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DCT-based resolution flexible image coding and decoding method

A decoding method and resolution technology, which are applied in the field of realizing scalable resolution, can solve problems such as the inability to realize scalable encoding of resolution, and achieve the characteristics of realizing scalable encoding and decoding of resolution, saving transmission bandwidth, and flexible scalability. Effect

Inactive Publication Date: 2008-02-20
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

The coefficients of the original image after DCT and quantization are coded according to zigzag scanning, resulting in the same independent coding unit containing coefficients of all frequency components, which cannot achieve resolution scalable coding

Method used

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  • DCT-based resolution flexible image coding and decoding method
  • DCT-based resolution flexible image coding and decoding method
  • DCT-based resolution flexible image coding and decoding method

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Embodiment Construction

[0029] Specific embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0030] The original image undergoes discrete cosine transformation (Discrete Cosine Transformation, DCT for short) and the quantized coefficients (shown in Figure 2) are scanned according to zigzag (scanning order in Figure 3), and the frequency increases sequentially. However, for the frequency characteristics reflected by the DCT coefficients, this zigzag scanning coding mode cannot realize scalable coding of resolution. The present invention uses the frequency of the DCT quantized block and its corresponding positional relationship in the block, as well as the resolution characteristics, to arrange the same frequency in the same recombined coding block, and encode according to the priority of the resolution; in the decoding process, Restore its DCT position in the original macroblock according to the frequency of the received recombined coded block, ...

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Abstract

The utility model provides an encoding and decoding method based on the DCT resolution telescopic image, which is characterized in that, in the process of coding, an original image or video frequency frame is divided into (4xN)2x(4xN)2 macro blocks, the macro blocks are divided into (4xN)x(4xN) code blocks, the same frequency is arranged in a same restructuring encoding block to encode according to the PRI of the resolution property by using the frequency of the coefficient in the code blocks after DCT quantification, the corresponding position relations of the frequency in the blocks, and the resolution characteristic; in the process of decoding, the received restructuring encoding block is reverted to the DCT position in the original macro blocks, and the IDCT encoding block is selected to recompose the resolution telescopic image according to the resolution grade of the current coding block. The encoding and decoding method has an advantage that the corresponding coding flow can be transmitted according to the different receiving ends, so the transmitting bandwidth is effectively saved, and the resolution telescopic coding and decoding code is agile than the DWT.

Description

technical field [0001] The invention relates to the field of image and video coding, in particular to providing a method for realizing scalable resolution during video transmission. Background technique [0002] Discrete Cosine Transformation (DCT) is widely used in image and video encoding and decoding, such as the image encoding standard JPEG formulated by the Still Image Experts Group, and the video encoding and decoding standards MPEG1, MPEG2, and MPEG4 established by the Moving Image Experts Group. And H.261, H.262 and H.263 developed by ITU, and the video coding standard H.264 / AVC developed by JVT, and these standards are widely used in various image and video equipment, such as mobile phones, video cameras, digital cameras, Equipment related to media information such as cameras, TV sets, and DVDs. Due to the diversity of current media terminals, such as PDAs, computer monitors, and TVs, their display terminals are different. PDAs or mobile phones are about 2 inches, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26H04N7/30H04N19/124H04N19/129H04N19/176H04N19/625
Inventor 吴宗泽谢胜利陈易光张克新张勰余荣
Owner SOUTH CHINA UNIV OF TECH
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