Patent ID: 6278737
Filing Date: 2001-08-21
Classification: H04N

Abstract:
A reversible moving picture coding system, comprising:means for determining a motion vector from an interlaced scanned input video signal;means for producing a motion compensated predictive picture from a picture for reference using the motion vector;means for subtracting the motion compensated predictive picture from the input video signal to produce a predictive error picture;means for producing a frame-scanned block and a field-scanned block from the predictive error signal;means for estimating an error amount when reversible discrete cosine transform is performed for the frame-scanned block and then ordinary inverse discrete cosine transform is performed for the resultant block on the decoding side and outputting the estimated error amount as an estimated error amount for a frame-scanned block;means for estimating an error amount when reversible discrete cosine transform is performed for the field-scanned block and then ordinary inverse discrete cosine transform is performed for the resultant block on the decoding side and outputting the estimated error amount as an estimated error amount for a field-scanned block;means for comparing the estimated error amount for the frame-scanned block and the estimated error amount for the field-scanned block with each other to produce a scan selection signal and outputting the scan selection signal;means for selecting one of the frame-scanned block and the field-scanned block in accordance with the scan selection signal and outputting the selected scanned block as an adaptive-scanned block; andmeans for performing reversible discrete cosine transform for the adaptive-scanned block to produce an adaptive-scan transform coefficient block.