自动色彩均衡算法的速度优化

Speed optimization automatic color equalization

针对自动色彩均衡(ACE)算法的计算复杂性问题,提出了渐进局部线性查找表(GLLLUT)法的ACE速度优化算法.该算法利用ACE算法的距离加权效应,根据空域滤波计算的距离范围采用不同分辨率缩略处理,在提高速度的同时有效控制缩略计算的总体误差.实验验证和效果分析结果表明,所提出的ACE速度优化算法具有与局部线性查找表(LLLUT)加速算法相近的良好速度性能,但具有更好的校正效果,加速所产生的误差较小且几乎不随图像尺寸变化,适合高分辨率图像处理的需要.

Aimed at the problem of computational complexity of automatic color equalization （ACE） meth- od, a gradual local linear look up table （GLLLUT）technique is proposed. Based on the idea of distance- weighted effect of ACE, the optimized method uses multi-resolution thumbnail processing in accordance with the distance range of spatial filtering. Thereby, it can improve the speed as well as effectively control the overall error oI thumbnail calculation. Experiments confirmed that the proposed method not only has similar speed performance as local linear look up table （LLLUT）method, but also better correction result that the error causes by speed optimization hardly changes with the increase of the size oF the image. It means that the proposed method can fit the need of high resolution image processing.