Patent ID: 8384830

Claim:
A method for buffering an alarm video sequence, wherein the alarm video sequence comprises a pre-alarm video sequence showing the events before an alarm detection, comprising the acts of: receiving input image frames from an input video stream comprising full image frames and differential image frames, storing each received input image frame in a video sequence FIFO buffer in response to the receipt of each frame, and storing at least one full image frame, being related to the video sequence stored in the video sequence FIFO buffer, in a full image FIFO buffer, and generating, in response to the alarm detection, an output alarm video sequence by combining at least one of the full image frames stored in the full image FIFO buffer with the image frames of the video sequence FIFO buffer, wherein at least one of the combined full image frames was received prior to the alarm detection, and wherein said at least one full image frame stored in the full image frame FIFO buffer is a full image representation of an image frame having a short temporal distance to the oldest image frame of the video sequence stored in the video sequence FIFO buffer.