：Targeting negative effects such as clarity and contrast degradation and color distortion of images acquired in hazy weather，underwater，and in nighttime environments，a two-stage image restoration meth• od using an improved atmospheric scattering model is proposed. A global compensation coefficient is intro• duced into the traditional atmospheric scattering model to obtain an improved atmospheric scattering mod• el；the two-stage image restoration method based on this model consists of two stages. First，a degraded image is fed to the improved atmospheric scattering model to obtain a coarse restored image. The gray• scale world algorithm is then used to determine the albedo of this coarse restored image. Second，the albe• do and output image of the first stage are fed to the improved atmospheric scattering model to obtain the fi• nal restored image. Experimental results indicate that the proposed method can avoid the problems of color 文章编号 1004-924X (2022)18-2267-13 收稿日期： 2022-04-21； 修订日期： 2022-06-02. 基金项目： 国家自然科学基金项目(No. 61705127， No. U2033218) 第 30 卷 光学 精密工程 distortion and dark tones in the restored images and has good applicability. The method can effectively achieve image dehazing，underwater image restoration，and night image enhancement. The proposed method achieves excellent results in both quantitative and qualitative experiments compared with state-ofthe-art methods.