Video signal processing method and device
First Claim
1. A video-signal processing method comprising the steps of:
- converting the number of scanning lines of a video signal,emphasizing a high-frequency component at least in a vertical direction of the video signal converted in said number-of-scanning-line conversion step,obtaining a delay signal delayed by a plurality of stages of time equal to or more than a time required for converting in said number-of-scanning-line conversion step,selecting an appropriate delay signal from among the plurality of delay signals obtained in said delay step,detecting an overemphasized component by comparing the delay signal selected in said selection step with the video signal emphasized in said emphasis step, andsuppressing the emphasis with respect to a portion where the overemphasized signal component is detected in said detection step.
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Abstract
To enable a satisfactory suppression of overemphasized component after converting the number of scanning lines of video signal, when the video signal is converted in the number of scanning lines and a high-frequency component at least in a vertical direction of the converted video signal is emphasized, signals delayed by a plurality of stages of time equal to or more than a time required for converting the number of scanning lines are obtained by a delay circuit 18, and an appropriate delay signal is selected from among the plurality of delay signals by a selection circuit 19. The selected delay signal is compared with the emphasized video signal in emphasized-component detector circuits 16a, 16b and the overemphasized component is detected. Processing to suppress the emphasis is performed by suppressor circuits 13a, 13b with respect to a portion where the overemphasized signal component is detected.
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Citations
10 Claims
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1. A video-signal processing method comprising the steps of:
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converting the number of scanning lines of a video signal, emphasizing a high-frequency component at least in a vertical direction of the video signal converted in said number-of-scanning-line conversion step, obtaining a delay signal delayed by a plurality of stages of time equal to or more than a time required for converting in said number-of-scanning-line conversion step, selecting an appropriate delay signal from among the plurality of delay signals obtained in said delay step, detecting an overemphasized component by comparing the delay signal selected in said selection step with the video signal emphasized in said emphasis step, and suppressing the emphasis with respect to a portion where the overemphasized signal component is detected in said detection step. - View Dependent Claims (2, 3, 4, 5)
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6. A video-signal processing apparatus comprising
a number-of-scanning-line conversion means for converting the number of scanning lines of a video signal, an emphasis means for emphasizing a high-frequency component at least in a vertical direction of the video signal converted by said number-of-scanning-line conversion means, a delay means for obtaining signals delayed by a plurality of stages of time equal to or more than a time required for converting in said number-of-scanning-line conversion means, a selection means for selecting an appropriate delay signal from among the plurality of delay signals obtained by said delay means, a detector means for detecting an overemphasized component by comparing the delay signal selected by said selection means with the video signal emphasized by said emphasis means, and a suppression means for suppressing the emphasis with respect to a portion where the overemphasized-signal component is detected by said detection means.
Specification