PERSON SEARCH METHOD AND DEVICE FOR SEARCHING PERSON STAYING ON PLATFORM
First Claim
1. A person search method comprising the steps of:
- creating a database by detecting facial images in input images, extracting features from the facial images, and registering the features in the database together with time information;
specifying facial images which are detected automatically or specified manually from the input images as facial images to be determined;
searching the database created in the creating step for similar faces for limited time on a time axis;
calculating the number of cases with higher similarity than a predetermined value among search results of the searching step, and determining that the number of appearances is large and a possibility of a prowling person is high if the number of cases is large, and that the number of appearances is small and a possibility of prowling person is low if the number of cases is small; and
calculating similarity between a facial image of a pre-registered non-suspicious person and a facial image of a person whose appearance number is large, and re-determining that the person is not a suspicious person if the similarity is high, regardless of determination of the determining step.
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Abstract
Provided is a suspicious person detection method. First, a normal similar facial image search is carried out. Next, facial images, which are detected automatically from the input images and specified manually, are specified to be determined. Next, similar faces are searched for limited time on a time axis on the database. Next, the number of search results that distance between the features is lower than predetermined value is calculated and it is determined that the number of appearances is large and a possibility of a prowling person is high if the number of cases is large, and otherwise a possibility of prowling person is low. Last, a similarity between a facial image of a pre-registered residents and a facial image of a person whose number is large is calculated, and it is re-determined that the person is residents if the similarity is high, regardless of the determination.
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Citations
7 Claims
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1. A person search method comprising the steps of:
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creating a database by detecting facial images in input images, extracting features from the facial images, and registering the features in the database together with time information; specifying facial images which are detected automatically or specified manually from the input images as facial images to be determined; searching the database created in the creating step for similar faces for limited time on a time axis; calculating the number of cases with higher similarity than a predetermined value among search results of the searching step, and determining that the number of appearances is large and a possibility of a prowling person is high if the number of cases is large, and that the number of appearances is small and a possibility of prowling person is low if the number of cases is small; and calculating similarity between a facial image of a pre-registered non-suspicious person and a facial image of a person whose appearance number is large, and re-determining that the person is not a suspicious person if the similarity is high, regardless of determination of the determining step.
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2. A person search method comprising:
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a first step of receiving face detection data including time information and a feature extracted from a facial image detected from images of a plurality of cameras, and registering the face detection data in a first database and a second database depending on attributes of the cameras; a second step of grouping records of a same person by performing similarity search on at least one of the first database and the second database using, as a key, a face of one record which is registered in the first database and has undetermined estimated person ID, assigning an estimated person ID to the record used as a search key based on a predetermined first rule, and updating a white list retaining the assigned estimated person ID in association with a features thereof; a third step of detecting a suspicious person candidate by creating a suspicious person appearance list using the white list based on a predetermined second rule, and performing similarity search for a suspicious person list using, as a key, a face of face detection data newly registered in at least the second database; and a fourth step of adding at least a portion of the face detection data, used as a key in the third step, as appearance history to the suspicious person appearance list when the suspicious person candidate is detected, and determining whether or not the suspicious person candidate corresponds to a suspicious person based on a predetermined third rule from the appearance history retained in the suspicious person appearance list. - View Dependent Claims (3, 4, 5, 6)
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7. A device for searching a person staying on a platform comprising the steps of:
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creating a database by detecting facial images in input images from cameras for capturing a station platform, extracting features from the facial images, and registering the features in the database together with time information; searching for similar features, which are similar, on the database created in the creating step for a limited time on a time axis wider than a time period between arrival and departure of a train; determining whether or not a person is staying on the platform by comparison between the number of extractions obtained by the searching step and the number of registrations which allows a person to be expected as a staying person; registering the person who is determined as the staying person in a black list; and when a feature similar to the registered person is retrieved from the database, notifying that.
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Specification