Liquid crystal display area dynamic dimming method based on image saliency ranking model

The invention discloses a liquid crystal display area dynamic dimming method based on an image saliency ranking model. The liquid crystal display area dynamic dimming method comprises the following steps of 1, obtaining an initial backlight value of each backlight subarea of an input image; predicting saliency scores of different saliency objects in the input image by adopting an instance-level saliency ranking detection model based on graph reasoning, and performing saliency ranking to obtain a saliency ranking graph; 2, dividing the saliency ranking graph obtained in the step 1 into a plurality of backlight partitions according to the number of partitions of backlight sources, endowing the backlight partitions where each saliency object is located with different weights according to the saliency ranking, and then performing weighted calculation correction on the initial backlight value according to the weights to obtain a final partition backlight value; and step 3, simulating distribution of partition back