Fig. 1. Schematic of GBRG in RAW format

Fig. 2. ROI exposure control diagram.(a) ROI area selection under scene 1, ① relatively low brightness area, ② relatively high brightness area; (b) ROI area selection under scene 2, ① relatively low brightness area, ② relatively high brightness area

Fig. 3. Schematic diagrams of luminance statistics within the ROI. (a) Chunked statistics subregion luminance and weight coefficients; (b) subregion weight distribution

Fig. 4. Schematic diagram of linear variation of convergence step size

Fig. 5. Schematic of the nonlinear variation of the convergence step size

Fig. 6. Exposure control flow diagram

Fig. 7. Schematic diagram of experimental platform

Fig. 8. Comparison of exposure results under scene 1. (a) Original exposure; (b) ROI exposure based on relatively dark areas; (c) ROI exposure based on relatively bright areas

Fig. 9. Comparison of exposure results under scene 2. (a) Original exposure; (b) ROI exposure based on relatively dark areas. (c) ROI exposure based on relatively bright areas

Fig. 10. Schematic diagrams of the exposure convergence process. (a) Initial exposure state; (b) exposure adjustment for the first frame; (c) second frame; (d) third frame exposure convergence