4.3.1. Subjective Experiment

The comparison of image display quality under the target backlight and the optimal backlight is shown in Figure 9.

The images were taken by an optical recorder. Obviously, the image recorders can hardly reproduce the visual perception of eyes. However, we can still distinguish that the visual perception of the optimal backlight is more vivid than that of the target backlight. For clarity, the detail with obvious difference is marked. In the above two images in Figure 9, we observe that the dark areas are enhanced under optimal backlight to improve CR of the displayed image. In the other two images, the marked areas illustrate a higher color saturation to improve display quality under optimal backlight. These demonstrate that the proposed backlight extraction method has stronger adaption in an image with different brightness and rich details in the real display.

**Figure 9.** Display effects with target backlight and optimal backlight: (**a**) target backlight; and (**b**) optimal backlight.
