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JAI has added the AT-140CL and AT-200CL to its 3CCD colour camera series.

The new cameras provide a larger sensor format and higher resolution than previously available 3CCD RGB models.

The AT-140CL features three 1/2in (12.7mm) progressive-scan CCDs (Sony ICX267AL), each with a resolution of 1392 x 1040 pixels and an individual pixel size of 4.65 x 4.65 microns.

The AT-200CL uses three 1/1.8in progressive scan CCDs (Sony ICX274AL) to provide a resolution of 1628 x 1236 pixels with an individual pixel size of 4.4 microns square.

The CCDs are affixed to a newly-developed prism block that splits the incoming light into red, green, and blue colour channels.

JAI’s alignment process ensures the three sensors are aligned to within 1/4-pixel accuracy, providing pixel-precise colour values suitable for machine-vision analysis, measurement and processing.

This is in contrast to 3CCD cameras that utilise ‘pixel offset’ methods to increase perceived on-screen resolution, while sacrificing the precision of the digital output.

The AT-140CL operates at 25 frames per second with full 3 x 1.4-megapixel output via a Camera Link digital interface.

The AT-200CL operates at 20 frames per second with full resolution.

Users can select 3 x 8bit RGB output via a single-port Camera Link base configuration, or can use the cameras’ dual Camera Link connectors to output 3 x 10bit or 3 x 12bit RGB data via a Camera Link medium configuration.

The AT-140CL and AT-200CL are the first 3CCD progressive scan cameras to offer 3 x 12bit RGB output, enabling them to distinguish between subtle colour variations.

Significantly faster frame rates than the base rates can be achieved via the cameras’ partial scan and vertical binning modes.

Partial scanning includes four preset modes with frame rates in excess of 70fps for 1/8 partial scan, as well as a user-programmable mode with scan heights ranging from a single line to a full frame.

A variety of features are provided to optimise image quality for specific applications and lighting conditions.

Included are four white balance modes (manual, one-push auto, continuous auto and preset colour temperature), three gamma settings plus a look-up table (LUT), automatic shading compensation, blemish compensation, a knee function with individually adjustable RGB values, and a linear colour matrix circuit enabling users to manually adjust each colour channel or choose from pre-defined industry-standard settings developed by HP, Microsoft and Adobe.

With their high resolution and high colour fidelity, the AT-140CL and AT-200CL are expected to expand on the popularity of previous JAI 3CCD models, which have been widely used in semiconductor production, food sorting, print inspection, flat-panel quality verification, and in medical devices for patient diagnostics.

Multiple trigger modes and programmable or pre-set shutter speeds faster than 40 microseconds make the AT-140CL and AT-200CL suitable for a variety of machine-vision applications.

JAI is also developing versions of the AT-140 and AT-200 cameras with GigE Vision interfaces.

Other 3CCD colour models offered by JAI include two 0.8 megapixel progressive scan cameras with either Camera Link or GigE Vision output and an interlaced scan model offering analogue RGB, VBS or Y/C (S-video) output.

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