IR on Aliasing Artifacts

Image Sensors World        Go to the original article...

Imaging Resource posted an interesting note on the recent trend to remove optical low pass filters over the sensors:

"There's been a strong move in the camera industry lately to remove low-pass filters (aka anti-aliasing filters or LPFs) from cameras, in pursuit of greater image sharpness... At IR, we feel strongly that eliminating low-pass filters is a bad idea, and a mistake for the industry. While the vast majority of natural subjects aren't subject to aliasing and moiré issues, many man-made objects have the sort of regular patterns that trigger the problem."

Imaging Resource supports its claim by real-world examples shot by one of the recent cameras with no optical anti-aliasing filter:

Example of color aliasing, caused by the fine thread patterns in the model's outfit.
Example of luminance moiré in the form of the swirly lines
in what should be diagonal louvers on the building's front.

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