The most popular concept of artificial intelligence was first proposed by computer experts in 1956. Although it has experienced several cold winters in the following decades, with the rapid development of data resources, computing power and core algorithms, artificial intelligence has evolved from computational intelligence to higher-level perceptual and cognitive intelligence. In order to occupy a place in the market, animation related manufacturers continue to launch new animation works and applications in their own products in order to retain users and attract users. The integration of artificial intelligence technology into products will be a very novel and interesting application . The intelligent analysis of animation characters in this paper is such an application. It analyzes the animation characters contained in the image in the form of target detection, which can help users easily understand strange animation characters, arouse users' interest in animation characters and related works, and make animation products more entertaining and attractive. As we all know, the necessary premise of a large number of advanced computer vision tasks is target detection, such as scene content understanding, event activity recognition and so on. Target detection is also widely used in many practical tasks, such as robot navigation, intelligent video surveillance, content-based image retrieval and augmented reality. However, current target detection also has some niche areas that are not involved, such as animation characters, and its detection performance in these areas is unknown. Although the research related to target detection has increased day by day in recent years, new research results and practical applications have been published . However, the detection accuracy of mainstream methods still needs to be improved, and can not be applied to practical and general target detection tasks. Therefore, animation character recognition and character intelligence analysis based on semantic ontology and Poisson equation has certain exploration and scientific research significance. The intelligent recognition of animation characters discussed by Lembo D and others is mainly based on target detection method. Target detection is one of the basic tasks in the field of computer vision. It needs to find the specific location of the specified target and accurately predict the category of the target . Among them, category prediction is actually a classification task. Its goal is to select the category label that is most consistent with the target object from all labels in the training set; The purpose of location is to accurately give the position of the object in the image. The position is generally represented by the bounding box. Finally, through classification and target location, the algorithm can automatically locate multiple target objects in a map. Alkhutov Y A and others said that the basic problem in target detection is classification, and the positioning problem can be realized by a variety of means. For example, in the traditional target detection algorithm, the sliding window algorithm is often used to intensively extract the window features in the image, and then the target category prediction and location are realized by classifying a large number of windows . From the existing research, for animation character model recognition, the consistency of recognition results in hierarchy can be effectively guaranteed through a priori knowledge. However, the existing research has not discussed how to build a standardized knowledge structure to define various parameters required for recognition, and these parameters have a very important impact on the quality of recognition. Therefore, based on the existing research, Chen J and others proposed to build a recognition book to form an ontology knowledge definition suitable for animation character recognition. The definition of recognition ontology is proposed for the animation character model, so that users can customize the recognition hierarchy, shape features, optimization algorithm and recognition boundary optimization parameters to obtain the optimal recognition effect . On the problem of recognition boundary consistency, aiming at the characteristic that the recognition boundary of three-dimensional model has equal circumference under different attitudes, the recognition boundary optimization is proposed by Poisson equation, so as to make the recognition boundary more consistent.
Considering the animated character model with obvious structural characteristics, the sum of geodesic distances of its external structural points has extreme characteristics. Therefore, the external structural points can be well detected through the protrusion function, and these stable feature points can be used to drive the first layer of coarse recognition . The protrusion function is the integral of the geodesic distance along the surface of the three-dimensional model, which is defined as equation 1:
Where: Give the initial label
Use Hungarian algorithm to solve the complete matching M in edge sets If M is the complete match in Find the unsaturated point If Find a node i If i is the saturation point of M, let There is an augmented path R from Calculate the value of
Give the initial label
Use Hungarian algorithm to solve the complete matching M in edge sets
If M is the complete match in
Find the unsaturated point
Find a node i
If i is the saturation point of M, let
There is an augmented path R from
Calculate the value of
Define the package phase difference, as shown in equations 7 and 8:
The superscript x and Y refer to the phase difference of row pixels and column pixels respectively.
Make the least squares on the
The solution of phase unwrapping can be obtained by solving the solution
The following matrix formula gives the normal equation of the above least squares matrix, namely discrete cosine transform (DCT) positive transform, as shown in equation 10:
The formula is the relationship between package phase difference and unfolding phase difference. By making a simple identity transformation, equation 11 is obtained:
In fact, equation 11 is a discrete Poisson equation on a
The above formula is valid for all rectangular grid points
It is concluded that the least square solution of the difference between the unwrapped phase difference and the wrapped phase difference is mathematically equal to the solution of the discrete Poisson equation with Neumann boundary condition on
This paper enhances the original animation image data. Data enhancement can prevent the over fitting of training to a certain extent, and plays an important role in the final recognition ability and generalization ability of the trained model. Common data enhancement methods include: horizontal or vertical flipping, random clipping, changing color contrast or brightness, affine or rotational transformation, adding noise and so on. There are different data enhancement methods for different tasks . In order to verify the effect of data enhancement on animation character detection, we use the basic algorithm target detection to test the original animation image data and the enhanced animation image data respectively.
