Dynamic backlight control method

Abstract

The invention provides a dynamic backlight control method, which comprises the following steps: a set gray value as the boundary value, the video image pixel that is more than the gray value in a current frame is counted generally, and a one-way statistical vector Hn(i) of the video image pixel is formed, wherein i is equal to 0-(N-1), and N is any natural number within the numeric area of the video gray; a first statistical proper value h1(n) and a second statistical proper value h2(n) of the video image pixel are obtained according to the one-way statistical vector, a preset threshold and apreset complementation threshold; that whether the scene switch is carried out or not is judged according to the first statistical proper value h1(n) and the second statistical proper value h2(n) of the video image pixel, the weight value of IIR filtration is adjusted according to the judging result, and then the self-adaptation IIR filtration can be implemented on the first proper value, so as toobtain the filtration result f(n); and the backlight attenuation and the data gain can be adjusted according to the video image of the filtration result f(n).

Description

technical field [0001] The invention relates to the field of digital display, in particular to a dynamic backlight control method. Background technique [0002] At present, such as LCD TVs, PC (Personal Computer) monitors, notebook computer display panels, and other various large, medium and small terminal display devices (such as MP3, MP4, PMP (Protable Media Player, Portable Multimedia Player), PDA (Personal Digital Assistant, personal digital assistant), PSP (PlayStation Protable,), smart phone, etc.), can adaptively and synchronously adjust the backlight brightness and image data according to the video image content. [0003] The flow chart of the existing Dynamic Backlight Control (Dynamic Backlight Control, DBC for short) method is as follows figure 1 shown. First, the gray value distribution histogram (histogram, such as figure 2 Shown) statistics, the statistical process is more complicated; then, from the histogram, calculate the average gray value M of the stat...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a dynamic backlight control method, which can solve the problem that the inventor found that in the dynamic backlight control method of the prior art, the histogram statistics are two-way statistics, which makes the calculation process more complicated. The gray value M or the most frequently occurring gray value F as the statistical feature value cannot well adapt to the energy distribution characteristics of the image, and it is prone to the problem of large-scale highlight oversaturation, and the maximum gray value Max is used as the statistical feature value to save energy. The effect is limited. At the same time, the performance of FIR filtering is greatly affected by the order, and a large number of filter coefficients need to be stored, resulting in a large amount of calculation.

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