초록 ▼

A video signal producing a raster-scanned image is processed in real time to enhance high frequency characteristics of the image generated by the signal, with the enhancement performed according to a local adaptive process implemented in an apparatus including one or more two-dimensional higher-orde

A video signal producing a raster-scanned image is processed in real time to enhance high frequency characteristics of the image generated by the signal, with the enhancement performed according to a local adaptive process implemented in an apparatus including one or more two-dimensional higher-order filters. Each filter provides a signal corresponding to a statistical measure of the raster image at a point in the image centered in a local area. In each case, the measure is a function of characteristics of the image within the centered area. Each filter is synchronized with the video signal to provide its respective statistical signal substantially in real time and in phase with the input video signal.

대표청구항 ▼

A video processing apparatus for enhancing presentation characteristics of a raster-scanned image signal, comprising: processing means responsive to an input signal representative of a raster-scanned image and to a statistical signal representative of a statistical value of said input signal for com

A video processing apparatus for enhancing presentation characteristics of a raster-scanned image signal, comprising: processing means responsive to an input signal representative of a raster-scanned image and to a statistical signal representative of a statistical value of said input signal for combining said input signal and said statistical signal to produce an output signal representing an enhancement of said raster-scanned image by increasing the contrast in the image; plural-order filter means responsive to said input signal and to a filter variable signal for producing said statistical signal during a first image raster field defined by said input signal, said statistical signal produced by two-dimensional filtration of said input signal within a horizontal filter bandwidth and a vertical filter bandwidth, at least one of said filter bandwidths being determined by said filter variable signal; and phase adjustment means coupled between said processing means and said plural-order filter means for adjusting the phase of said statistical signal to substantially equal the phase of said input signal by producing said filter variable signal based upon two-dimensional filtration of a second image raster field defined by said input signal, said second image raster field corresponding to, but preceding, said first image raster field.