CN114360034A - Method, system and equipment for detecting deeply forged human face based on triplet network - Google Patents
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Abstract
The invention discloses a method, a system and equipment for detecting a deep forged face based on a triplet network
Preprocessing into 299 x 3 size, inputting into the main feature extraction network of the three-cell network to obtain the depth feature of the face imageNet(I)，Net(I)Is a characteristic vector of 2048 dimensions; then using the classification network pairNet(I)And (3) classifying, outputting a 2-dimensional feature by a classification network for the input 2048-dimensional feature vector, converting the numerical value of the 2-dimensional feature into a probability through Softmax processing, and expressing the relative probability of authenticity of the picture, wherein the picture with the probability greater than a preset value is a forged face picture. The three-cell network can extract more effective true and false face identification characteristics and has more accurate deep fake face detection effect.
Description
Technical Field
The invention belongs to the technical field of artificial intelligence safety, relates to a method, a system and equipment for detecting a deep forged face, and particularly relates to a method, a system and equipment for detecting a deep forged face based on a three-cell network.
Background
Deep forgery is a technology for creating or synthesizing forged content (such as images and videos) based on intelligent methods such as deep learning. In recent years, with the development of deep learning techniques, deep forgery has progressed at an unprecedented rate. At present, the depth counterfeiting technology can generate face changing images and imitate action expressions of real person speaking, can create people which do not exist in reality, is difficult to distinguish, and subverts the traditional concept of 'seeing the eyes as the reality'.
The deep counterfeiting technology brings great harm to individuals, society and countries once being abused.
The best way to combat "depth forgery" is "depth forgery detection". The depth forgery detection technology aims to detect whether an image or video is forged or not through the depth forgery technology. The current mainstream detection methods include a detection method using the conventional image features and a detection method based on deep learning. With the development of deep learning techniques, more and more novel deep forgery detection techniques are applied. Researchers extract depth features in the image by constructing different convolutional neural network structures, and judge whether the face is deeply forged or not by using the depth features. In order to improve the expressive power of features, researchers continuously propose new network architectures, including Xception network, residual network and DenseNet in mainstream. Frequency domain information is introduced into the convolutional neural network by researchers, and the expression capacity of the features is improved.
However, although these convolutional neural network structures can well extract the main features of the image, these networks with single sample input easily focus on feature expressions that are not related to the picture authenticity attribute, such as background features, skin color features, and the like, and it is difficult to capture the intrinsic feature expressions related to the picture authenticity attribute, especially when multiple pictures are similar in appearance but different in authenticity attributes, these networks easily extract similar image features, thereby affecting the accuracy of detection.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method, a system and an electronic device for detecting deep face forgery based on a three-cell network. The 3 coupled samples of the original picture, the target picture and the forged picture are used for learning the input network, so that the network can capture characteristic expressions which are similar in appearance but different in true and false attributes.
The method adopts the technical scheme that: a deep fake face detection method based on a triplet network comprises the following steps:
step 1: counterfeit human face image to be detectedIPreprocessing the image into a preset size and inputting the preset size into a trunk feature extraction network of a three-cell network to obtain the depth feature of the face imageNet(I)；Net(I)Is a characteristic vector of 2048 dimensions;
step 2: using a classification network pairNet(I)Classifying, namely outputting a 2-dimensional feature by a classification network for the input 2048-dimensional feature vector, and converting the numerical value of the 2-dimensional feature into relative probability through Softmax processing to express the relative probability of authenticity of the picture; wherein, the picture with the probability larger than the preset value is a forged face picture;
the main feature extraction network of the three-cell network adopts a framework of an Xconvergence network, and comprises an inlet flow, a middle flow and an outlet flow; the ingress stream contains 2 convolutions of 3 × 3 and is activated using the ReLU activation function and 3 volume blocks; the intermediate stream contains 8 convolution modules; the exit stream comprises a volume block and two times of 3 x 3 depth separable convolutions, and is activated by using a ReLU function, and finally an average pooling operation is performed; three trunk characteristic extraction networks share one weight;
the classification network adopts a BP neural network and comprises three layers, wherein the first layer is an input layer and comprises 2048 nodes; the middle layer comprises 1024 nodes, and the output layer comprises 2 nodes; and a ReLU activation function is used between each layer for activation.
