Hyperspectral camouflage effect evaluation based on spectral indices

背景类型	光谱指数	定义	原理描述
注：ρ_x表示波段为x/nm处的反射率。
林地背景	NDVI	$\frac{ρ_{860} - ρ_{650}}{ρ_{860} + ρ_{650}}$	植被在860 nm处存在反射峰，650 nm处吸收强烈，因此该指数为正且值较大时表示植被，该指数值越接近于1表示越可能为植被。
	GVI	$\frac{ρ_{550} - ρ_{400}}{ρ_{550} + ρ_{400}} + ρ_{500}$	植被在400 nm~650 nm范围内反射率整体较低且变化不大，故该指数为正且值较小表示植被，一般植被的取值范围为0～0.3。
	NVI	$\frac{ρ_{900} - ρ_{800}}{ρ_{900} + ρ_{800}} + ρ_{850}$	植被在800 nm~1 000 nm范围内反射率整体较高，900 nm和800 nm处的反射率基本相同，故该指数值在0.3~0.6范围内表示植被。
雪地背景	NDSI_NIR	$\frac{ρ_{550} - ρ_{960}}{ρ_{550} + ρ_{960}}$	雪地在可见光到近红外范围内反射率呈缓慢下降趋势，960 nm处反射率低于550 nm处，但幅度相差较小，因此该指数为正且较小时表示积雪，一般积雪在0~0.1范围内。
雪地背景	MSI	$\frac{ρ_{450} + ρ_{750} + ρ_{950}}{3}$	雪地在可见光到近红外范围内反射率整体很高，达到0.7左右，该指数选取特定波段反射率均值，其值在0.6~0.8范围内表示雪地。

Table 2. Parameters of Resonon Pika L

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Table 2. Parameters of Resonon Pika L

参数名称	数值
光谱范围/nm	400～1 000
光谱分辨率/nm	2.1
光谱通道数	281
空间通道数	900
每秒最大帧数/fps	249
位深度	12
质量/kg	0.6
尺寸/cm	10.0×12.5×5.3
连接方式	USB 3.0
孔径	f/2.4
像元尺寸/μm	5.86
平均RMS半径/μm	6

Table 3. Mean value of spectral indexes of target and background under forest land background
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Table 3. Mean value of spectral indexes of target and background under forest land background
目标或背景类型 NDVI GVI NVI
A 0.0369 0.8288 0.4748
B 0.3916 0.0804 0.3808
C 0.5597 0.2517 0.5492

Table 4. Spectral index difference and weight coefficien k before and after target camouflage
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Table 4. Spectral index difference and weight coefficien k before and after target camouflage
差值与权重 NDVI GVI NVI
|A-B| 0.3547 0.7484 0.0940
k 0.2963 0.6252 0.0785

Table 5. Spectral consistency coefficient SCC_veg before and after target camouflage
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Table 5. Spectral consistency coefficient SCC_veg before and after target camouflage
光谱指数差值 NDVI GVI NVI SCC_veg
|A-C| 0.5228 0.5772 0.0744 0.5216
|B-C| 0.1681 0.1713 0.1684 0.1701

Table 6. Spectral distance and spectral angle between target and background under forest land background
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Table 6. Spectral distance and spectral angle between target and background under forest land background
目标类型 D cosα
A 7.3268 0.8060
B 2.0190 0.9703

Table 7. Mean value of each spectral index of target and background under snow background
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Table 7. Mean value of each spectral index of target and background under snow background
目标或背景类型 NDSI_NIR MSI
D −0.7627 0.4228
E −0.0375 0.6716
F 0.0942 0.6164

Table 8. Spectral index difference and weight coefficient k before and after target camouflage
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Table 8. Spectral index difference and weight coefficient k before and after target camouflage
差值与权重 NDSI_NIR MSI
|E-D| 0.7253 0.2488
k 0.7446 0.2554

Table 9. Spectral consistency coefficient SCC_snow before and after target camouflage
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Table 9. Spectral consistency coefficient SCC_snow before and after target camouflage
光谱指数差值 NDSI_NIR MSI SCC_snow
|D-F| 0.8569 0.1936 0.6875
|E-F| 0.1316 0.0552 0.1121

Table 10. Spectral distance and spectral angle between target and background under snow background
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Table 10. Spectral distance and spectral angle between target and background under snow background
目标类型 d cosφ
D 6.4600 0.7736
E 2.3267 0.9927

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Yaxiong OUYANG, Ruihui PENG, Jianjun SHA, Lin ZHANG, Kaiyi ZHANG. Hyperspectral camouflage effect evaluation based on spectral indices[J]. Journal of Applied Optics, 2023, 44(3): 523

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Paper Information

Category: Research Articles

Received: May. 18, 2022

Accepted: --

Published Online: Jun. 19, 2023

The Author Email: Ruihui PENG (pengruihui@hrbeu.edu.cn)

DOI:10.5768/JAO202344.0301008

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Definition and principle description of spectral indices

Table 1. Definition and principle description of spectral indices

Table 2. Parameters of Resonon Pika L

Table 2. Parameters of Resonon Pika L

Table 3. Mean value of spectral indexes of target and background under forest land background

Table 3. Mean value of spectral indexes of target and background under forest land background

Table 4. Spectral index difference and weight coefficien k before and after target camouflage

Table 4. Spectral index difference and weight coefficien k before and after target camouflage

Table 5. Spectral consistency coefficient SCCveg before and after target camouflage

Table 5. Spectral consistency coefficient SCCveg before and after target camouflage

Table 6. Spectral distance and spectral angle between target and background under forest land background

Table 6. Spectral distance and spectral angle between target and background under forest land background

Table 7. Mean value of each spectral index of target and background under snow background

Table 7. Mean value of each spectral index of target and background under snow background

Table 8. Spectral index difference and weight coefficient k before and after target camouflage

Table 8. Spectral index difference and weight coefficient k before and after target camouflage

Table 9. Spectral consistency coefficient SCCsnow before and after target camouflage

Table 9. Spectral consistency coefficient SCCsnow before and after target camouflage

Table 10. Spectral distance and spectral angle between target and background under snow background

Table 10. Spectral distance and spectral angle between target and background under snow background

Table 5. Spectral consistency coefficient SCC_veg before and after target camouflage

Table 5. Spectral consistency coefficient SCC_veg before and after target camouflage

Table 9. Spectral consistency coefficient SCC_snow before and after target camouflage

Table 9. Spectral consistency coefficient SCC_snow before and after target camouflage