Closing the Loop: Distortion Correction

Imatest’s charts and software allow you to measure the characteristics and parameters of imaging systems. Quite often these measurements simply indicate the limits of system performance and expected image quality.

But some Imatest results let you improve image quality— and subsequent images taken by the same system— by correcting measured aberrations. No new components need to be purchased; no judgement calls need to be made. All it takes is some math and computation, which you can apply in our own external program or with an Imatest module. This is an aspect of image processing pipeline tuning, which is usually done by a dedicated Image Signal Processing (ISP) chip in a device to transform raw sensor data into an appropriate image. 

At Imatest, we informally call this “closing the loop”, because it completes the cycle from the camera-under-test to measurement, back to the camera (in the form of an adjustment). 

Today, we’re going to illustrate how to use radial distortion measurements from Imatest to correct for optical distortion (without buying a new lens). (more…)

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