| 摘要 |
A SIGNAL Y OUTPUTTED FROM A Y/C SEPARATING CIRCUIT (14) IS SUPPLIED TO FIRST AND SECOND MATRICES (17, 18). SIGNALS R-Y AND B-Y ARE SUPPLIED TO THE FIRST MATRIX (17) THROUGH A GAIN CONTROL AMPLIFIER (GCA) (16) AND ARE ALSO SUPPLIED TO THE SECOND MATRIX (18). THE SIGNALS Y, R-Y, AND B-Y ARE CONVERTED INTO THREE PRIMARY COLOR SIGNALS R, G, AND B BY THE SECOND MATRIX (18). FROM THE SIGNALS R, G, AND B, A SKIN COLOR COMPONENT IS DETECTED BY A SKIN COLOR DETECTING CIRCUIT (19) AND ESKIN IS OUTPUTTED. ON THE BASIS OF ESKIN COLOR COMPONENTS OTHER THAN THE SKIN COLOR ARE DETECTED BY A COLOR COMPONENT DETECTING CIRCUIT (20) AND EOTHER - ESKIN IS SUPPLIED AS A CONTROL VOLTAGE TO THE GCA (16). GAINS FOR THE SIGNALS R-Y AND B-Y ARE CONTROLLED. WHEN THE VIDEO SIGNAL INDICATES THE SKIN COLOR COMPONENT, THE CONTROL VOLTAGE IS SET TO 0 AND THE GAIN IS SET TO 1. WHEN THE VIDEO SIGNAL INDICATES A COLOR COMPONENT OTHER THAN THE SKIN COLOR COMPONENT, EOTHER IS GENERATED, THE CONTROL VOLTAGE RISES, AND THE GAIN IS INCREASED. THE COLORS OTHER THAN THE SKIN COLOR ARE EMPHASIZED AND THE COLOR CONTRAST IS MORE NATURALLY ENHANCED.(FIG. 1A & 1B) |
