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Measurement learning method and system for pedestrian re-recognition

A pedestrian re-identification and metric learning technology, applied in character and pattern recognition, instruments, computing and other directions, can solve problems such as overfitting, achieve good adaptability, strong generalization ability, and avoid overfitting.

Active Publication Date: 2017-07-04
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0003] The present invention proposes a metric learning method for pedestrian re-identification. The purpose is to provide a metric learning method that imposes single-threshold constraints on the feature vectors for positive samples and double-threshold constraints for negative samples on feature vectors. Overfitting problem in complex scenes

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Embodiment Construction

[0049] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0050] For the convenience of description, we set our data set to come from two cameras, where each pedestrian has only one image under one camera (this algorithm can be easily extended to multiple cameras and multiple images)

[0051] Such as figure 1 As shown, a metric learning method for pedestrian re-identification proposed by the present invention includes the following steps:

[0052] St...

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Abstract

The invention discloses a measurement learning method and system for pedestrian re-recognition. Implementation of the method comprises the steps of collecting feature vectors of a pedestrian target under two cameras, building a positive sample pair feature vector set and a negative sample pair feature vector set, calculating the distance of positive sample pair feature vectors and the distance of negative sample pair feature vectors, restraining the negative sample pair feature vectors by adopting dual thresholds, building a measurement matrix based loss function under distance constraint conditions of the positive and negative sample pair feature vectors, and iteratively updating the measurement matrix by taking the minimum loss function value as the target. The measurement learning method can effectively reduce influences imposed on matrix learning by irrelevant variables such as image background and noise, so that occurrence of an overfitting phenomenon is avoided, and the acquired measurement matrix is high in generalization ability.

Description

technical field [0001] The invention belongs to the technical field of pattern recognition, and more particularly relates to a metric learning method and system for pedestrian re-identification. Background technique [0002] Pedestrian re-identification algorithm is one of the important fields of image processing and pattern recognition research, focusing on the recognition of specific target pedestrians under cameras without public view. Due to limitations such as video clarity, it is difficult to find the same target through intuitive information such as faces. Instead, we focus on the feature expression based on the appearance of pedestrians, mainly including information such as the color and texture of pedestrian images, and then find a suitable measurement. The method makes the cross-camera features of the same pedestrian target as similar as possible, and the difference of heterogeneous target features is as significant as possible. Since the same target is affected b...

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Application Information

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IPC IPC(8): G06K9/00
CPCG06V40/103
Inventor 贺波涛余少华
Owner HUAZHONG UNIV OF SCI & TECH
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