Epipolar image generating method of universal line array satellite
A technology of satellite core and general line, applied in the field of computer vision, can solve the problems of controlling within one pixel, difficult up and down parallax, etc., to achieve the effect of eliminating up and down parallax, good robustness and applicability
Active Publication Date: 2018-09-28
WUHAN UNIV
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[0004] The above two types of methods have their own advantages and disadvantages. The method based on the object-space projection reference plane is simple and convenient, and it is relatively easy to obtain left and right epipolar images with consistent resolution.
However, due to the use of the global affine model, it is difficult to ensure that the upper and lower parallax in any area is controlled within one pixel
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[0031] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0032] Such as figure 1 As shown, a method for generating a general linear array satellite epipolar image comprises the following steps:
[0033] Step 1: Data preparation. Obtain the three-dimensional linear array satellite image data, including image tif and orientation parameter file RPC.
[0034] The invention is applicable to homologous image pairs, including homologous stereo and heterologous stereo, and is also applicable to heterologous image pairs, and has strong applicability. This aspect requires that the input data must be preprocessed data, that is, with high-precision positioning parameters RPC, preprocessin...
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he invention discloses an epipolar image generating method of a universal line array satellite. The method comprises the following steps: selecting a left image in a stereo image pair as a reference image, allowing an epipolar ray to be strictly parallel to an image line in the space of the reference image in an image blocking area-for-area correction manner, and using an affine transformation model to describe a mapping relationship before and after blocking correction in order to establish a coordinate transformation relationship between the epipolar ray image and the original image; and simultaneously projecting the corrected left epipolar image and the right original image to one reference substance of an object space based on an object space projection image idea, and re-sampling thereference surface to generate a right epipolar image having the same size and same resolution with the left epipolar image. The method well considers the epipolar ray direction change in every area ofthe image, effectively controls the vertical parallax of the full-image epipolar rays to be close to zero, and especially has a good robustness to the stereo image pair with an unstable nuclear linerelationship.
Description
technical field [0001] The invention relates to computer vision technology, in particular to a general line array satellite epipolar image generation method. Background technique [0002] With the development of satellite remote sensing technology, linear array CCD push-broom imaging technology has become an important technology for high-resolution remote sensing satellite imaging. An important means of stereo observation. The production of DSM from linear array satellite stereo image pairs is an important aspect of surveying and mapping remote sensing applications, and epipolar image generation is an important link before dense matching. Correct epipolar constraints can convert two-dimensional matching problems into one-dimensional matching This can greatly improve the efficiency and reliability of matching, so generating epipolar images from stereo pairs is a very necessary task with practical significance and application value. [0003] Since the linear array satellite ...
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Inventor 张永军陈湘广段延松万一
Owner WUHAN UNIV