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为了提高 CMOS 图像传感器校准光源色温、亮度和色品坐标的准确度和调节精度，同时能够使色品坐标独立可调，提出了一种采用低色温白光 LED 灯珠、高色温白光 LED 灯珠加红绿蓝光 LED 灯珠组合式调光方法的校准光源，并研制了光源控制系统及调光软件。用户通过调光软件输入目标色温值和照度值，光源控制板会根据设定值选择相应的 LED 灯珠组合并输出对应的色温值和照度值的光源。实验结果表明，LED 光源实际输出色温和照度值相对于设定值的偏差范围在 1%以内。在色温输入值不变的情况下，调节照度值时对色温的影响在 0.2%以内，能够实现色温和照度独立可调。脉冲宽度调制（PWM）输出频率为21KHz，LED 光源在 CMOS 图像传感器检测下无频闪。色品坐标 yx),( 独立可调，调整精度达到 0.0001。色温在长时间工作下变动范围在 0.05%以内，照度在长时间工作下变动范围在 0.1%以内，LED 光源稳定性良好。
In order to improve the accuracy and accuracy of CMOS image sensor calibration of color temperature, brightness and chromaticity coordinate, and to make the chromaticity coordinate independently adjustable, a method of using low color temperature white LED lamp beads and high color temperature white LED lamp beads plus Red, green and blue LED lamp beads combined dimming method of calibration light source, and developed a light source control system and dimming software. The user inputs the target color temperature value and illuminance value through the dimming software, and the light source control panel will select the corresponding LED lamp bead combination and output the light source with the corresponding color temperature value and illuminance value according to the set value. The experimental results show that the deviation of the actual output color temperature and illuminance value of LED light source from the set value is within 1%. Under the condition that the color temperature input value is unchanged, the influence on the color temperature when adjusting the illuminance value is within 0.2%, and the color temperature and the illuminance can be independently adjusted. Pulse width modulation (PWM) output frequency of 21KHz, LED light source in the CMOS image sensor detection without strobe. Chromaticity coordinates yx), (independently adjustable, the adjustment accuracy of 0.0001. Color temperature in the long-term work under the range of variation within 0.05%, the illumination in a long time working under the fluctuation range of less than 0.1%, LED light source stability is good.