Encoding method of remote sensing image

A technology of remote sensing image and coding method, which is applied in the field of image processing, and can solve problems such as inaccurate code rate control, decreased peak signal-to-noise ratio of restored images, and large coding redundancy, so as to improve coding efficiency and speed, reduce range, and reduce effect of complexity

Inactive Publication Date: 2012-11-21
南京太亚工程技术服务有限公司
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Problems solved by technology

[0004] Aiming at the shortcomings of the PCRD method, many scholars have proposed new methods, such as [Auli-Llinas F, Serra-Sagrista J, Monteagudo-Pereira J, et al.Efficient rate control for JPEG2000coder and decoder[J].Proc.IEEE DCC, Mar.2006, 1:282-291.] and literature [Qin Cheng, Chen Zhiyun, Yu Kun, Zhou Yan. Research on rate control algorithm based on JPEG2000[J]. Computer Application and Software, 2011, Volume 28 (Phase 2): 76-80.] The proposed algorithm is a code rate control algorithm based on the interlaced scanning coding channel, the JPEG2000 rate control method of real-time truncation with the patent No. 200410026016. The distributed JPEG2000 adaptive rate control system and method, etc. These papers and inventions have significantly improved the coding efficiency of JPEG2000, but the code rate control is not accurate enough, and the peak signal-to-noise ratio (PSNR) of the restored image has dropped significantly
Literature [Kim T., Kim H.M., Tsai P.S., et al.Memory efficient progressive rate-distortion algorithm for JPEG2000[J].IEEE Trans.on Circuits and Systems for Video Technology.2005,15(1):181-187. ] and [Wang Chao, Wang Jiong. An effective JPEG2000 compression rate control algorithm [J]. Journal of Donghua University (Natural Science Edition), 2011, Volume 37 (Phase 1): 76-80.] proposed The method reduces the amount of encoding calculation and storage, but the encoding redundancy is relatively large at high bit rates, and the minimum slope search operation is increased

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[0033] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0034] First of all, the purpose of the present invention is to propose an effective coding method for remote sensing images based on the JPEG2000 standard for the problems of a large number of redundant calculations and waste of storage resources during Tier 1 coding of remote sensing images based on the JPEG2000 standard. , to improve Tier 1 coding: firstly, according to the size of the number of effective bit planes, adjust the encoding order of the coding block, so that it is coded sequentially from the largest number of effective bit planes to the smallest number of effective bit planes; then according to the compression factor and the target code rate relationship, an adaptive formula is proposed to calculate the threshold value of the rate-distortion slope. The basis for the improvement of the scheme of the present invention is that ...

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Abstract

The invention discloses an encoding method of a remote sensing image. The method comprises the following steps: performing preprocessing on an original remote sensing image, then performing discrete wavelet transformation and quantization processing on the original remote sensing image; dividing a quantized sub-brand coefficient into encoding blocks in smaller sizes, performing plane expansion of significant bit with the same bit depth on each encoding block, and then sequentially ordering each encoding block from small to large; performing embedded bit plane encoding and MQ (multiplier-quotient) arithmetic encoding on each encoding block; calculating rate distortion-slope and accumulation rate of each channel of each bit plane of each ordered encoding block and determining whether to stop accumulating or not; calculating threshold of the rate-distortion slope and screening the rate-distortion slope of remaining channels based on the threshold; and carrying out Tier2 encoding. By adopting the encoding method provided by the invention, coding redundancy of Tier1 can be greatly reduced, and searching range of threshold value of an optimal-rate distortion-slope and optimal cut-off point during the Tier2 encoding is narrowed, so that the encoding efficiency and speed of the remote sensing image are remarkably improved and the complexity is reduced.

Description

technical field [0001] The invention belongs to the field of image processing, in particular to a coding method for remote sensing images. Background technique [0002] With the improvement of the resolution of remote sensing images, the amount of remote sensing image data also increases, making the real-time transmission and storage of data more and more difficult, so effective image compression is particularly important. [0003] At present, remote sensing image compression coding usually adopts JPEG2000 compression coding standard. The coding method of JPEG2000 standard has a high complexity, and most of its complexity comes from the embedded block coding with optimized truncation (EBCOT) code rate control method. EBCOT consists of two parts: Tier 1 encoding and Tier 2 encoding. Among them, Tier 1 encoding accounts for about 45%-60% of the calculation time of the JPEG2000 encoder. Reducing the calculation of Tier 1 will greatly reduce the processing time of the encoding ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26H04N19/124H04N19/147H04N19/176H04N19/63
Inventor 陈晓徐晓庆
Owner 南京太亚工程技术服务有限公司
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