Name

---

    DCT_BLOCK

Purpose

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    This function produces a block DCT image (or its inverse) from the
    provided input data.

Category

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    Image Processing.

Calling Sequence

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    Result = DCT_BLOCK( image, blockDimension, INVERSE=inverse )

Inputs

---

    image
      A two-dimensional array containing the data to be block DCT
      transformed.
    blockDimension
      A scalar describing the dimension of the square DCT blocks that are
      to be formed in the image.

Keyword Parametrs

---

    INVERSE
      A keyword parameter that if set will cause the provided image data
      to be treated as block DCT coefficients and cause the function to
      perform an inverse transformation to provide the spatial domain
      representation of the data.

Return Value

---

    Result is a double precision, floating point array containing either the
    block DCT or its inverse for the provided data.

Side Effects

---

    None

Requires

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    DCT2D

Modification History

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    Written by: Carl Salvaggio
    February, 2009 Original code
   

Disclaimer

---

    This source code is provided "as is" and without warranties as to performance
    or merchantability. The author and/or distributors of this source code may
    have made statements about this source code. Any such statements do not
    constitute warranties and shall not be relied on by the user in deciding
    whether to use this source code.
    This source code is provided without any express or implied warranties
    whatsoever. Because of the diversity of conditions and hardware under which
    this source code may be used, no warranty of fitness for a particular purpose
    is offered. The user is advised to test the source code thoroughly before
    relying on it. The user must assume the entire risk of using the source code.