Boots – shoes – and leggings
Patent
1992-02-26
1993-01-12
Mai, Tan V.
Boots, shoes, and leggings
G06F 1500
Patent
active
051795280
ABSTRACT:
A programmable PLT transfer function circuit (50) uses a piecewise linear transformation (PLT) to approximate a non-linear transfer function (FIGS. 1B and 1C). The non-linear transfer function is approximated by a selected number of linear PLT segment transfer functions, each of which applies to a selected range of input data values, and is characterized by a PLT transformation (mx+b) in which output data is obtained by multiplying the input data by a gain coefficient and then adding an offset coefficient. The gain and offset coefficients that characterize the PLT segment transfer functions are updated at regular intervals, and stored in the PLT transfer function circuit (50). For each input data sample, segment selection logic (52) selects the appropriate PLT segment. The input data sample is then referenced (61) to the segment breakpoint (i.e. the initial data value) for that segment. The referenced input data sample is then multiplied (62) by the appropriate gain coefficient provided by gain selection logic (56). The gain multiplication operation is a quasi-floating point operation performed by a funnel shifter (63) and a multiplier (64 ). An offset addition operation (66) then adds to the gain-multiplied input data sample the appropriate offset coefficient provided by offset coefficient selection logic (58), to complete the PLT transformation. The PLT transfer function approximation technique is described in connection with a range compression system for thermal imaging.
REFERENCES:
patent: 4621290 (1986-11-01), Fling
patent: 4747065 (1988-05-01), West
patent: 4785418 (1988-11-01), Pearce et al.
Box David O.
Mortland Glenn T.
Noeth Jon C.
Robertson James E.
Zumwalt Terry L.
Donaldson Richard L.
Grossman Rene E.
Mai Tan V.
Texas Instruments Incorporated
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