A visible light waveband atmospheric transmissivity measuring method based on a single frame coloured image
An atmospheric transmittance and color image technology, applied in the optical field, can solve the problems of low atmospheric transmittance accuracy and limited application range.
Active Publication Date: 2016-09-28
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
View PDF6 Cites 9 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
The accuracy of the calculated atmospheric transmittance is not high; limited direct measurement methods are limited to specific scenarios, and most of them rely on specific light sources (such as stars) or active lasers, and their application range is limited, such as: Weib-Wrana et al. (1995) The laser is used to measure the atmospheric transmittance, but under the condition of long-distance observation, the accuracy of this method to measure the atmospheric transmittance decreases with the increase of the propagation path (mainly due to the divergence of the laser and the limited laser energy)[4]
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0093] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0094] Such as figure 1 As shown, a method for measuring atmospheric transmittance in the visible light band based on a single-frame color image, first uses a color camera to image the target scene, obtains a single-frame color RGB digital image of the target scene, and then obtains the required Atmospheric transmittance at wavelength, including the following steps:
[0095] (1) Convert the single-frame color RGB digital image of the target scene into an absolute radiometric image according to the absolute radiometric calibration parameters of the color camera;
[0096] (2) Combining the atmospheric scattering model and dark channel prior statistical theory, the absolute radiation image is processed to obtain the atmospheric background light map in the absolute radiation image and the dark channel of the two-dimensional scene (one of red R, gree...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
A visible light waveband atmospheric transmissivity measuring method based on a single frame coloured image is disclosed. The method includes steps of (1) converting a single frame coloured RGB digital image of a targeted scene into an absolute radiation image according to absolute radiation calibration parameters of a color camera, (2) processing the absolute radiation image by combining an atmospheric scattering model and a dark channel prior statistical theory to obtain an atmospheric background light image in the absolute radiation image and a wide-waveband average atmospheric transmissivity corresponding to two-dimension scene dark channels, (3) refining the average atmospheric transmissivity by using guided filtering, and (4) obtaining the atmospheric transmissivity of a needed wavelength by combining the corresponding relationship of extinction coefficients of visible light with different wavebands and the wide-waveband average atmospheric transmissivity corresponding to two-dimension scene dark channels. The method is simple in devices, can achieve real-time high-precision low-cost measurement, and can be applied for long-distance targets and flying platforms.
Description
Technical field: [0001] The invention relates to the measurement of atmospheric transmittance, belongs to the field of optics, and specifically discloses a method for measuring atmospheric transmittance in the visible light band based on a single-frame color image. Background technique: [0002] Atmospheric transmittance is an important factor affecting radiation transmission and an important parameter for evaluation and correction in related optoelectronic engineering applications. At present, the methods for obtaining atmospheric transmittance are mainly based on numerical model calculations, and limited measurement methods are limited to specific scenarios, and their application range is limited. [0003] The early calculation method of atmospheric transmittance is mainly the look-up table method, the main disadvantage is time-consuming and low accuracy. In order to obtain high-precision atmospheric transmittance, a method of calculating atmospheric transmittance using e...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/61G06T7/00
CPCG01N21/61G06T7/0002G06T2207/10004G06T2207/10024
Inventor 武鹏飞郑鑫饶瑞中魏合理朱文越黄宏华
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI