Image Processing Apparatus And Image Forming Apparatus

An image forming apparatus, comprising;

• an image inputting unit configured to read an image and generate image data of the image;
• an input image processing unit configured to compress respective pieces of sub-band data of the image data to generate pieces of compressed sub-band data as compressed image data;
• an image storage unit configured to store the pieces of compressed sub-band data as the compressed image data;
• an image processing apparatus configured to read out the compressed image data from the image storage unit, perform image processing, and write the compressed image data for which the image processing has been performed to the image storage unit;
• an output image processing unit configured to decompress the compressed image data for which the image processing apparatus has performed the image processing;
• and
• an image outputting unit configured to output an image based on the image data obtained by the output image processing unit;
• wherein the image processing apparatus comprises:
• one or more image processing modules;
• a first work memory disposed in a previous position to the one or more image processing modules;
• a second work memory disposed in a next position to the one or more image processing modules;
• a decompression-rotation processing module configured to (a) read out and decompress plural pieces of the compressed sub-band data corresponding to plural sub-bands in plural band, the plural sub-bands locating at an identical position in a primary scanning direction, (b) rotate respective pieces of sub-band data obtained by decompressing the pieces of compressed sub-band data, and store the pieces of rotated sub-band data in the first work memory;
• and
• a rotation-compression processing module configured to (c) read out the plural pieces of sub-band data which the one or more image processing modules performed image processing for and stored in the second work memory and rotate the respective pieces of sub-band data, and (d) compress the respective pieces of rotated sub-band data.