US 12,456,302 B2
Conversation surveillance apparatus, control method, and computer readable medium
Junichi Funada, Tokyo (JP); and Hisashi Mizumoto, Tokyo (JP)
Assigned to NEC CORPORATION, Tokyo (JP)
Appl. No. 18/014,942
Filed by NEC Corporation, Tokyo (JP)
PCT Filed Jul. 8, 2020, PCT No. PCT/JP2020/026713
§ 371(c)(1), (2) Date Jan. 6, 2023,
PCT Pub. No. WO2022/009339, PCT Pub. Date Jan. 13, 2022.
Prior Publication US 2023/0260286 A1, Aug. 17, 2023
Int. Cl. G06V 20/52 (2022.01); G06V 20/40 (2022.01); G10L 25/57 (2013.01)
CPC G06V 20/53 (2022.01) [G06V 20/41 (2022.01); G10L 25/57 (2013.01)] 9 Claims
OG exemplary drawing
 
9. A non-transitory computer readable medium storing a program, the program causing a computer to execute:
detecting a plurality of persons who have a conversation within a predetermined distance in a surveillance area from video data;
performing a first determination to determine a duration of the conversation had by the plurality of persons;
putting the determined duration of the conversation in association with identification information of the plurality of persons into a storage device;
performing a second determination to determine whether or not a total duration of the conversations of the plurality of persons within a predetermined period of time is equal to or larger than a threshold using the information stored in the storage device; and
wherein the first determination includes determining the duration of the conversation had by the plurality of persons using audio data generated by a microphone provided in a mobile robot that moves in the surveillance area, and
wherein the identification information of the plurality of persons is defined using sound features of a voice of each of the plurality of persons; and
based on the total duration being larger than the threshold, outputting a countermeasure.