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Information source variable single-pixel constraint ICA-based mixed pixel decomposition method

A technology of mixed pixel decomposition and mixed pixel, which is applied in the field of remote sensing image mixed pixel decomposition

Inactive Publication Date: 2010-06-16
BEIJING NORMAL UNIVERSITY
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Problems solved by technology

[0010] The purpose of the present invention is to solve two major problems in the field of mixed pixel decomposition: the problem of mixed pixel decomposition where the type of ground object is greater than the number of remote sensing image channels, and the accuracy problem caused by the fixed type of ground object in the linear model

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[0031] The variable constraint single-pixel ICA method of the information source that the present invention proposes, concrete steps are as follows: for dynamically adjusting the feature type (being information source) of the pixel to be decomposed, at first utilize the similarity of the mixed pixel and the pure pixel, Determine the type of ground objects contained in the mixed pixel to be decomposed, and then decompose in combination with the new ICA method proposed in the present invention: the single-pixel ICA method with constraints.

[0032] In the above method, the "dynamic adjustment of the feature type of the pixel to be decomposed" is as follows:

[0033] The traditional mixed pixel decomposition adopts a unified standard for each pixel, that is, the number of sources for each pixel is constant. But in fact, the information sources of different pixels may be different. According to the spectral response characteristics of the mixed pixel, the cross-correlation spectr...

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Abstract

The invention discloses an information source variable single-pixel constraint ICA-based mixed pixel decomposition method. The ICA is a common blind source separation method. As the constraint condition exists in the mixed pixel decomposition problem instead of other blind source separation problems, the ICA used in the mixed pixel decomposition problem cannot achieve good decomposition effect; at the same time, two problems exist in the field of the mixed pixel decomposition: how to solve the mixed pixel decomposition problem that the surface feature is greater than the number of remote sensing image channels and how to solve the precision problem brought by always fixed surface feature. In order to effectively solve the problem of the mixed pixel decomposition by using an ICA model and solve the two problems of the mixed pixel decomposition, the invention improves the traditional ICA, and provides a new method for the mixed pixel decomposition, namely an information source variable single-pixel constraint ICA method. Tests prove that the method can obtain a result superior to other decomposition methods.

Description

Technical field: [0001] The invention belongs to the technical field of remote sensing image mixed pixel decomposition, and in particular relates to a mixed pixel decomposition method based on constrained single-pixel ICA with variable information sources. Background technique: [0002] The limitation of sensor spatial resolution and the influence of complex and diverse surface features make mixed pixels commonly exist in various remote sensing images, especially for areas with complex distribution of ground features (refer to reference document 1). If we do not consider the influence of mixed pixels and consider them as pure pixels, it will inevitably lead to classification errors, resulting in a decrease in accuracy and not being able to reflect the real surface coverage. [0003] Among the existing mixed cell models, the linear model is by far the most popular and most used model. However, in the linear model, the types of ground object types decomposed by mixed pixels a...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/62
Inventor 余先川曹恒智张立保胡丹
Owner BEIJING NORMAL UNIVERSITY
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