Signal processing system having vertical/horizontal contour compensation and frequency bandwidth extension functions

A high frequency image signal processing system, comprising:

• means for receiving a luminance signal and a chrominance signal;
• luminance processor means for reducing a transition time of frequency components of said luminance signal and extending a frequency bandwidth of said luminance signal, for compensating horizontal contours of said luminance signal, and for controlling gray levels of said luminance signal by amplifying low level components of said luminance signal, to thereby produce a processed luminance signal;
• and
• chrominance processor means for gain controlling and demodulating said chrominance signal to produce demodulated chrominance signals, and for controlling tint components of said demodulated chrominance signals, reducing transition time of frequency components of said demodulated chrominance signals and extending a frequency bandwidth of said demodulated chrominance signals, to thereby produce a processed chrominance signal.

A method for processing image signal, comprising the steps of:

• receiving a luminance signal and a chrominance signal;
• reducing transition time of high frequency components of said luminance signal and extending a frequency bandwidth of said luminance signal to provide a luminance crispened signal;
• compensating horizontal contours of said luminance signal to provide a horizontal compensated signal;
• controlling gray gain values of said luminance signal to provide a gray controlled signal;
• mixing said luminance crispened signal, said horizontal compensated signal, said gray controlled signal and said luminance signal to provide a processed luminance signal;
• gain controlling and demodulating said chrominance signal to provide demodulated chrominance signals respectively representative of a red-chrominance signal and a blue-chrominance signal;
• varying phases of said demodulated chrominance signals to determine correct coloring of said demodulated chrominance signal for providing first and second tint controlled signals;
• reducing transition time of high frequency components of said first and second tint controlled signals and extending a frequency bandwidth of said first and second tint controlled signals to provide first and second chrominance crispened signals;
• and
• multiplexing said first and second chrominance crispened signals to provide a processed chrominance signal.

A method for processing image signal, comprising the steps of:

• receiving video signals comprising luminance and chrominance components;
• reducing transition time of the luminance components of said video signals to produce luminance crispened signals;
• compensating horizontal contours of the luminance components of said video signals to provide contour-compensated luminance component signals;
• controlling gain of gray levels of the luminance components of said video signals to provide gray-controlled luminance component video signals;
• controlling magnitudes of the chrominance components of said video signals and demodulating the chrominance components of said video signals to provide demodulated chrominance signals;
• controlling tint components of said demodulated chrominance signals to produce tint-controlled chrominance components signals;
• reducing transition time of the tint-controlled chrominance components signals to produce chrominance crispened signals;
• generating processed luminance signals in dependence upon said luminance crispened signals, said contour-compensated luminance component signals, said gray-controlled luminance component signals and said luminance signals;
• and
• generating processed chrominance signals in dependence upon said chrominance crispened signals.

A signal processing system, comprising:

• means for receiving video signals representative of luminance and chrominance signals;
• luminance processor means for processing said luminance signals by reducing transition time of frequency components of said luminance signals, compensating horizontal contours of said luminance signals and controlling gray levels of said luminance signals to produce processed luminance signals;
• and
• chrominance processor means for processing said chrominance signals to produce processed chrominance signals, said chrominance processor means comprising:
• first means for controlling magnitudes and demodulating said chrominance signals to produce demodulated chrominance signals;
• and
• second means for controlling tint components of said demodulated chrominance signals, and for reducing transition time of said demodulated chrominance signals, thereby enabling production of said processed chrominance signals.

A method for processing high frequency image signals, comprising the steps of:

• receiving luminance and chrominance signals;
• generating processed luminance signals by reducing transition time of frequency components of said luminance signals, compensating horizontal contours of said luminance signals, and controlling gray levels of said luminance signal;
• and
• generating processed chrominance signals by gain controlling and demodulating said chrominance signals to provide demodulated chrominance signals, and by controlling tint components and reducing transition time of frequency components of the demodulated chrominance signals.