针对现有图像去雾算法采用局部先验理论求解的透射率精度不高、复原含雾图像能见度较低的问题
提出了一种雾霾线求解透射率的二次优化方法。首先通过雾霾线先验理论对透射率进行粗估计;然后结合粗估计与最小通道求解的透射率
代入新的可靠性函数进行计算
修正数值较低的像素
完成一次优化
保留边缘信息的同时减少噪点数量;最后
利用纹理区域相对总变分正则项的输出差异
使模型自适应滤除纹理信息
进一步提升透射率估计精度
完成二次优化
有效改善含雾图像能见度。实验结果表明
与目前主流去雾算法相比
所提方法提高了浓雾及景深突变区域的复原图像质量
在主观评价更加清晰的前提下
客观评价指标雾霾感知密度、平均梯度、信息熵和模糊系数分别平均提升了10%
10.16%
0.98%和22.93%。
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