Fig. 1. Schematic diagram of the wide-angle imaging optical system

Fig. 2. Imaging process of the cloud camera

Fig. 3. Calibration of the relative radiance. (a) Diagram; (b) scene picture

Fig. 4. Diagram of the sub-field of view of response test of cloud camera. (a) Center of the integrating sphere radiation source is imaged on the edge of the image; (b) center of the integrating sphere radiation source is imaged on the center of the image

Fig. 5. Schematic of sub-field of view division of partition combination method

Fig. 6. Response results of the cloud camera after sub-field splicing. (a) R channel; (b) B channel

Fig. 7. Relative radiation response coefficient of the cloud camera in a full field of view. (a) R channel; (b) B channel

Fig. 8. Comparison of the cloud camera image before and after correction. (a) Case 1; (b) case 2; (3) case 3

Fig. 9. Comparison of the cloud camera image of outfield experimentation before and after correction. (a) R channel before correction; (b) R channel after correction; (c) B channel before correction; (d) B channel after correction

Fig. 10. Cross-sectional images of cloud camera R channel outfield image before and after correction. (a) 475th row in the center of the image; (b) 824th column in the center of the image; (c) average of all columns; (d) average of all rows

Fig. 11. Cross-sectional images of cloud camera B channel outfield image before and after correction. (a) 475th row in the center of the image; (b) 824th column in the center of the image; (c) average of all columns; (d) average of all rows