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Method and system for sub-pixel positioning of small-scale ground objects based on image aggregation

A positioning method and sub-pixel technology, applied in the field of remote sensing, can solve the problem of difficult to obtain the distribution of mixed pixel ground objects

Active Publication Date: 2020-10-27
INST OF AGRI RESOURCES & REGIONAL PLANNING CHINESE ACADEMY OF AGRI SCI
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Problems solved by technology

The overall calculation efficiency of the direct solution algorithm is high, and the operation speed is fast, but it is generally difficult to obtain the accurate distribution of ground objects inside the mixed pixel in one calculation, so the direct solution algorithm has certain limitations in application

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  • Method and system for sub-pixel positioning of small-scale ground objects based on image aggregation
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  • Method and system for sub-pixel positioning of small-scale ground objects based on image aggregation

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Embodiment Construction

[0026] Embodiments of the present invention are described below with reference to the drawings, in which like parts are denoted by like reference numerals. In the case of no conflict, the following embodiments and the technical features in the embodiments can be combined with each other.

[0027] Image aggregation can reflect not only the number of sub-pixels in a mixed pixel, but also the spatial distribution of sub-pixels. It is one of the means to effectively use prior information to describe the spatial distribution pattern of ground objects. The invention introduces the concept of image aggregation degree for the first time to simulate the spatial distribution of small-scale ground objects, and proposes a sub-pixel positioning method based on image aggregation degree. The principle diagram of the method of the present invention is as Figure 1-2 shown.

[0028] S1, Sub-pixel spatial distribution initialization: According to the abundance value calculated by the mixed pi...

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Abstract

A sub-pixel positioning method and system for small-scale ground objects based on image aggregation, the method includes: S1, according to the abundance value calculated by the mixed pixel decomposition model, the sub-pixels in the experimental remote sensing image are randomly assigned to the ground type , to obtain the sub-pixel initialization result; S2, based on the prior information and the sub-pixel image aggregation in the sub-pixel positioning results, establish the image aggregation objective function; S3, optimize the objective function in S2; S4, traverse the sub-pixel For all mixed pixels in the pixel initialization result, perform step S3 for each mixed pixel; S5, use an iterative algorithm to repeat steps S3-step S4. Compared with the K-mean hard classification method and the pixel exchange sub-pixel positioning model, the sub-pixel positioning accuracy is improved, and it provides a new idea for better breaking through the limitation of the spatial resolution of remote sensing images.

Description

technical field [0001] The present invention relates to remote sensing technology, and more specifically, to a sub-pixel positioning method. Background technique [0002] Mixed pixels are ubiquitous in remote sensing images, and their existence has become one of the main obstacles to further improve the accuracy of remote sensing classification and recognition of ground objects. Aiming at the problem of mixed pixel decomposition, it is necessary to study the properties of the pixel land type in the mixed pixel, the proportion (abundance) of different land types, and its spatial distribution. The corresponding technologies are end-member extraction technology, mixed pixel Decomposition technology and sub-pixel positioning technology. Judging from the existing research, the research on the first two issues is relatively in-depth, and many theoretical models have been proposed. However, purely relying on endmember extraction technology and mixed pixel decomposition technology...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/00G06K9/62
CPCG06V20/13G06F18/23213
Inventor 吴尚蓉任建强陈仲新
Owner INST OF AGRI RESOURCES & REGIONAL PLANNING CHINESE ACADEMY OF AGRI SCI