63fb46d6_bster_US___Patent_applications__Description
[Patent application number] 20100046034 [Published] 02-25-2010 [Description] 
Reformatting Binary Image Data to Generate Smaller Compressed Image Data Size - In various exemplary embodiments, systems include a segmentor to segment text binary image data to a first plane. A subtractor subtracts text binary image from binary image data to generate a non-text binary image data in a second plane. A converter converts non-text binary image data in the second plane into non-text gray scale image data in the second plane. A first compressor compresses the text gray scale image data in the first plane. A second compressor compresses the non-text gray scale mage in the second plane.
Xing Li, Webster US - Patent applications