Patent ID: 8345999

Claim:
A method for compressing binary image data, comprising: using a computer, dividing the binary image into a plurality of bands, each of said bands having a plurality of blocks therein; using the computer determining an optimal compression technique for each of the blocks, and for adjacent blocks having a common optimal compression technique, recombining said blocks into a single block, and thereby segmenting the binary image data into high-frequency information regions and low frequency information regions; subtracting the high-frequency information regions and low frequency information regions from the segmented binary image data to produce at least a first binary data plane having high-frequency information and a second binary data plane having low frequency information; and separately compressing the first binary data plane and the second binary data plane using said computer and the optimal compression techniques, where both the first and second binary data planes are compressed using binary compression techniques and wherein at least one plane is compressed using a lossless binary compression technique to produce a mixed raster content output.