To remove components, such as fog, from a captured image while suppressing a reduction in image quality. An image processing apparatus includes a unit configured to derive parameters for image quality improving processing based on the transmittance of light incident on each pixel of captured image data including a fine particle component and a unit configured to generate corrected image data of the captured image data by performing image quality improving processing to improve image quality of the captured image data using the parameters and removal processing to remove the fine particle component from the captured image data on the captured image data.