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公开(公告)号：US10311757B2
公开(公告)日：2019-06-04
申请号：US15444308
申请日：2017-02-27
Applicant: SHENZHEN UNIVERSITY
Inventor： Dongning Zhao , Yong Zhang , Weixin Xie , Yanshan Li , Jianping Yu , Jianyong Chen
Abstract: The invention relates to the technical field of data hiding, in particular to a data hiding method and a data hiding system. An image is used as a data carrier; after secret data is converted into a bit sequence by a sending end, the values of each bit in the bit sequence are hidden in the image; the image hidden with the secret data is obtained and is sent to a receiving end; and the receiving end can extract the hidden secret data from the image according to a corresponding secret key. During data hiding, each square image block can hide two-bit data through inverse number odd-even properties of a pixel gray value sequence of two diagonal lines of each square image block, so that the volume of data hidden in the image is twice of the number of the image blocks split by the image.
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公开(公告)号：US20180322604A1
公开(公告)日：2018-11-08
申请号：US15571857
申请日：2016-07-13
Applicant: SHENZHEN UNIVERSITY
Inventor： Dongning Zhao , Yong Zhang , Shengli Zhang , Yong Xu , Jianyong Chen , Yanshan Li
IPC: G06T1/00
CPC classification number: G06T1/0021 , G06T1/0028 , G06T2201/0051 , G06T2201/0061 , G06T2201/0065 , H04N21/8358
Abstract: The disclosure provides a digital video content security authentication method, wherein the method comprises: a secret information embedding step of selectively modifying a pixel grayscale value for each frame image in a digital video so as to complete the embedding of 1-bit secret information; and a secret information extraction and video authentication step of carrying out secret information extraction from the digital video in which the secret information is embedded according to a key so as to realize the security authentication of the digital video content. The disclosure also provides a digital video content security authentication system. According to the technical scheme provided by the disclosure, the authentication security is improved on the basis of not influencing user experience.
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3.发明授权公开(公告)号：US10650249B2
公开(公告)日：2020-05-12
申请号：US15687422
申请日：2017-08-25
Applicant: SHENZHEN UNIVERSITY
Inventor： Yong Zhang , Lei Liu , Zehong Chen , Dongning Zhao , Jianyong Chen , Yanshan Li
Abstract: The present disclosure provides a method and device for counting pedestrians. The method comprises: reading a pedestrian depth image, and comparing the pedestrian depth image and a pre-acquired environmental mean image to acquire a foreground image; dividing the foreground image into a plurality of regions, detecting whether or not there is a step in an edge pixel point of each region, and detecting whether or not the region surface formed in each region coincides with the curved surface of the head top; determining that the currently detected region is the region of the head top when there is a step in the point and when the region surface coincides with the curved surface; and counting and outputting the number of pedestrians according to the region of the head top determined from the pedestrian depth image and the region of the head top determined from an adjacent pedestrian depth image.
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公开(公告)号：US10445567B2
公开(公告)日：2019-10-15
申请号：US15832715
申请日：2017-12-05
Applicant: SHENZHEN UNIVERSITY
Inventor： Yong Zhang , Lei Liu , Zehong Chen , Dongning Zhao , Yanshan Li
Abstract: The disclosure provides a pedestrian head identification method and a pedestrian head identification system. The method comprises the following steps of: S1: collecting a depth image of a target region, and extracting a foreground image from the depth image; S2: extracting all Regions of Interest (ROI) from the foreground image; and S3: constructing concentric circles with each pixel point in each ROI region as a center to calculate a probability that the current pixel point belongs to the pixel points in a head region, obtaining the probability value of each pixel point in each ROI region, comparing the probability value of each pixel point in each ROI region with a preset first threshold, and filtering the pixel points with the probability value smaller than the first threshold, wherein the rest pixel points existent in regional form are points of the head region, and each region is an identified head.
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公开(公告)号：US10223597B2
公开(公告)日：2019-03-05
申请号：US15628605
申请日：2017-06-20
Applicant: SHENZHEN UNIVERSITY
Inventor： Yong Zhang , Lei Liu , Dongning Zhao , Yanshan Li , Jianyong Chen
Abstract: The disclosure provides a method for calculating a passenger crowdedness degree, comprising: establishing a video data collection environment and starting collecting video data of passengers getting on and off; reading the collected video data of passengers getting on and off and pre-processing a plurality of successive image frames of the video data; identifying a human head according to the pre-processing result and taking the detected human head as a target object to be tracked by mean-shift; and judging the behaviors of getting on and off of a passenger in the area where the target object is positioned and determining the crowdedness degree of passengers inside a vehicle according to the numbers of the passengers getting on and off. The disclosure also provides a system for calculating a passenger crowdedness degree. The disclosure can effectively reduce the false detection, leak detection and error detection of the head top.
