Setting of a motion trigger level

A circuitry configured to set a motion trigger level to be used in detection of motion in a video stream depicting a scene, the circuitry comprising:

• a data receiver configured to receive data pertaining to a video stream depicting the scene, wherein each image frame of the video stream comprises multiple blocks of pixels;
• a scene divider configured to divide the scene into a plurality of specific portions, wherein each specific portion is associated with one or more block of pixels;
• a statistical feature evaluator configured to, for each specific portion of the scene, evaluate, over time, statistical features of bitrate associated with an encoding of block of pixels pertaining to the specific portion of the scene;
• a motion base level determinator configured to, for each specific portion of the scene, determine a motion base level based on the evaluated statistical features of the bitrate associated with the encoding of block of pixels pertaining to the specific portion of the scene;
• and
• a motion trigger level controller configured to, for each specific portion of the scene, set a motion trigger level based on the motion base level for the corresponding specific portion of the scene.

A non-transitory computer readable storing medium having stored thereon a program for implementing the following method, when executed on a device having processing capabilities:

• receiving data pertaining to a video stream depicting the scene;
• dividing the scene into a plurality of specific portions;
• wherein each image frame of the video stream comprises multiple blocks of pixels, wherein each specific portion of the scene is associated with one or more block of pixels;
• and
• for each specific portion of the scene:
• evaluating, over time, statistical features of bitrate associated with an encoding of block of pixels pertaining to the specific portion of the scene;
• determining a motion base level based on the evaluated statistical features of bitrate associated with the encoding of block of pixels pertaining to the specific portion of the scene;
• and
• setting a motion trigger level based on the motion base level.