depth, and precise alignment to the same optical axis.
The shutter speed and/or gain for each channel of the AD-081CL can be calibrated independently, such that one channel captures details in the brighter areas and the second captures the identical image, but with an emphasis on the details in the darker areas.
The two images can then be analysed separately or post-processed with an image fusion algorithm to produce a dynamic range nearly double the normal CCD response.
This enables the AD-081CL to achieve dynamic range levels as high as 20-bits per pixel without encountering the type of noise issues found in similar-performing Cmos HDR cameras.
JAI has developed a precise manufacturing process to align the two prism-mounted sensors to within one-quarter pixel accuracy.
This enables the AD-081CL's high dynamic range capability to be applied to inspection tasks regardless of whether or not the objects are in motion.
Typical HDR applications for the AD-081CL include inspection tasks where incident light or bright reflections are present, such as LED inspection, welding, and various types of lighting or glass inspections.
The camera is also suitable for a wide range of automotive applications, microscopy, or high-end surveillance uses.
The parameters of each CCD can be adjusted by the user to provide maximum dynamic range or maximum contrast/sensitivity within a narrower lighting range, depending on the application.
In addition to HDR mode, the AD-081CL can be configured to interleave the images from the two CCDs into a single output stream.
This high-speed/low-noise mode enables the camera to operate at 60fps without any increase in the clock frequency of the camera, thus keeping clock noise to an absolute minimum.
Also included is a PIV mode, which leverages the camera's two-channel operation to capture three closely-spaced images on a single trigger instead of the two captured by conventional PIV trigger modes.
This allows 50 per cent more data to be collected to better analyse ultra-fast events such as vortex forming in artificial heart chambers, combustion analysis in engines, and air flow studies in wind chambers.
The AD-081CL is equipped with two configurable Camera Link outputs providing users with a choice of single-cable operation or separate cables for each channel.
Other features include partial scanning and vertical binning capabilities, as well as analogue video output to support auto-iris lenses.
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