光学深度 meaning in English

optical density
optical depth

Fist , black pixel whose radiance is zero is chosen mutually , then image optical depth is computed , at last image information is recovered , two images which * this work is supported by the major project of science and technology research of ministry of education of china under grant no : 01113 are taken in different degree of fog are processed by difference image information amplification
对单深度图像的处理，则采用人机交互方式选取辐射黑点，后根据大气模型进行处理的方法，求取图像的光学深度，进而利用模型处理的方法恢复图像的信息。对变雾况的两幅同一场景的图像，采用差图像放大的方法，提高图像的清晰度并给出了理论证明。