Color calibration method of camera module

[0032]Taking the setting of RGB values, SPD (λ)×R (λ), brightness of each color sample and a Canon EOS 650D three-channel RGB camera as an example, the flowchart is as shown in FIG. 1, and the specific steps are as follows:

1) adopting a 24-color X-Rite ColorChecker Classic color chart as shown in FIG. 2;

[0033]2) adopting officially provided RGB values of each color sample in the standard color chart as reference parameter values; meanwhile, adopting the multiplication result of spectral power distribution SPD (λ) of standard daylight D65 defined by International Commission on illumination and officially provided spectral reflectance R (λ) of each color sample of the standard color chart as SPD (λ)×R (λ) (as shown in FIG. 3 and FIG. 4); setting the brightness of each color sample;

3) reproducing the SPD (λ)×R (λ) and the brightness of each color sample through a spectral tunable lighting source;

4) sequentially photographing the each reproduced SPD (λ)×R (λ) and brightness of each color s

[0034]Taking obtaining RGB values of each color sample of a Canon EOS 650D three-channel RGB camera through photographing and measurement and obtaining the SPD (λ)×R (λ) and the brightness of each color sample through measurement as an example, the flowchart is as shown in FIG. 9, and the specific steps are as follows:

1) adopting a 24-color X-Rite ColorChecker Classic standard color chart;

[0035]2) as shown in FIG. 10, laying the color chart in the standard lighting cabinet using 0 / 45 geometry with daylight D50, photographing the color chart through a Canon EOS 650D single-lens reflex camera (f-number 5.6, exposure time 1 / 60 and ISO100), and obtaining the preference RGB values of each color sample in the color chart after processing; meanwhile, directly measuring the SPD (λ) (the spectral power distribution of the standard lighting cabinet D50)×R (λ) (the spectral reflectance) and the brightness of the color sample with a spectroradiometer (as shown in FIG. 11), wherein the measured