Camera information handover

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 field of view of the second camera in which the object is estimated to first appear.

A camera for performing at least one action prior to an object appearing in the field of view of the camera, the camera comprising:

• a receiver configured to, when the camera is arranged in a camera system including the camera and at least another device and a location and a field of view is known for the camera and a location is known for said another device, receive information indicating that the object is approaching the field of view of the camera, wherein the field of view of the camera has a plurality of subareas, and wherein the received information is based on information from said another device indicating a location and a direction of movement of the object;
• an encoder;
• and
• circuitry configured to execute:
• determining at least one subarea of the plurality of subareas of the field of view of the camera in which the object is estimated to first appear and
• a triggering function configured to, in response to the received information, trigger the camera to perform at least one of the following actions prior to the object appearing in the field of view of the 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 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 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.

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 subarea, 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 wherein the received information further indicates a subarea of the field of view of the second camera in which the object is estimated to first appear, 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 the following action prior to the object appearing in the field of view of the second camera:
• adjusting an exposure time comprising setting a shorter exposure time in a first portion of 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 a second 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.