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Patent Agency Ranking
公开(公告)号：US20180181803A1
公开(公告)日：2018-06-28
申请号：US15832715
申请日：2017-12-05
Applicant: SHENZHEN UNIVERSITY
Inventor： Yong Zhang , Lei Liu , Zehong Chen , Dongning Zhao , Yanshan Li
CPC classification number: G06K9/00369 , G06K9/00234 , G06K9/00778 , G06K9/3241 , G06T7/11 , G06T7/136 , G06T7/194 , G06T7/246 , G06T2207/10016 , G06T2207/10028 , G06T2207/30196
Abstract: The disclosure provides a pedestrian head identification method and a pedestrian head identification system. The method comprises the following steps of: S1: collecting a depth image of a target region, and extracting a foreground image from the depth image; S2: extracting all Regions of Interest (ROI) from the foreground image; and S3: constructing concentric circles with each pixel point in each ROI region as a center to calculate a probability that the current pixel point belongs to the pixel points in a head region, obtaining the probability value of each pixel point in each ROI region, comparing the probability value of each pixel point in each ROI region with a preset first threshold, and filtering the pixel points with the probability value smaller than the first threshold, wherein the rest pixel points existent in regional form are points of the head region, and each region is an identified head.
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公开(公告)号：US10354353B2
公开(公告)日：2019-07-16
申请号：US15571857
申请日：2016-07-13
Applicant: SHENZHEN UNIVERSITY
Inventor： Dongning Zhao , Yong Zhang , Shengli Zhang , Yong Xu , Jianyong Chen , Yanshan Li
IPC: G06K9/00 , G06T1/00 , H04N21/8358
Abstract: The disclosure provides a digital video content security authentication method, wherein the method comprises: a secret information embedding step of selectively modifying a pixel grayscale value for each frame image in a digital video so as to complete the embedding of 1-bit secret information; and a secret information extraction and video authentication step of carrying out secret information extraction from the digital video in which the secret information is embedded according to a key so as to realize the security authentication of the digital video content. The disclosure also provides a digital video content security authentication system. According to the technical scheme provided by the disclosure, the authentication security is improved on the basis of not influencing user experience.
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8.发明申请公开(公告)号：US20180114073A1
公开(公告)日：2018-04-26
申请号：US15687422
申请日：2017-08-25
Applicant: SHENZHEN UNIVERSITY
Inventor： Yong Zhang , Lei Liu , Zehong Chen , Dongning Zhao , Jianyong Chen , Yanshan Li
CPC classification number: G06K9/00778 , G06K9/00369 , G06T7/11 , G06T7/12 , G06T7/181 , G06T7/187 , G06T7/194 , G06T2207/10028 , G06T2207/20156 , G06T2207/20168 , G06T2207/30196 , G06T2207/30232 , G06T2207/30242
Abstract: The present disclosure provides a method and device for counting pedestrians. The method comprises: reading a pedestrian depth image, and comparing the pedestrian depth image and a pre-acquired environmental mean image to acquire a foreground image; dividing the foreground image into a plurality of regions, detecting whether or not there is a step in an edge pixel point of each region, and detecting whether or not the region surface formed in each region coincides with the curved surface of the head top; determining that the currently detected region is the region of the head top when there is a step in the point and when the region surface coincides with the curved surface; and counting and outputting the number of pedestrians according to the region of the head top determined from the pedestrian depth image and the region of the head top determined from an adjacent pedestrian depth image.
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公开(公告)号：US20170286780A1
公开(公告)日：2017-10-05
申请号：US15628605
申请日：2017-06-20
Applicant: SHENZHEN UNIVERSITY
Inventor： Yong Zhang , Lei Liu , Dongning Zhao , Yanshan Li , Jianyong Chen
CPC classification number: G06K9/00778 , G06K9/00624 , G06K9/00832 , G06K9/4614 , G06K9/4652 , G06K9/6257 , G06K2009/3291 , G06T7/215 , G06T2207/30201 , G06T2207/30242 , G06T2207/30252
Abstract: The disclosure provides a method for calculating a passenger crowdedness degree, comprising: establishing a video data collection environment and starting collecting video data of passengers getting on and off; reading the collected video data of passengers getting on and off and pre-processing a plurality of successive image frames of the video data; identifying a human head according to the pre-processing result and taking the detected human head as a target object to be tracked by mean-shift; and judging the behaviours of getting on and off of a passenger in the area where the target object is positioned and determining the crowdedness degree of passengers inside a vehicle according to the numbers of the passengers getting on and off. The disclosure also provides a system for calculating a passenger crowdedness degree. The disclosure can effectively reduce the false detection, leak detection and error detection of the head top.
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公开(公告)号：US20170169736A1
公开(公告)日：2017-06-15
申请号：US15444308
申请日：2017-02-27
Applicant: SHENZHEN UNIVERSITY
Inventor： Dongning Zhao , Yong Zhang , Weixin Xie , Yanshan Li , Jianping Yu , Jianyong Chen
IPC: G09C1/00
CPC classification number: G09C1/00 , G09C5/00 , H04L2209/16
Abstract: The invention relates to the technical field of data hiding, in particular to a data hiding method and a data hiding system. An image is used as a data carrier; after secret data is converted into a bit sequence by a sending end, the values of each bit in the bit sequence are hidden in the image; the image hidden with the secret data is obtained and is sent to a receiving end; and the receiving end can extract the hidden secret data from the image according to a corresponding secret key. During data hiding, each square image block can hide two-bit data through inverse number odd-even properties of a pixel gray value sequence of two diagonal lines of each square image block, so that the volume of data hidden in the image is twice of the number of the image blocks split by the image.
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