Patent ID: 7430019
Filing Date: 2008-09-30
Classification: H04N

Abstract:
1. An apparatus to improve an image sharpness, comprising: a plurality of band pass filters to respectively extract preset different frequency bands from a first video signal converted and inputted from an input video signal according to a video format of a display device; a filter selection part to select and operate at least one of the plurality of band pass filters to output video signals; at least one first differentiator to differentiate the video signals outputted from the selected band pass filters; at least one second differentiator to second-differentiate the differentiated video signals outputted from the first differentiators; at least one amplifier to amplify the second-differentiated video signals of the at least one second differentiator with according to a preset amplification factor, and to output a second video signal; an adder to invert the second video signal, and to add the inverted second video signal to the first video signal to output an added video signal as an output video signal; a storage part to store a selection list to select the at least one of the plurality of band pass filters according to information on the input video signal and the output video signal such that the information comprises a resolution of each signal; and a controller which utilizes the selection list of the storage part to control the filter selection part regarding which at least one of the plurality of band pass filters should be selected for the input video signal.