Image and code data compression apparatus

摘要

In an image and code data compression apparatus for compressing the image data and further compressing the code data which are compressed from the image data, the apparatus includes: a dividing unit for receiving the image data and dividing them into a plurality of image data blocks; a transformation unit operatively connected to the dividing unit for performing an orthogonal transformation to the image data block and calculating transformation coefficients for every frequency component; a quantizing unit operatively connected to the transformation unit for quantizing the transformation coefficients which are calculated by the transformation unit by using a quantized threshold value which is set commonly to all image data, and calculating the quantized orthogonal transformation coefficients; a coding unit operatively connected to the quantizing unit for performing the variable length coding process for the quantized transformation coefficients which are calculated by the quantizing unit and outputting the code data which are compressed from the image data; a detecting unit operatively connected to at least one of above units for detecting the complexity of the image data block; and a deleting unit operatively connected to at least one of above units and the detecting unit for deleting the block image data having high complexity detected by the detecting unit.