The technical scheme adopted by the system of the invention is as follows: a depth fake face detection system based on a three-cell network comprises the following modules:
module 1 for detecting a fake face image to be detectedIPreprocessing the image into a preset size and inputting the preset size into a trunk feature extraction network of a three-cell network to obtain the depth feature of the face imageNet(I)；Net(I)Is a characteristic vector of 2048 dimensions;
module 2 for utilizing a classification network pairNet(I)Classifying, namely outputting a 2-dimensional feature by a classification network for the input 2048-dimensional feature vector, and converting the numerical value of the 2-dimensional feature into relative probability through Softmax processing to express the relative probability of authenticity of the picture; wherein, the picture with the probability larger than the preset value is a forged face picture;
the main feature extraction network of the three-cell network adopts a framework of an Xconvergence network, and comprises an inlet flow, a middle flow and an outlet flow; the ingress stream contains 2 convolutions of 3 × 3 and is activated using the ReLU activation function and 3 volume blocks; the intermediate stream contains 8 convolution modules; the exit stream comprises a volume block and two times of 3 x 3 depth separable convolutions, and is activated by using a ReLU function, and finally an average pooling operation is performed; three trunk characteristic extraction networks share one weight;
the classification network adopts a BP neural network and comprises three layers, wherein the first layer is an input layer and comprises 2048 nodes; the middle layer comprises 1024 nodes, and the output layer comprises 2 nodes; and a ReLU activation function is used between each layer for activation.
The technical scheme adopted by the equipment of the invention is as follows: a depth fake face detection device based on a three-cell network comprises:
one or more processors;
a storage device for storing one or more programs which, when executed by the one or more processors, cause the one or more processors to implement the method for detecting a counterfeit face based on a three-component network.
The invention has the advantages and positive effects that:
(1) the invention adopts 3 coupled samples of the original picture, the target picture and the forged picture to learn the input network. The use of triplets can cause the network to capture a similar appearance, but different in true and false attributes, of the representation of the feature as compared to a single sample input network.
(2) The invention realizes the identification of the deeply forged face and solves the safety problem caused by the forged face in the practical application scene.
Drawings
FIG. 1 is a method schematic of an embodiment of the invention;
FIG. 2 is a schematic diagram of a three-cell network constructed according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a classification network constructed in accordance with an embodiment of the present invention;
fig. 4 is a graph of experimental results for a network constructed according to an embodiment of the present invention.
Detailed Description
In order to facilitate the understanding and implementation of the present invention for those of ordinary skill in the art, the present invention is further described in detail with reference to the accompanying drawings and examples, it is to be understood that the embodiments described herein are merely illustrative and explanatory of the present invention and are not restrictive thereof.
The existing convolutional neural network structure can only extract the depth features of the image, but the depth features do not pay attention to feature expression related to the authenticity attribute of the image. And 3 coupled samples of the original picture, the target picture and the forged picture are sent to the three-cell network for learning, so that the three-cell network can capture characteristic expressions which are similar in appearance but different in true and false attributes.
Referring to fig. 1, the method for detecting a deep forged face based on a three-cell network provided by the invention comprises the following steps:
step 1: counterfeit human face image to be detectedIPreprocessing into 299 x 3 size, inputting into the main feature extraction network of the three-cell network to obtain the depth feature of the face imageNet(I)；Net(I)Is a characteristic vector of 2048 dimensions;
step 2: using a classification network pairNet(I)Classifying, namely outputting a 2-dimensional feature by a classification network for the input 2048-dimensional feature vector, and converting the numerical value of the 2-dimensional feature into relative probability through Softmax processing to express the relative probability of authenticity of the picture; and the picture with the probability greater than the preset value is a forged face picture.
