为了在降低液晶显示器背光功耗的同时能够保持图像质量,提出了基于分层色调映射的LED背光调制算法.利用低通滤波对图像进行分层,通过亮度对数映射函数把低频部分映射到低动态范围,再与增益后的高频部分相结合为输出图像.将输出图像最大灰阶能够增加的数值作为LED背光因子降低值,采用动态背光缩放技术,降低背光强度值,并提高液晶透光率,对其亮度进行补偿.仿真实验结果表明,采用这种方法,在失真率为4.8%时,可节省功耗15.0%;在失真率为15.6%时,可节省功耗34.0%.
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