REAL-TIME, LOCALIZED ENHANCEMENT OF A VIDEO IMAGE USING SEPARABLE TWO-DIMENSIONAL FILTERS

摘要

REAL-TIME, LOCALIZED ENHANCEMENT OF A VIDEO IMAGEUSING SEPARABLE TWO-DIMENSIONAL FILTERSABSTRACT OF THE DISCLOSUREA video signal producing a raster-scanned image isprocessed in real time to enhance high frequencycharacteristics of the image generated by the signal, withthe enhancement performed according to a local adaptiveprocess implemented in an apparatus including one or moretwo-dimensional higher-order filters. Each filter providesa signal corresponding to a statistical measure of theraster image at a point in the image centered in a localarea. In each case, the measure is a function ofcharacteristics of the image within the centered area. Eachfilter is synchronized with the video signal to provide itsrespective statistical signal substantially in real time andin phase with the input video signal.