公开(公告)号：US20120057210A1

公开(公告)日：2012-03-08

申请号：US13215680

申请日：2011-08-23

Applicant: Hajime TSUKAHARA ,  Makio KONDO

Inventor： Hajime TSUKAHARA ,  Makio KONDO

IPC: H04N1/40

CPC classification number: H04N1/00013 ,  H04N1/00031 ,  H04N1/00045 ,  H04N1/0005 ,  H04N1/00055 ,  H04N1/00087 ,  H04N1/1215 ,  H04N1/125 ,  H04N1/193 ,  H04N1/2032 ,  H04N1/401 ,  H04N2201/0081

Abstract: A correction-data generating unit divides, into a matrix of row blocks in a sub scanning direction and column blocks in a main scanning direction, white data on a transfer drum read by a reading unit during a predetermined time period that is shorter than a time period in which the read point of the transfer drum is returned to a position where the reading unit has started reading the first white reference member, calculates, for each column of the matrix, a correction-data candidate value corresponding to a variation ratio of a mean of data of the row blocks in the sub-scanning direction, and determines a minimum value of the calculated correction-data candidate values as the correction data. A shading-data correcting corrects the shading data by using the generated correction data. A shading correcting unit performs shading correction on image data of a document after the correction data is generated.

Abstract translation: 校正数据生成单元将在副扫描方向上的行块和主扫描方向上的列块的矩阵分割为在比时间短的预定时间段期间由读取单元读取的转印鼓上的白色数据 将转印鼓的读取点返回到读取单元已经开始读取第一白色参考构件的位置的周期，对于矩阵的每列计算对应于a的变化比的校正数据候选值 在副扫描方向上的行块的数据的平均值，并且将所计算的校正数据候选值的最小值确定为校正数据。 阴影数据校正通过使用所生成的校正数据校正着色数据。 阴影校正单元在生成校正数据之后对文档的图像数据执行阴影校正。