It is known that step-down response of CCD’s part pixels

impact of high-energy particles and absorbed cosmic dust in space camera can all induce the black stripes for the camera image. For the camera in orbit for a long time

the image quality is seriously affected. By researching for the pre-launch calibration data

an algorithm based on the least square method and radiance retrieval was proposed to renormalize the image in orbit

which could make the black stripes in the image be effectively eliminated. Firstly

the gray levels of CCD pixels under different irradiation grades were collected

and the relation between the average gray level of all pixels and the corresponding irradiation values was established by the least square method

then the correction index of each pixel was worked out

and thus the correction index of the black stripes’ corresponding pixels could be obtained by analyzing the laboratory radiometric calibration coefficients. Lastly

the real gray levels of the black strips were computed by the correction index matrix. The experiment results show that for the modified images

the black stripes can be removed effectively and the image quality is satisfactory.