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    基于小波与曲波遗传融合的木材纹理分类

    Wood board texture classification based on genetic fusion of wavelet and curvelet features.

    • 摘要: 针对木材表面存在的直纹、抛物纹与乱纹3 类纹理,提出一种快速、准确的分类方法。分别提取小波变换的 15 个特征与曲波变换的16 个特征,通过设计纹理类型的遗传网络分类器,遗传优选出14 个主要特征;最后,运用 BP 网络构建基于优选特征量的纹理分类器。对3 类300 个样本进行了仿真实验,基于小波变换、曲波变换和遗传 融合方法的平均分类准确率分别为86.5%、89.3%和90.9%,平均分类时间分别为0.025、0.563 和0.216 s。实验 结果表明:小波变换对直纹分类具有较好的分类效果,但缺少方向性,对复杂纹理分类精度低;曲波变换可用于表 达复杂的木材纹理特征,但特征计算时间较长;基于遗传融合的特征提取方法,融合了小波分类速度快与曲波分类 精度高的特点,实现了小波与曲波的特征有效选择,提高了纹理分类的速度与分类精度。

       

      Abstract: Because of existing texture patterns such as straight, parabolic and chaotic, this paper proposes a fast and accurate classification method. First, 15 features from wavelet and 16 features from curvelet transform were extracted. Then, a genetic network was designed, whose inputs represent 31 features and outputs represent 3 texture patterns. After genetic operation, 14 features were optimized. Finally, texture classification was constructed based on BP network using the optimized features. Tests were conducted for 300 samples, categorized into three types. The average classification rates of the wavelet, the curvelet and the fusion methods were 86.5%, 89.3% and 90.9%, respectively. The classification times were 0.025, 0.563 and 0.216 seconds. Experimental results showed that wavelet transform had good classification for straight textures, but struggles with complex textures lack of direction. Curvelet transform can be used to express the complex texture of wood, but the computational time for its features is long. The genetic fusion method combines the fast classification of wavelet and the high accuracy of curvelet by extracting the effective features for classification.

       

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