It is shown that the geometrical optics model can not be used to describe the object-image transformation of Gaussian beam through the lens under the general case.
结果表明，在一般情况下，几何光学模型不能描述高斯光束经这种透镜的物像变换。
The method uses the Anscombe's transformation to adjust the original image to a Gaussian noise model.
改进后的方法使用方差不变性变换来调整原始图像为高斯噪声模型。
Next, vegetation index was calculated which was based on Band 3 and Band 4 of TM image, and degree of vegetation coverage was extracted according to NDVI based on the transformation model;
其次，利用TM影像的第四和第三波段计算植被指数，根据植被指数按照转换模型提取植被覆盖度；
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