Hand-drawn Line Graph Automatic Teaching Based On Fuzzy Technology

The painting is an important part of children's education, and the learning of line drawing is one of the compulsory art class in primary school. In order to meet the needs of the actual painting, the drawing skills which connecting the shape of the object by smooth line graphics, freely expressing what they see and think to a picture become the basic art requirement of children teaching. At present, alleviate teachers' traditional teaching pressure and lack of education resources demand imminently. At the same time, along with the information technology popularization, the ecological protection of the voice is rising, the research of young students' automatic drawing teaching technology has become a hot spot.Different with handwriting the graphic lines strokes element have unbounded set, the start or end of a stroke has no strict rules with changeable stroke forms. Besides the strokes exist more geometric relations so that it can't directly apply the automatic teaching methods in drawing teaching. The automatic drawing teaching system which service to young users must meet one of the basic requirements is that the structure drawing correct rate is not too high, the focus is on multi grade evaluation of the drawing quality. The implementation of hand-drawn line graphics automatic teaching need to break through the difficulties are mainly as follows:(1) the drawing tracking, analysis and guidance process of the strokes;(2) the painting quality evaluation after passing the structure recognition test;(3) the establishment and mark recognition models of poor quality drawing etc. This paper explores the automatic teaching method based on fuzzy techniques, results and innovations are as follows:1. The definition of a high freedom degree drawing of open-loop and closed-loop lines and their unique relationships. The line graph is divided into two categories as single and multi line subgraph. Among them, the single one is divided into open loop and closed loop subgraph, spatial relation between subgraphs is divided into single line and multi line diagram relations. Besides, this paper analyzes the actual drawing characteristics of young children and proposes the concept of real-time guide tracking to drawing process and quality evaluation.2. The formal drawing structure knowledge base and rough structure recognition description of the graph are putting forward. Teaching knowledge is the template of hand-drawn line graphics which is drawn by the teacher. It uses to guide the actual drawing process tracking, recognize the drawing structure and evaluate the drawing quality. As a free type line drawing automatic teaching, there is no need for precise identification of the drawing structure, the correct rate is greater than or equal to a threshold can be set.3. The design for single line and multi line drawing fuzzy quality analysis system. After passing structure recognition test, the drawing quality fuzzy evaluation is carried out according to the drawing features of the key point and the endpoint connection angle to open loop lines; stroke structure, scale, the angle and the arc to closed loop lines; relative distances and the centroid distance to multi-line graph. In which builds a real painting quality fuzzy membership degree vector, analyzing the vector similarity with template one to get integrated quality grade evaluation.4. The establishment of poor quality recognition model and its marking strategy. The poor quality forms of single line subgraph mainly cause by length deviation, the pen number of folding wave line are incorrect, adjacent lines link endpoints do not overlap or strokes have cross sections etc; The multi-line subgraph poor quality forms behave in the line relations and subgraph relations etc.The homework checking contrast experiments between teacher and our system show that the difference indexes about structure identification, evaluation and quality marking effect of our method are consistent with the subjective evaluation results of teachers, which reaches the practical requirement, the guidances are objective as well.