| 摘要 |
An image processing circuit for processing DCT coefficients includes an input latch (20) for receiving a DCT coefficient and associated coordinates. A multiplying stage (30) receives an unsigned value of the DCT coefficient and multiplies it by a number of DCT functions to produce a number of products. A decoder (50) provides control signals based on the coordinates and the sign of the DCT coefficient. A multiplexer (60) selects a number of pairs of the products in dependence upon the control signals. An accumulator (80) is arranged to store partial picture element values and adds or subtracts each element of the pair to a selected one of the partial picture element values in dependence upon the control signals. The image processing circuit can be adapted to process other transform functions e.g. discrete sine transform. |
