Patent ID: 7537305
Filing Date: 2009-05-26
Classification: B41J

Abstract:
1. An image recording apparatus, comprising: a recording head which has a plurality of recording elements; a conveyance device which causes the recording head and a recording medium to move relatively to each other by conveying at least one of the recording head and the recording medium; a characteristic information acquisition device which acquires information that indicates recording characteristics of the recording elements, the recording characteristics including recording position errors of the recording elements and errors in volume of droplets ejected from the recording elements; a correction range setting device which sets N correction recording elements (where N is an integer larger than 1) for use in correction of output density, from among the plurality of recording elements; a correction coefficient specification device which specifies density correction coefficients for the N correction recording elements according to correction conditions including conditions where a differential coefficient at a frequency origin point (f=0) in a power spectrum representing spatial frequency characteristics of a density non-uniformity caused by the recording characteristics of at least one of the recording elements becomes substantially zero; a correction processing device which performs calculation for correcting the output density by using the density correction coefficients specified by the correction coefficient specification device; and a drive control device which controls driving of the recording elements according to correction results produced by the correction processing device.