Jitter detection device and image quality correction device for adaptively changing correction when reproducing video signal
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorYukinobu Hamajima
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Abstract
A jitter detection device for detecting jitter of a video signal (Sv) measures a vertical period (Stf(v)) of one field (v) of the video signal (Sv) to determine, based on a vertical period signal (Stf(v)), whether the video signal (Sv) jitters or not. If the number of times (Cej) it is successively determined that the video signal (Sv) jitters is smaller than a first predetermined number of times (Tej), the video signal (Sv) is confirmed to be a jitter signal (Svj). If the number of times (Cnj) it is successively determined that the video signal (Sv) does not jitter is smaller than a second predetermined number of times (Cnj), the video signal (Sv) is confirmed to be a non-jitter signal (Svjn).
Claims18
A jitter detection device for detecting jitter in a video signal, said device comprising:
- a vertical period measuring means for measuring a vertical period for one field of the video signal and generating a vertical period signal;
- a jitter determination means for determining, based on the vertical period signal, whether the video signal jitters or not, and generating a jitter determination signal;
- a jitter determination counting means for counting, based on the jitter determination signal, the number of times it is successively determined that the video signal jitters, and generating a jitter determination counter signal;
- a jitter confirmation means for confirming, based on the jitter determination counter signal, that the video signal is a jitter signal if it is determined a first predetermined number of times that the video signal jitters;
- a non-jitter counting means for counting, based on the jitter determination signal, the number of times it is successively determined that the video signal does not jitter, and generating a non-jitter determination counter signal;
- a non-jitter confirmation means for confirming, based on the non-jitter determination counter signal, that the video signal is a non-jitter signal if it is determined a second predetermined number of times that the video signal does not jitter.
An image quality correction device for correcting quality of an image reproduced based on a video signal according to an amount of jitter in the video signal, said device comprising an image quality correction adjusting means that comprises at least one of:
- a noise reducing means for reducing noise of the video signal based on a predetermined correction amount of noise reduction;
- a horizontal edge enhancing means for enhancing a horizontal edge of the video signal based on a predetermined correction amount of horizontal edge enhancement;
- and
- a scan speed modulating means for enhancing a specific part of the video signal based on a predetermined amount of scan speed modulation;
- wherein, according to the amount of jitter, said image quality correction device increases the correction amount of noise reduction by a predetermined adjustment value, decreases the correction amount of horizontal edge enhancement by the adjustment value, and decreases the amount of scan speed modulation by the adjustment value.
A jitter detection device for detecting jitter in a video signal, said device comprising:
- a vertical period measuring unit operable to measure a vertical period for one field of the video signal and generate a vertical period signal;
- a jitter determination unit operable to determine, based on the vertical period signal, whether the video signal jitters or not, and generate a jitter determination signal;
- a jitter determination counter operable to count, based on the jitter determination signal, the number of times it is successively determined that the video signal jitters, and generate a jitter determination counter signal;
- a jitter confirmation unit operable to confirm, based on the jitter determination counter signal, that the video signal is a jitter signal if it is determined a first predetermined number of times that the video signal jitters;
- a non-jitter counting unit operable to count, based on the jitter determination signal, the number of times it is successively determined that the video signal does not jitter, and generate a non-jitter determination counter signal;
- a non-jitter confirmation unit operable to confirm, based on the non-jitter determination counter signal, that the video signal is a non-jitter signal if it is determined a second predetermined number of times that the video signal does not jitter.
An image quality correction device for correcting quality of an image reproduced based on a video signal according to an amount of jitter in the video signal, said device comprising an image quality correction adjuster that comprises at least one of:
- a noise reduction unit operable to reduce noise of the video signal based on a predetermined correction amount of noise reduction;
- a horizontal edge enhancer operable to enhance a horizontal edge of the video signal based on a predetermined correction amount of horizontal edge enhancement;
- and
- a scan speed modulator operable to enhance a specific part of the video signal based on a predetermined amount of scan speed modulation;
- wherein, according to the amount of jitter, said image quality correction device is operable to increase the correction amount of noise reduction by a predetermined adjustment value, decrease the correction amount of horizontal edge enhancement by the adjustment value, and decrease the amount of scan speed modulation by the adjustment value.
Dependencies are inferred from the claim text.