Referring to fig. 2, the backbone feature extraction network of the present embodiment adopts a framework of an Xception network, which includes an inlet flow, an intermediate flow, and an outlet flow; the ingress stream is a feature map that converts a 299 × 299 × 3 picture into a 19 × 19 × 728 picture, contains 2 times of 3 × 3 convolutions and is activated using the ReLU activation function, and 3 volume blocks; the intermediate stream contains 8 convolution modules; the exit stream is obtained by converting a 19 × 19 × 728 feature map into a 2048-dimensional feature vector, including a volume block and two 3 × 3 depth separable convolutions, and performing activation using a ReLU function, and finally performing an average pooling operation; the three main feature extraction networks share a weight, and finally, a 299 x 3 image is converted into a 2048-dimensional feature vector through the main feature extraction networks.
Referring to fig. 3, the classification network of the present embodiment adopts a BP neural network, which includes three layers, where the first layer is an input layer and includes 2048 nodes; the middle layer comprises 1024 nodes, and the output layer comprises 2 nodes; and a ReLU activation function is used between each layer for activation.
The trunk feature extraction network of the embodiment is a trained trunk feature extraction network; the training process comprises the following substeps:
step 1.1: acquiring a plurality of triplets of original image-target image-forged image, and recording as (original,target,fake)；
In the embodiment, firstly, the fake face video, the original face video and the target face video are downsampled, frame images starting from a specific frame and having fixed frame intervals in the video are selected, and the fake face video, the original face video from the fake face video and the video frames obtained by downsampling the target face video are kept in one-to-one correspondence. In the embodiment, 10 frames of images, namely, one frame per second and each video, from 0 second are selected as an original data set;
in this embodiment, a retinaFace face detection algorithm is then used to detect a face region in the acquired frame image, and the face image is cut. Extracting 5 facial feature points including left eye, right eye, nose, left mouth corner and right mouth corner; aligning the face through the facial feature points, so that the aligned face is positioned in the center of the image; the picture is adjusted into 299 pixels long, 299 pixels wide and 3 channels through opencv, the processed face image is organized into three groups of data of original face-target face-forged face, and the data is recorded as (original,target,fake)。
In the embodiment, the processed face image is organized into the original face-target face-forged face triple data which are obtained in the step 1.1 and are respectively used as input and supervision samples, and the trunk feature extraction network is continuously trained.
Step 1.2: for each set of triplets: (original,target,fake) Sequentially sending the images in the triplets into a trunk feature extraction network of the triplet networkNet( )(ii) a Obtaining the depth features of the images respectively, and recording as (Net(original)，Net(target)，Net(fake) ); wherein the trunk feature extraction networkNet( )Sharing the weight of (1);
step 1.3, calculating the characteristic distance between the depth characteristic of the original image and the depth characteristic of the target imageDis(Net(original),Net(target) And feature distances of target image depth features and forged image depth featuresDis(Net(target),Net(fake) Therein), whereinDis(a,b) Representing two eigenvectorsa,bThe feature distance between them, the feature vector distance calculation formula is as follows:
wherein
Represents the L2 distance;
step 1.4: calculating the network loss function of the triplet according to the characteristic distance calculated in the step 1.3lossIn order to drive the network model to focus on not appearance-liked features (even if appearance is not like, depth features are close) but true-false attribute expressions (even if appearance is like, depth features are far away), it is desirable that two real picture features are distant from each otherDis(Net(original),Net(target) ) feature distances between true and false images are as small as possibleDis(Net(target),Net(fake) ) is as large as possible. The loss function calculation is therefore as follows:
loss=max (Dis(Net(original),Net(target))-Dis(Net(target),Net(fake))+margin,0)；
wherein the content of the first and second substances,marginsetting the interval between two characteristic distances for the hyper-parameter;
in this embodiment, settingmargin=0.2, this means: when the characteristic distance between the original picture and the target picture is smaller than the characteristic distance between the target picture and the forged picture by 0.2, no loss is generated.
Step 1.5: after calculating the loss, performing back propagation and optimization on the trunk feature extraction network by using an Adam optimizer;
step 1.6: and (5) repeating the step 1.1-1.5, and training the trunk feature extraction network until convergence, so as to obtain the trained trunk feature extraction network.
