Fig. 1. Schematic diagram of on-board radiation calibration optical path based on solar-diffuser

Fig. 2. Normalized results of the DN values of the integrating sphere and the on-board solar diffuser

Fig. 3. Data processing. (a) Normalized results of the calibration data on board after flat field processing; (b) relative calibration coefficients of the pixels of the CCD detector

Fig. 4. Ocean scene images. (a) Raw image; (b) image after calibrated by histogram matching method; (c) image after calibrated based on diffuse plate method

Fig. 5. Gobi desert scene images. (a) Raw image; (b) image after calibrated by histogram matching method; (c) image after calibrated based on diffuse plate method

Fig. 6. Cloud scene images. (a) Raw image; (b) image after calibrated by histogram matching method; (c) image after calibrated based on diffuse plate method

Fig. 7. Mean value of each pixel column direction of the ocean scene image before and after relative calibration

Fig. 8. Mean value of each pixel column direction of the Gobi desert scene image before and after relative calibration

Fig. 9. Mean value of each pixel column direction of the cloud scene image before and after relative calibration

Fig. 10. Streaking metrics statistics of ocean scene image before and after relative calibration. (a) Raw image; (b) image after calibrated by histogram matching method and image after calibrated based on diffuse plate method

Fig. 11. Streaking metrics statistics of Gobi desert scene image before and after relative calibration. (a) Raw image; (b) image after calibrated by histogram matching method and diffuse plate method

Fig. 12. Streaking metrics statistics of cloud scene image before and after relative calibration. (a) Raw image; (b) image after calibrated by histogram matching method and diffuse plate method