均匀路径中图像退化光学模型广泛应用于大气中退化图像的复原，而对于斜程观测情况，视线路径中的光照和光学性质是非均匀的, 即使在水平路径中也会面临不均匀的状况。从平面平行大气辐射传输理论出发，建立了非均匀路径中图像退化光学模型，并在典型大气、观测条件下对模型进行了仿真分析。结果表明，对于近水平观测，非均匀路径退化模型简化为均匀路径中的退化模型；当观测距离较小时，两个模型在表达形式上是一致的，并且相对于长波段，短波段更满足此结论；不同观测方向和太阳的方位角差对退化模型的影响只在于观测处背景光的不同；此外，退化模型依赖于近地面水平能见度。

The optical model of image degradation in homogeneous path is widely used in restoration of degraded image in atmosphere. However, when observing in slant path, the illumination and optical characteristic are inhomogeneous in the path of sight. This also occurs even though in horizontal path. The optical model of image degradation in inhomogeneous path is founded based on radiative transfer theory of the parallel plane atmosphere, and the simulation analysis on the model under typical atmospheric and observing conditions is performed. From the results, the degradation model in inhomogeneous path is reduced to the model in homogeneous path when observing near horizontally. While the observing distance is short, the two models are consistent in expression form. And compared with longer wavelengths, the conclusion is better satisfied at shorter wavelengths. The effect of different azimuthal angle differences on degradation model lies only in the difference of background skylight in the position of observer. In addition, the degradation model depends on the near-ground horizontal visibility.