Abstract
The partial differential equation learning model is applied to another high-level visual-processing problem: face recognition. A novel feature selection method based on partial differential equation learning model is proposed. The extracted features are invariant to rotation and translation and more robust to illumination changes. In the evaluation of students’ concentration in class, this paper firstly uses the face detection algorithm in face recognition technology to detect the face and intercept the expression data, and calculates the rise rate. Then, the improved model of concentration analysis and evaluation of a college Chinese class is used to recognize facial expression, and the corresponding weight is given to calculate the expression score. Finally, the head-up rate calculated at the same time is multiplied by the expression score as the final concentration score. Through the experiment and analysis of the experimental results in the actual classroom, the corresponding conclusions are drawn and teaching suggestions are provided for teachers. For each face, a large neighborhood set is firstly selected by the k -nearest neighbor method, and then, the sparse representation of sample points in the neighborhood is obtained, which effectively combines the locality of k -nearest neighbor and the robustness of sparse representation. In the sparse preserving nonnegative block alignment algorithm, a discriminant partial optimization model is constructed by using sparse reconstruction coefficients to describe local geometry and weighted distance to describe class separability. The two algorithms obtain good clustering and recognition results in various cases of real and simulated occlusion, which shows the effectiveness and robustness of the algorithm. In order to verify the reliability of the model, this paper verified the model through in-class practice tests, teachers’ questions, and interviews with students and teachers. The results show that the proposed joint evaluation method based on expression and head-up rate has high accuracy and reliability.
Highlights
In the previous studies on the evaluation of students’ concentration in college Chinese classes, most of them adopted homework test, questionnaire scale, and instrument measurement
Concentration in a college Chinese classroom; third, there is no reasonable partial differential equation analysis and evaluation model of focus for face recognition between different evaluation indicators, which is greatly affected by a certain indicator and cannot effectively reduce the error; and fourthly, the recognition effect of the facial expression recognition algorithm is not ideal, leading to a certain error in the evaluation of concentration
This paper proposes a learning model of partial differential equation for feature extraction and applies it to face recognition in high-level visual-processing problems
Summary
In the previous studies on the evaluation of students’ concentration in college Chinese classes, most of them adopted homework test, questionnaire scale, and instrument measurement. Many researchers have realized the importance of concentration on students’ academic performance through many experimental studies, and the method to evaluate students’ concentration in a college Chinese class has emerged. It has been shown that the better the concentration of the college Chinese class is, the better the corresponding performance of in-class practice tests and the passing rate of teachers’ questions are. It verifies the reliability of the evaluation of students’ concentration in the college Chinese class based on expression and head-up rate
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