| 摘要 |
A method for automatic control of non-linear image processing of a television signal subjected to degradation upon passage through a quality degrading medium is disclosed. The processing is of the type including at least one of image enhancement, and noise, ringing and interference reduction within the television signal. The method includes the steps of: a. generating a pilot signal having an amplitude and frequency selected to be representative of video transitions most susceptible to degradation during passage through the medium; b. adding the pilot signal to the television signal prior to its passage through the degrading medium and before any prepassage signal processing takes place; c. passing the television signal through the degrading medium; d. enhancing the television signal with image enhancement processing following its passage through the degrading medium and performing the additional steps of: (1) recovering the pilot signal; (2) converting the recovered pilot signal to an automatic adjustment control signal which is related to the amplitude of the recovered bursts; (3) automatically controlling the adjustments of the image enhancement processing with the automatic adjustment control signal; and preferably, although not necessarily, (4) removing the pilot signal bursts from the enhanced television signal upon completion of the image enhancement processing.
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