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Face detection method and device adopting cascade classifier

A cascade classifier and face detection technology, applied in the field of face detection technology, can solve the problems of slow detection speed of the face detector, inability to achieve real-time detection, difficult face detection, etc., and achieve real-time face detection, The effect of easy convergence and strong distinguishing ability

Active Publication Date: 2011-07-20
HANGZHOU HIKVISION DIGITAL TECH
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Problems solved by technology

[0005] That is to say, for each window to be detected, the cascade structure classifier must calculate the results of all weak classifiers in a strong classifier before removing some non-faces, and an image often contains a large number of windows to be detected , so when the video resolution is higher, or even two million high-definition, the effect of real-time detection cannot be achieved
Further, in the case of extending the frontal face to the quasi-frontal face (that is, a face whose out-of-plane rotation does not exceed 60°), due to the more diverse training samples, the convergence speed in the iterative training process is slower during the training process using Haar-like features. , the detection speed of the final face detector is also slower, and it is more difficult to achieve quasi-frontal face detection

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Embodiment Construction

[0030] In the following description, many technical details are proposed in order to enable readers to better understand the application. However, those skilled in the art can understand that without these technical details and various changes and modifications based on the following implementation modes, the technical solution claimed in each claim of the present application can be realized.

[0031] In order to make the purpose, technical solution and advantages of the present invention clearer, the following will further describe the implementation of the present invention in detail in conjunction with the accompanying drawings.

[0032] The first embodiment of the present invention relates to a face detection method using cascaded classifiers. In this embodiment, positive samples and negative samples need to be prepared in advance for training the cascade structure classifier and the light cascade structure classifier. For convenience of description, each level of the tra...

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Abstract

The invention discloses a face detection method and device adopting a cascade classifier, relating to the field of video monitoring. The face detection method comprises the following step of: carrying out face detection on rectangular windows with different positions and sizes in a current image to be detected by adopting a light type cascade-structure classifier to detect face windows, wherein each level of the light type cascade-structure classifier is a weak classifier. For a large quantity of windows to be detected in one image, relative to a scheme that a cascade-structure classifier is bound to eliminate partial non-faces after computing the results of all weak classifiers of a strong classifier, each weak classifier of the light type cascade-structure classifier can eliminate the partial non-faces, and therefore faster detection speed can be achieved, and the real-time detection of faces is further realized on megapixel high-definition videos.

Description

technical field [0001] The invention relates to the field of video monitoring, in particular to face detection technology in the field of video monitoring. Background technique [0002] With the improvement of security requirements, the commercial value of technologies such as people flow statistics, personnel feature recognition, and face recognition have begun to emerge, and they have gradually begun to be applied. Face detection, as the primary link of these tasks, has a very important role and significance , in recent years, researchers have invested a lot of time and energy in this field, devoting themselves to developing a fast and accurate face detection method. [0003] The method based on neural network is a very successful method in the earliest period of face detection, and its detection effect is very good, but the disadvantage is also very obvious: the detection speed is too slow. It was not until 2001 that Paul Viola et al. proposed the first real-time face de...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/66G06K9/00
Inventor 谭文明张文聪蔡巍伟浦世亮贾永华胡扬忠邬伟琪
Owner HANGZHOU HIKVISION DIGITAL TECH
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