Method for dynamically adjusting backlight brightness based on image content

Abstract

The invention discloses a method for dynamically adjusting backlight brightness based on the image content. The method can dynamically adjust a backlight and adjust the image contrast effectively. The method includes the following steps: (1) calculating the gray level histogram of an image to be used for calculating the highest degree of distortion and the largest gain coefficient of the image; (2) limiting the maximum value of the gain coefficient to reduce the influences that the display effect is weakened and a user feels uncomfortable in vision, wherein the influences are caused by sudden change of the backlight; (3) according to the ambient brightness, determining the minimum value of the current brightness of a mobile phone to determine the current maximum distortion so that the situation that the user is unable to recognize the content on a screen because the environment is too bright will not happen; (4) introducing an image similarity algorithm of a historical frame and a current frame to reduce the number of times of calculation of the gain coefficient. The method dynamically adjusts the backlight according to the display content on the screen, reduces calculation amount to the greatest extent under the condition that the effect of the calculation amount on the performance of the mobile phone is taken into consideration, compensates for the caused image distortion, and ensures that the visual experience of the user will not be affected by the design of low power consumption.

Description

technical field [0001] The invention relates to the research field of digital signal processing, in particular to a method for dynamically adjusting backlight brightness based on image content. Background technique [0002] As the functions of smartphones become more and more powerful, the resulting power consumption is gradually increasing. However, what users want to experience is not only strong computing performance and rich applications, but also long-lasting battery life is a key evaluation criterion for a mobile phone, so low power consumption design is a problem that many developers and designers must face. In the entire mobile phone system, the power consumption of the display module accounts for 50% to 60%, and image display is an indispensable and important part of human-computer interaction. Therefore, how to reduce the power consumption of the display module is the top priority of the low power consumption design of the mobile phone. Nowadays, the display scre...

AI Technical Summary

Problems solved by technology

[0003] At present, among various technologies that involve adjusting the brightness of the backlight to reduce power consumption, the static setting is the main method, which has the following disadvantages: (1) After reducing the brightness of the backlight, the image display quality is reduced, which seriously affects the user's visual experience

(2) The brightness of the backlight cannot be dynamically adjusted in real time according to the display content, so that the optimal backlight reduction cannot be obtained, and the balance between display effect and power consumption can be achieved

(3) After reducing the brightness of the backlight, image algorithm processing such as brightness compensation cannot be performed on the display content to compensate for the image distortion caused by reducing the brightness of the backlight

(4) The screen energy-saving and distortion compensation algorithm does not respond well to the ambient brightness to adjust the response, resulting in a greatly reduced screen display effect when the ambient brightness is strong

(5) The brightness mutation problem caused by the change of screen brightness brings discomfort to the user's eyes

Images