96 results about "Forgery detection" patented technology

A print management system includes a policy that determines a protection level for a document to be printed. The document is printed using forgery detection and deterrence technologies, such as fragile and robust watermarks, glyphs, and digital signatures, that are appropriate to the level of protection determined by the policy. A plurality of printers are managed by a print management system. Each printer can provide a range of protection technologies. The policy determines the protection technologies for the document to be printed. The print management system routes the print job to a printer that can apply the appropriate protections and sets the appropriate parameters in the printer. Copy evidence that can establish that a document is a forgery and/or tracing information that identifies the custodian of the document and restrictions on copying of the document and use of the information in the document are included in the watermark that is printed on the document. A document can be verified as an original or established as a forgery by inspecting the copy evidence and/or tracing information in the watermark.

A print management system includes a policy that determines a protection level for a document to be printed. The document is printed using forgery detection and deterrence technologies, such as fragile and robust watermarks, glyphs, and digital signatures, that are appropriate to the level of protection determined by the policy. A plurality of printers are managed by a print management system. Each printer can provide a range of protection technologies. The policy determines the protection technologies for the document to be printed and the print management system routes the print job to a printer that can apply the appropriate protections and sets the appropriate parameters in the printer. Copy evidence that can verify that a document is a forgery and/or tracing information that identifies the custodian(s) of the document and restrictions on copying of the document and use of the information in the document are included in the watermark that is printed with the document information. A document can be verified as an original or a forgery by inspecting the copy evidence and/or tracing information in the watermark.

The invention relates to a living iris detection method, which comprises the following steps of: S1, pre-treating a living iris image and an artificial iris image in a training image library; performing multi-scale characteristic extraction of local binary mode in an obtained interested area, and selecting the preferable one from the obtained candidate characteristics by using an adaptive reinforcement learning algorithm, and establishing a classifier for living iris detection; and S2, pre-treating the randomly input test iris image, and calculating the preferable local binary-mode characteristic in the obtained interested area; inputting the calculated characteristic value into the classifier for living iris detection obtained in step S1, and judging whether the test image is from the living iris according to the output result of the classifier. The invention can perform effective anti-forgery detection and alarm for the iris image and reduce error rate in iris recognition. The invention is widely applicable to various application systems for identification and safety precaution by using iris recognition.

A counterfeit detection device that is useful for optically examining the security features of currency to determine its authenticity. The apparatus places the currency at the object plane of a magnifying lens suitable for enlarging the image of the microprinting as well as examining other fine features of the bill. In one embodiment, the device consists of a rear illuminating light source a bill positioning slot a magnifying lens, and an environmental light shade. Further embodiments include a capability of front illumination to detect the color shifting ink, an ultraviolet light source causal to viewing the phosphorescent glow of the polyester thread with its identifying color. And finally, a version with a swing-away lens to view the watermark unmagnified.

A tamper detection device detects tampering with a program loaded to memory, at high speed and without compromising the safety. Prior to loading of a program, a dividing-size determining unit 12 determines a block size based on random number information, a dividing unit 13 divides the program by the block size into data blocks, and a first conversion unit 14 converts, by conducting a logical operation, the data blocks into intermediate authentication data no greater than the block size, and a second conversion unit 15 conducts a second conversion on the intermediate authentication data to generate authentication data. The authentication data and the block size are stored. After the program loading, a program resulting from the loading is divided by the block size, followed by the first and second conversions to generate comparative data. The comparative data is compared with the authentication data to detect tampering of the loaded program.

The invention discloses a false face video identification method and system based on a convolutional neural network and an attention mechanism, and a readable storage medium. The method comprises thesteps: carrying out the sampling of an inputted video sequence, and obtaining N video frames; detecting, cutting and aligning the video frame to a human face to obtain a high-quality human face image,and obtaining a to-be-detected sample set; inputting the to-be-tested sample set into a trained deep convolutional neural network model of an attention mechanism to obtain an output result which is aresult of judging the authenticity of the video. According to the method disclosed in the invention, the negative sample is obtained through the special processing method of the positive sample, thetime cost of obtaining the negative sample is reduced, the face image of the fake face video is simulated well, and the trained network has good identification capability; in addition, the method canhighlight the manipulated image regions, thereby guiding the neural network to detect the regions, facilitating the detection of face counterfeiting, and improving the accuracy of an original CNN model.

