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Method and system for obtaining image local features

A local feature and image acquisition technology, which is applied in computer parts, instruments, character and pattern recognition, etc., can solve the problems of complex image local feature extraction methods and incomplete reflection of image local characteristics.

Active Publication Date: 2015-01-28
SUZHOU KEDA TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] For this reason, the technical problem to be solved by the present invention is that the image local feature extraction method in the prior art is too complicated or cannot fully reflect the local characteristics of the image, so a method for obtaining image local features that is simple and can fully reflect the local features is proposed. method and system

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  • Method and system for obtaining image local features
  • Method and system for obtaining image local features

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Embodiment 1

[0078] This embodiment provides a method for obtaining local features of an image, such as figure 1 shown, including the following steps:

[0079] S1: Get the image to be processed, which is the current input image.

[0080] S2: Determine at least one rectangular image block in the image to be processed.

[0081] In this embodiment, a rectangular image block is determined in the image to be processed, the central pixel coordinates of the rectangular image block are (p, q), the size of the rectangular image block is A×B, and A and B satisfy The following conditions:

[0082]

[0083] Wherein A is the height of the rectangular image block, B is the width of the rectangular image block, s is a scale factor, and s is an integer not less than 1.

[0084] S3: Divide the rectangular image block into multiple rectangular sub-image blocks.

[0085] Divide the rectangular image block into 2 m The same rectangular sub-image block Isub(i), i=1~2 m , i is an integer, m is an integ...

Embodiment 2

[0134] This embodiment provides a system for acquiring local features of an image, such as Figure 5 shown, including:

[0135] The image acquisition module 1 is used to acquire images to be processed.

[0136] The partial image acquisition module 2 is configured to determine at least one rectangular image block in the image to be processed.

[0137] An image block module 3, configured to divide the rectangular image block into a plurality of rectangular sub-image blocks.

[0138] The eigenvector component acquisition module 4 is used to calculate the eigenvector components at different scales for each rectangular sub-image block.

[0139] The image local feature vector acquisition module 5 is used to arrange all the feature vector components to obtain the image local feature vector.

[0140] The size of the rectangular image block in the local image acquisition module 2 is A×B, and A and B satisfy the following conditions:

[0141]

[0142] Wherein A is the height of t...

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Abstract

The invention provides a method and system for obtaining image local features. At least one rectangular image block is determined after an image to be processed is obtained, then the rectangular image block is segmented into multiple rectangular sub-image blocks, feature vector components of each rectangular sub-image block in different scales are calculated, and all the obtained feature vector components are sequenced to obtain final image local feature vectors. Multi-scale segmented image local feature analysis and extraction are adopted, the obtained image local feature vectors have high anti-noise performance and robustness to scale transform, and the method is simple and can completely present the image local features. When the feature vector components are calculated, the feature vector components are divided by the average gray value of the local rectangular image block, and the finally obtained image local feature vectors have certain illumination change resistance. The whole calculation process is simple, and the method is suitable for being used for processing of real-time video images.

Description

technical field [0001] The invention relates to the technical field of digital image, that is, video processing, and in particular to a method and system for acquiring local features of an image. Background technique [0002] In a variety of multimedia processing systems involving display devices, the analysis and extraction of local features of images play an important role in a series of algorithms and technologies such as motion estimation, noise reduction, super-resolution reconstruction, fusion, moving object tracking, and stereo vision of images and videos. play a decisive role. Compared with the overall features of the image, the local features of the image mark the important areas in the image, and the image information is represented by these areas, which can save the calculation amount of the application while representing the important local information of the image. Image local features have the characteristics of good discrimination, high reproducibility, stron...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/46
CPCG06V10/48
Inventor 叶健晋兆龙陈卫东
Owner SUZHOU KEDA TECH
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