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Code converter and cod convertion method

A transcoder and macroblock technology, applied in the field of motion vector determination, can solve problems such as application limitations of conventional transcoders, transcoders that are not suitable for supporting various solutions, and cannot consider conversion of non-integer multiples, etc.

Inactive Publication Date: 2003-07-16
SAMSUNG ELECTRONICS CO LTD
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  • Abstract
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Problems solved by technology

[0008] However, conventional transcoders only support scaling in multiples of 2N or integer multiples to reuse motion vectors from the input bitstream
Therefore, since the conventional code converter shown in FIG. 2 cannot consider the conversion of non-integer multiples, there is a disadvantage that the conventional code converter is not suitable for the application of code converters supporting various solutions.
In addition, as shown in Figure 3, the conventional code converter only considers the motion vector in motion estimation to reduce the complexity of calculation, but cannot consider the calculation requirements for determining the macroblock mode, so the application of the conventional code converter is limited

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Embodiment Construction

[0035] The embodiments of the present invention shown in the drawings will now be described in detail, in which all the same reference numerals indicate the same components.

[0036] In the present invention, using the correlation between adjacent frames (fields), motion estimation obtains the pixel data difference between adjacent frames (fields). That is, by comparing the current frame with the previous frame, the macro block of the previous frame corresponding to the predetermined macro block of the current frame is searched, the motion vector of the macro block of the previous frame searched is detected, and the macro block of the next frame is estimated based on these detected motion vectors. Block motion, motion estimation estimates the motion of the macroblock in the next frame. The reference frame used here refers to the previous frame compared with the current frame.

[0037] Referring now to FIG. 3, the original resolution reference frame 150 has some related non-scaled ...

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Abstract

A transcoder and a method of transcoding which reduces computational requirements without picture deterioration. A mode decision unit decides a mode of a scaled output macro block based on an area of the scaled macro block overlapped with a non-scaled macro block of a reference frame and a mode of the overlapped macro block. A motion vector decision unit decides a reference motion vector of the output macro block based on a motion vector with respect to the overlapped macro blocks. A picture quality preference mode selection unit receives a user picture quality preference command. A motion vector compensation unit compensates the motion vector of the output macro block based on the decided reference motion vector and the picture quality preference command.

Description

[0001] This application claims the priority of Korean patent application 2001-80812 filed at the Korean Industrial Property Office on December 18, 2001, which is incorporated herein for reference. Technical field [0002] The present invention relates to a transcoder and a transcoding method, and more particularly to a transcoder for determining a mode and a motion vector in a transcoding mode, and a method for determining a motion vector in a transcoding mode. Background technique [0003] The moving image signal has a very large amount of data. Therefore, after compressing and encoding the moving image signal and converting the moving image signal into a bit stream, the data is transmitted or recorded. As a compression coding method, the International Organization for Standardization (ISO) 11172 Moving Picture Experts Group (MPEG) method is generally used. [0004] Figure 1 is a block diagram of a conventional transcoder. 1, the conventional transcoder includes VLD (variable len...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/24H04N7/26H04N7/36
CPCH04N19/00587H04N19/00472H04N19/40H04N19/51H04N19/103H04N19/176H04N19/60
Inventor 金泰希崔炳善
Owner SAMSUNG ELECTRONICS CO LTD