The invention discloses a refined feature fusion method for face counterfeit video detection and relates to the field of mode recognition. The method comprises steps of carrying out the frame decomposition of a true and false face video, and converting a video format file into a continuous image frame sequence; performing face position detection on the continuous image frame sequence, and adjusting a detection result to enable a face frame to contain a background; cutting a face frame for each frame of image to obtain a face image training set, and training an EfficentNet B0 model; randomly selecting N continuous frames from the face image sequence, and inputting the N continuous frames into an EfficentNet B0 model to obtain a feature map group; and decomposing the feature map group into independent feature maps, re-stacking the feature maps of the same channel according to an original sequence order to obtain a new feature map group, performing secondary feature extraction to obtain afeature vector, connecting the feature vector to a single neuron, and performing final video clip true and false classification by taking sigmoid as an activation function. According to the method, the spatial domain information is reserved, the time domain information is fully extracted, and counterfeiting detection precision is effectively improved.

The invention belongs to the technical field of neural network security, and particularly relates to a deep fake face data identification method. According to the method, fine counterfeit features are captured on different scales and are used for deep counterfeit detection. Specifically, a multi-modal multi-scale converter (M2TR) is introduced, and image blocks of different sizes are operated by using a multi-scale converter so as to detect local context inconsistency of different scales. In order to improve the detection result and improve the robustness of image compression, frequency information is introduced into the M2TR, and the frequency information is further combined with RGB features through a cross-modal fusion module. The effectiveness of the method is verified through a large number of experiments, and the performance of the method exceeds that of the most advanced deep counterfeiting detection method at present.

The invention discloses a forgery detection method for spliced and distorted digital photos, comprising the steps of selecting random pixels; using the resampling and neural network algorithm to perform loop iteration so as to estimate CFA (color filter array) interpolation in the digital photos; continuously removing suspicious distorted points by an error mean deviation degree model in the resampling and iteration computation, finally, obtaining an undistorted pixel set in the whole primary color plane; and performing CFA interpolation algorithm function estimation by the pixels in the set as standard, judging suspicious distorted points according to the error mean deviation degree model so as to judge if the digital photos are fake. The forgery detection method for the spliced and distorted digital photos is good in generality, less in erroneous judgment and more accurate in forgery detection effect.

Imaging optical systems having good transmission and that are well corrected over the full 315 nm-1100 nm ultraviolet-visible-infrared (UV-VIS-IR) wavelength band are disclosed. A wide variety of apochromatic and superachromatic design examples are presented. The imaging optical systems have a broad range of applications in fields where large-bandwidth imaging is called for, including but not limited to forensics, crime scene documentation, art conservation, forgery detection, medicine, scientific research, remote sensing, and fine art photography.

The invention relates to a deep forged video detection method and system based on time sequence inconsistency, and belongs to the field of video detection. The method comprises the following steps: S1, acquiring a video data set, and preprocessing the data to obtain a face image of a video frame; S2, inputting the video frame into an attention mechanism module network of a fine-tuning network Xception + convolution module for training, wherein the attention mechanism module network is used for extracting video frame-level features; S3, performing feature extraction of continuous frames of thevideo by using the trained Xception network, and inputting the features into a bidirectional long-short-term memory network + conditional random field network model for training; S4, performing forgery detection on a to-be-tested video by using the trained model. According to the method, the time sequence inconsistency of the video between the frames is caused by using a counterfeiting technology,and the detection of the deeply counterfeited video is improved to a certain extent by combining a bidirectional long-short-term memory network and a conditional random field algorithm.

The invention relates to a deep forgery detection method and device, a storage medium and electronic equipment, and aims to improve the generalization performance of a deep forgery detection model so as to improve the scene applicability of deep forgery detection. The method comprises the following steps: acquiring a to-be-detected target image; inputting the target image into a deep forgery detection model to determine whether the target image is a real face image, wherein a training sample of the deep forgery detection model comprises a real face sample image and a counterfeit face sample image; and a training step of the deep forgery detection model comprising the following steps: generating a first adversarial sample image corresponding to the real face sample image and a second adversarial sample image corresponding to the counterfeit face sample image through a generator, and adjusting parameters of the deep forgery detection model according to the first adversarial sample image and the second adversarial sample image.

The invention discloses a face forgery detection method based on a multi-region attention mechanism. The method comprises the steps: inputting a to-be-detected face image into a convolutional neural network, and obtaining a shallow-layer feature map, a middle-layer feature map and a deep-layer feature map; performing texture enhancement operation on the shallow feature map to obtain a texture feature map; generating a multi-region attention map for the intermediate layer feature map through a multi-attention mechanism; performing attention pooling on the texture feature map by using a multi-region attention map to obtain local texture features, adding the attention maps, and performing attention pooling on the deep feature map to obtain global features; and the global features and the local texture features are fused and then classified to obtain a face forgery detection result. The method has a plurality of attention regions, and each region can extract mutually independent features to enable the network to pay more attention to local texture information, so that the accuracy of a detection result is improved.

