A long time ago (≈1975) I was involved in establishing a world standard for the measurement of the Optical Transfer Function (OTF). It is better known as its modulus, the Modulation Transfer Function (MTF). The OTF combines the MTF with the Phase Transfer Function (PTF). The OTF is a two dimensional Fourier transform of the Point Spread Function (PTF). Thus, it is a two dimensional frequency characteristic used for qualifying imaging devices and chains of imaging devices.

Since the image of a point contains very little energy, the OTF is measured by analyzing the Line Spread Function (LSF).

LONDON, August 19, 2010 /PRNewswire/ -- Mendeley (http://www.mendeley.com ), a  media technology startup billing itself as the world's largest research collaboration platform,  announced that Paul Brown will join the team as Chief Operating Officer, a newly created position, effective September 6, 2010. He comes to Mendeley from Spotify, a startup that is making waves in the digital music industry, where he most recently served as Senior Vice President of Strategic Partnerships.