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在介绍原理的基础上,首先分析了相机曝光对高质量鱼眼照片获取的影响,提出了一种野外操作可行的最佳曝光参数设置方法:将曝光量相对林下自动曝光量调低两步,即固定光圈,把快门速度相对林下自动曝光速度调快两步。随后分析了鱼眼照片3个波段对天空—树叶分类乃至孔隙率和LAI计算的影响,提出了鱼眼照片处理的基本流程,该流程主要要求选择蓝波段图像进行分析和利用0~60°天顶角范围内的图像参与LAI计算。通过对青海云杉林LAI多仪器同步观测实验对比证明:用提出的曝光方法和数据处理流程得到的LAI与LAI-2000测值基本相当,具有很好的应用前景。
Based on the principle of introduction, firstly, the effect of camera exposure on the acquisition of high-quality fish-eye images was analyzed. A method of setting the optimal exposure parameters for field operation was proposed: the exposure was reduced by two steps , That is fixed aperture, the shutter speed relative to the forest automatic exposure speed two steps. Then, the effects of three bands of fisheye on sky classification, porosity and LAI calculation are analyzed. The basic process of fisheye photo processing is proposed. The process mainly requires the selection of blue band images for analysis and utilization of 0-60 days Images in the vertex range participate in LAI calculations. By comparing the LAI multi-instrument observation experiment of Picea crassifolia forest in Qinghai Province, it is proved that LAI and LAI-2000 measured by the proposed exposure method and data processing flow are basically equivalent and have good application prospects.