CMOS圖像傳感器校準用可調(diào)光源
本文選題:光學(xué)器件 + 校準光源; 參考:《光學(xué)學(xué)報》2017年03期
【摘要】:為了提高CMOS圖像傳感器校準光源色溫、亮度和色品坐標(biāo)的準確度和調(diào)節(jié)精度,同時能夠使色品坐標(biāo)獨立可調(diào),提出了一種采用低色溫白光LED燈珠、高色溫白光LED燈珠加紅綠藍光LED燈珠組合式調(diào)光方法的校準光源,并研制了光源控制系統(tǒng)及調(diào)光軟件。用戶通過調(diào)光軟件輸入目標(biāo)色溫值和照度值,光源控制板會根據(jù)設(shè)定值選擇相應(yīng)的LED燈珠組合并輸出對應(yīng)色溫值和照度值的光源。實驗結(jié)果表明,LED光源實際輸出色溫和照度值相對于設(shè)定值的偏差范圍在1%以內(nèi)。在色溫輸入值不變的情況下,調(diào)節(jié)照度值時色溫的變化在0.2%以內(nèi),色溫和照度獨立可調(diào)。脈沖寬度調(diào)制輸出頻率為21kHz,LED光源在CMOS圖像傳感器檢測下無頻閃。色品坐標(biāo)獨立可調(diào),調(diào)整精度達到10~(-4)。色溫和照度在長時間工作條件下變動范圍分別在0.05%以內(nèi)和0.1%以內(nèi),LED光源穩(wěn)定性良好。
[Abstract]:In order to improve the accuracy and accuracy of color temperature, brightness and coordinate of color products calibrated by CMOS image sensor, and to make the coordinates of color products adjustable independently, a low color temperature white light LED lamp bead is proposed. The calibration light source of high color temperature white LED lamp bead and red green blue LED light ball combined dimming method is developed. The light source control system and dimming software are developed. The user inputs the target color temperature value and illuminance value through dimming software, the light source control board selects the corresponding LED lamp bead combination according to the set value and outputs the light source corresponding color temperature value and illuminance value. The experimental results show that the deviation range between the actual output color temperature and illuminance value of LED light source and the set value is less than 1%. Under the condition that the input value of color temperature is constant, the change of color temperature is within 0.2% when the illuminance value is adjusted, and the color mild illumination can be adjusted independently. The output frequency of pulse width modulation is 21 kHz / h LED light source without stroboscopic under the detection of CMOS image sensor. The coordinates of color products can be adjusted independently. The range of color and illuminance varies within 0.05% and 0.1% respectively under the condition of long working hours, and the stability of LED light source is good.
【作者單位】: 上海理工大學(xué)出版印刷與藝術(shù)設(shè)計學(xué)院;
【基金】:上海市地方院校能力建設(shè)項目(14440502600)
【分類號】:TP212
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