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JPEG2000 self-adapted rate control system and method based on pre-allocated code rate

A bit rate allocation and adaptive bit rate technology, applied in the field of image processing, can solve the problems of large image quality loss and low peak signal noise, achieve high compression performance, accurate bit rate pre-allocation, and reduce the amount of calculation and storage space Effect

Inactive Publication Date: 2008-01-16
SHANDONG HUAYU AEROSPACE TECH CO LTD
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Problems solved by technology

However, the peak signal-to-noise ratio (PSNR) of this algorithm is low, which is generally lower than that of the PCRD algorithm by more than 0.8dB, and the image quality is greatly lost.

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  • JPEG2000 self-adapted rate control system and method based on pre-allocated code rate
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  • JPEG2000 self-adapted rate control system and method based on pre-allocated code rate

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Embodiment Construction

[0047] Referring to Figure 1, the JPEG2000 core encoding system mainly includes: preprocessing, discrete wavelet transform, quantization, bit plane + MQ encoder, optimized interception, and code stream organization. The input original processing image is transformed into a series of different frequency bands after preprocessing and discrete wavelet transform; then the transformed coefficients are quantized according to the compression requirements; the quantized subbands are divided into code blocks, which are used as JPEG2000 entropy coded The basic processing unit; perform entropy coding processing of the arithmetic coder MQ on each code block to generate the original compressed code stream; then, use the rate-distortion optimization interception algorithm in the T2 encoder to intercept the code stream according to the requirements; finally organize the code stream Generate the final compressed bitstream output.

[0048] Referring to Fig. 2, the present invention adds an ent...

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Abstract

The invention discloses a JPEG2000 self-adapting rate control system and a method based on pre-assignment of code rate, mainly solving the problem of large calculation amount and large memory size of JPEG2000 encoding method. The code block of the original image after pretreatment, wavelet transformation and quantification is output by two lines, one line directly enters the bit plane and MQ coder; for the other line, the entropy of each code block is estimated by the entropy estimate module, sent to the code rate assignment module to assign code rate, and the code rate of each code block is feed back to the bit plane and MQ coder through the encoding depth control module, after the code blocks are encoded by the bit plane, further feed back to the encoding depth control module to determine the output code stream of each encoded code block, and the output code stream is under optimal interception and code stream organization to output the ultimate code stream. At the same time, the invention can change the threshold value of the encoding depth control coefficient as required, to flexibly control the encoding depth in order to improve the image compression quality. The invention has the advantages of low complexity and easiness for hardware implementation, and is suitable for various JPEG2000 image real-time compression systems.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a JPEG2000 optimized bit rate control method based on bit rate pre-allocation, which is used for image compression encoding of various digital devices. Background technique [0002] With the development and application of multimedia and network technology, the existing still image compression standard JPEG can no longer meet the requirements of the current market and practical applications. Therefore, the International Standard Organization formulated a new standard JPEG2000 for still image compression in November 2000. The new standard adopts the wavelet transform and rate-distortion optimization proposed by Australian scholar David Taubman in High PerformanceScalable Image Compression vith EBCOT (IEEE Trans.Image Processing, vol.9, no.7, pp.1158-1170, July 2000) The embedded code block coding algorithm EBCOT is intercepted, which is divided into two parts: T1 coder and...

Claims

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Application Information

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IPC IPC(8): H04N7/26H04N1/41H04N19/146
Inventor 李云松孔繁锵王柯俨吴成柯刘凯雷杰周有喜汪美珠
Owner SHANDONG HUAYU AEROSPACE TECH CO LTD
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