Research On Subjective And Objeoctive Evaluation Of Optical Illusion Apparel Images

Optical illusion is an artistic phenomenon with design and interest.It can make lines,shapes,colors,textures,etc.into patterns with visual deception,which makes people's visual focus shift,thus superior to objective actual appearance effect.With the application and popularization of optical illusion design,people often come into contact with illusion apparel,window and building in their lives.Among them,there is illusion through the structure of the garment,to achieve the effect of visually modifying the body shape and making up for the body defects,and illusion displayed which serves to attract the consumers' attention,or illusion architectural design which is used to expand the space.However,the research on optical illusion in the field of textiles and garments is more subjective design to meet some of the designer's needs and purposes,but lacks objective evaluation and analysis of illusion apparel.Also the subjective state of mind and objective physiological reactions when people see these optical illusion designs.So that the research and development of the illusion apparel is greatly limited.In view of the objective evaluation of optical illusion apparel,it is necessary to further explore the problem.In this paper,the combination of eye movement test and heart rate test is used to analyze the difference between various types of optical illusion apparel through the evaluation index of eye tracker,and the activity change of the autonomic nervous system Determine the objective physiological response of the subject when viewing the illusion apparel,and combine the subjective evaluation to analyze the reasons for the objective response and the connection between subjective and objective evaluation.Finally,the image processing technology is used to extract the feature parameters of the image of the illusion apparel,and an automatic evaluation model of the sensory comfort level of the illusion apparel is established.The specific research contents and results are as follows:(1)The eye movement experiment is divided into three parts:pattern design,actual clothing and various types of contrast.Through the analysis of the difference between the pattern design and the actual clothing,it is concluded that the actual clothing makes the subject look longer for the first time,the pupil diameter is larger,and it is more attractive to the subject.Meanwhile,there is a clear difference in the area and degree of attention between the fashion design professional and the non-fashion design professional subjects,and the overall attention of the clothing professional subjects is greater.Through comparative analysis of various types of clothing,it is found that the illusion pattern is more attractive to the subject than the general pattern.In addition,in the factors affecting the attraction of the dislocation pattern to the person,the placement position is larger than the pattern design,and in practical applications such as display design,the placement position is first considered,followed by the pattern design.(2)Heart rate experiment requires both recording of electrocardiogram and assisted imaging with eye tracker.Through the study of the influence of the illusion skirt on the human visual and autonomic nervous system and subjective feelings,the illusion pattern will make people feel uncomfortable,such as "anxiety","dizziness" and "disgust",and also have a "fun" feeling.Then,the objective response of the human body is:the pupil diameter is reduced,the R-R interval is shortened(the heartbeat is accelerated),the LF/HF value is increased(sympathetic nerve is active),and the HF value is decreased(parasympathetic nerve is negative).(3)Based on the gray level co-occurrence matrix,wavelet analysis and back propagation(BP)neural network,the automatic evaluation method of the sensory comfort of the optical illusion apparel has a high classification accuracy rate,and the classification effect is stable and can be more accurate.The prediction of the visual sensory level under the line thickness and the pitch of the optical illusion pattern provides a certain reference for the application of the illusion pattern in textiles and garments.