Method for estimating synthetic spectral sensitivity of narrow-band multi-spectral camera

Abstract

The invention discloses a method for estimating synthetic spectral sensitivity of a narrow-band multi-spectral camera. The method comprises the following steps: using the multi-spectral camera to shoot a multi-spectral image of a standard color card under an ambient light source, keeping the position of the multi-spectral camera unchanged, placing a calibration whiteboard at the standard color card, and shooting a multi-spectral image of the calibration whiteboard and using the multi-spectral image of the calibration whiteboard to correct a multi-channel response value of the standard color card; using a spectrophotometer to measure the spectral reflectance of the standard color card; and using singular value decomposition to calculate a unitary matrix and a singular value matrix of a spectral reflectance matrix composed of all color blocks, and calculating the synthetic spectral sensitivity of the multi-spectral camera in combination with the multi-channel response value calibrated bythe standard color card and a non-negative restricted condition. According to the method for estimating the synthetic spectral sensitivity of the narrow-band multi-spectral camera provided by the invention, the influence of noises on estimating the synthetic spectral sensitivity is reduced, actual physical characteristics of a narrow-band multi-spectral camera channel are considered, and a non-negative restriction calculation condition is added, so that the estimation effect of the synthetic spectral sensitivity of the narrow-band multi-spectral camera is improved.

Description

technical field [0001] The present invention relates to the technical field of acquisition methods for spectral response characteristics of camera sensors, in particular to a method for estimating the synthetic spectral sensitivity of narrow-band multi-spectral cameras that can reduce the influence of noise on the estimated synthetic spectral sensitivity and improve the estimation effect of narrow-band multi-spectral camera synthetic spectral sensitivity Methods. Background technique [0002] Multispectral imaging systems are usually used in fields that require high computational accuracy, but their devices are complex and expensive, and they consume a lot of manpower and material resources when conducting some tentative and exploratory research experiments. Obtaining the spectral sensitivity of the multi-spectral camera sensor can be used for simulation experiments, which can provide prior guidance for actual experiments. On the one hand, it can avoid blind exploration in e...

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Problems solved by technology

[0003] The spectral sensitivity of multispectral camera sensors can be measured, but requires more sophisticated and expensive instruments, and the measurement process is complex and time-consuming

At the same time, the response value of the multispectral camera is not only related to the spectral sensitivity of the sensor, but also affected by the spectral radiation characteristics of the light source, the optical characteristics of the optical path, and the spectral transmission characteristics of the color filter. These factors also need to be considered in the simulation experiment. These characteristics need to be measured by corresponding instruments, which increases the difficulty of the simulation experiment, and the response value of the multispectral camera is not a simple integral of the spectral characteristics of the light source, optical path, color filter and sensor, but is also affected by the design of each part of the device. Tectonic influence

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