Importance

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Abstract

The present invention relates to a DCT operator for compressing image data through dividing the image data into various frequency components by using a spatial correlation on a screen, particularly to be fit with a low-power required mobile video terminal. Therefore, the present invention provides a DCT operator, in which a range of DCT coefficients for a calculation is controllable among an entire DCT region, and also provides, in another embodiment, a 2D DCT device including a first 1D DCT operator for executing a 1D DCT operation in rows about input image data; a transposition memory for temporarily storing a result of the 1D DCT operator; a second 1D DCT operator for executing a 1D DCT operation in columns about the resultant data processed by the 1D DCT operation in rows and stored in the transposition memory; and a timing control logic unit for controlling operation of the first and second 1D DCT operators and the transposition memory according to a DCT block size control signal given from outside.

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First Claim