公开(公告)号：US20180225815A1

公开(公告)日：2018-08-09

申请号：US15487584

申请日：2017-04-14

Applicant: Xerox Corporation

Inventor： Stuart Schweid ,  Douglas R. Taylor

IPC: G06T7/00 ,  G06K9/62

CPC classification number: G06T7/001 ,  G06K9/62 ,  G06K9/6202 ,  G06K9/6206 ,  G06K9/6215 ,  G06K9/6267 ,  G06K9/6284 ,  G06T2207/10008 ,  G06T2207/20036 ,  G06T2207/30144 ,  G06T2207/30168

Abstract: A system for detecting defects in a print system may include a print engine to print an electronic document (a reference image) and yield a printed document. The system may also include an image sensor to scan the printed document into a scanned electronic document (a target image). The system may include a processing device to detect defects in the printed document by analyzing the activity level in the reference and target image. The system may identify a quiet area/pixel in the reference image based on the activity level, check the activity level of the corresponding pixel in the target image, and classify the pixel in the target image as defective if the activity level of the pixel in the target image exceeds a noise threshold. The system may additionally swap the reference and target image, repeat the detection steps and combine the detection results with those before the swap.

公开(公告)号：US20140333691A1

公开(公告)日：2014-11-13

申请号：US13890790

申请日：2013-05-09

Applicant: XEROX CORPORATION

Inventor： Douglas R. Taylor ,  Robert E. Rosdahl, JR. ,  Brian R. Conrow

IPC: B41J2/21

CPC classification number: B41J2/2142 ,  B41J2/2139 ,  B41J2/2146

Abstract: A method of printer operation enables visual detection of defective inkjets. The method includes operating inkjets in a predetermined number of printheads that eject a same color of ink to form a test pattern having three portions. One portion is printed by the even-numbered inkjets in each printhead, one portion is printed by the odd-numbered inkjets in each printhead, and a third portion is printed by all of the inkjets in each printhead. The portions are printed immediately adjacent to one another in a process direction with the third portion between the other two portions.

Abstract translation: 打印机操作的方法使得能够可视地检测有缺陷的喷墨喷嘴。 该方法包括在预定数量的打印头中操作喷墨喷嘴以喷射相同颜色的墨水以形成具有三个部分的测试图案。 一部分由每个打印头中的偶数喷墨打印头，一部分由每个打印头中的奇数喷墨打印，并且第三部分由每个打印头中的所有喷墨打印。 这些部分在处理方向上彼此紧邻地打印，其中第三部分在另外的两个部分之间。