Owning Palette: Transforms VIs
Requires: Full Development System
Computes the inverse Discrete Cosine Transform (DCT) of the input sequence DCT {X}. Wire data to the DCT {X} input to determine the polymorphic instance to use or manually select the instance.
Use the pull-down menu to select an instance of this VI.
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DCT {X} is the real input sequence. |
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X is the inverse DCT of DCT {X}. |
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error returns any error or warning from the VI. You can wire error to the Error Cluster From Error Code VI to convert the error code or warning into an error cluster. |
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DCT {X} is the real input sequence. |
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X is the inverse DCT of DCT {X}. |
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error returns any error or warning from the VI. You can wire error to the Error Cluster From Error Code VI to convert the error code or warning into an error cluster. |
If y represents the input sequence DCT {X}, the one-dimensional inverse DCT of y is defined as:
and
where N is the length of the input sequence DCT {X}, y(k) is the k-th element of DCT {X}, and x(n) is the n-th element of the output sequence X. This VI applies a fast inverse DCT algorithm instead of calculating the inverse DCT directly. LabVIEW implements this fast inverse DCT algorithm using an FFT technique.
If y represents the input matrix DCT {X}, the two-dimensional inverse DCT of y is defined as:
where M and N are the number of rows and columns, respectively, of DCT {X}. x(m,n) is the element of the output matrix X with row number m and column number n. y(u,v) is the element of the input matrix DCT {X} with row number u and column number v. This VI performs a two-dimensional inverse DCT using the following two steps:
Refer to the Image Compression with DCT VI in the labview\examples\Signal Processing\Transforms directory for an example of using the Inverse DCT VI.
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