采用圖像直方圖特征函數(shù)的高速相機(jī)自動(dòng)曝光方法
[Abstract]:An automatic exposure method using image histogram feature (Histogram Feature,HF) function is proposed, which is used to control the automatic exposure of high speed camera under the condition of fast background illumination and wide range variation. Firstly, the region of interest (Region of Interests,ROIs) is extracted by multipoint photometry to reduce the computational complexity of the system. Then, the exposure time is coarse adjusted by calculating the HF function of the region of interest. Finally, the fine step length of exposure time is calculated by fuzzy logic, and the variable step size is used to search for the best exposure time by using threshold limit, which improves the accuracy and stability of automatic exposure of high speed camera. The experimental results show that this method can measure the brightness of a frame of image in 2ms and adjust the exposure time. Compared with the traditional automatic exposure method based on average luminance value, in 0~110ms, the illumination intensity of the light source changes from 760,23 100lux. The entropy of image information obtained by this method is 48.38 higher than that of the average brightness value method, and the variance is reduced by 62.13 points, which can provide better and more stable image detail information for subsequent automatic focusing. Image recognition and target tracking provide reference.
【作者單位】: 中國科學(xué)院長春光學(xué)精密機(jī)械與物理研究所;中國科學(xué)院大學(xué);
【基金】:國家863高技術(shù)研究發(fā)展計(jì)劃資助項(xiàng)目(No.2011AA8082035)
【分類號】:TP391.41
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