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AssigneeCanon Kabushiki Kaisha
InventorsJunichi Nakagawa, Mitsuhiro Ono, Hidetsugu Kagawa, Nobutaka Miyake, Akitoshi Yamada, Fumitaka Goto, Ryosuke Iguchi, Tomokazu Ishikawa, Senichi Saito
Estimating the term…
In order to print a unit area of a print medium by a first printing scan and a second printing scan, dither patterns are formed which can control the arrangement of dots on the print medium without adverse effects of density unevenness and graininess, that are caused by printing position displacement. Regarding first and second dither patterns, information indicating whether or not a threshold is already set to a reference pixel and one or more pixels around the reference pixel in the first dither pattern is obtained for cases where each pixel in the first dither pattern is the reference pixel. A pixel in the second dither pattern to which a predetermined pixel is to be set is determined based on the obtained information. The first and second dither patterns formed in the above manner are associated with the first printing scan and the second printing scan, respectively.
A dither pattern forming method for forming a dither pattern constituted by thresholds which are prepared for N pixels (N is a natural number) constituting a unit area and which are compared with the multi-valued gradation values of the N pixels to reduce gradation of the multi-valued gradation values, comprising:
An image processing apparatus for printing an image on a unit area by performing a first printing scan and a second printing scan of a printing head for the unit area of a printing medium, comprising:
An image processing apparatus for printing an image on a unit area of a printing medium by using a first printing head and a second printing head, comprising:
A dither pattern forming method for forming a dither pattern constituted by thresholds which are prepared for N pixels (N is a natural number) constituting a unit area and which are compared with the multi-valued gradation values of the N pixels to reduce gradation of the multi-valued gradation values, comprising:
A non-transitory storage medium for storing a program for causing a computer to execute a dither pattern forming method for forming a dither pattern constituted by thresholds which are prepared for N pixels (N is a natural number) constituting a unit area and which are compared with the multi-valued gradation values of the N pixels to reduce gradation of the multi-valued gradation values, comprising:
Dependencies are inferred from the claim text.