Patent ID: 7324157

Claim:
A repeat field detecting apparatus which is used in a video progressive conversion reproducing apparatus of converting a video input signal of interlace scheme into a video signal of progressive scheme and which detects whether said video input signal is a repeat field where the same video image is outputted repeatedly or an ordinary field which is other than said repeat field, said repeat field detecting apparatus comprising: a first RF determining means of identifying a repeat field having a predetermined distance from said video input signal, on the basis of a discrepancy pixel number which is the number of the pixels having discrepancy between the pixel information of a field of said video input signal and the pixel information of a field of said video input signal having a predetermined distance from the former-mentioned field of the video input signal; M/N ratio calculating means of obtaining an N component which is the number of discrepancy pixels between repeat fields and an M component which is the number of discrepancy pixels between at least a pair of fields which are other than said repeat fields and have said predetermined distance from each other, and then calculating an M/N ratio which is the ratio of said M component to said N component; RF determination reliability calculating means of outputting the reliability of the determination result of said first RF determining means on the basis of the output of said M/N ratio calculating means; and M/N ratio adaptive repeat field confirming means of confirming the output of said first RF determining means as the determination result on the basis of said reliability outputted from said RF determination reliability calculating means.