秋色叶树木树冠色彩特性对其观赏效应的影响

doi:10.11707/j.1001-7488.20211104

Abstract

Abstract:

Objective: The crown of autumn-color trees was investigated to construct and identify the key indices affecting scenic beauty estimation (SBE) based on HSV color space, and to reveal the quantitative relationships between color indices and SBE, in order to provide a basis for deepening studies on forest color and improving indicators system for assessing ornamental effect. Method: 190 photos of individual trees of 38 autumn-color species common in northern China during five coloration periods were investigated by color classification (dominant color, complementary color and intersperse color) of the photos using Photoshop and ColorImpact software, the values and area proportions of HSV (hue, saturation and value of color) color were extracted by category, synthesize dominant, assistant and whole indexes, and the three elements synthesized index, chromatic aberration indexes (interior of chromatic aberration, and external of chromatic aberration), the deviation indexes, and basic quantity indexes were calculated. Then psychophysical method were employed to acquire the SBE value of the pictures. Software SPSS and DPS were taken to analyze the correlation between the color indexes and SBE statistically. A multiple regression model was established based on the result, and the key indexes affecting SBE were identified. Result: The Pearson correlation analysis showed that the 5 special indexes affecting SBE(|r|>0.500, P < 0.01), saturation of assistant color (r=0.539, P < 0.01), saturation of whole colur (r=0.533, P < 0.01), biased exponent of dominant color and assistant color (r=-0.515, P < 0.01), relative area of dominant color (r=-0.521, P < 0.01), and relative area of whole color (r=-0.519, P < 0.01). 6 color indexes such as value, the chromatic aberration of hue, the interior chromatic aberration euclidean, the external chromatic aberration euclidean, the deviation, and the counting index, of which 12 indexes had an extremely significant correlation (|r|>0.300) with SBE). The correlaton between indexes mainly regards the between different indexes in the same index group. Among the three elements of color, both saturation and value have had a good positive linear relationship with SBE, while hue had no linear relationship with SBE. Among the chromatic aberration indexes, the chromatic aberratin of hue had a significantly negative linear relationship with SBE. The external chromatic aberration euclidean, biased exponent, and other external of chromatic aberration of single primary color possess a negative linear relationship with SBE. In contrast, the Interior chromatic aberration had a positive linear relationship or quadratic curve (level first and then rise) relationship with SBE. Among the deviation indexes and basic number indexes, the deviation of hue, the deviation of value, the relative area of color, and the maximum number of colors were optimally in a quadratic curve relation with SBE. The SBE model is a quadratic polynomial(R²=0.807). As illustrated in the model, a high SBE value is given to the colorscape of trees with a high ratio of hanging leaves, with hues closer to yellow-green, with a pure bright whole color, with distinct gradations of values. Among the two factors of saturation of whole color, the color landscape with strong value of dominant color and assistant color and value of contrast and harmonious saturation of dominant color and assistant color has good viewing effect. Conclusion: The sample color was allocated into different categories and then re-synthesized by categories, thereby realizing quantitative calculation of color indexes. Chromatic aberration and the deviation have explicit physical meanings and are effective indexes for quantifying the dimensionality reduction of the color index and improving evaluation efficiency. Containing 6 key indexes such as the chromatic aberration of dominant color hue and assistant color hue, saturation of whole saturation, biased exponent of dominant and assistant, the external chromatic aberration euclidean of dominant color and assistant color saturation, the deviation of whole color value, and relative area of whole color, the SBE model, can be used as an index system for comprehensive evaluation of SBE.

Key words: color of the tree, color attribute, ornamental effect of color

CLC Number:

S731.7

Na Jia,Wei Yan,Jiuxi Shi, Geriletu,Xiaoyu Che. Influence of Crown Color Characteristics on the Ornamental Effect of Autumn-Color Trees[J]. Scientia Silvae Sinicae, 2021, 57(11): 37-48.

Figures/Tables 6

Fig.1

Table 1

Pearson correlation coefficient of color indexes"

