Color correction method for RGB-IR (Infrared) image sensor based on infrared environment
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An image sensor, RGB-IR technology, applied in the fields of home security, mobile vehicle, home intelligence, and security, can solve the problems of low controllability, complicated correction methods, cumbersome steps, etc., and achieve good adaptability and controllability High performance and simple steps
Inactive Publication Date: 2017-03-08
杭州雄迈集成电路技术股份有限公司
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[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
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Embodiment 1
[0044] Such as Figure 4 Shown, the color correction method of the RGB-IR image sensor under multi-infrared environment, it comprises the following steps:
[0045] The D65 light source and the A light source are respectively irradiated in areas A and B, and the RGB-IR image sensor is matched with a bimodal filter to capture the color cards placed in areas A and B;
[0046] Perform linear interpolation on the original image of the RGB-IR image sensor response, and calculate the pixel values of the four channels of the image, as the R of formula 1 0 , G 0 , B 0 、IR 0 . where R 0 , G 0 , B 0 is the superposition of visible light component and infrared light component of each channel, IR 0 It is the superposition of multiple infrared components (this embodiment lists the environment of two infrared components, but the method is not limited to the environment of two infrared components, and may be more than two). i.e. R 0 =R+IR 0 , G 0 =G+IR 0 , B 0 =B+IR 0 、IR 0 ...
Embodiment 2
[0051] Such as Figure 5 Shown, the color correction method of the RGB-IR image sensor under the single infrared environment, it comprises the following steps:
[0052] The D65 light source (not limited to D65 light source, but also applicable to any monochrome light source) illuminates the area where the color card is placed, and the RGB-IR image sensor is matched with a double-peak filter to capture the color card of the area illuminated by the D65 light source;
[0053] Perform linear interpolation on the original image of the RGB-IR image sensor response, and calculate the pixel values of the four channels of the image, as the R of formula 1 0 , G 0 , B 0 、IR 0 . where R 0 , G 0 , B 0 is the superposition of visible light component and infrared light component of each channel, IR 0 is an infrared component. i.e. R 0 =R+IR 0 , G 0 =G+IR 0 , B 0 =B+IR 0 . where IR 0 is the pixel's response to the infrared component of the D65 light source;
[0054] Formul...
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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...
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