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Synthetic aperture radar complex numeric image data real time automatic compression method

A synthetic aperture radar, image data technology, applied in image data processing, image coding, reflection/re-radiation of radio waves, etc., can solve problems such as low efficiency, complex coding operations, and inability to parallelize coding, and reduce the data rate. , The quantization operation is simple, and the effect of real-time compression is satisfied.

Inactive Publication Date: 2005-09-07
宁波欧德意物联科技有限公司
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Problems solved by technology

[0006] The purpose of the present invention is to: overcome the shortcomings of the existing compression method that the encoding of sub-blocks and sub-blocks cannot be parallelized in the compression process, the encoding operation is complicated, the efficiency is not high, and it is not conducive to the real-time automatic compression of complex image data; The shortcomings of the method's phase fidelity are not high enough; in order to reduce the amount of SAR image data, meet the shortcomings of star and existing compression methods; in order to reduce the amount of SAR image data, meet the requirements of spaceborne (or airborne) SAR systems The real-time and automatic requirements of complex image data compression in the system, while further improving the fidelity of complex images; thus providing a method for real-time automatic data compression of synthetic aperture radar complex images

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  • Synthetic aperture radar complex numeric image data real time automatic compression method
  • Synthetic aperture radar complex numeric image data real time automatic compression method
  • Synthetic aperture radar complex numeric image data real time automatic compression method

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Embodiment Construction

[0049]The present invention takes the SAR complex image data of the synthetic aperture radar mountain as an embodiment to describe the present invention in detail:

[0050] 1. First transform the SAR complex image of the synthetic aperture radar mountain into a grayscale image:

[0051] refer to Figure 5A ,Should Figure 5A is the modulus image of the SAR complex image, first put Figure 5A The real part and imaginary part (positive and negative real numbers) of the SAR complex image shown are transformed into the value range (0-255) of the grayscale image in the same proportion, such as Figure 5B and 5C shown;

[0052] 2. secondly, the grayscale image obtained in step 1 is divided into sub-blocks by width 512 pixels * height 512 pixels, and each sub-block is compressed in the same steps, and the steps include:

[0053] 1) Carry out two-dimensional FFT transformation 22 to each sub-block;

[0054] 2) Obtain the location information 23 of the non-zero coefficient region...

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Abstract

This invention provides a SAR complex image data real-time compressing method, comprising the following steps: first, dividing complex image into several blocks, compressing and encoding each unit of sub-block, two-dimension Fourier transforming the every sub-block, using sciagraphy to analyze transformed data to defining non-zero coefficient and its zone, quantizing non-zero coefficient; second, differential encoding position information in non-zero zone and setting it in the head of code stream, separately grid coding quantizing real part and imaginary part then through arithmetic encoding to form terminal code stream. The invention is characterized in meeting request of real-time and automatically compressing complex image data in space-borne system and high fidelity of phase.

Description

technical field [0001] The invention relates to a method for compressing complex image data, in particular to a method for real-time automatic data compression of synthetic aperture radar complex images. Background technique [0002] Synthetic Aperture Radar (SAR) is an earth observation system that uses microwave imaging. It is a high-resolution imaging radar system that is widely used in disaster monitoring, resource exploration, marine research, military reconnaissance and many other fields. . [0003] Such as figure 1 A block diagram of the signal processing for a typical synthetic aperture radar. The signal processing flowchart includes: [0004] The signal S(t)1 received by the radar is orthogonally separated 2 into I-phase and Q-phase signals, and then converted into digital signals through the A / D converter 3, and the complex signal composed of I-phase and Q-phase digital signals is matched The filter 4 processes and obtains the complex image data 5 of the SAR (t...

Claims

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Application Information

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IPC IPC(8): G01S7/02G01S13/90G06T9/00
Inventor 翟杰夫王贞松
Owner 宁波欧德意物联科技有限公司
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