Modulation transfer function evaluation for red/clear filtered optical devices

A system for evaluating a modulation transfer function (MTF) of a device under test comprising a red/clear (RCCC) color filter, the system comprising:

• a pattern source that provides a pattern suitable for use in the evaluating the MTF via a slanted method;
• the device under test, which images the pattern to provide an image comprising a plurality of filtered pixels, each having an associated brightness value, and a plurality of unfiltered pixels, each having an associated brightness value;
• and
• an image analysis system that determines, for each of a plurality of filtered pixels, an axis of a plurality of axes having a lowest curvature, wherein a first axis of the plurality of axes is not orthogonal to a second axis of the plurality of axes, generating an interpolated image having a new brightness value for each of the plurality of filtered pixels as a function of respective brightness values for a set of unfiltered pixels selected from a first-order Moore neighborhood of the pixel, the set of pixels being selected along the axis having the lowest curvature, and determines the modulation transfer function from the interpolated image.