Extended K2T measurement of video
AssigneeTektronix, Inc.
InventorKevin M. Ferguson
Life of this patent
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Abstract
K2T measurement of video signals, regardless of video format, is determined by generating a graticule using an algorithm having a single variable that is a function of the video format for the particular video signal. The graticule is set to a normalized value of one for a range of +/−T, where T is a function of the video format. The graticule is set to a normalized value over a range of +/−(1.5T to flatBreak) according to a human vision masking model algorithm expressed as K+C/t, where K is a constant K factor, t is a function of T, and C is the single variable that is a function of the video format. The normalized value of the graticule beyond a point designated by flatBreak is a constant=K. Finally a linear curve fit between one and K+C/t over the range of +/−(T to 1.5T) sets the remaining values for the graticule.
Claims2
A method of generating a graticule for K2T measurement of a video signal comprising the steps of:
- setting the graticule to a normalized value of one for a first range from −T to +T, where T is a function of a video format for the video signal;
- setting the graticule to a normalized value determined by a human vision masking model algorithm for a third range from −1.5T to −flatBreak and +1.5T to +flatBreak, flatBreak being a point beyond which the graticule has a constant normalized value;
- and
- setting the graticule to a normalized value determined by a linear curve fit over a second range from −T to −1.5T and T to +1.5T between the first and third ranges.
Dependencies are inferred from the claim text.