公开(公告)号：KR101518132B1

公开(公告)日：2015-05-07

申请号：KR1020130134657

申请日：2013-11-07

Applicant: 한국과학기술원

Inventor： 이흥규 ,  정대진 ,  현대경 ,  류승진

IPC: G06T7/00

CPC classification number: H04N5/357 ,  G06T7/0002 ,  G06T2207/10016

Abstract: 샷기반의센서패턴노이즈를이용한불법포르노그래피탐지방법및 그장치가개시된다. 영상판별방법은, 입력영상을적어도하나의프레임으로이루어진프레임집합으로분류하는단계; 상기프레임집합각각에대하여상기프레임집합으로부터센서패턴노이즈(sensor pattern noise)를추정하는단계; 상기센서패턴노이즈로부터상관도를계산하는단계; 및상기상관도에따라상기입력영상에대한불법영상여부를판별하는단계를포함할수 있다.

Abstract translation: 公开了一种通过使用基于射击的传感器图案噪声来检测非法色情内容的方法及其装置。 在本发明中，用于识别图像的方法包括以下步骤：将输入图像分类成由至少一个帧组成的帧组; 从每个帧组的帧集合估计传感器模式噪声; 从传感器模式噪声计算相关性; 以及基于所述相关性来确定所述输入图像是否是非法的。

公开(公告)号：KR101363577B1

公开(公告)日：2014-02-17

申请号：KR1020120092266

申请日：2012-08-23

Applicant: 한국과학기술원

Inventor： 이흥규 ,  류승진 ,  오태우 ,  정대진

IPC: H04N21/8358

CPC classification number: H04N21/8358 ,  G06T2201/0065 ,  G06T2207/20064

Abstract: The present invention relates to a digital watermark detection function improving apparatus about a resampling attack and a method thereof, which includes: a watermark detector (110) which inspects whether a specific watermark is inserted into an input image or not; a conversion type determining unit (120) which extracts a specific point vector between the input image and an original image in order to draw the change type of the input image which failed in a watermark detection; a size/inverse conversion unit (130) which estimates a size conversion rate from the input image and converts the input image in order to be same as the original image by performing an inverse conversion about a transformed input image; and a rotation/inverse conversion unit (140) which estimates a rotation change rate from the input image and converts the input image in order to be same as the original image by performing an inverse conversion about the transformed input image. The present invention prevents the synchronization problem (an attack like a rotation and an amplification) of a digital watermark in advance by determining whether the size and rotation of an image is converted or not based on a specific point vector which is extracted from an image, estimating a size transformation and a rotation transformation which are added to the image afterward, and determining a watermark by inversely converting an image in which the watermark is inserted as much as the estimated transformation. [Reference numerals] (110) Watermark detector; (120) Change type discrimination unit; (140) Rotation/inverse conversion unit; (AA) Input image; (BB) Failure; (CC) Success; (DD) Watermark extraction; (EE) Rotation; (FF) Magnification

Abstract translation: 本发明涉及一种关于重采样攻击的数字水印检测功能改进装置及其方法，包括：水印检测器（110），其检查特定水印是否被插入到输入图像中; 转换类型确定单元，其提取输入图像和原始图像之间的特定点向量，以便画出在水印检测中失败的输入图像的改变类型; 尺寸/逆转换单元（130），其从输入图像估计尺寸转换率，并且通过执行关于变换的输入图像的逆变换来将输入图像转换为与原始图像相同; 以及旋转/逆转换单元，其从输入图像估计旋转变化率，并且通过执行关于变换的输入图像的逆变换来将输入图像转换为与原始图像相同。 本发明通过基于从图像提取的特定点向量确定图像的大小和旋转是否被转换来预先防止数字水印的同步问题（如旋转和放大的攻击） 估计随后添加到图像中的尺寸变换和旋转变换，并且通过将水印插入的图像与估计的变换反相变换来确定水印。 （附图标记）（110）水印检测器; （120）变更式辨别单元; （140）旋转/逆转换单元; （AA）输入图像; （BB）失败; （CC）成功; （DD）水印提取; （EE）旋转; （FF）放大率