WEBVTT

NOTE Paragraph

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Imatest software, charts, and equipment allow you to 
measure the characteristics and quality of imaging systems.

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Here we’ll outline two methods for centering test charts, 
which is critical for image quality testing.

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If the camera is not properly aligned with the test chart, 
your image may not be suitable for analysis.

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You may not know if the results are truly indicative of the camera system, 
or from an error in positioning the chart. 

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If the optical axis is offset relative to the center of the target, 
the resolution regions of interest can become asymmetrical,

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shifting from the ideal radial field distance
and introducing error in your map of sharpness across your imaging plane.

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If the device is tilted relative to the target, 
measurements of keystone distortion and convergence angles will have reduced accuracy.

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Controlling the alignment of the camera relative to 
the test chart is the best practice to prevent these errors.