Experimental study on the brightness perception of landscape lighting with single landscape elements
1. School of Architecture, Tianjin University, Tianjin 300072, China; 2. School of Civil Engineering, Shenyang Jianzhu University, Shenyang, 110168, China Abstract: The effect of landscape lighting is affected by the lighting effects of the landscape elements contained in the scene. In view of the typical landscape elements in classical gardens and nature reserves, this paper considers the visual characteristics in low-brightness and weak contrast environments based on intermediate vision, and evaluates the visual perception of the corresponding scenes by changing the physical stimulation in the landscape lighting scene. The statistical software is used to analyze the corresponding measurement results and evaluation results, and the brightness stimulation range corresponding to the visual experience and the corresponding quantitative model are obtained. Keywords: low brightness intermediate vision quantitative research landscape elements subjective evaluation 1 Introduction Different landscape elements form different spatial relationships and levels in the night landscape according to the relationship between light and dark, size, and distance. As a basic framing unit, landscape elements play an important role in shaping the overall visual effect of the night landscape. With the recognition and desire of traditional culture and art, classical gardens and nature reserves have gradually become a special and distinctive part of landscape lighting. The survey results show that the illumination of such scenes is mostly at the intermediate visual level, the brightness is low, and the pair is relatively weak. At this time, the ability of the human eye to distinguish the color is reduced, and the feeling of the scene effect depends more on the change and contrast of the brightness. This study focuses on the landscape characteristics of classical gardens and nature reserves, and considers the human visual characteristics. It selects several elements commonly used in landscape lighting scenes, and subjectively evaluates the visual perception of people in different brightness levels. Corresponding quantitative range and formula. Through the relationship between environmental physical stimulation and subjective feeling established by the Institute, it not only provides theoretical basis and model for the evaluation of overall visual effects, but also useful exploration of existing research fields, making research methods more systematic and standardized. 2 Experimental content 2.1 Experimental subjects This study selected buildings, trees, and roads that are common in the scene as research objects. At the same time, the environment of the scene is controlled under the condition of low brightness and weak contrast based on intermediate vision. see picture 1. 2.2 Experimental conditions 1. Subject analysis Figure 2 In the gender analysis and evaluation experiment, there were 55 participants, including 25 males and 30 females. The subjects had normal vision, and the gender and age ratios are shown in Figure 2 and Figure 3. . 2.3 Experimental scale design Considering the content and characteristics of the research, three visual evaluation items were selected: brightness perception, contrast feeling, total impression, and subjective evaluation of the visual effects of each landscape element in different scenes in the experiment. See Table 1. 
2. The instrument and equipment experiment was carried out in the “Multi-function Laboratory of Light Color Measurement and Subjective Evaluation†of the Institute of Building Technology of Tianjin University of Architecture. The area enclosed by the darkroom in the laboratory used is about 40 square meters. The instruments used mainly include LCD liquid crystal panel projectors (EPSON EMP-7800), Topcon BM-7 color luminance meter, and illuminance meter. 