Fig. 1. Flowchart of local dimming algorithm based on image local characteristics

Fig. 2. Layer separation diagram

Fig. 3. Flow chart of threshold evaluation

Fig. 4. S curve

Fig. 5. Relationship of a and S curves

Fig. 6. Original images

Fig. 7. Comparison of the processing effects of different algorithms for architectural images（the red rectangular frame is a partial enlarged view）

Fig. 8. Comparison of the processing effects of different algorithms for character images(the red rectangular frame is a partial enlarged view)

Fig. 9. Comparison of the processing effects of different algorithms for landscape images(the red rectangular frame is a partial enlarged view)