Apparatus for enhancing image quality of a videotape recorder using motion adaptive method

A motion adaptive frequency unfolding apparatus, comprising:

• means for receiving a luminance signal representative of a brightness level of a picture image having a restricted bandwidth and comprising high frequency components and low frequency components, said high frequency components being folded over said low frequency components to establish said restricted bandwidth;
• delay means for delaying said luminance signal for a delay period to provide a delayed luminance signal;
• unfolding means coupled to receive said luminance signal, for unfolding the high frequency components from the low frequency components of said luminance signal to provide an unfolded luminance signal;
• and
• means for selectively enabling transmission of said delayed luminance signal and said unfolded luminance signal in dependence upon a motion coefficient indicative of motion from said picture image.

A motion adaptive frequency unfolding method, comprising the steps of:

• receiving a luminance signal representative of the brightness level of a picture image having a restricted bandwidth and comprising high frequency components and low frequency components, said high frequency components being folded over said low frequency components to establish said restricted bandwidth;
• delaying said luminance signal for a delay period to provide a delayed luminance signal;
• unfolding the high frequency components from the low frequency components of said luminance signal to provide an unfolded luminance signal;
• and
• enabling selective transmission of said delayed luminance signal and said unfolded luminance signal in dependence upon a motion coefficient indicative of motion from said picture image.

A motion adaptive frequency unfolding apparatus, comprising:

• means for receiving folded luminance signals having high-frequency components and low-frequency components, the high-frequency components being folded over the low-frequency components within a restricted bandwidth by a frequency folding process;
• means for detecting a motion coefficient corresponding to a motion signal from said folded luminance signals, said motion signal being indicative of motion of an image;
• unfolding means coupled to receive said folded luminance signals, for generating unfolded luminance signals by unfolding the high frequency components from the low frequency components of said folded luminance signals;
• means for delaying said folded luminance signals for a delay period to provide delayed luminance signals;
• means for enabling transmission of said delayed luminance signal and said unfolded luminance signal in dependence upon said motion coefficient.

A motion adaptive frequency unfolding method, comprising the steps of:

• receiving folded luminance signals having high-frequency components and low-frequency components, the high-frequency components being folded over the low-frequency components;
• detecting a motion coefficient corresponding to a motion signal from said folded luminance signals, said motion signal being indicative of motion of an image;
• generating unfolded luminance signals by unfolding the high frequency components from the low frequency components of said folded luminance signals;
• delaying said folded luminance signals for a delay period to provide delayed luminance signals;
• generating first attenuated luminance signals upon attenuation of magnitudes of said unfolded luminance signals in dependence upon said motion coefficient;
• generating second attenuated luminance signals upon attenuation of magnitudes of said delayed luminance signals in dependence upon said motion coefficient;
• and
• generating output luminance signals in dependence upon said first and second attenuated luminance signals.

A motion adaptive frequency unfolding apparatus, comprising:

• means for detecting a motion coefficient from folded luminance signals having high-frequency components and low-frequency components, the high-frequency components being folded over the low-frequency components with a restricted bandwidth, said motion coefficient being indicative of motion of an image;
• means for generating unfolded luminance signals by unfolding the high frequency components from the low frequency components of said folded luminance signals;
• means for delaying said folded luminance signals for a delay period to provide delayed luminance signals;
• means for generating first and second attenuated luminance signals upon attenuation of magnitudes of said unfolded luminance signals and said delayed luminance signals in dependence upon said motion coefficient;
• and
• means for generating output luminance signals in dependence upon said first and second attenuated luminance signals.