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Remote sensing image data compression method capable of maintaining measurement performance

A technology for data compression and remote sensing images, applied in image communication, digital video signal modification, television, etc.

Inactive Publication Date: 2013-05-08
王慧 +1
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  • Application Information

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Problems solved by technology

[0007] 1. It is not easy to obtain remote sensing images. Existing aerospace remote sensing images require a lot of manpower, financial and material resources to establish a remote sensing data acquisition system, resulting in high cost of remote sensing images, and lossy compression of remote sensing images. Information loss is unacceptable;
[0008] 2. The precision required for remote sensing image processing and application is high. Remote sensing images are not only used for human observation, but also for computer search, identification and measurement. If the general lossy compression method is used, information due to The loss of remote sensing images affects the application effect of remote sensing images

Method used

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  • Remote sensing image data compression method capable of maintaining measurement performance
  • Remote sensing image data compression method capable of maintaining measurement performance
  • Remote sensing image data compression method capable of maintaining measurement performance

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Embodiment Construction

[0073] The invention provides a data compression method that maintains the performance of remote sensing image measurement, such as figure 1 ,Specific steps are as follows:

[0074] Step 1), collecting remote sensing image data with different resolutions, such as Figure 4 The digitized aerial remote sensing image of the urban area shown in (a) with an actual size of 230×230mm and a scanning resolution of 25μm, and, Figure 4 Figure (b) shows the digital aerial remote sensing image with the actual size of 180×180mm and the scanning resolution of 25μm, mainly vegetation. Collect some common characteristics of remote sensing images, such as average value, variance, entropy value, average energy, clarity, autocorrelation coefficient and information entropy, etc., such as Figure 10 shown;

[0075] Let the digital remote sensing image be f(x, y), and its pixel f(i, j)=a k , k={1, 2, 3,...L}, i, j are the abscissa and ordinate of the pixel respectively, L is the maximum gray va...

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Abstract

The invention discloses a remote sensing image data compression method capable of maintaining measurement performance. A remote sensing image is processed by adopting wavelet transform, so the method is suitable for the compression of the remote sensing image. The remote sensing image is converted and coded by adopting integer wavelet transform, so transformation from an integer to another integer can be realized, the inverse transformation of the transformation from the integer to another integer can completely reconstruct the image, the uncontrollable loss of image information is avoided, and integer-wavelet-transform-based lossless image compression becomes possible. The compression efficiency is improved, and a compression ratio is increased by improved embedded zerotree wavelet (EZW)coding methods for the establishment of a zerotree marker table, the integer updating processing of a wavelet decomposition coefficient, the change of a scanning direction of the wavelet decomposition coefficient, the independent processing of the lowest frequency sub-band coefficient and the like. Characteristic points of important characteristics in the remote sensing image are extracted, and are identified in a wavelet transform process, and an integer wavelet decomposition coefficient in a high frequency sub-band is predicted and compensated by utilizing an integer wavelet decomposition coefficient recovery value in a low frequency sub-band to improve the performance of measuring the decompressed image.

Description

technical field [0001] The invention belongs to the technical field of remote sensing image data compression and digital signal processing, and relates to wavelet transform for high-resolution remote sensing images and an EZW (embedded zero-tree wavelet coding) compression method for remote sensing images, in particular to remote sensing image data that maintains measurement performance compression method. Background technique [0002] With the continuous development of photoelectric technology, computer technology and remote sensing technology, more and more information obtained through remote sensing exists and processed in digital form, which brings more direct and richer data sources to digital photogrammetry. . However, while promoting the development of digital photogrammetry production technology, product quality and quantity, massive remote sensing information data (mainly remote sensing image data) puts forward higher requirements for storage and transmission condi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/26H04N19/63H04N19/635
Inventor 王慧耿则勋胡志定张勇王利勇李鹏程刘忠滨
Owner 王慧
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