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Inner field stitching method of non-collinear TDI CCD imaging data based on line frequency normalization

A field of view splicing and imaging data technology, which is applied in the field of surveying and mapping science, can solve the problems of inconsistency and inapplicability of line integration time between spaceborne non-collinear TDICCD slices, and achieve strong applicability and versatility, easy to implement, The effect of simple method

Inactive Publication Date: 2011-11-02
WUHAN UNIV
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Problems solved by technology

[0004] The overall line integration time jump of the space-borne non-collinear TDI CCD and the inconsistency of the line integration time between the slices lead to the offset of two adjacent slices changing according to a certain law, so the traditional translation and splicing processing method of two adjacent slices then no longer applies

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  • Inner field stitching method of non-collinear TDI CCD imaging data based on line frequency normalization
  • Inner field stitching method of non-collinear TDI CCD imaging data based on line frequency normalization
  • Inner field stitching method of non-collinear TDI CCD imaging data based on line frequency normalization

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Embodiment Construction

[0037] The present invention will be described in further detail below in conjunction with the accompanying drawings. figure 1 Taking the simplest three-chip TDI CCD as an example, a schematic diagram of the push-broom imaging mode of a non-collinear TDI CCD camera is given. Three TDI CCDs are arranged in the focal plane of the camera according to the zigzag bias field ( figure 1 (a)), the three TDI CCDs share a set of orbit, attitude and camera external parameters during push-broom imaging along the satellite orbit ( figure 1 (b)), the three TDI CCD images are aligned according to the imaging time (line count) to form the original image ( figure 1 (c)), p1 and p2 in the figure are a pair of points with the same name in the left TDI CCD image and the middle TDI CCD image respectively, and point P is the corresponding object point.

[0038] On the focal plane of the high-resolution optical camera, N pieces of TDI CCDs are arranged in a non-collinear manner, and N is 2 to 20; ...

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Abstract

The invention relates to an inner field stitching method of non-collinear TDI CCD imaging data based on line frequency normalization, comprising the following steps: extracting the line integration time information of each TDI CCD image; extracting the line integration time information of each TDI CCD image; carrying out line frequency normalization on N-numbered TDI CCD images; and carrying out translational stitching on the N-numbered TDI CCD images after line frequency normalization. The integration time of each scanning line on the resampled images is the same by carrying out line frequency normalization on the images obtained by each TDI CCD of a non-collinear TDI CCD camera, thus creating conditions for inner field stitching of non-collinear TDI CCD imaging data based on relative translation among pieces and finally forming a spatially continuous seamless complete virtual scan scenery. The method is simple and practical and has stronger applicability and universality under the conditions of line integration time hopping, no synchronization among pieces and the like of multiple TDI CCD imaging.

Description

technical field [0001] The invention belongs to the field of surveying and mapping science and technology, and in particular relates to a non-collinear TDI CCD imaging data inner visual field splicing method based on line frequency normalization. Background technique [0002] For high-resolution optical cameras, in order to solve the problem of insufficient spectral energy of the image plane of the optical system caused by factors such as relative aperture reduction and imaging exposure time shortening, a time-delayed integral charge-coupled device (TDI CCD) is used as an imaging sensor. Sensors are currently a major technical approach. TDSI CCD is a new type of photoelectric imaging device that utilizes the principle of time-delayed integration of charges. Compared with ordinary single-integration linear array CCD, it can expose ground objects multiple times in the form of multiple time-delayed integration imaging, which doubles the efficiency of the system to collect energ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/353G06T5/50
Inventor 王密胡芬金淑英
Owner WUHAN UNIV