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Object type identification method combining plurality of interest point testers

An interest point detection and interest point technology, applied in the fields of image understanding, computer vision, and pattern recognition, can solve problems such as poor robustness, complex model, and excessive supervision, achieving good average effect, simple practice, and reduced supervision. Effect

Inactive Publication Date: 2012-07-25
JIANGXI UNIV OF SCI & TECH
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Problems solved by technology

[0009] In order to solve the problems of overly complex models, overly strong supervision and poor robustness in traditional object class recognition, the present invention provides a method for using dictionary collectives to parallelly utilize multiple information existing in images to identify object classes

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  • Object type identification method combining plurality of interest point testers

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[0038] Resize the images so that each image contains approximately 40,000 pixels (aspect ratio preserved). Because the SIFT descriptor is the most popular and effective descriptor, and most existing related methods use 128-dimensional SIFT vectors to describe interest points. So preferred embodiments also use it to delineate points of interest. Each time 60% of the images are selected to form a new training subset. 60 interest points are randomly selected from each image, and k-means is used to construct a visual dictionary of members. Because of the inherent randomness of the k-means algorithm, it is equivalent to using different clusterers when forming different member dictionaries. In most studies related to the “bag-of-words” model, the size of the visual dictionary is between 100 and 1000, so this parameter is set to a middle value of 500. Linear SVM (Support Vector Machine) learns a classifier based on the quantized vector set of each member dictionary. This process ...

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Abstract

The invention belongs to the technical field of mode identification, computer vision and image understanding and discloses an object type identification method combining a plurality of interest point testers. The method disclosed by the invention comprises the following steps of: firstly, extracting an interest point containing various shapes, edge outline and gray information through different interest point testers, so as to form different expression vectors of an image. A visual dictionary set can be obtained based on different interest point sets, and each member utilizes one different image characteristic. A classifier set is obtained based on the generated visual dictionary set, so as to create an object type cognitive model and a model learning method to adapt to the selecting characteristics according to the current identification task. As shown in a test, the method can combine information detected by different interest point testers and capture different characteristics of the image so as to effectively improve the performance of the traditional object type identification method based on a single visual dictionary.

Description

technical field [0001] The invention belongs to the technical fields of pattern recognition, computer vision and image understanding, and in particular relates to an object class recognition method. Background technique [0002] Object class recognition is a key problem in the field of computer vision. Object class models must handle the balance between intra-class variation and inter-class similarity. Humans can easily recognize many object classes, but for computers and robots, this task is extremely challenging. At the object class level, changes in lighting conditions, geometric deformations, occlusions, and background noise all pose many challenges for effective learning and robust recognition. In addition, object class recognition has to overcome the great differences between different instances within the class. [0003] An image contains a lot of information, how to characterize an image so that it can be effectively and efficiently used for recognition. This pro...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/62
Inventor 罗会兰井福荣张彩霞
Owner JIANGXI UNIV OF SCI & TECH
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