Invention Grant
US08111332B2 Noise suppression method, noise suppression method program, recording medium recording noise suppression method program, and noise suppression apparatus 有权
噪声抑制方法,噪声抑制方法程序,记录介质记录噪声抑制方法程序和噪声抑制装置

Noise suppression method, noise suppression method program, recording medium recording noise suppression method program, and noise suppression apparatus
Abstract:
An apparatus for suppressing noise of a video signal. The apparatus includes: a difference-signal generation section generating a difference signal being a field or frame difference between the input and the output video signals; a noise compensation-signal generation section generating a noise compensation signal; a noise-compensation signal subtraction section; and a feedback-ratio control section, wherein the feedback-ratio control section includes a signal-level determination section determining a signal level of the difference signal for each area and detecting an abrupt change in an input signal, a count section counting the number of input fields or frames from the time of an abrupt change in a signal level to the subsequent abrupt change, and a feedback-ratio setting section setting a feedback ratio for the area in accordance with a count value, wherein the feedback-ratio setting section sets the feedback ratio such that the ratio gradually increases as the count value increases.
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