# US 9,434,194 B2 · Ink jet recording apparatus and ink jet recording system using pixel division patterns > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,434,194 B2 - Document ID: US9434194B2 - Status: Granted - Kind: B2 - Application number: 12/619,935 - Filed: 2009-11-17 - Published: 2010-05-20 - Granted: 2016-09-06 - Earliest claimed: 2008-11-20 - Assignees: Canon Kabushiki Kaisha - Applicants: Hinako Iritani; Yuji Konno - Inventors: Hinako Iritani; Yuji Konno - Web page: https://patentgrep.com/patent/US9434194B2 ## CPC - B41J 29/38: Drives, motors, controls or automatic cut-off devices for the entire printing mechanism - B41J 2/17566: {Ink level or ink residue control} - B41J 2/2132: {Print quality control characterised by dot disposition, e.g. for reducing white stripes or banding (methods for local corrections by dot omission, image edge enhancement, or multi-pass mask selection G06K15/102; colour conversion H04N1/40)} - B41J 29/02: Framework - G06K 15/107: {Mask selection} - B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS - G06K: GRAPHICAL DATA READING (image or video recognition or understanding G06V); PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS ## Abstract An ink jet recording apparatus that executes ink jet recording based on multi-pass recording and that achieves a high glossiness and a low granularity is provided. Based on information corresponding to an ink discharge amount, distribution and concentration masks are selected for low and high duty areas of a recorded image, respectively. ## Claims ### Claim 1 An ink jet recording apparatus for recording an image on a unit area of a recording medium by applying ink from a recording head during a plurality of relative scans of the recording head and the unit area based on a plurality of pieces of recording data, the ink jet recording apparatus comprising: a memory configured to store a plurality of division patterns, each having recording permitted pixels which are permitted to be recorded with ink and recording non-permitted pixels which are not permitted to be recorded with ink, the plurality of division patterns at least including (i) a first division pattern, and (ii) a second division pattern having a smaller number of recording permitted pixels adjacent to another recording permitted pixel than the first division pattern, wherein a total number of recording permitted pixels in the second division pattern and a total number of recording permitted pixels in the first division pattern are same as each other; an acquisition unit configured to acquire information indicating an amount of ink to be applied to the unit area during the plurality of the relative scans; a selection unit configured to select one of the plurality of division patterns stored in the memory based on the information acquired by the acquisition unit, wherein the selection unit (i) selects the first division pattern in a case where the information indicates a first amount, and (ii) selects the second division pattern in a case where the information indicates a second amount which is less than the first amount; and a generation unit configured to generate the plurality of pieces of recording data by dividing image data using the division pattern selected by the selection unit. ### Claim 2 (depends on 1) The ink jet recording apparatus according to claim 1, wherein the first division pattern comprises a plurality of first mask patterns corresponding to the plurality of relative scans, and in each of the plurality of first mask patterns, the recording permitted pixels corresponding to each of the plurality of relative scans have a complementary relationship to each other, and wherein the second division pattern comprises a plurality of second mask patterns corresponding to the plurality of relative scans, and in each of the plurality of second mask patterns, the recording permitted pixels corresponding to each of the plurality of relative scans have a complementary relationship to each other. ### Claim 3 (depends on 1) The ink jet recording apparatus according to claim 1, wherein a number of the permitting recording pixels adjacent to another permitting recording pixel is 0 in the second division pattern. ### Claim 4 (depends on 1) The ink jet recording apparatus according to claim 1, wherein the selection unit selects the first division pattern from the plurality of division patterns stored in the memory in a case where the information indicates a third amount which is less than the second amount. ### Claim 5 (depends on 1) The ink jet recording apparatus according to claim 1, wherein the selection unit selects the second division pattern from the plurality of division patterns stored in the memory in a case where the information indicates a third amount which is less than the second amount. ### Claim 6 (depends on 1) The ink jet recording apparatus according to claim 1, wherein the memory further stores a third division pattern in which an arrangement of recording permitted pixels is different an arrangement of recording permitted pixels of the first and second division patterns, and wherein the selection unit selects the third division pattern from the plurality of division patterns stored in the memory in a case where the information indicates a third amount which is less than the second amount. ### Claim 7 (depends on 1) The ink jet recording apparatus according to claim 1, wherein the ink applied from the recording head contains pigment as a color material. ### Claim 8 (depends on 1) The ink jet recording apparatus according to claim 1, wherein the selection unit selects the first division pattern from the plurality of division patterns stored in the memory in a case where the amount indicated by the information is more than the first amount. ### Claim 9 (depends on 1) The ink jet recording apparatus according to claim 1, wherein the selection unit selects the second division pattern from the plurality of division patterns stored in the memory in a case where the amount indicated by the information is less than the second amount. ### Claim 10 (depends on 1) The ink jet recording apparatus according to claim 1, wherein the selection unit selects (i) the first division pattern in a case where the amount indicated by the information is equal to or more than a threshold value, and selects (ii) the second division pattern in a case where the amount indicated by the information is less than the threshold value. ### Claim 11 (depends on 1) The ink jet recording apparatus according to claim 1, wherein the second division pattern is used for suppressing a granularity of the image to be recorded on the unit area. ### Claim 12 (depends on 1) The ink jet recording apparatus according to claim 1, wherein the first division pattern is used for preventing a glossiness of the image to be recorded on the unit area from being decreased. ### Claim 13 (depends on 1) The ink jet recording apparatus according to claim 1, wherein the acquisition unit acquires the information based on a gradation value of multi-valued data. ### Claim 14 (depends on 13) The ink jet recording apparatus according to claim 13, wherein the selection unit selects (i) the first division pattern in a case where the gradation value is equal to or more than a threshold value, and selects (ii) the second division pattern in a case where the gradation value is less than the threshold value. ### Claim 15 An ink jet recording method for recording an image on a unit area of a recording medium by applying ink from a recording head during a plurality of relative scans of the recording head and the unit area based on a plurality of pieces of recording data, the ink jet recording method comprising: a storing step for storing a plurality of division patterns in a memory, each having recording permitted pixels which are permitted to be recorded with ink and recording non-permitted pixels which are not permitted to be recorded with ink, the plurality of division patterns at least including (i) a first division pattern, and (ii) a second division pattern having a smaller number of recording permitted pixels adjacent to another recording permitted pixel than the first division pattern, wherein a total number of recording permitted pixels in the second division pattern and a total number of recording permitted pixels in the first division pattern are same as each other; an acquisition step for acquiring information indicating an amount of ink to be applied to the unit area during the plurality of the relative scans; a selection step for selecting one of the plurality of division patterns stored in the storing step based on the information acquired in the acquisition step, wherein the selection step (i) selects the first division pattern in a case where the information indicates a first amount, and (ii) selects the second division pattern in a case where the information indicates a second amount which is less than the first amount; and a generation step for generating the plurality of pieces of recording data by dividing image data using the division pattern selected in the selection step.