Research On Luminance Perception Based On Spatial Light Field

The rapid development of display and lighting technology has made the spatial light environment in which people are located more and more complicated,which also causes many visual health problems,and this puts higher demands on the measurement and evaluation of the light environment.Although existing measurement methods can obtain objective parameters such as luminance and illuminance,most of them reflect the luminescence characteristics of external objects such as light sources,which do not completely match the human eye perception of light.In this case,it is especially important to establish a light environment measurement and evaluation method based on the human eye perception effect.The human eye perception of light has luminance,color,stroboscopic,etc.Among them,the brightness and darkness produced by luminance is the first in the process of human perception,which is an important dimension of human perception of light.At present,the objective measurement method of luminance is relatively perfect,and there is little research on the evaluation of human eye luminance perception combined with spatial light environment information.Therefore,it is necessary to establish an accurate and reliable luminance perception model,which is of great significance for correctly evaluating the human eye perception of the ambient luminance level,formulating relevant visual health standards,and solving the current visual health problems.In this paper,aiming at the problem that the luminance of the current measurement does not match the perception of luminance of the human eye,the correlation technology of the spatial light field and the principle of luminance perception of the human eye are studied,and the calculation model of brightness based on the spatial light field is established.It realizes the conversion process from measuring luminance to perceived brightness,and provides a reliable reference standard for evaluating the perception of brightness of human eyes.The main contents of the paper are summarized as follows:Firstly,the paper studies the definition,characterization and recording methods of spatial light field,and analyzes the human eye perception of light field information.The paper uses Lytro-illum light field camera as a platform to study and realize its data decoding and refocusing.The algorithm realizes the dimensional reduction operation of the light field from 4D to 2D.In addition,the paper also provides a scheme for obtaining 2D luminance information from the light field.Secondly,the thesis analyzes the structure and luminance perception principle of the human eye in detail,points out the key role of pupil diameter in the process of luminance perception,and designs and implements a series of experiments.The paper finally obtains a pupil diameter calculation method that comprehensively considers the luminance,the angle of view of the illuminating surface,and the position of the illuminating surface in the field of view.Based on this,the calculation model of perceived brightness is established.Finally,based on the established sensory brightness calculation model,the paper carries out relevant experiments to verify the accuracy of the model and the application reliability in the actual scene.The subjective experiment is carried out for the correlation between the brightness and the actual luminance perception effect of the human eye.It shows the matching between brightness and the actual luminance perception of the human eye.In addition,based on the common application scenarios of watching TV and mobile phones,the paper uses the established luminance perception model to simulate the perceived brightness.Based on this,the paper draws a reasonable range of luminance for watching TV and mobile phones.