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Pipelined discrete cosine transform apparatus

  • US 6,577,772 B1
  • Filed: 12/31/1998
  • Issued: 06/10/2003
  • Est. Priority Date: 12/23/1998
  • Status: Expired due to Fees
First Claim
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1. A two-dimensional (2D) discrete cosine transform (DCT) device comprising:

  • a first one-dimensional (1D) operator for executing a 1D DCT operation in rows for input image data;

    a transposition memory for temporarily storing resultant data of the first 1D DCT operator;

    a second 1D DCT operator for executing a 1D DCT operation in columns for the resultant data of the first 1D DCT operator and stored in the transposition memory;

    a control logic unit for controlling operation of the first and second 1D DCT operators and the transposition memory according to an external DCT block control signal; and

    a coding controller for controlling the external DCT block control signal according to information of quantized DCT coefficients.

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