Patent ID: 6064447
Filing Date: 2000-05-16
Classification: H04N

Abstract:
A pure red color detection circuit comprising:slice means for inputting a color demodulated color-difference signal (R-Y) and for extracting an (R-Y) signal component at a slice level (Ls);absolute value means for inputting a color demodulated color-difference signal (B-Y) and for outputting an absolute value component of said inputted color-difference signal (B-Y);subtraction means for subtracting the absolute value component of the (B-Y) signal output from said absolute value means, from the (R-Y) signal at said slice level (Ls) and output from said slice means; andlimited means for removing a negative component of the signal output from said subtraction means and for outputting a red color component having an (R-Y) signal component in first and second quadrants.