| 摘要 |
Adaptive DCT/IDCT apparatus based on energy and method for controlling the same. The adaptive DCT/IDCT apparatus relates to a coding unit of a MPEG4/H.263 video coder, and performs an image processing operation with a high image quality at a high speed by calculating energy values for respective blocks and a mean energy value of the whole image. The apparatus includes an energy calculator for receiving an input image, dividing the input image into blocks of predetermined size, calculating energy values for respective blocks and a mean energy value, and comparing the energy values with the mean energy value; a DCT unit for dividing the input image into predetermined blocks, and performing a DCT operation on the divided blocks; an image coefficient processor for receiving DCT coefficients for respective blocks from the DCT unit according to a result of the comparison of the block's energy value and the mean energy value, and rearranging the DCT coefficients; and an IDCT unit for receiving rearranged DCT coefficients from the image coefficient processor, performing an IDCT operation on the rearranged DCT coefficients, and creating a restored image.
|
