采样方向对中药饮片横切面图像纹理特征参数的影响

目的：考察采样方向对中药饮片横切面图像纹理特征参数的影响。方法：选取4种形状及纹理特征各异的中药饮片，分别采集其完整和不完整饮片在旋转不同角度后得到的图像，并基于灰度共生矩阵和灰度梯度共生矩阵提取图像的26个纹理特征参数。通过分析26个纹理特征参数变化曲线图的变化趋势和变化幅度等差异，探讨不同采集方向对图像纹理特征参数的影响。结果：当中药饮片为完整饮片时，其切面图像的26个纹理特征参数不受采样方向的影响；当饮片样本不完整时，其切面图像的26个纹理特征参数受采样方向的影响，而且饮片形状越不规则产生的影响越大。结论：对于不同形状及纹理特征的中药饮片进行图像采集时考虑采样方向对纹理特征参数的影响，为获得高质量的中药饮片采集图像提供了保障，也为基于纹理特征参数的判别模型建立奠定了基础。

Impact of Rotation Sampling on Parameters of Texture Feature in Chinese Herbal Medicine Images

This study was aimed to investigate the impact of rotation sampling on feature parameters of texture images of Chinese herbal medicine. Four Chinese herb medicine with various shape and texture feature were taken as research materials. Images of complete and incomplete herbal medicine were collected respectively after different rotation angles. The 26 parameters were extracted by gray-level co-occurrence matrix and grayscale gradient matrix. The impact of rotation sampling on feature parameters was investigated through analysis of variation tendency and range of 26 parameters. The results showed that if the Chinese herbal medicine was complete, the 26 parameters were not impacted by the rotation angle, whereas the 26 parameters were impacted by the rotation angle and the impact will be more obvious when the shape of Chinese herb medicine was irregular. It was concluded that in order to get a high quality of images and construct a well identification model based on the parameter of texture features, we must consider the impact of rotation angle on the parameters to Chinese herbal medicine with various shapes and texture features.