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Static colour image compression method JPC3D based on 3D-DCT and in frame prediction

A 3D-DCT, intra-frame prediction technology, used in image coding, image data processing, instrumentation, etc.

Inactive Publication Date: 2006-11-15
NANJING UNIV
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Problems solved by technology

[0003] The technical problem to be solved by JPC3D of the present invention is to improve the compression efficiency of the DCT-based static color image compression method, effectively remove the correlation between blocks and between the three colors, and make it reach a level comparable to JPEG2000, and at the same time make the method Much less complex than JPEG2000

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  • Static colour image compression method JPC3D based on 3D-DCT and in frame prediction
  • Static colour image compression method JPC3D based on 3D-DCT and in frame prediction
  • Static colour image compression method JPC3D based on 3D-DCT and in frame prediction

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Embodiment Construction

[0013] Attached below figure 2 , 3 A specific implementation process of the present invention will be described. The whole coding mainly includes the following steps:

[0014] 1) Decompose the input image into 8×8 blocks;

[0015] 2) Use the upper and left adjacent pixels of a block to predict the block. There are 9 kinds of prediction methods, including vertical prediction, horizontal prediction, DC prediction, left diagonal prediction, right diagonal prediction, vertical left prediction, horizontal down prediction, vertical right prediction, horizontal up prediction, etc. The optimal prediction mode is searched for each 8×8 block, and a mode that minimizes the sum of absolute errors (SAE) of the three chroma is selected.

[0016] 3) Superimpose the three-color blocks in an 8×8 block into a three-dimensional cube, such as image 3 As shown, then perform 8×8×3 three-dimensional discrete cosine transform (3D-DCT). The 3D-DCT formula is

[0017] F ...

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Abstract

The present invention relates to a static color image compression method-JPC3D based on 3D-DCT and intraframe prediction. The invented technical field belongs to digital image processing technology and its coding technology, reducing complexity of static image compression, at same time retaining picture fine grain. It is characterized by that said invention adopts color three-dimensional coding technique block processing technique, filter decoding technique and interblock correlation and chrominance redundance degradation technique so as to implement the invented method. Said invention also provides its main application field.

Description

technical field [0001] The invention relates to a method for compressing static color images, in particular to a static color image compression method based on 3D-DCT and intra-frame prediction. Background technique [0002] Currently, static color images are generally compressed using JPEG based on discrete cosine transform (DCT). JPEG compresses the image in blocks. Although the correlation between pixels in the block is effectively removed, the correlation between blocks is not well removed. At the same time, the three color components are compressed separately, and the correlation still existing between the chroma is not considered as a whole. Therefore, the static color image compression method based on DCT still has great potential for improvement. JPEG2000, the successor standard of JPEG, uses wavelet transform instead of discrete cosine transform. Although it can obtain higher compression efficiency than JPEG, it has not been well promoted because of its high compu...

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Application Information

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IPC IPC(8): G06T9/00
Inventor 都思丹叶迎宪薛卫袁杰高敦堂刘红星
Owner NANJING UNIV
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