Single-polarization synthetic aperture radar image pseudo colorization method

Abstract

The present invention discloses a single-polarization synthetic aperture radar image pseudo colorization method. The method includes the following steps that: 1, the amplitude data of a single-view SAR image are obtained, negative exponential transformation is performed on the amplitude data, the transformed amplitude data are normalized to an interval of [0, 1]; 2, the grayscale u of the interval of [0,1] is corresponding to the grayscale U of an interval of [0,255]; 3, the grayscale of the interval of [0,255] is divided into 4 layers, and each layer of pixel grayscale is transformed differently, so that RGB data can be obtained; and 4, the RGB-channel data obtained in the step 3 are synthetized into a pseudo-color image. With the method of the invention adopted, the obtained pseudo-color image has a unique noctilucent effect; an artificial target with strong scattering and a natural region with weak scattering can be well differentiated, in specific, the weak scattering region embodies deep blue, the strong scattering target embodies orange; and since evident visual discrimination can be realized, target judgment and interpretation can be benefitted.

Description

technical field [0001] The invention relates to a single-polarization synthetic aperture radar (SAR) image pseudo-colorization method with luminous effect, and belongs to the technical field of grayscale image pseudo-color coding. Background technique [0002] Pseudo-color enhancement is the process of converting grayscale images into color images through linear or nonlinear transformation. Since the human eye is sensitive to color information, the application of false color enhancement technology is beneficial to highlight the details of the image and improve the efficiency of target recognition and interpretation. Compared with multi-polarization and multi-band pseudo-color enhancement methods, there are fewer methods for single-polarization SAR images. [0003] The classical pseudo-color enhancement method for SAR images is called pseudo-color coding. Pseudocolor coding is the process of converting a grayscale image into a pseudocolor image with different colors, and is...

AI Technical Summary

Problems solved by technology

However, due to the very large dynamic range of microwave scattering intensity, ordinary grayscale image display is often not conducive to the presentation of the above information

However, the method based on the color transfer of optical images cannot well reflect this characteristic of SAR images, and cannot distinguish between man-made targets and natural objects.

[0007] The prior art closest to the present invention is the intensity layering method based on the spatial domain. The disadvantages of the existing spatial domain intensity layering technology are: the universality of the intensity layering strategy is not enough, and the pseudo-color images obtained in different scenes It is difficult to obtain a stable color image style, and the color of the pseudo-color image is messy, which is not conducive to distinguishing between man-made targets and natural features

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