The classification network of the embodiment is a trained classification network; the training process comprises the following substeps:
step 2.1: counterfeit human face image to be detectedIPre-processed to 299 x 3 sizeInputting the depth features of the face image into a trunk feature extraction network in the trained three-cell networkNet(I)； Net(I)Is a characteristic vector of 2048 dimensions;
step 2.2: using a classification network pairNet(I)Classifying, namely outputting a 2-dimensional feature by a classification network for the input 2048-dimensional feature vector, and converting the numerical value of the 2-dimensional feature into relative probability through Softmax processing to express the relative probability of authenticity of the picture;
step 2.3: calculating a cross entropy loss function between the predicted result and the actual resultloss，lossThe calculation method of (2) is as follows:
whereinp i Representative sampleiThe probability of being true is the probability that,y i representative sampleiIf the sample is a label ofiTo forge a picture, theny i =0, otherwise y i =1；
Step 2.4: after the cross entropy loss is calculated, an SGD optimizer is used, and a gradient descent method is used for back propagation and optimizing a classification network;
step 2.5: and (5) repeating the step 2.1 and the step 2.4 until the classification network is converged to obtain the trained classification network.
And after the steps are completed, carrying out an experiment on the network. And mixing the forged image and the real image and sending the mixture into the trained triplet network for feature extraction. The extracted feature vectors are mapped on a two-dimensional plane rectangular coordinate, and the result is shown in fig. 4. As can be seen from fig. 4, the features of the forged face are significantly distinguished from those of the real face. The method can detect the authenticity of the face image, and the detection result has higher reliability.
It should be understood that the above description of the preferred embodiments is given for clarity and not for any purpose of limitation, and that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. A deep fake face detection method based on a triplet network is characterized by comprising the following steps:
step 1: counterfeit human face image to be detectedIPreprocessing the image into a preset size and inputting the preset size into a trunk feature extraction network of a three-cell network to obtain the depth feature of the face imageNet(I)；Net(I)Is a characteristic vector of 2048 dimensions;
step 2: using a classification network pairNet(I)Classifying, namely outputting a 2-dimensional feature by a classification network for the input 2048-dimensional feature vector, and converting the numerical value of the 2-dimensional feature into relative probability through Softmax processing to express the relative probability of authenticity of the picture; wherein, the picture with the probability larger than the preset value is a forged face picture;
the main feature extraction network of the three-cell network adopts a framework of an Xconvergence network, and comprises an inlet flow, a middle flow and an outlet flow; the ingress stream contains 2 convolutions of 3 × 3 and is activated using the ReLU activation function and 3 volume blocks; the intermediate stream contains 8 convolution modules; the exit stream comprises a volume block and two times of 3 x 3 depth separable convolutions, and is activated by using a ReLU function, and finally an average pooling operation is performed; three trunk characteristic extraction networks share one weight;
the classification network adopts a BP neural network and comprises three layers, wherein the first layer is an input layer and comprises 2048 nodes; the middle layer comprises 1024 nodes, and the output layer comprises 2 nodes; and a ReLU activation function is used between each layer for activation.
2. The method for detecting the deep forged face based on the triplet network as claimed in claim 1, wherein: the trunk feature extraction network of the three-cell network in the step 1 is a trained trunk feature extraction network; the training process comprises the following substeps:
step 1.1: acquiring a plurality of triplets of original image-target image-forged image, and recording as (original,target,fake)；
Step 1.2: for each set of triplets: (original，target，fake) Sequentially sending the images in the triplets into a trunk feature extraction network of the triplet networkNet( )(ii) a Obtaining the depth features of the images respectively, and recording as (Net(original)，Net(target)，Net(fake) ); wherein the trunk feature extraction networkNet( )Sharing the weight of (1);
step 1.3: calculating the feature distance between the depth feature of the original image and the depth feature of the target imageDis(Net(original),Net(target) And feature distances of target image depth features and forged image depth featuresDis(Net(target),Net(fake) Therein), whereinDis(a,b) Representing two eigenvectorsa,bThe feature distance between them, the feature vector distance calculation formula is as follows:
wherein
Represents the L2 distance;
step 1.4: calculating the network loss function of the triplet according to the characteristic distance calculated in the step 1.3loss，The loss function calculation formula is as follows:
loss=max (Dis(Net(original),Net(target))-Dis(Net(target),Net(fake))+margin,0)；
wherein the content of the first and second substances,marginsetting the interval between two characteristic distances for the hyper-parameter;
step 1.5: after calculating the loss, performing back propagation and optimization on the trunk feature extraction network by using an Adam optimizer;
and 1.6, repeating the step 1.1-1.5, and training the trunk feature extraction network until convergence to obtain the trained trunk feature extraction network.
