12 results about "Discrete cosine transform" patented technology

A discrete cosine transform (DCT) expresses a finite sequence of data points in terms of a sum of cosine functions oscillating at different frequencies. This is the standard data compression technique widely used by most digital media standards, for image compression (e.g. JPEG and HEIF, where small high-frequency components can be discarded), video coding (e.g. MPEG and H.26x), digital audio (e.g. MP3 and AAC) and digital television (e.g. SDTV and HDTV). DCTs are also important to numerous applications in science and engineering, such as spectral methods for the numerical solution of partial differential equations.