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US 7,936,817 B2Granted
High-efficiency encoder and video information recording/reproducing apparatus
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsTomohiro Ueda, Takashi Itow, Yoshinori Asamura, Ken Onishi, Hidetoshi Mishima
Life of this patent
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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.
Claims8
A video encoder comprising:
- an intra-mode encoding unit for performing a block-based intra-mode encoding for at least a first portion of a video signal, said intra-mode encoding unit performing field based intra-mode encoding or frame based intra-mode encoding for the first portion of the video signal in a field-based signal or a frame-based signal, thereby producing an intra-field or an intra-frame;
- a predictive-mode encoding unit for performing a block-based predictive-mode encoding for at least a second portion of the video signal, said predictive-mode encoding unit performing frame based predictive-mode encoding or field based predictive-mode encoding for the second portion of the video signal in a field-based signal or a frame-based signal, thereby producing a predictive-field or a predictive-frame;
- and
- a selection unit for selecting a reference field or a reference frame used for performing predictive-mode encoding, said selection unit selecting said intra-field or said predictive-field as said reference field when said predictive-mode encoding unit performs field based predictive-mode encoding, said selection unit selecting said intra-frame or said predictive-frame as said reference frame when said predictive-mode encoding unit performs frame based predictive-mode encoding;
- wherein said predictive-field or said predictive-frame may contain an intra-block that has been encoded by the intra-mode encoding, and said intra-mode encoding unit generates a predetermined signal for each intra-block within said predictive-field or said predictive-frame.
2 more elements
A video encoding method comprising:
- performing a block-based intra-mode encoding for at least a first portion of the video signal, said intra-mode encoding unit performing field based intra-mode encoding or frame based intra-mode encoding for the first portion of the video signal in a field-based signal or a frame-based signal, thereby producing an intra-field or an intra-frame;
- performing a block-based predictive-mode encoding for at least a second portion of the video signal, said predictive-mode encoding unit performing frame based predictive-mode encoding or field based predictive-mode encoding for the second portion of the video signal in a field-based signal or a frame-based signal, thereby producing a predictive-field or a predictive-frame;
- and
- selecting a reference field or a reference frame used for performing predictive-mode encoding, said intra-field or said predictive-field for said reference field when said predictive-mode encoding unit performs field based predictive-mode encoding and selects either the intra-frame or the predictive-frame for said reference frame when said predictive-mode encoding unit performs frame based predictive-mode encoding;
- wherein said predictive-field or said predictive-frame may contain an intra-block that has been encoded by the intra-mode encoding, and a predetermined signal is generated for each intra-block within said predictive-field or said predictive-frame.
2 more elements
Dependencies are inferred from the claim text.