Discrete Cosine Transform - Revision history

Speckmade at 17:29, 13 June 2007

2007-06-13T17:29:52Z

← Older revision		Revision as of 17:29, 13 June 2007
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	The Discrete Cosine Transform (DCT) is similar to the [[~~DFT\|~~Discrete Fourier Transform]]: It transforms a signal from the [[time domain]] into the [[frequency domain]]. And just as the fourier transform uses sine and cosine waves to represent a signal, the DCT only uses cosine waves. The DCT I and II, is mostly used in image compression, while [[MDCT]] (DCT-IV) is used in audio encoding.		The '''Discrete Cosine Transform''' ('''DCT''') is similar to the [[Discrete Fourier Transform]] ([[DFT]]): It transforms a signal from the [[time domain]] into the [[frequency domain]]. And just as the fourier transform uses sine and cosine waves to represent a signal, the DCT only uses cosine waves. The DCT I and II, is mostly used in image compression, while [[MDCT]] (DCT-IV) is used in audio encoding.

	The DCT is an invertible, discrete orthogonal transformation. An orthogonal transformation consists of multiply the inner products of corresponding vectors or matrixes (including measures for angles and lengths).		The DCT is an invertible, discrete orthogonal transformation. An orthogonal transformation consists of multiply the inner products of corresponding vectors or matrixes (including measures for angles and lengths).

Speckmade: DCT moved to Discrete Cosine Transform

2007-06-13T17:25:09Z

DCT moved to Discrete Cosine Transform

← Older revision	Revision as of 17:25, 13 June 2007
(No difference)

HotshotGG: Nobody in there right mind know's what the hell "orthogonal transform" is unless you are into linear algebra. Break it down more ;-D. On a burden of theoretical proof it's scary.

2006-07-27T06:27:24Z

Nobody in there right mind know's what the hell "orthogonal transform" is unless you are into linear algebra. Break it down more ;-D. On a burden of theoretical proof it's scary.

← Older revision		Revision as of 06:27, 27 July 2006
Line 1:		Line 1:
	The Discrete Cosine Transform (DCT) is similar to the [[DFT\|Discrete Fourier Transform]]: It transforms a signal from the [[time domain]] into the [[frequency domain]]. And just as the fourier transform uses sine and cosine waves to represent a signal, the DCT only uses cosine waves. The DCT I and II, is mostly used in image compression, while [[MDCT]] (DCT-IV) is used in audio encoding.		The Discrete Cosine Transform (DCT) is similar to the [[DFT\|Discrete Fourier Transform]]: It transforms a signal from the [[time domain]] into the [[frequency domain]]. And just as the fourier transform uses sine and cosine waves to represent a signal, the DCT only uses cosine waves. The DCT I and II, is mostly used in image compression, while [[MDCT]] (DCT-IV) is used in audio encoding.

	The DCT is an invertible, discrete orthogonal transformation.		The DCT is an invertible, discrete orthogonal transformation. An orthogonal transformation consists of multiply the inner products of corresponding vectors or matrixes (including measures for angles and lengths).

Reglib: cleanup

2006-07-26T07:43:50Z

cleanup

← Older revision		Revision as of 07:43, 26 July 2006
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	The DCT is similar to the Discrete Fourier Transform: It transforms a signal from the [[time domain]] into the [[frequency domain]]. ~~Just~~ as the fourier transform uses sine and cosine waves to represent a signal, the DCT only uses cosine waves. The DCT I and II, is mostly used in image compression, while [[MDCT]] (DCT-IV) is used in audio encoding. The DCT is an invertible, discrete orthogonal transformation.		The Discrete Cosine Transform (DCT) is similar to the [[DFT\|Discrete Fourier Transform]]: It transforms a signal from the [[time domain]] into the [[frequency domain]]. And just as the fourier transform uses sine and cosine waves to represent a signal, the DCT only uses cosine waves. The DCT I and II, is mostly used in image compression, while [[MDCT]] (DCT-IV) is used in audio encoding.

			The DCT is an invertible, discrete orthogonal transformation.

HotshotGG at 07:04, 20 July 2006

2006-07-20T07:04:47Z

← Older revision		Revision as of 07:04, 20 July 2006
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	The DCT is similar to the ~~discrete fourier transform~~: It transforms a signal from the [[time domain]] to the [[frequency domain]]. Just as the fourier transform uses sine and cosine waves to represent a signal, the DCT only uses cosine waves. ~~While~~ DCT is mostly used in image compression, [[MDCT]] (~~modified~~ DCT) is used in audio encoding. The DCT is an invertible, discrete orthogonal transformation.		The DCT is similar to the Discrete Fourier Transform: It transforms a signal from the [[time domain]] into the [[frequency domain]]. Just as the fourier transform uses sine and cosine waves to represent a signal, the DCT only uses cosine waves. The DCT I and II, is mostly used in image compression, while [[MDCT]] (DCT-IV) is used in audio encoding. The DCT is an invertible, discrete orthogonal transformation.

Jan at 21:25, 24 January 2005

2005-01-24T21:25:25Z

New page

The DCT is similar to the discrete fourier transform: It transforms a signal from the [[time domain]] to the [[frequency domain]]. Just as the fourier transform uses sine and cosine waves to represent a signal, the DCT only uses cosine waves. While DCT is mostly used in image compression, [[MDCT]] (modified DCT) is used in audio encoding. The DCT is an invertible, discrete orthogonal transformation.