FIELD: information technology.
SUBSTANCE: invention relates to means of extracting information from detected characteristic signals. Data stream (26) derivable from electromagnetic radiation (14) emitted or reflected by object (12) is received. Data stream (26) comprises continuous or discrete time-based characteristic signal (p; 98) comprising at least two main components (92a, 92b, 92c) related to respective complementary channels (90a, 90b, 90c) of signal space (88). Characteristic signal (p; 98) is mapped to a defined component representation (b, h, s, c; T, c) under consideration of a substantially linear algebraic signal composition model so as to specify a linear algebraic equation. Linear algebraic equation is at least partially solved under consideration of an at least approximate estimation of specified signal portions (b, h, s). Consequently, an expression highly indicative of at least one at least partially periodic vital signal (20) can be derived from linear algebraic equation.
EFFECT: technical result is improving accuracy of extracting information.
15 cl, 6 dwg