类 Type	组 Group	指标Index	SBE	X₁	X₂	X₃	X₄	X₅	X₆	X₇	X₈	X₉	X₁₀	X₁₁	X₁₂	X₁₃	X₁₄	X₁₅	X₁₆	X₁₇	X₁₈	X₁₉	X₂₀	X₂₁	X₂₂
色彩三要素 Elements of color	彩度 Saturation	X₁	0.479^**	1
		X₂	0.539^**	0.812^**	1
		X₃	0.533^**	0.976^**	0.905^**	1
	明度 Value	X₄	0.307^**	0.507^**	0.503^**	0.537^**	1
	明度 Value	X₅	0.302^**	0.501^**	0.505^**	0.530^**	0.998^**	1
	色相 Hue	X₆	0.023	-0.326^**	-0.268^**	-0.321^**	-0.244^**	-0.249^**	1
	色相 Hue	X₇	0.047	-0.401^**	-0.333^**	-0.397^**	-0.255^**	-0.256^**	0.814^**	1
色相差 Chromatic aberration	色相差 Hue of chromatic aberration	X₈	-0.188^*	-0.095	-0.063	-0.092	0.152^*	0.168^*	-0.015	-0.058	1
	色相差 Hue of chromatic aberration	X₉	-0.167^*	-0.053	-0.043	-0.057	0.137	0.156^*	0.048	-0.078	0.954^**	1
	欧式内色差Interior of chromatic aberration	X₁₀	0.362^**	0.354^**	0.364^**	0.372^**	0.342^**	0.339^**	-0.246^**	-0.260^**	0.288^**	0.276^**	1
	欧式内色差Interior of chromatic aberration	X₁₁	0.316^**	0.284^**	0.287^**	0.296^**	0.225^**	0.221^**	-0.201^**	-0.207^**	0.324^**	0.308^**	0.970^**	1
	欧式外色差External of chromatic aberration	X₁₂	-0.355^**	-0.589^**	-0.500^**	-0.586^**	-0.055	-0.037	0.210^**	0.210^**	0.827^**	0.771^**	0.038	0.088	1
	欧式外色差External of chromatic aberration	X₁₃	-0.300^**	-0.473^**	-0.399^**	-0.473^**	0.043	0.063	0.232^**	0.160^*	0.850^**	0.864^**	0.086	0.122	0.964^**	1
	偏移指数 Biased exponent	X₁₄	-0.439^**	-0.520^**	-0.382^**	-0.505^**	-0.458^**	-0.441^**	-0.169^*	-0.040	0.519^**	0.461^**	-0.072	0.013	0.596^**	0.527^**	1
		X₁₅	-0.515^**	-0.464^**	-0.427^**	-0.480^**	-0.405^**	-0.393^**	-0.213^**	-0.328^**	0.530^**	0.485^**	-0.037	0.035	0.600^**	0.540^**	0.814^**	1
		X₁₆	-0.492^**	-0.401^**	-0.392^**	-0.427^**	-0.388^**	-0.376^**	-0.183^*	-0.378^**	0.518^**	0.541^**	-0.016	0.052	0.556^**	0.553^**	0.764^**	0.967^**	1
离差 Deviation	离差 Deviation	X₁₇	-0.377^**	-0.493^**	-0.456^**	-0.518^**	-0.243^**	-0.218^**	-0.121	0.127	0.567^**	0.471^**	-0.032	0.037	0.687^**	0.605^**	0.729^**	0.574^**	0.487^**	1
离差 Deviation	离差 Deviation	X₁₈	0.150^*	-0.050	0.072	-0.005	-0.450^**	-0.444^**	0.014	-0.030	-0.079	-0.053	-0.021	0.052	-0.094	-0.110	0.247^**	0.186^*	0.176^*	0.069	1
基本数量指标 Basic quantity index	相对面积 Relative area	X₁₉	0.521^**	0.234^**	0.228^**	0.249^**	0.013	0.003	0.003	-0.027	-0.129	-0.119	0.499^**	0.457^**	-0.224^**	-0.208^**	-0.180^*	-0.161^*	-0.140	-0.237^**	0.113	1
		X₂₀	0.406^**	0.230^**	0.223^**	0.255^**	-0.012	-0.023	-0.113	-0.116	-0.119	-0.132	0.392^**	0.395^**	-0.267^**	-0.275^**	-0.021	-0.044	-0.043	-0.164^*	0.165^*	0.745^**	1
		X₂₁	0.519^**	0.121	0.148	0.143	-0.213^**	-0.221^**	0.043	0.016	-0.170^*	-0.147	0.374^**	0.397^**	-0.221^**	-0.219^**	-0.042	-0.046	-0.025	-0.188^*	0.320^**	0.886^**	0.743^**	1
	计数 Number of colors	X₂₂	0.302^**	0.114	0.171^*	0.133	0.083	0.092	-0.146	-0.106	0.028	0.036	0.333^**	0.327^**	-0.060	-0.026	0.092	0.040	0.042	0.039	0.289^**	0.421^**	0.392^**	0.513^**	1
	计数 Number of colors	X₂₃	0.109	-0.189^*	-0.138	-0.201^**	-0.288^**	-0.282^**	0.103	0.181^*	-0.081	-0.098	0.020	0.059	0.003	-0.031	0.219^**	0.117	0.090	0.163^*	0.169^*	0.236^**	0.275^**	0.322^**	0.243^**

Table 1

Fig.2

Fig.3

Fig.4

Table 2

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指标 Index	符号 Sign	非标准化系数 Unstandardized coefficients	标准化系数 Standardized coefficients	偏相关系数 Partial correlation coefficients	t	P
常量Constant		2.093 1	4.995 3
主辅色色相差Chromatic aberration of dominant color and assistant color hue	X₈	-0.011 0	-0.228 2	-0.243 9	3.269 5	0.001 3
全色彩度Saturation of whole color	X₃	0.019 7	0.284 5	0.405 2	5.761 5	0.000 1
主辅色偏移指数Biased exponent of dominant color and assistant color	X₁₅	-0.005 9	-0.149 3	-0.408 9	5.825 1	0.000 1
主辅色欧氏外色差External chromatic aberration euclidean of dominant color and assistant color	X₁₂	0.010 7	0.360 3	0.332 0	4.576 2	0.000 1
全色明度离差Deviation of whole color value	X₁₈²	0.000 2	0.044 0	0.188 3	2.492 0	0.013 7
全色相对面积Relative area of whole color	X₂₁	5.136 5	0.155 5	0.290 4	3.944 9	0.000 1
全色相对面积Relative area of whole color	X₂₁²	-2.600 5	-0.022 1	-0.192 4	2.548 9	0.011 7

Influence of Crown Color Characteristics on the Ornamental Effect of Autumn-Color Trees

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