Fixed-point wavelet transform method for joint photographic experts group 2000 (JPEG2000) image compression

A technology of wavelet transform and image compression, which is applied in the field of image processing, can solve problems such as wasting storage space, achieve the effects of speeding up, overcoming the infinite storage space of coefficients, and saving storage resources

Active Publication Date: 2014-11-12
XIDIAN UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

Therefore, in a system that requires 5 / 3 wavelet transform and 9 / 7 wavelet transform at the same time, this structure greatly wastes storage space

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  • Fixed-point wavelet transform method for joint photographic experts group 2000 (JPEG2000) image compression
  • Fixed-point wavelet transform method for joint photographic experts group 2000 (JPEG2000) image compression
  • Fixed-point wavelet transform method for joint photographic experts group 2000 (JPEG2000) image compression

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Embodiment Construction

[0037] Attached below figure 1 The implementation steps of the present invention are described in detail.

[0038] Step 1. Input the image data to be compressed in the JPEG2000 image compression system. The image data is stored in X bits, and the value range of X is 1-16 bits.

[0039] Step 2. Perform DC level shift on the input image data to obtain image data with 0 symmetrical distribution.

[0040] Step 3. The user decides whether to use 9 / 7 boosting or 5 / 3 boosting wavelet transform according to whether to perform lossy compression; if it is lossy compression, use 9 / 7 boosting wavelet transform, go to step 4; otherwise, go to step 6 .

[0041] Step 4. The 9 / 7 boosting wavelet transform of BIBO gain control

[0042] 4a) After shifting the DC level, all data is shifted to the left by upshift bits, and the upshift value is any integer greater than 0.

[0043] 4b) Use the floating-point to fixed-point method for each row of data shifted to the left, and perform the standard 9 / 7 boosti...

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Abstract

The invention discloses a fixed-point wavelet transform method for joint photographic experts group 2000 (JPEG2000) image compression. The method comprises the steps of: (1) inputting an image; (2) performing direct current (DC) level shifting; (3) judging whether 9 / 7 wavelet transform is to be adopted or not; (4) performing bounded input bounded output (BIBO) gain-controlled 9 / 7 lifting wavelet transform; (5) quantifying a coefficient after the BIBO gain-controlled 9 / 7 lifting wavelet transform; (6) performing BIBO gain-controlled 5 / 3 lifting wavelet transform; (7) outputting a wavelet transform coefficient; (8) performing arithmetic coding; (9) performing rate distortion optimization interception; and (10) performing code stream organization to obtain a JPEG2000 compressed code stream. A BIBO gain control method is introduced, the storage bit depth of a wavelet transform intermediate value is determined by using a 9 / 7 wavelet transform BIOB gain, and a selection mode and a quantification mode of a 9 / 7 lifting wavelet transform quantification parameter are determined by using a 5 / 3 wavelet transform BIBO gain, so that JPEG2000 system storage resources and running time are greatly saved.

Description

Technical field [0001] The present invention relates to the technical field of image processing, and further relates to an efficient hardware fixed-point realization method of compatible 5 / 3 wavelet transform and 9 / 7 wavelet transform in a JPEG2000 image compression system. The present invention uses the BIBO (Bounded Input Bounded Output) gain of the 9 / 7 boosted wavelet transform to determine the storage bit depth of the intermediate value of the wavelet transform, and uses the BIBO gain of the 5 / 3 boosted wavelet transform to determine the quantization parameter in the 9 / 7 boosted wavelet transform The selection method and the realization method of quantization finally use the same storage space to store the fixed-point 5 / 3 lifting wavelet transform and the fixed-point 9 / 7 lifting wavelet transform. The invention can be used for image compression coding of various digital devices. Background technique [0002] With the development and application of multimedia and network tech...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/63
Inventor 张静李云松郭杰刘凯王柯俨吴成柯
Owner XIDIAN UNIV
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