A mathematical operation that transforms a signal from the time domain to the frequency domain. In video compression, DCT transforms the video signal from the spatial domain to the frequency domain. This allows the video signal to be compressed more efficiently, as the signal’s frequency components are typically less important than the spatial components.
DCT is a lossy compression technique, meaning some information is lost during the compression process. However, the lost information is typically tiny, and the resulting video is still of high quality.
DCT is used in a variety of video compression standards, including:
- H.261
- H.262 (MPEG-2)
- H.264 (MPEG-4 Part 10 AVC)
- HEVC (H.265)
DCT is also used in a variety of other applications, such as:
- Audio compression
- Image compression
- Signal processing
- Data compression
DCT is a powerful mathematical tool that has a wide range of applications. It is used in a variety of video compression standards, as well as in a variety of other applications.