为提高二维对象的形状描述识别精度,本文提出基于F直方图的形状全方向顺序特征描述方法。该方法在全方向上通过方向线对形状进行分割,计算各方向线上对象分割段之间的顺序特征描述量,构建形状的全方向顺序特征描述量,计算形状间的相似...为提高二维对象的形状描述识别精度,本文提出基于F直方图的形状全方向顺序特征描述方法。该方法在全方向上通过方向线对形状进行分割,计算各方向线上对象分割段之间的顺序特征描述量,构建形状的全方向顺序特征描述量,计算形状间的相似度。通过地物形状数据集、MPEG-7 CE-1 Part B形状数据集和瑞典叶子数据集对本方法进行了检索识别性能测试,并和其他形状相似性描述方法进行了对比。实验结果表明,本方法具有更高的检索准确率。形状全方向顺序特征描述方法将形状的边界和区域信息融合,可以准确描述形状的全局特征与局部特征,具有平移、旋转、尺度不变性,具有较强的形状描述识别能力。展开更多
A new simple approach to effectively detect QRS-T complexes in ECG curve is described, so as to easily get the P-wave (when AF does not happen) or the f-wave (when AF happens). By means of signal processing techniques...A new simple approach to effectively detect QRS-T complexes in ECG curve is described, so as to easily get the P-wave (when AF does not happen) or the f-wave (when AF happens). By means of signal processing techniques such as the power spectrum function,the auto-correlation function and cross-correlation function, two kinds of ECG signal when AF does or does not happen were successively analyzed, showing the evident differences between them.展开更多
文摘为提高二维对象的形状描述识别精度,本文提出基于F直方图的形状全方向顺序特征描述方法。该方法在全方向上通过方向线对形状进行分割,计算各方向线上对象分割段之间的顺序特征描述量,构建形状的全方向顺序特征描述量,计算形状间的相似度。通过地物形状数据集、MPEG-7 CE-1 Part B形状数据集和瑞典叶子数据集对本方法进行了检索识别性能测试,并和其他形状相似性描述方法进行了对比。实验结果表明,本方法具有更高的检索准确率。形状全方向顺序特征描述方法将形状的边界和区域信息融合,可以准确描述形状的全局特征与局部特征,具有平移、旋转、尺度不变性,具有较强的形状描述识别能力。
文摘A new simple approach to effectively detect QRS-T complexes in ECG curve is described, so as to easily get the P-wave (when AF does not happen) or the f-wave (when AF happens). By means of signal processing techniques such as the power spectrum function,the auto-correlation function and cross-correlation function, two kinds of ECG signal when AF does or does not happen were successively analyzed, showing the evident differences between them.
