Halftone Technology for Improving Density Robustness Against Misregistration

Abstract

In a previous paper, we reported that we have newly developed a robustness-enhancing halftone technology that can dramatically improve the significant graininess deterioration caused by the misregistration between reciprocating scans of an inkjet printer. As a result, the problem of graininess deterioration was solved, but on the other hand, the problem of density fluctuation due to the same cause remains, which causes a fatal problem of image quality such as density unevenness in the cockle generating area. Therefore, as a result of aiming to solve this problem, we found that the density fluctuation can be significantly reduced by setting the probability that both of a pair of short-distance pixels become dot-on as the square of the input gradation value. By applying it, we have also developed a new halftone technology that improves density robustness, and confirmed the effect with an actual printer.