discrete cosine transform การใช้

• Representation is based on coefficients of the discrete cosine transform ( DCT ).
• See Welch method of power spectral analysis and the modified discrete cosine transform.
• The JPEG image format is an application of the closely related discrete cosine transform.
• Transform coding using an 8? discrete cosine transform ( DCT ) reduces the spatial redundancy.
• RAGE 128 added inverse discrete cosine transform ( IDCT ) acceleration to the DVD repertoire.
• The data in each block is transformed by the discrete cosine transform ( DCT ).
• This is typically a Karhunen-Lo鑦e transform, or a simplified approximation such as the discrete cosine transform.
• It is a pure transform codec based on the modified discrete cosine transform with a single block size.
• The best known example is the modified discrete cosine transform used in the MP3, Vorbis, Opus audio codecs.
• As the template Motion estimation ( ME ), Discrete cosine transform ( DCT ), and entropy encoding ( EC ).
• The most common variant of discrete cosine transform is the type-II DCT, which is often called simply " the DCT ".
• The algorithm is not based on the Discrete Cosine Transform, as any rounding errors would prevent the algorithm from being lossless.
• Fundamentally, WMA is a transform coder based on modified discrete cosine transform ( MDCT ), somewhat similar to mid / side coded.
• Mispredicted data and non-predicted blocks are compressed in a 4? pixel sub-block with a discrete cosine transform or a Walsh Hadamard transform.
• For MPEG-1, MPEG-2, and MPEG-4 / DivX videos, motion compensation and iDCT ( inverse discrete cosine transform ) will be done instead.
• An intraframe video compression scheme is used to compress video on a frame-by-frame basis with the discrete cosine transform ( DCT ).
• As another example, with appropriate normalization the discrete cosine transform ( used in MP3 compression ) is represented by an orthogonal matrix.
• These blocks can then be subjected to discrete cosine transform ( DCT ) to calculate the frequency components, both horizontally and vertically.
• Lapped transforms substantially reduce the blocking artifacts that otherwise occur with block transform coding techniques, in particular those using the discrete cosine transform.
• The higher layers encode the weighted error signal from the lower layers using overlap-add modified discrete cosine transform ( MDCT ) transform coding.