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A trademark image recognition method

An image recognition and trademark technology, applied in the field of visual target detection and recognition, can solve the problem of no false matching elimination method, no filtering, etc., to achieve the effect of fast recognition, elimination of false matching, and reduction of time complexity

Active Publication Date: 2019-01-18
PEKING UNIV
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  • Summary
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] To sum up, there are two deficiencies in the existing trademark recognition technology: one is that there is no false match elimination method that is robust to image affine transformation and missing key points; A method that can effectively filter those key points that are not related to the trademark

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Embodiment Construction

[0027] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific examples.

[0028] The present invention is a trademark image recognition method, and its technical process is as follows: figure 1 with figure 2 As shown, it specifically includes the following steps:

[0029] (1) Prepare positive samples and extract visual features

[0030] Prepare a certain number of training samples for each trademark to be recognized, and extract a local feature from these training samples, such as SIFT feature or SURF feature, and then cluster and quantify the extracted features to obtain the visual word representation of key points , as shown in Formula 1:

[0031] Formula 1: k={P(k), S(k), I(k)}

[0032] Among them, k represents the kth key point, P(k) represents the position, S(k) represents the scale, and I(k) represents the nearest cluster center.

[0033] (2) Feature selection based on mutual information

[0034] ...

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Abstract

The invention provides a trademark image recognition method, which includes the following steps: preparing a training sample of a trademark to be recognized, extracting its local features and performing clustering and quantification; using mutual information to perform feature selection; extracting the same part of the test image as the training sample features, and use the previously obtained clustering center to quantify the local features; use the features retained by feature selection to filter the key points of the test picture, and then match the key points between the test picture and the positive sample; use the spatial topological relationship to match. Constraints, remove incorrectly matched key point pairs, and count the number of different visual words in the matching point pairs as the similarity between the test image and the positive sample; determine whether the test image contains the trademark according to the similarity. The present invention considers two aspects of filtering irrelevant feature points and eliminating wrong matches, which are complementary and can promote each other, thereby better improving the accuracy of trademark recognition.

Description

technical field [0001] The invention belongs to the technical field of visual target detection and recognition, and in particular relates to a trademark image recognition method. Background technique [0002] In recent years, with the rapid development and popularization of Internet technology, especially the continuous promotion and application of social networking sites, images on the Internet have shown a rapid growth trend, which makes online media the most potential advertising and business platform. Brand tracking is a service that has emerged in recent years. It evaluates brand growth by analyzing the frequency of brand exposure in the media and user evaluations. There are two traditional analysis methods. One is to rely on manual analysis and statistics. Due to the huge amount of online media, this method requires a lot of manpower and time; the second method is to retrieve relevant information through the keyword search function of the website. However, the keyword...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/62
CPCG06F18/23
Inventor 唐攀攀彭宇新
Owner PEKING UNIV
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