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Linear array push-broom type image optimum scanning line search method based on object space projection geometrical constraint

A technology of projection geometry and scan line, applied in the field of surveying and mapping science, which can solve the problem of the efficiency bottleneck of linear push-broom imaging

Inactive Publication Date: 2008-06-11
WUHAN UNIV
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Problems solved by technology

The existing optimal scanning line search methods all adopt the image square search strategy based on the strict sensor mathematical model, that is, the collinear equation of the center projection. Efficiency bottleneck of image post-processing and application

Method used

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  • Linear array push-broom type image optimum scanning line search method based on object space projection geometrical constraint
  • Linear array push-broom type image optimum scanning line search method based on object space projection geometrical constraint
  • Linear array push-broom type image optimum scanning line search method based on object space projection geometrical constraint

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Embodiment Construction

[0053] The present invention will be described in further detail below in conjunction with the accompanying drawings. As shown in Figure 1, in summary, the implementation of this method can be divided into three stages:

[0054] The first stage: calculate the relevant parameters of the projection plane of the image scanning line center.

[0055] 1. As shown in Figure 2, the scan line center projection plane 1 is the spatial plane formed by the CCD line array sensor 2 and its projection center 3 at the moment of imaging of each scan line of the linear push-broom image. Based on the Douglas-Pocke vector compression algorithm, the CCD linear array sensor is divided into n segments, n is a positive integer and usually the value is not greater than 30; the CCD detectors within each segment are approximated by a straight line, so that each segment of the CCD detector When scanning imaging, a scanning line center projection plane is formed with the scanning line projection center; w...

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Abstract

An optimum scanning beam searching method of linear array push-broom image based on object space projection geometric constraint is provided, which divides CCD linear array sensor into sections and indicates each section by a straight line; when the CCD detector scan imaging, a scan imaging center projection plane is formed between the CCD detector and the scan imaging center; the six affine transformation indexed from the average height projection plane coordinates of the linear array push-broom image object space to the image scanning coordinates are evaluated; the evaluated value of neighboring scanning line central projection plane space distance of image is gotten; evaluate the imaging position of object on image; iterative computation of scanning line object space searching is conducted; two scan line central projection planes nearest to the object point are positioned, the exact solution of the optimum scanning line object space is counted through object space interpolation. The invention is simple and easy to realize, which greatly reduces the counting amount of optimum scanning beam searching, thus being able to improve the efficiency of coordinate back projection counting of linear array push-broom image. The invention is particularly applicable processing the linear array push-broom mass images of high resolution.

Description

technical field [0001] The invention belongs to the field of surveying and mapping science and technology, and relates to a fast search method for the optimal scanning line of a linear array push-broom image based on geometric constraints of object-space projection. This method combines the unique photographic geometric relationship of linear array push-broom images, and adopts a new object-space search strategy based on the spatial constraints of the projection surface of the center of each scan line to realize the efficient search of the best imaging scan line for object-space points. Background technique [0002] Linear array push-broom sensors have been widely used in the field of aerospace photogrammetry, which has opened up a new way for photogrammetry and remote sensing applications. In the field of aerospace, the CCD sensors loaded on satellites such as IKONOS, SPOT5, CBERS-2, and QuickBird are linear array push-broom sensors; in the field of aerial remote sensing, s...

Claims

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Application Information

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IPC IPC(8): G01C11/00G01B11/03
Inventor 王密胡芬王海涛
Owner WUHAN UNIV
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