Patent ID: 7505084

Claim:
A picture quality improvement device that receives as input a two-phase signal in which data of adjacent picture elements are distributed in order to different phases and then transmitted, and that, at a clock frequency of the two-phase signal, emphasizes edges within a video picture; said picture quality improvement device comprising: a first means for finding average values of data of the same order in data strings of each phase that have been received as input and generating an average value signal that takes the average values as its data string; a second means for performing a two-dimensional low-pass filter process upon said average value signal and eliminating components having higher frequency than a prescribed frequency; a third means for subtracting, from said data strings of each phase that have been received as input, the data string of said average value signal from which a high-frequency component has been eliminated and that has been generated by said second means, and for generating, for each phase, a signal in which the high-frequency component has been extracted; a fourth means for multiplying, by a prescribed factor, the signal in which the high-frequency component of each phase has been extracted and that has been generated by said third means; and a fifth means for adding, to said data strings of each phase that have been received as input, the data string of the signal in which the high-frequency component has been extracted for each phase and that has been multiplied by the prescribed factor by said fourth means.