Color correction method for RGB-IR (Infrared) image sensor based on infrared environment

Abstract

The invention provides a color correction method for an RGB-IR image sensor based on an infrared environment. The method comprises the following steps: step 1), inputting an RGB-IR image from the RGB-IR image sensor, performing interpolation processing on the RGB-IR image, calculating and obtaining numerical values of RGB channels and IR channels at each pixel location, and obtaining full format RGB and IR images; step 2), subtracting numerical values of the IR channels at corresponding positions from the numerical values of R, G, and B channels, obtaining a numerical value of a practical RGB channel at each pixel location, and then obtaining an RGB channel value whose infrared components are filtered; and step 3), performing WB (White Balance) color temperature and CCM (Color Correction Matrix) color correction on the R, G and B channels of step 2), and outputting a corrected RGB image. The color correction method for the RGB-IR image sensor based on the infrared environment provided by the invention has the advantages that the influence of multiple infrared components on the RGB channels can be eliminated in real time without using an IR-CUT, and the influence of the color temperature and color of visible lights on the RGB channels can be corrected; the infrared components can be separated in real time through a direct calculation method, and a correction matrix is not needed to be calculated complicatedly, thus the steps are more concise, the controllability is higher, and the adaptability of the infrared environment is better.

Description

technical field [0001] The invention relates to an image color correction method, in particular to a color correction method based on an RGB-IR image sensor in a multi-infrared environment, which can be applied to security, mobile vehicle, home security, home intelligence and other technical fields. Background technique [0002] In order to achieve 24-hour surveillance video for security monitoring, it is necessary to use infrared supplementary light to realize night vision technology when the ambient illumination is low, and it is necessary to eliminate the influence of infrared light on the RGB channel when the ambient illumination is sufficient. One method widely used in the industry is to build a set of dual filter switchers (IR-CUT) in the camera lens group. IR-CUT switches the filter depending on the change of light. In the environment with strong light, the infrared cut filter is automatically turned on, and the infrared light is filtered out from the incident light t...

AI Technical Summary

Problems solved by technology

[0006] There is a method for simultaneously correcting the color temperature and color change of infrared components and visible light in the prior art, but it cannot correct multiple infrared components in real time, and the correction method is complicated and has the disadvantages of low controllability

[0007] Chinese patent application CN103686111A discloses "a color correction method and device based on an RGBIR image sensor". Although the correction method realizes the function of color correction to a certain extent, it is a method of calculating the correction matrix, and the steps are cumbersome. The adaptability of the environment is poor, and it is basically impossible to correct multiple infrared components at the same time

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