Videosystem for determining position of colored areas

Claim 1

Video system, particularly for digitalising of interpreted seismic sections, characterised in that said system comprises: A. a video camera (1) for formation of a set primary colour signals (R, G, B), and B. a signals processing unit (2), which comprises a) a Y-matrix (20) and comparators (21, 22) for formation of one or several difference signals (R-Y), G-Y), (B-Y) and a luminance signal (Y), b) comparators (23, 24) which compare the difference signals (R-Y), G-Y), (B-Y) with corresponding difference signals (R-Y s , (G-Y) s , (B-Y) s for a reference colour, and which are capable of providing a logic signal equal to 1 if the difference signals provided to the appropriate circuit are more or less of the same size, c) a comparator (25) which compares the luminance signal (Y) with a corresponding luminance signal (Y) s for a reference colour, and which is capable of providing a logic signal equal to 1 if the luminance signals (Y) and (Y) s are more or less of an equal size, d) a logic AND-gate (26) which is provided with the output signals from the comparators according to points b) and c), and which provides a logic signal (S) depending on the output signals from the comparators (23, 24, 25), e) two A/D-convertors (27, 28) which transform horizontal and vertical deflection signals (x and y) into corresponding digital signals, and, f) an output unit (29) which is controlled by the signal (S) from the logic AND-gate (26), and which is capable of providing signals (T x , T y ) based on the output signals from the A/D-converters (27, 28).