Method for detecting head and shoulders of pedestrian in video based on overhead pixel gradient direction

A technology of gradient direction and detection method, applied in the field of pedestrian head and shoulder detection in video, can solve the problems of low efficiency, low precision and high missed detection rate, and achieve the effect of improving accuracy, solving low efficiency and improving efficiency

Active Publication Date: 2013-09-18
TAIYUAN UNIV OF TECH
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Problems solved by technology

[0005] In order to solve the problems of low efficiency, high missed detection rate and low precision in the existing video pedestrian detection method, the present invention provides a pedestrian head and shoulder detection method based on the gradient direction of the top pixel point in the video

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  • Method for detecting head and shoulders of pedestrian in video based on overhead pixel gradient direction
  • Method for detecting head and shoulders of pedestrian in video based on overhead pixel gradient direction
  • Method for detecting head and shoulders of pedestrian in video based on overhead pixel gradient direction

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Embodiment Construction

[0037] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0038] Figure 4 It is a frame of image in a video shot by a camera, the frame rate of the video is 25f / s (frame / second), and the resolution is 320×240.

[0039] A pedestrian head and shoulder detection method based on the gradient direction of the top pixel point in a video, comprising the following steps:

[0040] (1) In the training sample, extract the HOG feature of the head and shoulders sample and the HSV color feature of the head sample, and use the SVM machine learning classifier to train and generate the head and shoulders SVM classifier, as follows:

[0041] The training samples required to train the classifier come from the publicly available MIT and INRIA pedestrian databases (http: / / cbcl.mit.edu / software-datasets / PedestrianData.html, http: / / pascal.inrialpes.fr / data / human) . The head and shoulders and the head of pedestrians are...

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Abstract

The invention relates to the technical field of video image processing, in particular to a method for detecting the head and the shoulders of a pedestrian in a video, and solves the problems of inefficiency, high undetected rates and low accuracy existed in a conventional method for detecting the pedestrian in the video. The method for detecting the head and the shoulders of the pedestrian in the video based on an overhead pixel gradient direction includes subjecting a scene in the video to background modeling by adopting an averaging method, and extracting a front scene of a video image; finding out an overhead candidate point by utilizing an feature that the overhead pixel gradient direction is provided with a fixed range, calculating sizes and locations of the head and the shoulders as a to-be-detected window of the head and the shoulders of the pedestrian according to a coordinate of the overhead candidate point; extracting an HOG (histogram of oriented gradient) feature and an HSV (hue, saturation, value) color feature and inputting the same into a classifier to detect whether the to-be-detected window is about the head and the shoulders of the pedestrian or not, so that the undetected rates caused by the fact that the pedestrian's body is blocked is reduced.

Description

technical field [0001] The invention relates to the technical field of video image processing, in particular to a method for detecting the head and shoulders of a pedestrian in a video. Background technique [0002] Pedestrian detection in video surveillance scenes plays an important role in assisted driving, security monitoring, passenger flow statistics, etc., because pedestrian detection is the basis of important technologies such as tracking and recognition. Due to the problems of different postures of pedestrians, occlusion of the human body, sudden changes in illumination, and disturbance of the background environment in practical application scenarios, how to quickly and accurately detect pedestrians in videos with complex backgrounds is still a focus and difficulty in the field of video image processing technology. . [0003] Existing video pedestrian detection methods are mainly divided into three aspects: based on motion information, based on model matching and ba...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G06K9/62
Inventor 谢刚阎高伟赵哲峰谢珺钦爽饶钦
Owner TAIYUAN UNIV OF TECH
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