Data to be encrypted (301) is partially extracted successively. A result of encrypting a previously extracted portion of the data is used to successively calculate that of encrypting the currently extracted portion of the data successively. Successively calculated results of the encryption are used to generate encrypted data (305). In generating the encrypted data, a finally calculated result of the encryption (PF(z+1)) is attached to the generated encrypted data. The finally calculated result is used as falsification detecting data (308) for detecting whether the data to be encrypted is falsified data.

The invention relates to an authentication method and an apparatus. An authentication method for use in an apparatus having a function, a function to execute a first program that executes a predetermined process after first user authentication with biometrics authentication is performed and does not have a network connection function, and a function to execute a second program that is invoked after the first program is executed, executed after second user authentication and has a network connection function comprises executing the first program in forgery detection mode regardless of a resultof a user determination if biometrics authentication with forgery is detected at the time of the first user authentication, invoking the second program in the forgery detection mode after the first program is executed in the forgery detection mode, and notifying a device connected to an external network of forgery detection information by using the network connection function after the second program is invoked in the forgery detection mode.

The invention discloses a face forgery clue migration method based on knowledge distillation. The method comprises the following steps: selecting a pre-training data set; selecting the first classification network model as a teacher model, and pre-training the teacher model by using the pre-training data set to obtain a pre-trained teacher model; selecting the second classification network model as a student model, and constructing a teacher-student joint network model by using the student model and the trained teacher model; selecting a training data set, inputting the training data set into the teacher-student joint network model, and training the student model by using the training data set to obtain a trained student model; and inputting the to-be-recognized face image into the trained student model to obtain a probability value that the to-be-recognized face image is a real image or a forged image, and further judging the authenticity of the face image. According to the invention, under the condition of avoiding loss of priori counterfeit clue knowledge, the accuracy and generalization of face counterfeit detection are improved.

The invention belongs to the technical field of digital image authenticity identification and image processing, and relates to a picture counterfeiting detection method based on shadow matte consistency. The method comprises the following steps: finding out two or more shadow areas to be judged in an image to be detected, for each shadow area, extracting all boundary points of shadows; for each boundary point as a center, extending outwards to form an M*M rectangular area, classifying the points in a frame into two, namely points in the shadows and point out of the shadows, and calculating shadow matte values of the shadow boundary points; counting the distribution condition of the shadow matte value of each shadow area; and calculating the distribution similarity of the shadow matte values of different areas, and positioning counterfeiting areas. The method does not need to preprocess the images, has the advantage of low calculating complexity and has higher feasibility and applicability.

The invention provides a face depth forgery detection method and system based on face division. The method comprises the following steps: extracting global face features from training data; according to shallow convolution features generated in the process of obtaining the global face features, dividing the shallow convolution features into a plurality of image areas according to a preset face division mode, and inputting the image areas into a local face feature extraction model to obtain a plurality of local features of a face image; and extracting relation features among the plurality of local features through an attention model, splicing the relation features and the global features, inputting the spliced relation features and global features into a dichotomy model to obtain a detection result of the training data, and constructing a loss function according to the result and a label to train a global face feature extraction model, the local face feature extraction model, the attention model and the dichotomy model.

A document forgery detection method comprising using at least one processor for providing at least one histogram of gray level values occurring in at least a portion of at least one channel of an image assumed to represent a document including text, the histogram having been generated by image processing at least a portion of at least one channel of an image assumed to represent a document including text, the image having been sent by a remote end user to an online service over a computer network, evaluating monotony of at least a portion of the at least one histogram; and determining whether the image is authentic or forged based on at least one output of the evaluating.

The invention describes a method (100) for counterfeit detection using a portable device (1) with installed counterfeit detection application, to a data carrier (30) comprising this counterfeit detection application, to the portable device (1) used in this method and to a cover (50) comprising guiding structures to perform this method comprising the steps of taking multiple overlapping pictures (110) from at least a portion of the object (10) with the camera (2) of the portable device (1) positioned in front of the object (10) during relatively moving (RM) the portable device with respect to and (1) along the object (10); combining (120) all taken pictures to a single combined image of at least the portion of the object (10) with increased resolution by the counterfeit detection application (4) executed on the portable device (1); applying image processing (130) to the combined image by the counterfeit detection application (4) providing an improved image with improved properties compared to the combined image to order to visualize or enhance the hidden features of the object (10) comprising an increased contrast in the infrared and/or ultraviolet wavelength range being transmitted by the adapted band pass filter (3); and comparing (140) the improved image with the visualized or enhanced hidden features of the object (10) with a reference image of the object (10) comprising the hidden features by the counterfeit detection application (4) to provide (200) an authentication result for the performed counterfeit detection.