Design of Adaptive Video Image Dehazing Algorithm and FPGA Accelerated Implementation
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摘要: 该文提出了一种自适应图像去雾算法，充分考虑不同复杂场景下的图像特征，建立了算法的自适应机制。该机制包含对图像是否有雾、是否为天空区域、滤波器尺寸等的自适应调整，解决了传统图像去雾算法在深度断层处可能产生的光晕效应等问题。该文同时对上述自适应图像去雾算法进行FPGA加速实现，实验结果表明，该文算法在XC7K325T型号FPGA视频处理平台上可以满足对1080P@60Hz视频去雾的实时性要求。对于大多数轻雾或浓雾场景，该文算法去雾后图像色彩自然无过饱和，全局对比度和饱和度提升比率均值为0.309和0.994，相比于本领域其他去雾算法优势明显。Abstract: This paper proposes an adaptive image dehazing algorithm, which fully considers the image features in different complex scenes and establishes an adaptive mechanism of the algorithm. The mechanism includes adaptive adjustments to whether the image is foggy, whether it is a sky area, or filter size, etc., which solves the bad effect that the traditional algorithm may cause when dehazing the depth mutation region. This article also implements FPGA acceleration for the adaptive image dehazing algorithm. Experimental results show that the algorithm can meet the real-time requirements of 1080P@60Hz video dehazing on XC7K325T FPGA video processing platform. For most light fog or heavy fog scenes, the image color of this algorithm is naturally free of oversaturation after dehazing. The average global contrast and saturation enhancement ratio are 0.309 and 0.994, which has obvious advantages compared with other dehazing algorithms in the field.
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Key words:
- Video dehaze /
- Adaptive mechanism /
- Real-time dehaze /
- Implementation on FPGA
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表 1 自适应图像去雾算法的有雾与否判定
图片种类 测试数量 判定需要去雾 判定无需去雾 准确率(%) 无雾图 50 1 49 98 薄雾图 50 46 4 92 浓雾图 50 49 1 98 总体 150 ╲ ╲ 96 
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