US 9,811,292 B2
Using image difference data to reduce data processing
Takashi Ezoe, Shiojiri (JP)
Assigned to Seiko Epson Corporation, Tokyo (JP)
Filed by Seiko Epson Corporation, Tokyo (JP)
Filed on Sep. 2, 2014, as Appl. No. 14/474,874.
Claims priority of application No. 2013-184768 (JP), filed on Sep. 6, 2013; and application No. 2014-068254 (JP), filed on Mar. 28, 2014.
Prior Publication US 2015/0077794 A1, Mar. 19, 2015
Int. Cl. G06F 3/12 (2006.01)
CPC G06F 3/1224 (2013.01) [G06F 3/122 (2013.01); G06F 3/1244 (2013.01); G06F 3/1284 (2013.01)] 7 Claims
OG exemplary drawing
 
1. An image processing device comprising:
a controller that calculates a value for each of a plurality of blocks of comparison image data and a value for each of a plurality of blocks of print image data, the calculated values being computed using a specific equation; and
a storage that stores identification information identifying tile comparison image data relationally to the calculated values:
wherein the controller compares the calculated values of the blocks in the print image data with the calculated values of the blocks in the comparison image data, and selects comparison image data with the fewest blocks having different calculated values, and
wherein the controller sends each block in the print image data having a calculated value different from the calculated value of the corresponding block in the selected comparison image data and the identification information for the selected comparison image data to a printing device.