| 发明名称 | Detecting alteration of an image based on pattern information of color filter array | ||
| 摘要 | A CFA pattern is extracted from captured image data for each first unit region. A first altered region is detected from disturbance of the periodicity of the CFA pattern, and the first altered region is an image region in which copying has been performed from image data different from the captured image data to the captured image data. The feature amount of the captured image data is extracted for each second unit region different in size from the first unit region. The feature amounts are compared for each second unit region to detect a second altered region, and the second altered region is an image region in which copying has been performed from the captured image data to the captured image data. Information concerning the first and second altered regions are output as alteration detection results in the captured image data. | ||
| 申请公布号 | US8983115(B2) | 申请公布日期 | 2015.03.17 |
| 申请号 | US201313755832 | 申请日期 | 2013.01.31 |
| 申请人 | Canon Kabushiki Kaisha | 发明人 | Kawazu Ayuta |
| 分类号 | G06K9/00;G06K9/46;G06T1/00 | 主分类号 | G06K9/00 |
| 代理机构 | Fitzpatrick, Cella, Harper & Scinto | 代理人 | Fitzpatrick, Cella, Harper & Scinto |
| 主权项 | 1. An image processing apparatus comprising: a first detector configured to extract a pattern of a color filter array from captured image data for each first unit region, and to detect a first altered region from disturbance of periodicity of the pattern, wherein the first altered region is an image region in which copying has been performed from image data different from the captured image data to the captured image data; a second detector configured to extract a feature amount of the captured image data for each second unit region different in size from the first unit region, and to compare a feature amount for the each second unit region to detect a second altered region, wherein the second altered region is an image region in which copying has been performed from the captured image data to the captured image data; and an output section configured to output information concerning the first altered region and information concerning the second altered region as alteration detection results in the captured image data, wherein the second detector detects the second altered region based on the captured image data from which the first altered region is excluded, and wherein at least one of the first and second detectors is implemented using a processor. | ||
| 地址 | Tokyo JP | ||