Image encoding apparatus, picture encoding method and image editing apparatus
An image coding and picture technology, which is applied in image communication, record carrier editing, electronic editing of digital analog information signals, etc., can solve the problems of inability to refer to picture complexity, image deterioration, etc., to prevent image quality from deteriorating, and suppress image quality. The effect of deterioration in quality
Inactive Publication Date: 2007-04-11
RENESAS ELECTRONICS CORP
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Problems solved by technology
In this case, pictures that were originally coded as B-pictures are re-coded as I-pictures, which causes image degradation after editing
Also, since the picture phase of the edited stream does not correspond to the picture phase of the codestream pre-analyzed in the first pass, the picture complexity after this edit point cannot be referred to and therefore two-pass encoding cannot be performed on the edited stream
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[0038] The invention will be described with reference to illustrative embodiments. Those skilled in the art will recognize that many alternative embodiments can be accomplished using the teachings of the present invention and that the invention is not limited to the embodiments illustrated for purposes of illustration only.
[0039] Specific embodiments of the invention are described herein with reference to the accompanying drawings. In the embodiments described below, the present invention is applied to a moving image encoding device having an editing function using two-pass encoding.
[0040] The image encoding device according to the present embodiment provides two-pass encoding. The two-pass encoding process first estimates the amount of data after compression-encoding by preliminarily compressing-encoding non-compressed audio / video data in the first pass. Then, in the second pass, the process adjusts the data compression ratio according to the estimated data amount and...
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An image encoding apparatus includes an editor for editing a coded stream encoded from non-compressed video data such that two edit points (A and B) are arranged in succession, a decoding processor for decoding an edited stream, and an encoding processor for encoding the edited coded stream. The encoding processor receives edited decoded data and inserts an insertion picture encoded from a decoded image J immediately previous to the point A between the points A and B, thereby creating the edited coded stream by aligning picture phases in such a way that a picture type is the same in the same frame between the original coded stream and the edited coded stream.
Description
technical field [0001] The present invention relates to an image encoding device, an image encoding method, and an image editing device capable of editing, decoding, and re-encoding a code stream encoded from non-compressed video data. Background technique [0002] With the recent development of digital technology, digital sound / image recording and playback devices such as HDD (Hard Disk Drive), DVD (Digital Versatile Disc) and DVD players have been put into practical use. These digital systems compress image data into a stream using the MPEG (Moving Picture Experts Group) standard. [0003] In the MPEG-2 (ISO / IEC13818-2) standard, the coded stream (coded stream) is formed by the combination of three kinds of pictures: intra-coded picture (I-picture); predictive coded picture (P-picture), which is from the reference A frame is a picture encoded using unidirectional prediction; and a bidirectionally predictively coded picture (B-picture), which is a picture encoded using bid...
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IPC IPC(8): H04N7/32H04N7/26H04N5/926H04N19/103H04N5/91H04N5/92H04N19/115H04N19/134H04N19/136H04N19/14H04N19/159H04N19/189H04N19/194H04N19/196H04N19/40H04N19/50H04N19/503H04N19/577
CPCH04N5/781H04N21/234354G11B27/322H04N5/85H04N9/8042H04N21/44008G11B27/036H04N9/8205H04N5/91H04N19/40
Inventor 奥山智之
Owner RENESAS ELECTRONICS CORP