| Under the influence of "micro age",micro learning resources are supported and developed to meet the personalized learning needs of learners.In the context of COVID-19 prevention and control in the past two years,the Ministry of Education has made great efforts to develop online teaching resources to ensure "continuous school suspension",and the demand for online education has further increased.In addition,with the improvement of learners’ visual literacy,the requirements for the quality of online teaching videos are also increasing.Therefore,it is of great significance to study the optimization of teaching video in visual experience.Based on visual perception theory and multimedia cognitive learning theory,this study developed video evaluation tools by referring to mature video analysis scales,selected national excellent courses of Science,engineering,literature and art,and conducted content analysis of video image form factors.The advantages and characteristics of the basic elements(color,composition,text)and personal factors(teacher’s eyes,teacher’s posture,teacher’s expression)of teacher’s pictures in different subjects are compared and studied.Through eye movement experiment and questionnaire survey,the eye movement data(total fixation time,fixation times,fixation path map,fixation hot spot map)were analyzed.Combined with the discussion of questionnaire survey results,it was found that :(1)due to different scenes,the influence order of teacher’s picture form factors on learners’ sight line was different.In the teacher panorama picture,learners first pay attention to the basic elements of the picture,especially the text elements.In teacher medium shot,color and text information in the background first attract learners’ visual attention;In the teacher’s close-up picture,there is little difference between the basic elements and the teacher’s influence on learners’ vision,while the teacher’s influence is slightly better.On the whole,learners’ vision was slightly more affected by other elements than teachers’.More learners give priority to the color information and text in the picture,especially the bottom subtitle and prompt information.(2)Learners have different visual tendencies to form factors in different areas of the picture.In the PPT area,learners of science course were assigned the most visual attention.In engineering courses,learners are more inclined to watch THE PPT in the background,and their eyes spend the longest time in this area.The subtitle area at the bottom becomes the second interest area of learners.In the literature course,learners are more inclined to watch the teacher’s area;In art courses,the visual distribution of most learners in each area is relatively balanced,with little difference between each other,and the visual orientation of learners in the middle-scene teacher area is slightly higher than that of other areas.According to the research results,some suggestions are put forward to optimize the design of basic elements of online teaching videos and teachers’ personal factors.Colors adopt the design premise of subject attributes,the design strategy of maintaining emotional stability,and the design mode of art matching.Composition should be careful not to switch between different scenes,and make good use of medium and close shots;In terms of text,attention should be paid to the design of commentary with good vision,clues and hints highlighting important knowledge points,and the opening of bullet screen function for some disciplines.Teachers avoid meaningless eye guidance and keep eye contact with learners.Increased use of indicative gestures;Reduce redundant expressions and present them intermittently,so as to improve the sense of interaction between teachers and students by affecting learners’ emotional experience. |
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