Image quality optimization method based on local dimming, apparatus, and computer readable storage medium

An image display apparatus, wherein the image display apparatus comprises a memory, a processor, and an image quality optimization program based on local dimming stored in the memory and executable by the processor, when the image quality optimization program based on local dimming is executed by the processor, the following steps are carried out:

• based on an input image signal, calculating a PWM duty cycle of a current image signal corresponding to each of backlight regions;
• comparing a preset first PWM duty cycle and a preset second PWM duty cycle with each PWM duty cycle of the current image signal corresponding to each of the backlight regions to determine whether there exists a high backlight region and a low backlight region in the backlight regions;
• in determining that there exists the high backlight region and the low backlight region, decreasing a PWM duty cycle of the low backlight region to decrease an output current to the low backlight region, and increasing a PWM duty cycle of the high backlight region to increase an output current to the high backlight region, thereby increasing a contrast of the current image signal.

A computer readable storage medium storing an image quality optimization program based on local dimming, wherein, when the image quality optimization program based on local dimming is executed by a processor, the following steps are carried out:

• based on an input image signal, calculating a PWM duty cycle of the image signal corresponding to each of backlight regions;
• comparing a preset first PWM duty cycle and a preset second PWM duty cycle with each PWM duty cycle of the current image signal corresponding to each of the backlight regions to determine whether there exists a high backlight region and a low backlight region in the backlight regions;
• in determining that there exists the high backlight region and the low backlight region, decreasing a PWM duty cycle of the low backlight region to decrease an output current to the low backlight region, and increasing a PWM duty cycle of the high backlight region to increase an output current to the high backlight region, thereby increasing a contrast of the image signal.