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US 7,756,202 B2Granted
High-efficiency encoder and video information recording/reproducing apparatus
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsTomohiro Ueda, Takashi Itow, Yoshinori Asamura, Ken Onishi, Hidetoshi Mishima
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Abstract
In a high-efficiency encoder which performs motion-compensation prediction, an intra-field is set every n fields. The presence of a scene change is detected. When a scene change occurs, a reference picture of motion-compensation prediction is switched, or the field immediately after the scene change is set as an intra-field.
Claims9
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.
18 more elements
A conversion method variable-length encoded data by decoding process, said variable-length encoded data being encoded by performing a block-based intra-mode encoding for at least a first portion of a video signal, thereby producing an intra-field or an intra-frame;
- and performing a block-based predictive-mode encoding for at least a second portion of the video signal, thereby producing a predictive-field on a predictive-frame;
- wherein said predictive-field or said predictive-frame may include an intra-block that has been encoded by the intra-mode encoding and each intra-block within said predictive-field or said predictive-frame is identified by a predetermined signal;
- said method comprising:
- decoding said intra-field or said intra-frame by performing block based intra-mode decoding, thereby producing a first field or a first frame which corresponds to said first portion of the video signal;
- and
- decoding said predictive-field or said predictive-frame by performing block based predictive-mode decoding based on said first field or said first frame, thereby producing a second field or a second frame which corresponds to said second portion of the video signal;
- wherein said block based intra-mode decoding is performed to produce said second field or said second frame when said predictive-field or said predictive-frame contains said intra-block.
4 more elements
Dependencies are inferred from the claim text.