Patent ID: 7106379

Claim:
A scan conversion apparatus comprising: a video signal discriminating circuit for discriminating kinds of input video signals based on an interlaced scanning system; a telecine video scan conversion circuit for converting said input video signal into a video signal based on a progressive scanning system by processing suited for telecine video signal; a scan conversion circuit for converting said input video signal into a video signal based on a progressive scanning system by processing suited for signals other than telecine video signal; and a first selector which selects and delivers output from said telecine scan conversion circuit and output from said scan conversion circuit in accordance with result of discrimination executed by said video signal discriminating circuit, wherein said video signal discriminating circuit comprises: a telecine detection circuit which outputs telecine pattern number and discrimination signal showing whether the input video signal is a telecine signal or not; an interfield difference detection circuit which outputs Flag related to the level of coincidence between fields of said input video signal according to the telecine pattern number; and a first AND circuit which obtains an output from said video signal discriminating circuit by calculating the logical product of the discrimination signal and the Flag, wherein said telecine scan conversion circuit converts the input video signal into a video signal based on a progressive scanning system in accordance with the telecine pattern number.