Camera information handover

Patent metadata

Field	Value
Publication number	US-12401769-B2
Application number	US-202318464313-A
Country	US
Kind code	B2
Filing date	Sep 11, 2023
Priority date	Oct 3, 2022
Publication date	Aug 26, 2025
Grant date	Aug 26, 2025

Abstract

A system and method trigger a second camera in a camera system to perform an action prior to an object appearing in the field of view of the second camera. The camera system includes the second camera for which a location and a field of view is known, and at least a first device for which a location is known. The method comprises receiving, in the second camera, information indicating that the object is approaching the field of view of the second camera. The received information indicates a location and a direction of movement of the object, and, in response to the received information, triggers the second camera to action prior to the object appearing in the field of view of the second camera by: generating an intra frame or initiating an intra refresh procedure, adjusting one or more image processing parameters, or adjusting an exposure time.

First claim

The invention claimed is:

1. A method for triggering a second camera to perform one or more actions prior to an object appearing in the field of view of the second camera, wherein the second camera is arranged in a camera system including the second camera and at least a first device, and wherein a location and a field of view is known for the second camera and a location is known for the first device, the method comprising:
receiving, in the second camera, information indicating that the object is approaching the field of view of the second camera, wherein the field of view of the second camera has a plurality of subareas, and wherein the received information is based on information from the first device indicating a location and a direction of movement of the object, and
in response to the received information, determining, in the second camera, at least one subarea of the plurality of subareas of the field of view of the second camera in which the object is estimated to first appear and triggering the second camera to perform at least one of the following actions prior to the object appearing in the field of view of the second camera:
initiating an intra refresh procedure comprising intra encoding of a first portion of at least one image frame corresponding to one or more of the plurality of subareas, other than the at least one subarea, of the field of view of the second camera prior to intra encoding of a second portion of the least one image frame corresponding to the at least one subarea of the field of view of the second camera in which the object is estimated to first appear, or
adjusting one or more image processing parameters only in the second portion of the at least one image frame that corresponds to the at least one subarea of the field of view of the second camera in which the object is estimated to first appear.

2. The method of claim 1 , wherein the received information further indicates a time when the object is estimated to appear in the field of view of the second camera.

3. The method of claim 1 , wherein the received information further indicates the at least one subarea of the field of view of the second camera in which the object is estimated to first appear.

4. The method of claim 1 , further comprising generating, in the second camera, an I-frame before the object enters into the field of view of the second camera.

5. The method of claim 1 , wherein adjusting one or more image processing parameters is performed locally in the second portion of the at least one image frame that corresponds to the at least one subarea of the field of view of the second camera in which the object is estimated to first appear.

6. The method of claim 1 , wherein adjusting one or more image processing parameters comprises reducing low light noise filtering in the second portion of the at least one image frame that corresponds to the subarea of the field of view of the second camera in which the object is estimated to first appear.

7. The method of claim 1 , wherein adjusting one or more image processing parameters comprises one or more of:
setting the one or more image processing parameters to respective middle values as starting values for parameter optimization;
reducing a threshold for background segmentation; or
removing a division between background and foreground followed by identification of which portions of the at least one image frame belong to the background and which portions belong to the background when the object appears in the field of view of the second camera.

8. The method of claim 1 , wherein the received information further indicates a velocity of the object.

9. The method of claim 8 , wherein adjusting one or more image processing parameters comprises setting a temporal noise filter level based on the velocity of the object such that the higher the velocity, the higher the temporal noise filter level.

10. The method of claim 1 , further comprising, in response to the received information, triggering the second camera to further perform the following action prior to the object appearing in the field of view of the second camera:
adjusting an exposure time only in the second portion of the at least one image frame that corresponds to the at least one subarea of the field of view of the second camera in which the object is estimated to first appear.

11. The method of claim 10 , wherein the received information further indicates the at least one subarea of the field of view of the second camera in which the object is estimated to first appear, and wherein adjusting an exposure time comprises setting a shorter exposure time in the second portion of the at least one image frame that corresponds to the subarea of the field of view of the second camera in which the object is estimated to first appear than the first portion of the at least one image frame that corresponds to the plurality of subareas, other than the at least one subarea, of the field of view of the second camera.

12. The method of claim 10 , wherein the received information further indicates a velocity of the object, and wherein adjusting an exposure time is based on the velocity of the object such that the higher the velocity, the shorter the exposure time.

13. The method of claim 1 , wherein the first device is one of:
a first camera,
a radar, or
a lidar.

14. The method of claim 1 , wherein the first device is a first camera, wherein the received information further comprises color balance correction or white balance correction of the first camera, wherein adjusting one or more image processing parameters comprises setting color balance correction or white balance correction according to the received information.

15. A non-transitory computer-readable storage medium having stored thereon instructions for implementing a method when executed in a camera having at least a receiver, a processor, and an encoder, the method for triggering a second camera to perform one or more actions prior to an object appearing in the field of view of the second camera, wherein the second camera is arranged in a camera system including the second camera and at least a first device, and wherein a location and a field of view is known for the second camera and a location is known for the first device, the method comprising:
receiving, in the second camera, information indicating that the object is approaching the field of view of the second camera, wherein the field of view of the second camera has a plurality of subareas, and wherein the received information is based on information from the first device indicating a location and a direction of movement of the object, and
in response to the received information, determining, in the second camera, at least one subarea of the plurality of subareas of the field of view of the second camera in which the object is estimated to first appear and triggering the second camera to perform at least one of the following actions prior to the object appearing in the field of view of the second camera:
initiating an intra refresh procedure comprising intra encoding of a first portion of at least one image frame corresponding to the one or more of the plurality of subareas, other than the at least one subarea, of the field of view of the second camera prior to intra encoding of a second portion of the least one image frame corresponding to the at least one subarea of the field of view of the second camera in which the object is estimated to first appear, or
adjusting one or more image processing parameters only in the second portion of the at least one image frame that corresponds to the at least one subarea of the fie

Assignees

• Axis Ab

Inventors

• Keskikangas Axel
• Yuan Song
• Edpalm Viktor

Classifications

• H04N23/81

  for suppressing or minimising disturbance in the image signal generation · CPC title

• H04N23/88

  for colour balance, e.g. white-balance circuits or colour temperature control · CPC title

• H04N23/66

  Remote control of cameras or camera parts, e.g. by remote control devices · CPC title

• G06T2207/10044

  Radar image · CPC title

• G06T5/20

  using local operators · CPC title