Apparatus and method for processing video signal
View Patent ↗An amplitude discrimination circuit separates a received video signal into a signal component with a minute amplitude level and other signal component with a high amplitude level. A contour correction circuit performs contour correction processing on a signal with the high amplitude level and a nonlinear processing circuit performs nonlinear processing after adding the signal with high amplitude level to an output from a delay circuit which delays the received video signal by the time required for the contour correction processing performed by the contour correction circuit. A minute amplitude contour correction circuit performs contour correction processing on the signal with the minute amplitude level and an adder circuit adds the signal with the minute amplitude level to an output from the nonlinear processing circuit after delaying the signal with the minute amplitude level by the time required for the nonlinear processing performed by a delay circuit.
1. An apparatus for processing a video signal, comprising:
a receiving unit which receives a broadcast signal;
a recovery processing unit which recovers a video signal from the broadcast signal received by the receiving unit;
a first contour correction unit which performs contour correction processing on the video signal recovered by the recovery processing unit;
a first delay unit which delays the video signal recovered by the recovery processing unit by the time required for the contour correction processing performed by the first contour correction unit;
a first adder unit which adds an output signal from the first delay unit to an output signal from the first contour correction unit;
a nonlinear processing unit which performs nonlinear processing on an output signal from the first adder unit;
a separation unit which separates a signal component with not more than a prescribed amplitude level from a contour component of the video signal recovered by the recovery processing unit;
a second contour correction unit which performs contour correction processing on a signal with not more than the prescribed amplitude level separated by the separation unit;
a second delay unit which delays an output signal from the second contour correction unit by the time required for the nonlinear processing performed by the nonlinear processing unit; and
a second adder unit which adds an output signal from the second delay unit to an output signal from the nonlinear processing unit.
2. The apparatus for processing the video signal according to claim 1 , further comprising a video display unit which makes a video display on the basis of an output signal from the second adder unit.
3. The apparatus for processing the video signal according to claim 1 , further comprising an output unit which outputs an output signal from the second adder unit.
4. An apparatus for processing a video signal, comprising:
a receiving unit which receives a video signal;
a first contour correction unit which performs contour correction processing on the video signal received by the receiving unit;
a first delay unit which delays the video signal received by the receiving unit by the time required for the contour correction processing performed by the first contour correction unit;
a first adder unit which adds an output signal from the first delay unit to an output signal from the first contour correction unit;
a nonlinear processing unit which performs nonlinear processing on an output signal from the first adder unit;
a separation unit which separates a signal component not more than a prescribed amplitude level from the contour component of the video signal received by the receiving unit;
a second contour correction unit which performs contour correction processing on a signal with not more than the prescribed amplitude level separated by the separation unit;
a second delay unit which delays an output signal from the second contour correction unit by the time required for the nonlinear processing performed by the nonlinear processing unit; and
a second adder unit which adds an output signal from the second delay unit to an output signal from the nonlinear processing unit.
5. The apparatus for processing the video signal according to claim 4 , further comprising a video display unit which makes a video display on the basis of an output signal from the second adder unit.
6. The apparatus for processing the video signal according to claim 4 , further comprising an output unit which outputs an output signal from the second adder unit.
7. The apparatus for processing the video signal according to any one of claims 1 - 6 , wherein the separation unit separates a signal component with a minute amplitude level from the contour component of the video signal.
8. A method for processing a video signal, comprising:
a first step of receiving a video signal;
a second step of performing contour correction processing to the video signal;
a third step of delaying the video signal by the time required for the contour correction processing in the second step;
a fourth step of adding an output signal from the third step and an output signal from the second step;
a fifth step of performing nonlinear processing on an output signal from the fourth step;
a sixth step of separating a signal component with not more than a prescribed amplitude level from a contour component of the video signal;
a seventh step of performing contour correction processing on a signal with not more than the prescribed amplitude level separated in the sixth step;
an eighth step of delaying an output signal from the seventh step by the time required for the nonlinear processing in the fifth step; and
a ninth step of adding an output signal from the eighth step to the output signal from the seventh step.
9. The method for processing a video signal according to claim 8 , further comprising a tenth step of making a video display on the basis of an output signal from the ninth step.
10. The method for processing a video signal according to claim 8 , further comprising a tenth step of outputting an output signal from the ninth step.
11. The method for processing a video signal according to claim 8 , wherein the first step comprises:
receiving a broadcast signal including a video signal, instead of receiving the video signal;
recovering the video signal from the received broadcast signal; and
passing the recovered video signal to the second step for the contour correction processing.
12. The method for processing a video signal according to claim 11 , further comprising a tenth step of making a video display on the basis of an output signal from the ninth step.
13. The method for processing a video signal according to claim 11 , further comprising a tenth step of outputting an output signal from the ninth step.
14. The method for processing the video signal according to any one of claims 8 - 13 , wherein the step of separating the signal component with not more than the prescribed amplitude level from the contour component of the video signal is a step of separating a signal component with a minute amplitude level from the contour component of the video signal.