CAJ | 학술논문

分析某型Bayer阵列彩色宽幅面阵航空相机的成像过程，结合Bayer阵列成像原理，提出相机成像均匀性的各个影响因素。采用实验室内辐射标定的方法获得相机暗电流噪声及像元响应度的测量数据，响应度测量结果表明，在工作谱段范围内，当输出值未达到饱和时，相机各色彩通道像元的响应度曲线接近线性变化，但像面边缘区域的像元响应度较中心区域明显降低。以响应度最高的红色通道为基准，获得等能量输入时各色彩通道的归一化色彩平衡系数，结合各像元响应特性，提出基于辐射亮度反演和等能量色彩平衡系数的非均匀性校正方法，并对相机航空成像图像进行了非均匀性校正，均值、方差及梯度等统计结果表明，校正后图像各个区域各个色彩通道的灰度均值差异明显减小，尤其是红色通道，其左下区域标准方差比由0．2015降低到0．0761，说明图像整体亮度更均衡，色调更均匀，校正后图像各个色彩通道的平均梯度较原始图像有所提高，说明校正后图像细节信息更加丰富。
분석모형Bayer진렬채색관폭면진항공상궤적성상과정，결합Bayer진렬성상원리，제출상궤성상균균성적각개영향인소。채용실험실내복사표정적방법획득상궤암전류조성급상원향응도적측량수거，향응도측량결과표명，재공작보단범위내，당수출치미체도포화시，상궤각색채통도상원적향응도곡선접근선성변화，단상면변연구역적상원향응도교중심구역명현강저。이향응도최고적홍색통도위기준，획득등능량수입시각색채통도적귀일화색채평형계수，결합각상원향응특성，제출기우복사량도반연화등능량색채평형계수적비균균성교정방법，병대상궤항공성상도상진행료비균균성교정，균치、방차급제도등통계결과표명，교정후도상각개구역각개색채통도적회도균치차이명현감소，우기시홍색통도，기좌하구역표준방차비유0．2015강저도0．0761，설명도상정체량도경균형，색조경균균，교정후도상각개색채통도적평균제도교원시도상유소제고，설명교정후도상세절신식경가봉부。
Based on Bayer array wide format color aerial camera , imaging process of the camera is analyzed , and combined with the imaging principle of Bayer array , all kinds of factors which affect the non-uniformity of the camera are presented.The detection and measurement of the dark current noise and the pixel response are completed through the radiometric calibration in laboratory .The measurement results of responsivity indicate that in unsaturated state , the radiometric response characteristics of each pixel for each color channel vary linearly in working spectral range , but the responsivity of pixel in the edge region is significantly lower than the central area .The R channel with the maximum absolute spectral sensitivity is chosen as the reference channel , and the normalized color balance coefficient is acquired for each color channel.Combined with the distribution of each pixel response characteristics , non-uni-formity correction method is proposed based on the radiation brightness inversion and equal-energy color balance coef-ficient, and the aerial image is corrected.The statistical results of mean, variance and gradient show that the differ-ence of mean gray of each area and each color channel for corrected image are significantly reduced , especial for the red channel.The standard deviation ratio on left lower area is decreased from 0.201 5 to 0.076 1, the overall image brightness is more balanced , and color is more uniform .Compared to the original image , the average gradient of each color channel is improved , and it shows that the detail information of corrected image is more abundant .