Interkuvapakkaus

Interkuvapakkaus, also known as interframe compression, is a video compression technique that exploits temporal redundancy between consecutive frames in a video sequence. Instead of encoding each frame independently, interkuvapakkaus encodes a subset of frames, called intra-frames or key frames, in their entirety. Subsequent frames, known as inter-frames, are then encoded by referencing these intra-frames and only storing the differences or motion vectors that describe how the content has changed from one frame to the next. This approach significantly reduces the amount of data required to represent the video, as most frames contain only minor variations from previous ones.

The effectiveness of interkuvapakkaus relies on the assumption that motion within a video is often predictable. Algorithms analyze blocks of pixels in a frame and search for similar blocks in a reference frame. If a match is found, only the displacement (motion vector) is encoded, along with any residual differences in the block. This motion compensation is a core element of interkuvapakkaus.

Interkuvapakkaus is widely used in video compression standards such as MPEG (Moving Picture Experts Group) and H.26x series. It is crucial for efficient storage and transmission of video data, enabling applications like video streaming, video conferencing, and digital broadcasting. The trade-off is increased complexity in encoding and decoding due to the need for motion estimation and compensation.