3. The method for detecting the deep forged face based on the triplet network as claimed in claim 2, wherein the step 1.1 comprises the following steps:
step 1.1.1: selecting frame images starting from specified frames and having fixed frame number intervals from the forged face video, the target face video and the original face video; enabling the original face video frame, the target face video frame and the forged face video frame to correspond one to one; generating a group of original face-target face-fake face images;
step 1.1.2: preprocessing the images in the step 1.1.1, and identifying and cutting a face area of each image through a face detection technology; aligning the human face through the human face feature point, so that the aligned human face is positioned in the center of the image; organizing the obtained image into a triplet of an original image, a target image and a fake image, and marking as (original,target,fake)。
4. The method for detecting the deep forged face based on the triplet network as claimed in claim 1, wherein: the classification network in the step 2 is a trained classification network; the training process comprises the following substeps:
step 2.1: counterfeit human face image to be detectedIPreprocessing into 299 x 3 size, inputting into the main feature extraction network in the trained three-cell network to obtain the depth feature of the face imageNet(I)； Net(I)Is a characteristic vector of 2048 dimensions;
step 2.2: using a classification network pairNet(I)Classifying, namely outputting a 2-dimensional feature by a classification network for the input 2048-dimensional feature vector, and converting the numerical value of the 2-dimensional feature into relative probability through Softmax processing to express the relative probability of authenticity of the picture;
step 2.3: calculating intersections between predicted results and actual resultsEntropy loss functionloss，lossThe calculation method of (2) is as follows:
whereinp i Representative sampleiThe probability of being true is the probability that,y i representative sampleiIf the sample is a label ofiTo forge a picture, theny i =0, otherwise y i =1；
Step 2.4: after the cross entropy loss is calculated, an SGD optimizer is used, and a gradient descent method is used for back propagation and optimizing a classification network;
step 2.5: and (5) repeating the step 2.1 and the step 2.4 until the classification network is converged to obtain the trained classification network.
5. A depth fake face detection system based on a three-cell network is characterized by comprising the following modules:
module 1 for detecting a fake face image to be detectedIPreprocessing the image into a preset size and inputting the preset size into a trunk feature extraction network of a three-cell network to obtain the depth feature of the face imageNet(I)；Net(I)Is a characteristic vector of 2048 dimensions;
module 2 for utilizing a classification network pairNet(I)Classifying, namely outputting a 2-dimensional feature by a classification network for the input 2048-dimensional feature vector, and converting the numerical value of the 2-dimensional feature into relative probability through Softmax processing to express the relative probability of authenticity of the picture; wherein, the picture with the probability larger than the preset value is a forged face picture;
the main feature extraction network of the three-cell network adopts a framework of an Xconvergence network, and comprises an inlet flow, a middle flow and an outlet flow; the ingress stream contains 2 convolutions of 3 × 3 and is activated using the ReLU activation function and 3 volume blocks; the intermediate stream contains 8 convolution modules; the exit stream comprises a volume block and two times of 3 x 3 depth separable convolutions, and is activated by using a ReLU function, and finally an average pooling operation is performed; three trunk characteristic extraction networks share one weight;
the classification network adopts a BP neural network and comprises three layers, wherein the first layer is an input layer and comprises 2048 nodes; the middle layer comprises 1024 nodes, and the output layer comprises 2 nodes; and a ReLU activation function is used between each layer for activation.
6. A depth forgery face detection device based on three-cell network is characterized by comprising:
one or more processors;
storage means for storing one or more programs which, when executed by the one or more processors, cause the one or more processors to implement the network-based deep false face detection method according to any one of claims 1 to 4.
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