As shown in Figure 1, the abscissa represents the number of iterations in the algorithm training process, and the ordinate represents the result value of the verification set in the training process. The red curve indicates the change of the verification set with the increase of the number of iterations when using the original data as the training set. The green curve represents the change of the verification set with the increase of the number of iterations when using the enhanced data as the training set . It can be clearly seen from Figure 1 that although the value of the red curve is slightly higher than that of the green curve before about 12500 iterations, the value growth of the red curve tends to be flat after that, while the value of the green curve continues to maintain the growth trend and soon exceeds that of the red curve. Finally, both tend to be stable. Finally, the value of the model trained with the original data is stable at about 0.65, while the value of the model trained with the enhanced data is stable at about 0.72, with an increase of 0.07. It can be seen that data enhancement plays a certain role in improving the performance of the algorithm.
As shown in Figure 2, the abscissa is the number of iterations in the algorithm training process, and the ordinate is the value of the loss function in the training process. The red curve indicates that the original data is used as the training set for training, and the value of the loss function changes with the increase of the number of iterations. The green curve represents the change of the value of the loss function with the increase of the number of iterations when using the enhanced data as the training set. It can be clearly seen from the figure that compared with the original data, when using the enhanced data as the training set for training, the convergence curve is more stable and the loss function value of final convergence is lower .
In this algorithm, a discrete Poisson equation with Neumann boundary condition is formed for the singular points in the interferogram, and the least square solution is obtained to obtain the correct unfolding phase. Next, the phase unwrapping algorithm in this paper is verified by experiments. The experimental sample is RA 0.094m standard roughness sample block, and the image size is 512 pixels × 512 pixels. Figure 3 is a two-dimensional outline of the phase jump line.
The principle of topography measurement is expressed in the integral form of phase diagram along the x-axis, so the phase unwrapping is also carried out along the x-axis. Firstly, the singular point region is judged. It is assumed that in the interferogram, there is at least one horizontal line that can be correctly wrapped by the phase unwrapping algorithm of equation 5. On this line, all pixels are “good points”. Based on this line, if any square four pixel point formed by the adjacent line and the reference line meets the condition that the sum of the wrapping phase difference is zero, it is correct to unwrap the point on the adjacent line, and the line can be used as the reference line to continue the unwrapping of the next adjacent line. If any square pixel formed by the reference line and the adjacent straight line does not meet the condition that the sum of the wrapped phase difference is zero, it is considered that there are singular points on the connecting line of the pixel. At this time, the phase unwrapping algorithm based on the solution of discrete Poisson equation in the previous section is applied to solve the unwrapping phase in the sense of least squares . In order to reduce the amount of calculation, a small rectangular area with a size of 100 pixels×100 pixels is set at the jump contour of singular points, and the phase unwrapping is carried out according to the programming calculation of the above phase unwrapping algorithm steps. In order to further verify the performance of the algorithm, the recognition quality of this method and the traditional algorithm is compared. The recognition quality mainly depends on two aspects: 1) whether the recognition results are globally consistent in semantic structure; 2) Whether the recognition boundary of the model sequence is consistent. Let the model recognition result of frame X be equation 15:
The traditional algorithm only uses the normal angle between patches as the optimization constraint, so it is difficult to ensure that the recognition boundary converges to the joint position. This method adopts equal perimeter line extraction, and the recognition boundary is not only very smooth, but also has better consistency. In addition, the traditional algorithm uses human proportion as semantic knowledge for semantic label recognition. This method has great limitations and can only be applied to human models. This method constructs a semantic tag recognizer, which only needs to update the training data to get the hierarchical consistency recognition of different models. In conclusion, this method has better universality and applicability.
With the advent and popularity of the era of artificial intelligence, more and more industries begin to try to use artificial intelligence to solve problems or combine artificial intelligence to improve the quality of their products and the attraction to users, so as not to be eliminated in the increasingly competitive market. It is understood that at present, there are few successful cases of the combination of animation products and artificial intelligence elements, and this field is still a blue ocean. Therefore, this paper attempts to apply artificial intelligence to animation images, and realize the intelligent analysis of animation characters by means of target detection based on semantic ontology and Poisson equation. By using ontology to describe role recognition, it can make it semantic. This paper uses the improved Poisson algorithm to solve the problem of intelligent analysis. Finally, based on this correlation degree, the appropriate role recognition and intelligent analysis methods are given, and finally an application service for mobile client is built. Through experiments, it can be found that selecting the optimal parameters through ontology can significantly improve the recognition quality.
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