Patent ID: 6807365
Filing Date: 2004-10-19
Classification: G06T,G11B

Abstract:
A video data recording and reproducing apparatus comprising:data compression means for compressing video data; first modification detection data generation means for generating first modification detection data in accordance with said compressed video data; combining means for combining said video data with said first modification detection data to output combined data; recording means for recording said combined data on a recording medium; reading means for reading said combined data from said recording medium; separating means for separating said combined data from said reading means into said compressed video data and said first modification detection data; second modification detection data generation means for generating second modification detection data in accordance with said compressed data from said separating means; comparing means for comparing said data modification detection data from said separating means with said second data modification detection data; data expansion means for expanding said compressed video data from said separating means to output expanded video data; and outputting control means for controlling outputting said expanded video data in accordance with said result of said comparing means.