发明名称 |
Determining whether an image is color |
摘要 |
Erroneous determination of an image caused by color shift is prevented. Image data is divided in a sub-scanning direction into a first region where color shift hardly occurs and a second region where color shift easily occurs. There are detected a first color line drawing extending in a main-scanning direction in the first region, a second color line drawing extending in the main-scanning direction and having a width larger than that of the first color line drawing in the second region, and a third color line drawing extending in the sub-scanning direction in the image data. On the basis of the detected first, second, and third color line drawings, it is determined whether a document is a color document or not. |
申请公布号 |
US9007666(B2) |
申请公布日期 |
2015.04.14 |
申请号 |
US201313735972 |
申请日期 |
2013.01.07 |
申请人 |
Canon Kabushiki Kaisha |
发明人 |
Sato Hideo |
分类号 |
H04N1/04 |
主分类号 |
H04N1/04 |
代理机构 |
Fitzpatrick, Cella, Harper & Scinto |
代理人 |
Fitzpatrick, Cella, Harper & Scinto |
主权项 |
1. An apparatus for determining whether an image including a first area, a second area, and a third area surrounding the first area and the second area is color, the apparatus comprising:
(a) a first unit configured to determine whether each line in the first area and each line in the second area have color pixels that are continuous for a first length in a main-scanning direction without determining whether each line in the third area has color pixels that are continuous for the first length in the main-scanning direction; (b) a second unit configured to determine whether, in the first area, lines that have been determined to have color pixels that are continuous for the first length in the main-scanning direction are adjacent in a sub-scanning direction for a second length; (c) a third unit configured to determine whether, in the second area, lines that have been determined to have color pixels that are continuous for the first length in the main-scanning direction are adjacent in the sub-scanning direction for a third length longer than the second length; (d) a fourth unit configured to determine that the image is color in a case that the lines in the first area are determined to be adjacent in the sub-scanning direction for the second length, or the lines in the second area are determined to be adjacent in the sub-scanning direction for the third length, and to determine that the image is not color in a case that the lines in the first area are determined not to be adjacent in the sub-scanning direction for the second length, and the lines in the second area are determined not to be adjacent in the sub-scanning direction for the third length. |
地址 |
Tokyo JP |