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Adaptive coding method and device

A coding and coding source technology, applied in the field of coding source image sequences, can solve the problem of not being able to easily track the movement of small targets

Inactive Publication Date: 2006-01-11
THOMSON LICENSING SA
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Problems solved by technology

Although this type of estimator provides a more uniform motion field, the motion of small objects cannot be easily tracked due to the low-resolution / high-resolution approach

Method used

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  • Adaptive coding method and device
  • Adaptive coding method and device

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Embodiment Construction

[0026] Figure 1 shows the video sequence encoder of the present invention.

[0027] The digital video data of the source image is received at the input of the encoder which is transmitted to the pre-analysis circuit 6. The image is filtered and transmitted to the first input of the subtractor 1 in image blocks. Depending on whether the coding mode is internal or intermediate, the subtractor 1 transmits information about the current block received at its first input, or subtracts the latest information corresponding to the predicted block obtained at its second input from the latter. The output data of the subtractor 1 is transmitted to the discrete cosine and quantization conversion circuit 2. The quantized output coefficient of this circuit undergoes entropy encoding by the entropy encoder 3 and then is stored in the buffer memory 4. The fill level of this memory is transmitted to the bit rate control circuit 5, which also receives data from the pre-analysis circuit, which influe...

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Abstract

The method containing a pre-analysis phase (6) with pel-recursive type motion estimation and an actual coding phase with block matching motion estimation (11) for picture blocks constituted by one or more sub-blocks, characterised in that the coding phase also comprises - a motion vector selection stage for the picture sub-blocks based on the motion vectors calculated by matching for the block containing the sub-block and based on the motion vectors calculated by the pel-recursive type estimation for the pixels or the pixel groups belonging to the sub-block, - and a calculation stage of the best partition of a picture block into sub-blocks based on the correlation calculations taking into account the motion vectors selected from the sub-blocks constituting a block.

Description

Technical field [0001] The invention relates to a method and device for encoding a sequence of source images. More specifically, the method includes a pre-analysis step of pixel-regression motion estimation type and a special coding step of block matching motion estimation. Background technique [0002] The domain is video compressed. We are particularly interested in MPEG4 standard-compliant encoding circuits. [0003] The "block matching" type motion estimation is implemented in the encoder to use the timing correlation of the images in the image sequence. It calculates subtracting the pre-selected block from the current block encoded in the intermediate mode. Due to the different selection of coding parameters proposed by the standard, for example, the size of the image block for motion estimation, the reference image or motion estimation from the image, the upper field, the lower field or the frame of these reference images, etc., then according to criteria such as coding cos...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/50H03M7/30H03M7/36H04N19/50
CPCH04N19/00781H04N19/006H04N19/00678H04N19/00587H04N19/00018H04N19/00696H04N19/52H04N19/51H04N19/61H04N19/103H04N19/53H04N19/57H04N19/137
Inventor 扬妮克·奥利维耶爱德华·弗朗索瓦皮埃尔·吕埃卢
Owner THOMSON LICENSING SA
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