Patent ID: 7756202

Claim:
A conversion method comprising: encoding by using an intra-mode at least one field of a video signal to be inputted on a field basis and storing the encoded field of the video signal as a reference picture; and encoding the other fields of the video signal by using a predictive encoding mode with a motion compensation prediction with respect to the reference picture; wherein the encoding step using the intra-mode or the predictive encoding mode include a variable length encoding process, the method for transforming data further comprising steps of: adding data to the video signal, encoded with the intra-mode or the predictive encoding mode, that is to be ignored during decoding, and dividing and embedding the signal into a plurality of segments having fixed lengths; and adding an error correcting code, wherein the number of the segments is variable to which the video signal encoded by the intra-mode and the predictive encoding mode is embedded, wherein a size of a prediction block for motion detection in the predictive encoding mode and a size of an orthogonal transform block in the intra-mode are equal; and wherein the encoding comprises: performing a block-based intra-mode transformation of at least a first portion of the video signal by an intra-mode transforming unit; and performing a block-based predictive-mode transformation of at least a second portion of the video signal by a predictive-mode transforming unit, said intra-mode transforming unit performing the intra-mode transformation on the basis of fields of the at least first portion of the video signal in a field-based video signal, said intra-mode transforming unit performing the intra-mode transformation on the basis of frames of the at least first portion of the video signal in a frame-based video signal, said predictive-mode transforming unit performing the predictive-mode transformation on the basis of fields of at least the second portion of the video signal in the field-based video signal, and said predictive-mode transforming unit performing the predictive-mode transformation on the basis of frames of at least the second portion of the video signal in the frame-based video signal, wherein an intra-block, coded using intra-mode transformation, may be included within a predictive field or predictive frame, and said video signal contains an intra-mode signal for said intra-block, said intra-mode signal being generated for each intra-block within said predictive-fields or a predictive-frame that has been transformed by using the intra-mode transformation.