Rapid area backlight adjusting method for interlaced scanning video

Abstract

The invention relates to a rapid area backlight adjusting method for an interlaced scanning video. For each image of an interlaced scanning video sequence, a deinterlacing algorithm is utilized to carry out interpolation to acquire a reconstruction image; if an original image of the reconstruction image is an odd field image, the reconstruction image is divided into blocks; sparsity processing on each block is carried out to acquire a pixel data set containing the information amount greater than a set value of the block; gray processing on the acquired pixel data set is carried out; for the data set after gray processing, a subinterval maximum between-class variance method is utilized to acquire a backlight value of each block; smooth operation for the backlight value of each block is carried out to acquire a backlight value after smooth processing; the backlight value is utilized to carry out area backlight adjustment, and liquid crystal compensation is further carried out; if the original image of the reconstruction image is an even field image, the reconstruction image acquired on the basis of an odd field is directly utilized, the backlight value after backlight smooth processing is acquired, and liquid crystal compensation is further carried out. The method is advantaged in that backlight energy consumption is greatly reduced, and video quality is guaranteed.

Description

technical field [0001] The invention relates to a method for adjusting a regional backlight. In particular, it relates to a method for quickly adjusting area backlight for interlaced video. Background technique [0002] At present, most of the backlights used in liquid crystal displays are cold cathode fluorescent lamp (CCFL) backlights. During the entire working period, the CCFL backlight is always in a fully bright state, and consumes a lot of power, accounting for more than 60% of the power consumption of the whole machine. And because the backlight source is always fully bright and does not change brightness with the video signal, the contrast of the image is reduced. In order to solve these problems, LEDs are generally used as backlight sources, and the backlights are dynamically controlled in sub-regions. The main method is to dynamically adjust the brightness of the LEDs according to the content of the images in the sub-regions. [0003] The commonly used regional ...

AI Technical Summary

Problems solved by technology

However, when there are many partitions and the image resolution is large, the complexity of these algorithms is relatively high, so it is difficult to control the backlight in real time. In addition, most of the video sources targeted by these algorithms are for progressive scan video sources, less consideration Interlaced video source

At present, mainstream TV broadcasting systems such as NTSC, PAL, and SECAM usually use interlaced scanning to process video signals during video signal transmission, which involves the issue of how to play interlaced video on displays with regional backlight adjustment functions.

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